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Coastal dunes as drivers of genetic differentiation in the honeypot ant Myrmecocystus baja (Formicidae: Formicinae). 沿海沙丘是蜜罐蚁 Myrmecocystus baja(蚁科:蚁属)遗传分化的驱动因素。
IF 2.1 3区 生物学 Q2 MULTIDISCIPLINARY SCIENCES Pub Date : 2024-07-15 DOI: 10.1007/s00114-024-01925-5
F Sara Ceccarelli, Le Roy A Sankey Alamilla

Coastal dunes are unique habitats, threatened by human activities. In biogeographical terms, coastal dunes are habitat islands, being discrete and distinct patches of similar habitat among themselves, separated from each other by a different type of habitat. Furthermore, coastal dunes harbor endemic species, adapted to living solely in the habitats found on specific dune systems. For example, the honeypot ant Myrmecocystus baja is endemic and restricted to coastal dunes of Mexico's Baja California Pacific coast. This ecological and biogeographical scenario led to the questions whether their geographical isolation is reflected in their genetic diversity and structuring, and how their demographic history is related with the formation of the dune system habitats. To answer these questions, population genetic, isolation-with-migration, and phylogeographical analyses were carried out, based on mitochondrial and five nuclear intronic markers. Minimal gene flow was detected only between two of the dune systems sampled; otherwise, the M. baja populations were found to be isolated and genetically structured, and their divergence generally pre-dated the modern-day dune systems. It is therefore highly likely that these ants were already present in paleodunes and that each of the populations was established from founder populations as the dunes formed. These findings highlight the importance of coastal dunes for species such as the honeypot ant from Baja California, in promoting genetic differentiation.

沿海沙丘是独特的生境,受到人类活动的威胁。从生物地理学的角度看,沿海沙丘是栖息地岛屿,它们之间是不连续的、独特的类似栖息地斑块,彼此被不同类型的栖息地分隔开来。此外,沿海沙丘还蕴藏着特有物种,它们只适应在特定沙丘系统的生境中生活。例如,蜜罐蚁(Myrmecocystus baja)是墨西哥下加利福尼亚太平洋沿岸沙丘的特有物种。这种生态和生物地理学上的情况导致了这样的问题:它们的地理隔离是否反映在它们的遗传多样性和结构上,以及它们的种群历史与沙丘系统栖息地的形成有什么关系。为了回答这些问题,研究人员根据线粒体和五个核内含子标记进行了种群遗传分析、迁移隔离分析和系统地理学分析。仅在两个取样沙丘系统之间发现了极少量的基因流动;除此之外,巴哈蝠鲼种群被发现是孤立的,具有遗传结构,其分化一般早于现代沙丘系统。因此,这些蚂蚁很可能已经出现在古沙丘中,而且每个种群都是在沙丘形成时由始祖种群建立起来的。这些发现凸显了沿海沙丘在促进遗传分化方面对诸如下加利福尼亚蜜罐蚁等物种的重要性。
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引用次数: 0
Spatial Distribution, Contamination Characteristics, and Potential Ecological Risk Assessment of Trace Metals in Surface Soils of South-Central Stretch Of India 印度中南部地表土壤中痕量金属的空间分布、污染特征和潜在生态风险评估
IF 2.52 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-13 DOI: 10.1007/s11270-024-07344-6
Narsimha Adimalla, Yanyan Gao, Zhen Wang, Hui Qian

Surface soils in urban regions play a crucial role in controlling regional climatic patterns and sustaining ecological equilibrium. This study evaluates the contamination status, distribution patterns and ecological risks of trace metals (TMs) in the soil. Twenty-two sets of surface soils were collected and analyzed using X-ray fluorescence spectrometry, to estimate the levels of TMs, including As, Ba, Co, Cr, Cu, Ni, Pb, Rb, Sr, V, Y, and Zn. The study reveals a high degree of spatial variability in the distribution of TMs, attributable to the influence of various contamination sources. Simultaneously, descriptive statistical analyses unveil that contents of Cu, V, Co, Ni, Cr, Ba, Y, Zn and Sr in the soils were higher than the local background values. Furthermore, most of the surface soil sampling demonstrated moderate to heavily pollution with a few indicating light pollution. The northern, north-western and central parts in the surveyed zone, particularly in the vicinity of Kabelmal, Naimatabad, and Waddi County, were found to be heavily contaminated. The presence of As, Pb, and Zn was primarily influenced by anthropogenic sources, including agricultural and traffic emissions, while Cr and Y were mainly due to industrial emissions. In addition, Ni, Cr and Co were largely attributed to human activities. This provides fundamental information on TMs in surface soils and underscores the necessity for long-term monitoring to safeguard soil and environmental health.

