Pub Date : 2026-01-01Epub Date: 2025-12-11DOI: 10.1016/j.apt.2025.105148
Santanu Dey, Thomas Tourneur, Axel de Broqueville, Armand Béché, Juray De Wilde
A novel compact radial multizone dryer (RMD) has been tested at the pilot scale. In the radial centre of the chamber, hot air and the atomized solution are injected axially and counter current. In the periphery, mild temperature air is injected through multiple short vortex chambers to generate a rotational motion in the chamber and ensure high-G intensified drying and separation of the produced powder and hot drying air. The RMD allows fast initial drying of the injected droplets with hot air in the radial centre and fast evacuation of the initially dried powder to the periphery for final drying with mild temperature air. First, dry and water evaporation tests were carried out to gain insight in the flow pattern and temperature profile in the chamber. Next, a 4.5 min duration spray drying test was carried out using a 40 % maltodextrin model solution at a solution feed rate of 16.1 g/s. The tests demonstrated the working principle and performance of the RMD. Powder recovery and quality, as well as energy efficiency are discussed.
{"title":"Maltodextrin spray drying in a compact radial multizone dryer – First pilot plant findings","authors":"Santanu Dey, Thomas Tourneur, Axel de Broqueville, Armand Béché, Juray De Wilde","doi":"10.1016/j.apt.2025.105148","DOIUrl":"10.1016/j.apt.2025.105148","url":null,"abstract":"<div><div>A novel compact radial multizone dryer (RMD) has been tested at the pilot scale. In the radial centre of the chamber, hot air and the atomized solution are injected axially and counter current. In the periphery, mild temperature air is injected through multiple short vortex chambers to generate a rotational motion in the chamber and ensure high-G intensified drying and separation of the produced powder and hot drying air. The RMD allows fast initial drying of the injected droplets with hot air in the radial centre and fast evacuation of the initially dried powder to the periphery for final drying with mild temperature air. First, dry and water evaporation tests were carried out to gain insight in the flow pattern and temperature profile in the chamber. Next, a 4.5 min duration spray drying test was carried out using a 40 % maltodextrin model solution at a solution feed rate of 16.1 g/s. The tests demonstrated the working principle and performance of the RMD. Powder recovery and quality, as well as energy efficiency are discussed.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"37 1","pages":"Article 105148"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-12-05DOI: 10.1016/j.apt.2025.105135
Baokai Wang , Ning Luo , Zewen Wang , Chengcheng Ye , Zongwen Fu , Xiaochao Wu , Qingkui Li , Jilin He
In this work, mechanical alloying is used to prepare single-phase W-10Ti alloy powder. The effects of ball milling time on the phase constitution, morphology, particle size, composition, oxygen content and the occurrence state of oxygen of W-10Ti alloy powder are thoroughly studied. The results show that the morphology of particles gradually changes from the irregular polyhedron to the sphere with increasing milling time. The D50 of the powder increases from ∼13.9 µm for initial powder to ∼24.1 µm after 2 h ball milling, and then decreases to ∼6.7 µm after 16 h ball milling. When milling for 8 h, W and Ti achieve a complete solid solution. The application of an excessive ball milling time readily results in a drastic increase in the oxygen content. The oxygen content of the powder increases from 1082.1 ppm for initial powder over 4130.9 ppm after 8 h ball milling to 6343.3 ppm after 16 h ball milling. This work offers critical theoretical insights and technical guidance for the controllable synthesis and characterization of pre-alloyed powders by physical metallurgy methods.