城市地区的表层土壤在控制区域气候模式和维持生态平衡方面发挥着至关重要的作用。本研究评估了土壤中痕量金属(TMs)的污染状况、分布模式和生态风险。研究人员采集了 22 组地表土壤,并使用 X 射线荧光光谱法进行分析,以估算土壤中的痕量金属含量,包括砷、钡、钴、铬、铜、镍、铅、铷、锶、钒、钇和锌。研究显示,由于受到各种污染源的影响,放射性同位素的分布存在很大的空间差异。同时,描述性统计分析显示,土壤中铜、钒、钴、镍、铬、钡、镍、锌和锶的含量高于当地背景值。此外,大部分表层土壤采样显示为中度到重度污染,少数显示为轻度污染。调查区的北部、西北部和中部地区,尤其是卡布尔马尔、奈马塔巴德和瓦迪县附近,被发现受到严重污染。砷、铅和锌的存在主要受人为来源(包括农业和交通排放)的影响,而铬和镍则主要来自工业排放。此外,镍、铬和钴在很大程度上归因于人类活动。这提供了有关表层土壤中痕量元素的基本信息,并强调了长期监测以保护土壤和环境健康的必要性。
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引用次数: 0
Cytogenotoxicity of 2,4-D and Glyphosate Herbicides: Effects of Isolated and Combined Environmental Concentrations on Onion Root Tips (Allium Cepa) 2,4-D 和草甘膦除草剂的细胞遗传毒性:环境浓度对洋葱根尖(Allium Cepa)的单独和组合影响
IF 2.52 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-13 DOI: 10.1007/s11270-024-07282-3
Tatiana da Silva Souza, Gabriele Bitencourt Tavares, Victor Ventura de Souza

Glyphosate and 2,4-dichlorophenoxyacetic acid (2,4-D) are the most widely used pesticides in the world. In this work, the cytogenotoxic potential of these herbicides and their binary mixtures was investigated using A. cepa test. 2,4-D was assayed at 0.4 – 400 μg L−1 and glyphosate at 0.65 – 650 μg L−1 concentration range. The concentrations evaluated cover those permitted by Brazilian legislation for the protection of aquatic life and human health. Sixteen binary mixtures were examined to replicate different contamination scenarios. When analyzed separately, 2,4-D at 400 μg L−1 inhibited the mitotic index, while glyphosate at 0.65 and 65 μg L−1 increased it. In addition, the herbicides increased the frequency of chromosomal aberrations (2,4-D at 0.4, 4, and 40 μg L−1 and glyphosate at 0.65, 65, and 650 μg L−1) and micronuclei (2,4-D at 400 μg L−1 and glyphosate at 650 μg L−1). Regarding the mixtures, six of them were cytotoxic while eight were genotoxic. Additive, synergistic, or potentiated effects were observed. However, none of the mixtures tested increased the frequency of micronuclei. The results showed that even concentrations allowed by Brazilian legislation pose a potential risk to exposed organisms. There is little research on the cytogenotoxic effects of 2,4-D + glyphosate mixtures, so this is the first study to analyze a large number of combinations. The detection of additive, synergistic, or potentiated toxicities highlights the need for better pesticide legislation and discussions among regulators and environmental managers regarding pesticide mixtures in water.

草甘膦和 2,4-二氯苯氧乙酸(2,4-D)是世界上使用最广泛的农药。在这项工作中,我们利用牛肝菌试验研究了这些除草剂及其二元混合物的细胞遗传毒性潜力。2,4-D 的检测浓度为 0.4 - 400 μg L-1,草甘膦的检测浓度为 0.65 - 650 μg L-1。所评估的浓度涵盖了巴西立法所允许的保护水生生物和人类健康的浓度。研究了 16 种二元混合物,以复制不同的污染情况。在单独分析时,400 μg L-1 的 2,4-D 会抑制有丝分裂指数,而 0.65 和 65 μg L-1 的草甘膦会提高有丝分裂指数。此外,除草剂增加了染色体畸变的频率(0.4、4 和 40 μg L-1 的 2,4-D 和 0.65、65 和 650 μg L-1 的草甘膦)和微核的频率(400 μg L-1 的 2,4-D 和 650 μg L-1 的草甘膦)。关于混合物,其中六种具有细胞毒性,八种具有基因毒性。观察到了叠加效应、协同效应或增效效应。不过,所测试的混合物都没有增加微核的频率。结果表明,即使是巴西法律允许的浓度,也会对暴露生物造成潜在风险。关于 2,4-D + 草甘膦混合物的细胞遗传毒性效应的研究很少,因此这是首次对大量混合物进行分析的研究。检测到的添加、协同或增效毒性突出表明,有必要完善农药立法,并在监管机构和环境管理者之间就水中的农药混合物展开讨论。
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引用次数: 0
Passivation Performance and Mechanism of a Novel Self-Healing Composite Passivator on Pyrite 新型自愈合复合钝化剂在黄铁矿上的钝化性能与机理
IF 8.131 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1039/d4en00404c
Weifeng Wu, Mengke Li, Jiang Tian, Feng Li, Yun Liu
Acid mine drainage (AMD) is a harmful effluent from mining activities. Surface passivation technology can prevent AMD production by coating minerals with passivation films. Previous study reported a composite passivator comprising γ-mercaptopropyltrimethoxysilane (PropS-SH) and halloysite loaded with benzotriazole (BTA). However, two issues persist in this work: the organosilane-based passivator requires passivating pyrite at 50~100 °C, and the encapsulation method for the guest passivator in halloysite is limited. To address these challenges, a novel self-healing composite passivator (PLHP passivator) was synthesized, using PropS-SH and lawsone as the main passivation agents and halloysite loaded with 8-HQ as the nanofillers. Polyelectrolytes were employed as the encapsulant within the nanofillers. The formation of a hydrophobic coating on the PLHP coated pyrite surface was revealed by SEM and contact angle tests. The enhanced oxidation resistance of PLHP coated pyrite over raw pyrite and other coated pyrite was verified by electrochemical measurements and chemical leaching tests. Notably, the PLHP coatings could passivate pyrite at room temperature, exhibiting excellent long-term stability and self-healing ability. Furthermore, the incorporation of polyelectrolytes expanded the application range of guest passivator. This paper provides new insights into overcoming the limitations of organosilane-based passivation and self-healing methods in current technology.
酸性矿井排水(AMD)是采矿活动产生的一种有害废水。表面钝化技术可以通过在矿物表面镀上钝化膜来防止酸性矿井排水的产生。之前的研究报道了一种复合钝化剂,由γ-巯丙基三甲氧基硅烷(PropS-SH)和负载苯并三唑(BTA)的哈洛伊特组成。然而,这项工作仍存在两个问题:有机硅烷基钝化剂需要在 50~100 °C的温度下钝化黄铁矿,而将客体钝化剂封装在哈洛来石中的方法有限。为解决这些难题,研究人员以 PropS-SH 和 lawsone 为主要钝化剂,以含 8-HQ 的哈洛来石为纳米填料,合成了一种新型自修复复合钝化剂(PLHP 钝化剂)。纳米填料中使用了聚电解质作为封装剂。SEM 和接触角测试表明,PLHP 涂层黄铁矿表面形成了疏水涂层。电化学测量和化学浸出试验证实,PLHP 涂层黄铁矿的抗氧化性优于未加工的黄铁矿和其他涂层黄铁矿。值得注意的是,PLHP 涂层可在室温下钝化黄铁矿,表现出优异的长期稳定性和自修复能力。此外,聚电解质的加入扩大了客体钝化剂的应用范围。本文为克服现有技术中基于有机硅的钝化和自修复方法的局限性提供了新的见解。