{"title":"Controllable preparation and characterization of single-phase W-10Ti powder for high-performance refractory alloy targets","authors":"Baokai Wang , Ning Luo , Zewen Wang , Chengcheng Ye , Zongwen Fu , Xiaochao Wu , Qingkui Li , Jilin He","doi":"10.1016/j.apt.2025.105135","DOIUrl":"10.1016/j.apt.2025.105135","url":null,"abstract":"<div><div>In this work, mechanical alloying is used to prepare single-phase W-10Ti alloy powder. The effects of ball milling time on the phase constitution, morphology, particle size, composition, oxygen content and the occurrence state of oxygen of W-10Ti alloy powder are thoroughly studied. The results show that the morphology of particles gradually changes from the irregular polyhedron to the sphere with increasing milling time. The <em>D</em><sub>50</sub> of the powder increases from ∼13.9 µm for initial powder to ∼24.1 µm after 2 h ball milling, and then decreases to ∼6.7 µm after 16 h ball milling. When milling for 8 h, W and Ti achieve a complete solid solution. The application of an excessive ball milling time readily results in a drastic increase in the oxygen content. The oxygen content of the powder increases from 1082.1 ppm for initial powder over 4130.9 ppm after 8 h ball milling to 6343.3 ppm after 16 h ball milling. This work offers critical theoretical insights and technical guidance for the controllable synthesis and characterization of pre-alloyed powders by physical metallurgy methods.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"37 1","pages":"Article 105135"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-12-01DOI: 10.1016/j.apt.2025.105124
Yujiao Zhao , Yingnan Han , Cong Zhou , Yan Li , Zhiyu Fang , Lei Xia , Dachuan Lu , Qifeng Jia , Yuheng Gao
As a new approach for large-scale solid waste utilization and carbon sequestration, carbon sequestration backfilling technology requires a clear understanding of slurry pipeline transport characteristics. As an unstable gas-phase component, the influence of CO2 on multiphase flow behavior must be considered. This study establishes a gas–liquid-solid Eulerian model coupled with Population Balance Model (PBM) to characterize CO2 bubble aggregation and reveal how inlet velocity, pipe diameter and residual CO2 content affect slurry flow characteristics. The results show that: (1) Slurry velocity presents an asymmetric distribution (top > bottom), due to multiphase coupling effect- CO2 enrichment at the top forms a gas–liquid lubricating layer to reduce resistance, while gangue particles deposition at the bottom increases resistance; (2) Parameter sensitivity: Increasing inlet velocity increases flow core velocity and pressure drop; Expanding pipe diameter reduces flow core velocity and pressure drop, while intensifying slurry-particle slip; Increasing residual CO2 content reduces pressure drop, slightly inhibits flow core velocity, and exacerbates the flow core offset. This study confirms residual CO2 content, inlet velocity, and pipe diameter as key parameters regulating pipeline transportation performance of carbon sequestration backfill slurry, providing theoretical support for parameter optimization and energy consumption control of slurry transportation system.
{"title":"Effect of residual CO2 on three-phase flow characteristics of carbon sequestration backfill slurry in straight horizontal pipeline","authors":"Yujiao Zhao , Yingnan Han , Cong Zhou , Yan Li , Zhiyu Fang , Lei Xia , Dachuan Lu , Qifeng Jia , Yuheng Gao","doi":"10.1016/j.apt.2025.105124","DOIUrl":"10.1016/j.apt.2025.105124","url":null,"abstract":"<div><div>As a new approach for large-scale solid waste utilization and carbon sequestration, carbon sequestration backfilling technology requires a clear understanding of slurry pipeline transport characteristics. As an unstable gas-phase component, the influence of CO<sub>2</sub> on multiphase flow behavior must be considered. This study establishes a gas–liquid-solid Eulerian model coupled with Population Balance Model (PBM) to characterize CO<sub>2</sub> bubble aggregation and reveal how inlet velocity, pipe diameter and residual CO<sub>2</sub> content affect slurry flow characteristics. The results show that: (1) Slurry velocity presents an asymmetric distribution (top > bottom), due to multiphase coupling effect- CO<sub>2</sub> enrichment at the top forms a gas–liquid lubricating layer to reduce resistance, while gangue particles deposition at the bottom increases resistance; (2) Parameter sensitivity: Increasing inlet velocity increases flow core velocity and pressure drop; Expanding pipe diameter reduces flow core velocity and pressure drop, while intensifying slurry-particle slip; Increasing residual CO<sub>2</sub> content reduces pressure drop, slightly inhibits flow core velocity, and exacerbates the flow core offset. This study confirms residual CO<sub>2</sub> content, inlet velocity, and pipe diameter as key parameters regulating pipeline transportation performance of carbon sequestration backfill slurry, providing theoretical support for parameter optimization and energy consumption control of slurry transportation system.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"37 1","pages":"Article 105124"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-12-23DOI: 10.1016/j.apt.2025.105153
Xiaogang Sun , Yiming Yang , Pengxing Huang , Daitao Kuang , Xiang Li , Xiang Zhang , Xiaomin Peng , Qian Tang , Yi Chen , Zhonghua Huang
Core-shell nanostructures combining magnetic metals with carbon matrices have emerged as promising candidates for high-performance microwave absorption. In this work, we report the facile synthesis of NiMn-C core–shell nanoparticles via a one-step metal–organic chemical vapor deposition method, which enables precise tuning of the Ni/Mn atomic ratio. The as-synthesized nanoparticles, with an average diameter of ∼11 nm, exhibit improved microwave absorption properties, including a minimum reflection loss of −35.5 dB and a broad effective absorption bandwidth of 6.0 GHz at a thin thickness of 2.0 mm. Full-wave radar cross-section simulations, conducted using CST Microwave Studio, further confirm the material’s superior microwave scattering suppression, underscoring its practical stealth utility. Moreover, the NiMn-C absorber maintains its wide effective absorption bandwidth under conditions of low filler loading (16.7 wt%) and lightweight design, demonstrating its potential for electromagnetic interference (EMI) shielding and radar-absorbing applications. This study provides a viable strategy for designing efficient, lightweight microwave absorbers with tunable compositions.