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引用次数: 0
A design-phase Environmental Safe-and-Sustainable-by-Design Categorization Tool for the Development and Innovation of Nano-enabled Advanced Materials (AdMaCat) 用于纳米先进材料开发与创新的设计阶段环境安全与可持续设计分类工具 (AdMaCat)
IF 8.131 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1039/d4en00068d
Analuisa Rubalcaba Medina, Fernando J. Rodríguez-Macías, Anders Baun, Steffen Foss Hansen
In support of the European Union’s circular economy action plans and its chemical strategy for sustainability, initiatives are being developed aimed at integrating ‘safe and sustainable by design’ (SSbD) principles and approaches in the development of chemicals and materials to promote a toxic-free environment. The expected widespread use of advanced materials (AdMa) underlines the need for addressing sustainability and environmental safety as early as possible in the material design. Here, we present AdMaCat, which is a SSbD first-tier screening categorization tool addressing environmental concerns of AdMa. The tool is aimed at the early design-phase in materials development, to enable a transparent and systematic evaluation of the functionality, safety, and sustainability of AdMa in a circular economy context. AdMaCat delivers a color coded output with design recommendations covering the material life-cycle stages manufacturing, use, and end-of-life. The applicability of AdMaCat is illustrated through a case study on organic aerogels for insulation purposes focusing on material and process selections, application, and waste management options. We conclude that AdMaCat can assist in identifying data gaps and inform decisions regarding the design of tailored AdMa by optimizing the balance of functionality, safety, and sustainability in a circular economy.
为支持欧盟的循环经济行动计划及其化学可持续发展战略,目前正在制定相关倡议,旨在将 "安全和可持续设计"(SSbD)原则和方法纳入化学品和材料的开发中,以促进无毒环境的形成。先进材料(AdMa)的预期广泛使用突出表明,有必要在材料设计中尽早解决可持续性和环境安全问题。在此,我们介绍 AdMaCat,这是一种 SSbD 一级筛选分类工具,用于解决 AdMa 的环境问题。该工具针对材料开发的早期设计阶段,能够在循环经济背景下对 AdMa 的功能性、安全性和可持续性进行透明、系统的评估。AdMaCat 以彩色编码输出设计建议,涵盖材料生命周期的制造、使用和报废阶段。AdMaCat 的适用性通过对用于绝缘目的的有机气凝胶的案例研究加以说明,重点关注材料和工艺选择、应用和废物管理选项。我们的结论是,AdMaCat 可以通过优化循环经济中的功能性、安全性和可持续性之间的平衡,帮助确定数据缺口,并为量身定制的 AdMa 设计提供决策依据。
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引用次数: 0
Outstanding Reviewers for Environmental Science: Nano in 2023 环境科学》杰出评审员:2023 年的纳米
IF 8.131 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1039/d4en90023e
We would like to take this opportunity to thank all of Environmental Science: Nano's reviewers for helping to preserve quality and integrity in chemical science literature. We would also like to highlight the Outstanding Reviewers for Environmental Science: Nano in 2023.
我们想借此机会感谢《环境科学》杂志的所有审稿人,感谢他们帮助保持化学科学文献的质量和完整性:纳米》的审稿人帮助维护了化学科学文献的质量和完整性。我们还想特别提到《环境科学:纳米》的杰出审稿人:2023 年纳米》的杰出审稿人。
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引用次数: 0
Synthesis and characterization of thiazolidinone -functionalized MCM-41 and kaolinite nanocomposites as the powerful and new adsorbents for heavy metal removal: process optimization using RSM-CCD 噻唑烷酮功能化 MCM-41 和高岭石纳米复合材料的合成与表征:利用 RSM-CCD 进行工艺优化的新型强效重金属吸附剂
IF 2.52 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-12 DOI: 10.1007/s11270-024-07310-2
Elham Nazarizadeh, Samieh Fozooni, Esmat Tavakolinejad Kermani, Moj Khaleghi

Core – shell magnetic nanoparticles MCM-41 and nano-clays are working absorbents for elimination of heavy metal ions. Nanoparticles Fe3O4 are made by sol- gel method and are covered by silica and their surfaces are modified with suitable organic compounds. Organic clays also are one of usual absorbents which absorb diverse spectrum of organic pollutants and adsorption function of these compounds is relating to interlayer structure and their surface modification. In present research, for the first time, Kaolinite-NH2@thiazolidinone and Fe3O4@MCM-41-NH2@thiazolidinone nanocomposites were prepared and after structural approval by FTIR, VSM, XRD, SEM, TGA, BET, EDX technics, were used for adsorption of ({mathrm{Pb}}^{2+}) and Cd2+ from aqueous medium as an active absorbent. to urgent elimination and active heavy metal ions in aqueous solutions, MCM-41 and Kaolinite were modified with (3-aminopropyl) trietoxysilane (APTES) and then during a three-step reaction in condition without solvent with thioglycolic acid and benzaldehyde were reacted and finally, thiazolidinone was synthetized on their surfaces. Adsorption process and different conditions of absorbent dose, metal ion concentration, time and pH have been studied. For optimization conditions, method of response surface (RSM) has been used. 120 tests with two synthetic absorbents were performed for adsorption of Pb2+ and Cd2+, which most capacity of adsorption with the use of Fe3O4@MCM-41-NH2@thiazolidinone was 768.25 mg/g in pH = 5 and 341.5 mg/g in pH = 7.5, respectively. Also, results indicated that most capacity of adsorption with the use of Kaolinite-NH2@Thiazolidin for elimination of Pb2+ and Cd2+ were 552.81 mg/g in pH = 6.5 and 393.21 mg/g in pH = 7.5. Effect of pH, time, absorbent dose, and initial concentration of cations lonely and effect of their simultaneously in adsorption capacity and elimination percentage were evaluated.

Graphical Abstract

芯壳磁性纳米粒子 MCM-41 和纳米粘土是消除重金属离子的有效吸收剂。纳米颗粒 Fe3O4 是通过溶胶凝胶法制造的,由二氧化硅覆盖,其表面用适当的有机化合物修饰。有机粘土也是常用的吸附剂之一,可吸附各种有机污染物,这些化合物的吸附功能与层间结构和表面改性有关。本研究首次制备了高岭石-NH2@噻唑烷酮和 Fe3O4@MCM-41-NH2@噻唑烷酮纳米复合材料,并通过傅立叶变换红外光谱(FTIR)、可见光谱(VSM)、XRD、扫描电镜(SEM)、热重分析(TGA)、BET、EDX 等技术对其结构进行验证,将其作为活性吸附剂用于吸附水介质中的({mathrm{Pb}}^{2+}) 和 Cd2+。为了紧急消除水溶液中的活性重金属离子,用(3-氨基丙基)三乙氧基硅烷(APTES)对 MCM-41 和高岭石进行改性,然后在无溶剂条件下与巯基乙醇酸和苯甲醛进行三步反应,最后在它们的表面合成噻唑烷酮。研究了吸附过程以及吸附剂剂量、金属离子浓度、时间和 pH 值等不同条件。在优化条件时,采用了响应面法(RSM)。使用两种合成吸附剂对 Pb2+ 和 Cd2+ 进行了 120 次吸附试验,结果表明,使用 Fe3O4@MCM-41-NH2@thiazolidinone 在 pH = 5 和 pH = 7.5 条件下的吸附容量分别为 768.25 毫克/克和 341.5 毫克/克。结果还表明,使用高岭石-NH2@噻唑啉酮消除 Pb2+ 和 Cd2+ 的吸附容量最大,在 pH = 6.5 时分别为 552.81 mg/g 和 393.21 mg/g。评估了 pH 值、时间、吸附剂剂量和阳离子初始浓度对吸附容量和消除率的影响。
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引用次数: 0
Ashes in Freshwater Ecosystems: A Systematic Review of their Impacts on Fish 淡水生态系统中的灰烬:灰烬对鱼类影响的系统回顾
IF 2.52 4区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Pub Date : 2024-07-12 DOI: 10.1007/s11270-024-07308-w
Gustavo Kirsch, Amanda Gomes Anjos, Renata Ruaro, Nelson Abrantes, Bruno R. S. Figueiredo