{"title":"Tunable microwave absorption of NiMn-C core–shell nanoparticles via Ni/Mn atomic ratio control","authors":"Xiaogang Sun , Yiming Yang , Pengxing Huang , Daitao Kuang , Xiang Li , Xiang Zhang , Xiaomin Peng , Qian Tang , Yi Chen , Zhonghua Huang","doi":"10.1016/j.apt.2025.105153","DOIUrl":"10.1016/j.apt.2025.105153","url":null,"abstract":"<div><div>Core-shell nanostructures combining magnetic metals with carbon matrices have emerged as promising candidates for high-performance microwave absorption. In this work, we report the facile synthesis of NiMn-C core–shell nanoparticles via a one-step metal–organic chemical vapor deposition method, which enables precise tuning of the Ni/Mn atomic ratio. The as-synthesized nanoparticles, with an average diameter of ∼11 nm, exhibit improved microwave absorption properties, including a minimum reflection loss of −35.5 dB and a broad effective absorption bandwidth of 6.0 GHz at a thin thickness of 2.0 mm. Full-wave radar cross-section simulations, conducted using CST Microwave Studio, further confirm the material’s superior microwave scattering suppression, underscoring its practical stealth utility. Moreover, the NiMn-C absorber maintains its wide effective absorption bandwidth under conditions of low filler loading (16.7 wt%) and lightweight design, demonstrating its potential for electromagnetic interference (EMI) shielding and radar-absorbing applications. This study provides a viable strategy for designing efficient, lightweight microwave absorbers with tunable compositions.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"37 1","pages":"Article 105153"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Iron oxide nanostructures synthesized through green methods have gained significant attention due to their eco-friendly nature, low cost and the possibility to avoid toxic reagents. In this work, we present the green synthesis of Fe2O3 nanoparticles (NPs) using Aloe-vera leaf extract as a natural reducing and stabilizing agent. The as-prepared nanostructures exhibit an amorphous nature, which evolves into a crystalline structure upon thermal annealing. The detailed structural and spectroscopic analyses reveal the coexistence of two iron oxide phases, maghemite (γ-Fe2O3) and hematite (α-Fe2O3), providing valuable insights for the development of strategies to tune the properties of iron oxide nanomaterials for targeted applications. In particular, the crystalline NPs were evaluated as photothermal agents for potential use in light-driven therapeutic applications.
{"title":"Amorphous to crystalline phase transition in iron oxide nanoparticles prepared by Aloe vera assisted green synthesis","authors":"Vincenzina Strano , Vanna Torrisi , Simona Boninelli , Maria Miritello","doi":"10.1016/j.apt.2025.105154","DOIUrl":"10.1016/j.apt.2025.105154","url":null,"abstract":"<div><div>Iron oxide nanostructures synthesized through green methods have gained significant attention due to their eco-friendly nature, low cost and the possibility to avoid toxic reagents. In this work, we present the green synthesis of Fe<sub>2</sub>O<sub>3</sub> nanoparticles (NPs) using <em>Aloe-vera</em> leaf extract as a natural reducing and stabilizing agent. The as-prepared nanostructures exhibit an amorphous nature, which evolves into a crystalline structure upon thermal annealing. The detailed structural and spectroscopic analyses reveal the coexistence of two iron oxide phases, maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) and hematite (α-Fe<sub>2</sub>O<sub>3</sub>), providing valuable insights for the development of strategies to tune the properties of iron oxide nanomaterials for targeted applications. In particular, the crystalline NPs were evaluated as photothermal agents for potential use in light-driven therapeutic applications.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"37 1","pages":"Article 105154"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-27DOI: 10.1016/j.apt.2025.105126
Hang Chen , Sibao Wang , Chenglei Wang , Shilong Wang
Hazardous particle diffusion and deposition during machining within chambers pose critical risks to operational safety. Although structural design offers a promising approach to controlling particle-laden flow, simultaneously reducing deposition and pressure drop while enhancing particle escape efficiency remains a significant challenge, particularly within irregular chambers. Thus, this study focuses on optimizing the trapezoidal chamber geometry to address these conflicting objectives. Specifically, a computational fluid dynamic (CFD)-based surrogate model is developed, achieving high-fidelity prediction across the four-dimensional design space by systematically optimizing its hyperparameters. This enables a multi-objective optimization to map the trade-off landscape, from which a final balanced design is selected using a scenario-based approach. Sensitivity analysis identifies the lower-end width (Xn), horizontal offset (Xm), and trapezoidal height (Xh) as the primary drivers of pressure drop, deposition and escape, respectively. The Pareto-front reveals a vast design space, with specialized configurations reducing particle deposition by up to 78.94%. The selected balanced design concurrently reduces deposition by 19.83% and pressure drop by 15%, while increasing escape efficiency by 9.53%. Lagrangian analysis confirms that the geometry governs particle trajectories by modulating the size and location of recirculation zones. The optimized design also demonstrates robust performance across various inlet velocities and particle sizes.