Ash runoff into freshwater systems from fire events, coal combustion, and volcanic activities threatens to biodiversity conservation, given its toxicity to various aquatic organisms. However, despite many studies reporting a negative relationship between ash exposure and the biological traits of freshwater fish, non-significant and even positive associations can also be found in the literature. Here, a systematized review was conducted to explore patterns and biases in studies examining the impacts of ash on freshwater fish. Out of the 43 studies included in this review, 38 reported harmful effects of ash exposure on fish traits. The median lowest concentration of ashes capable of inducing negative effects on fish traits was found to be 2 g/L. Diet restrictions (84.6%), behavioral changes (83.3%), cytological and genetic damages (64.7%), and bioaccumulation of toxic compounds (57.1%) exhibited the highest proportions of negative results in statistical evaluations testing ash effects on fish traits. In contrast, biomarkers related to reproduction (94.7%) and metabolism (66.4%) had the highest proportion of non-significant associations between fish traits and ash exposure. Statistical models indicate that the ash source does not determine the direction (positive or negative) of its effect on fish traits. Furthermore, no evidence supports the hypothesis of similar sensitivity levels to ash exposure among phylogenetically closely related fish species. Together, the evidence provides a cohesive perspective on the detrimental effects of ash on fish, highlighting the effective necessity to manage the influx of ash into watercourses.

Graphical Abstract

火灾、煤炭燃烧和火山活动造成的灰烬流入淡水系统,由于其对各种水生生物的毒性,威胁着生物多样性的保护。然而,尽管许多研究报告了灰烬暴露与淡水鱼类生物特征之间的负相关关系,但在文献中也可以发现非显著甚至正相关的关系。在此,我们对有关灰分对淡水鱼类影响的研究进行了系统回顾,以探索研究的模式和偏差。在纳入本次综述的 43 项研究中,有 38 项研究报告了接触灰烬对鱼类特征的有害影响。研究发现,能够对鱼类性状产生负面影响的灰烬最低浓度中位数为 2 克/升。在测试灰烬对鱼类性状影响的统计评估中,饮食限制(84.6%)、行为改变(83.3%)、细胞学和遗传损伤(64.7%)以及有毒化合物的生物累积(57.1%)的负面结果比例最高。相比之下,与繁殖(94.7%)和新陈代谢(66.4%)相关的生物标志物在鱼类性状和灰分暴露之间的非显著关联比例最高。统计模型表明,灰分来源并不决定其对鱼类性状影响的方向(正或负)。此外,没有证据支持系统发育上密切相关的鱼类物种对灰分暴露具有相似敏感度的假设。总之,这些证据提供了一个关于灰烬对鱼类有害影响的统一视角,突出了对灰烬流入河道进行有效管理的必要性。
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引用次数: 0
Enhanced removal of As(III) by manganese-doped defective UiO-66 coupled peroxymonosulfate: multiple reactive oxygen species and system stability 锰掺杂缺陷 UiO-66 耦合过氧单硫酸盐增强对 As(III) 的去除:多种活性氧物种和系统稳定性
IF 8.131 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1039/d4en00194j
Zihao Xie, Qingyun He, Shaobo Liu, Xinyi Huang, Mingyang Dai, Qiang Chen, Ang Sun, Jian Ye, Xiaofei Tan, Weihua Xu
Structurally defective UiO-66 has garnered significant interest due to its remarkable performance in the domains of adsorption and catalysis. In this research, the successful synthesis of Mn-doped defective UiO-66 (Mn1D40UiO-66) was confirmed by XRD and FTIR characterization. More than 95% of As(III) (C0 = 1.1 mg L−1) was removed in 1 h (Ccatalyst = 0.2 g L−1, CPMS = 0.1 mM). Compared with the original UiO-66, when coupled with peroxymonosulfate (PMS), Mn1D40UiO-66 accelerated the generation of reactive oxygen species (ROS), resulting in an increase in As(III) removal efficiency by about 50%. XPS spectra and EXAFS spectra indicated that As(III) adsorbed in the Mn1D40UiO-66/PMS system was fully oxidized to As(V) and the adsorption was attributed to As–O–Zr coordination. Several types of ROS (·OH, SO4˙, and O2˙) generated by PMS activation acted collectively on As(III) oxidation, so a single ROS scavenger did not have a marked inhibitory effect on As(III) removal. In addition, the system maintained efficiency over a broad pH range (3–11), and retained an arsenic removal rate higher than 89.8% even in the presence of high concentrations of several anions (SO42−/Cl/NO3, 10 mM). Meanwhile, 99.3% of the As(III) could be removed by Mn1D40UiO-66 at extremely high humic acid concentrations (100 mg L−1). Due to the excellent stability of the material, only trace amounts of metal leaching were detected (Mn ion ≤ 3 μg L−1) during the whole experiment. The whole oxidation and adsorption process demonstrated excellent anti-interference ability and stability. This study shows the great potential of transition metal doped defective metal–organic frameworks in the field of adsorption and catalysis and provides a novel idea for the high-efficiency management of As(III) pollution in water environments.
结构上有缺陷的 UiO-66 由于在吸附和催化领域的卓越性能而备受关注。本研究通过 XRD 和 FTIR 表征证实了掺锰缺陷 UiO-66 (Mn1D40UiO-66)的成功合成。在 1 小时内,95% 以上的 As(III)(C0 = 1.1 mg L-1)被去除(Ccatalyst = 0.2 g L-1,CPMS = 0.1 mM)。与原来的 UiO-66 相比,Mn1D40UiO-66 与过一硫酸盐 (PMS) 结合使用时,可加速活性氧 (ROS) 的生成,从而使 As(III) 的去除效率提高约 50%。XPS 光谱和 EXAFS 光谱表明,Mn1D40UiO-66/PMS 系统中吸附的 As(III) 被完全氧化为 As(V),吸附作用归因于 As-O-Zr 配位。PMS 活化产生的几种 ROS(-OH、SO4˙- 和 O2˙-)共同作用于 As(III)的氧化,因此单一的 ROS 清除剂对 As(III)的去除没有明显的抑制作用。此外,该系统在较宽的 pH 值范围(3-11)内都能保持高效率,即使在高浓度的几种阴离子(SO42-/Cl-/NO3-,10 mM)存在的情况下,砷去除率也能保持在 89.8%以上。同时,在腐殖酸浓度极高(100 mg L-1)的情况下,Mn1D40UiO-66 可以去除 99.3% 的 As(III)。由于该材料具有极佳的稳定性,在整个实验过程中仅检测到微量的金属浸出(锰离子≤ 3 μg L-1)。整个氧化和吸附过程表现出了卓越的抗干扰能力和稳定性。该研究显示了掺杂过渡金属的缺陷金属有机框架在吸附催化领域的巨大潜力,为高效治理水环境中的 As(III) 污染提供了新思路。
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引用次数: 0
A metal-free photocatalytic active hybrid fiber as a novel self-cleaning adsorbent for enhanced tetracycline removal 一种作为新型自清洁吸附剂的无金属光催化活性杂化纤维,可提高四环素的去除率
IF 8.131 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-07-12 DOI: 10.1039/d4en00387j
Kaijie Ni, Ruiqi Xu, Yanlong Chen, Ming Guo
Metal-free photocatalytic degradation of pollutant is an eco-friendly green method for wastewater remediation. Herein we reported using amine modified alginate as anchor line, graphene oxide (GO) and carbon nanotubes (CNT) as photoactive units to fabricate a recyclable metal-free photocatalytic active hybrid fiber via facile carbodiimine-mediated amide coupling and calcium ion crosslinking. The results show that the photoactive fiber with unique microporosity and enhanced thermal stability has been successfully prepared. The prepared fiber presented a significantly photo-enhanced removal effect on tetracycline (TC). The efficiency of TC removal promoted by the fiber under solar irradiation is 10 times higher than that under dark. In the photocatalytic treatment of TC, the fiber also showed higher TC removal efficiency than that of GO and CNT alone synergistic effect of GO/CNT. Electron spin resonance analysis confirmed that the fiber under solar irradiation induced to the generation of 1O2 and hole (h+) which degraded TC. UV-vis spectra analysis indicated that GO and CNT components in the fiber promoted TC to undergo oxidative degradation. Major transformation products during TC removal were identified with Liquid chromatography mass spectrometry. Finally, such photoactivity of the fiber can be utilized to develop a convenient irradiation/agitation regeneration approach to make the fiber adsorbent reusable. The recycled fiber maintained an excellent level of TC removal performance after multiple recycling steps. Overall, this study provides a new strategy of preparing a recycled metal-free photocatalytic material for water treatment, and is of great reference value for research in this field.