{"title":"Controlling particle-laden flow in a ventilated trapezoidal chamber via surrogate-based multi-objective optimization","authors":"Hang Chen , Sibao Wang , Chenglei Wang , Shilong Wang","doi":"10.1016/j.apt.2025.105126","DOIUrl":"10.1016/j.apt.2025.105126","url":null,"abstract":"<div><div>Hazardous particle diffusion and deposition during machining within chambers pose critical risks to operational safety. Although structural design offers a promising approach to controlling particle-laden flow, simultaneously reducing deposition and pressure drop while enhancing particle escape efficiency remains a significant challenge, particularly within irregular chambers. Thus, this study focuses on optimizing the trapezoidal chamber geometry to address these conflicting objectives. Specifically, a computational fluid dynamic (CFD)-based surrogate model is developed, achieving high-fidelity prediction across the four-dimensional design space by systematically optimizing its hyperparameters. This enables a multi-objective optimization to map the trade-off landscape, from which a final balanced design is selected using a scenario-based approach. Sensitivity analysis identifies the lower-end width (<em>X<sub>n</sub></em>), horizontal offset (<em>X<sub>m</sub></em>), and trapezoidal height (<em>X<sub>h</sub></em>) as the primary drivers of pressure drop, deposition and escape, respectively. The Pareto-front reveals a vast design space, with specialized configurations reducing particle deposition by up to 78.94%. The selected balanced design concurrently reduces deposition by 19.83% and pressure drop by 15%, while increasing escape efficiency by 9.53%. Lagrangian analysis confirms that the geometry governs particle trajectories by modulating the size and location of recirculation zones. The optimized design also demonstrates robust performance across various inlet velocities and particle sizes.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"37 1","pages":"Article 105126"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145610553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-11-18DOI: 10.1016/j.apt.2025.105117
Huizhe Cao , Ye Jiang , Yuanbo Wang , Haisheng Shi , Jiankai Dong
Reducing oil fume particle emissions during kitchen cooking is crucial for maintaining indoor air quality. This study focused on studying a two-stage ESP in residential kitchens to enhance its capture efficiency of submicron-sized particles. Through simulations, four factors were examined: plate spacing in the dust collection area, length of the dust collection area, dust collection voltage, and inlet wind speed. Based on the influencing factors, the structure optimization and optimization verification experiments of ESP were carried out. The results of the study revealed that by reducing the plate spacing from 6.67 mm to 5 mm, the capture efficiency of partial size particles can be increased by 42.18 %. Additionally, increasing the length of the dust collection area by 20 mm can result in a 13.8 % increase. Furthermore, increasing the dust collection voltage by 1.5 kV can result in a 30.07 % increase. Lastly, reducing the inlet wind speed by 0.7 m/s can lead to a 12.61 % increase in capture efficiency. The optimization results show that the trapezoidal plate improves particle capture efficiency across different particle sizes with changing wind speed. These findings highlight the need to optimize ESP parameters in kitchens to effectively capture submicron oil fumes and improve indoor air quality.