无金属光催化降解污染物是一种环保的绿色废水修复方法。本文报道了以胺修饰的海藻酸盐为锚线,氧化石墨烯(GO)和碳纳米管(CNT)为光活性单元,通过简便的碳化二亚胺介导的酰胺偶联和钙离子交联,制备出一种可回收的无金属光催化活性杂化纤维。结果表明,所制备的光活性纤维具有独特的微孔和更高的热稳定性。所制备的纤维对四环素(TC)具有明显的光增强去除效果。该纤维在太阳光照射下对四环素(TC)的去除效率是黑暗环境下的 10 倍。在光催化处理四环素的过程中,纤维对四环素的去除效率也高于单独使用 GO 和 CNT 的效果。电子自旋共振分析证实,在太阳光照射下,纤维会诱导产生 1O2 和空穴(h+),从而降解 TC。紫外-可见光谱分析表明,纤维中的 GO 和 CNT 成分促进了 TC 的氧化降解。液相色谱质谱法确定了去除 TC 过程中的主要转化产物。最后,纤维的这种光活性可用于开发一种方便的辐照/搅拌再生方法,使纤维吸附剂可重复使用。再生纤维在经过多个再生步骤后,仍能保持出色的三氯乙酸去除性能。总之,本研究为制备用于水处理的再生无金属光催化材料提供了一种新策略,对该领域的研究具有重要的参考价值。
{"title":"A metal-free photocatalytic active hybrid fiber as a novel self-cleaning adsorbent for enhanced tetracycline removal","authors":"Kaijie Ni, Ruiqi Xu, Yanlong Chen, Ming Guo","doi":"10.1039/d4en00387j","DOIUrl":"https://doi.org/10.1039/d4en00387j","url":null,"abstract":"Metal-free photocatalytic degradation of pollutant is an eco-friendly green method for wastewater remediation. Herein we reported using amine modified alginate as anchor line, graphene oxide (GO) and carbon nanotubes (CNT) as photoactive units to fabricate a recyclable metal-free photocatalytic active hybrid fiber via facile carbodiimine-mediated amide coupling and calcium ion crosslinking. The results show that the photoactive fiber with unique microporosity and enhanced thermal stability has been successfully prepared. The prepared fiber presented a significantly photo-enhanced removal effect on tetracycline (TC). The efficiency of TC removal promoted by the fiber under solar irradiation is 10 times higher than that under dark. In the photocatalytic treatment of TC, the fiber also showed higher TC removal efficiency than that of GO and CNT alone synergistic effect of GO/CNT. Electron spin resonance analysis confirmed that the fiber under solar irradiation induced to the generation of <small><sup>1</sup></small>O<small><sub>2</sub></small> and hole (h<small><sup>+</sup></small>) which degraded TC. UV-vis spectra analysis indicated that GO and CNT components in the fiber promoted TC to undergo oxidative degradation. Major transformation products during TC removal were identified with Liquid chromatography mass spectrometry. Finally, such photoactivity of the fiber can be utilized to develop a convenient irradiation/agitation regeneration approach to make the fiber adsorbent reusable. The recycled fiber maintained an excellent level of TC removal performance after multiple recycling steps. Overall, this study provides a new strategy of preparing a recycled metal-free photocatalytic material for water treatment, and is of great reference value for research in this field.","PeriodicalId":73,"journal":{"name":"Environmental Science: Nano","volume":null,"pages":null},"PeriodicalIF":8.131,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141597263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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