{"title":"A numerical simulation study on the effectiveness of a two-stage electrostatic precipitator in removing residential submicron-sized cooking particles","authors":"Huizhe Cao , Ye Jiang , Yuanbo Wang , Haisheng Shi , Jiankai Dong","doi":"10.1016/j.apt.2025.105117","DOIUrl":"10.1016/j.apt.2025.105117","url":null,"abstract":"<div><div>Reducing oil fume particle emissions during kitchen cooking is crucial for maintaining indoor air quality. This study focused on studying a two-stage ESP in residential kitchens to enhance its capture efficiency of submicron-sized particles. Through simulations, four factors were examined: plate spacing in the dust collection area, length of the dust collection area, dust collection voltage, and inlet wind speed. Based on the influencing factors, the structure optimization and optimization verification experiments of ESP were carried out. The results of the study revealed that by reducing the plate spacing from 6.67 mm to 5 mm, the capture efficiency of partial size particles can be increased by 42.18 %. Additionally, increasing the length of the dust collection area by 20 mm can result in a 13.8 % increase. Furthermore, increasing the dust collection voltage by 1.5 kV can result in a 30.07 % increase. Lastly, reducing the inlet wind speed by 0.7 m/s can lead to a 12.61 % increase in capture efficiency. The optimization results show that the trapezoidal plate improves particle capture efficiency across different particle sizes with changing wind speed. These findings highlight the need to optimize ESP parameters in kitchens to effectively capture submicron oil fumes and improve indoor air quality.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105117"},"PeriodicalIF":4.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145569043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-11-24DOI: 10.1016/j.apt.2025.105129
Tianxiang Ren , Pengyue Xing , Liying Wang , Zhenzhu Cao , Zhengxiang Cheng , Yutong Xiao , Feifei Wang , Erjun Zhao , Shujun Zhang
The wide band gap and rapid recombination of electron-hole pair significantly limit the activity of photocatalyst. Although the polarization in ferroelectric under stress can enhance charge separation, this effect is restricted to polar materials. Overcoming this limitation is a key challenge in designing advanced catalyst capable of converting both light and mechanical energy into chemical energy. In this work, oxygen vacancy has been introduced into centrosymatric NaBi(MoO4)2 (NBMO) nanospheres via a facile annealing treatment, which greatly improved the photocatalytic, flexocatalytic and photo-flexocatalytic performance. The composition with optimal oxygen vacancy concentration (NBMO-5) showed remarkable flexo-photocatalytic activity, which achieved 98.7 % RhB degradation within 8 min, outperforming individual flexocatalysis and photocatalysis by 10-fold and 4-fold, respectively. The outstanding performance is attributed to the synergistic effects of oxygen vacancies and flexoelectric potential, which effectively suppress charge recombination and enhance photocatalytic activity. Active species trapping experiment reveals that •OH and h+ play nearly equally important roles in the flexo-photocatalysis, different from individual photocatalysis and flexocatalysis. Mass spectra analysis indicates that conjugate ring destruction is the dominant pathway during flexo-photocatalytic degradation of RhB by the NBMO-5 catalyst. This work demonstrates that oxygen vacancy is an innovative strategy for engineering centrosymmetric materials to address environmental remediation challenge.
{"title":"Remarkable flexo-photocatalytic organic pollutant degradation by oxygen vacancy engineered nonpolar NaBi(MoO4)2 nanospheres","authors":"Tianxiang Ren , Pengyue Xing , Liying Wang , Zhenzhu Cao , Zhengxiang Cheng , Yutong Xiao , Feifei Wang , Erjun Zhao , Shujun Zhang","doi":"10.1016/j.apt.2025.105129","DOIUrl":"10.1016/j.apt.2025.105129","url":null,"abstract":"<div><div>The wide band gap and rapid recombination of electron-hole pair significantly limit the activity of photocatalyst. Although the polarization in ferroelectric under stress can enhance charge separation, this effect is restricted to polar materials. Overcoming this limitation is a key challenge in designing advanced catalyst capable of converting both light and mechanical energy into chemical energy. In this work, oxygen vacancy has been introduced into centrosymatric NaBi(MoO<sub>4</sub>)<sub>2</sub> (NBMO) nanospheres via a facile annealing treatment, which greatly improved the photocatalytic, flexocatalytic and photo-flexocatalytic performance. The composition with optimal oxygen vacancy concentration (NBMO-5) showed remarkable flexo-photocatalytic activity, which achieved 98.7 % RhB degradation within 8 min, outperforming individual flexocatalysis and photocatalysis by 10-fold and 4-fold, respectively. The outstanding performance is attributed to the synergistic effects of oxygen vacancies and flexoelectric potential, which effectively suppress charge recombination and enhance photocatalytic activity. Active species trapping experiment reveals that •OH and h<sup>+</sup> play nearly equally important roles in the flexo-photocatalysis, different from individual photocatalysis and flexocatalysis. Mass spectra analysis indicates that conjugate ring destruction is the dominant pathway during flexo-photocatalytic degradation of RhB by the NBMO-5 catalyst. This work demonstrates that oxygen vacancy is an innovative strategy for engineering centrosymmetric materials to address environmental remediation challenge.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 12","pages":"Article 105129"},"PeriodicalIF":4.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145615089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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