Environmental Functional Materials最新文献

英文中文

Environmental Functional Materials

Pub Date : 2025-01-01

引用次数: 0

Environmental Functional Materials

Pub Date : 2025-01-01

引用次数: 0

Environmental Functional Materials

Pub Date : 2025-01-01

引用次数: 0

Environmental Functional Materials

Pub Date : 2025-01-01

引用次数: 0

Oxygen vacancy-rich mixed-valence manganese oxide mesoporous nanofiber membranes for the efficient removal of organic micropollutants 富氧空位混价氧化锰介孔纳米纤维膜高效去除有机微污染物

Environmental Functional Materials

Pub Date : 2024-06-01 DOI: 10.1016/j.efmat.2024.12.002

Yiping Su , Gang Li , Yangke Long , Zuotai Zhang

The treatment of mixed wastewater remains a formidable challenge due to the presence of complex organic micropollutants. Singlet oxygen (¹O₂)-based Fenton-like reactions have demonstrated superior degradation activity and stability compared to the conventional treatment methods, primarily owing to their high oxidant utilization efficiency and enhanced resistance to complex water matrices. Herein, the manganese oxides (MnO_x) composite catalysts were synthesized through electrospinning followed by calcination, aiming to facilitate efficient ¹O₂ generation for the treatment of simulated mixed wastewaters (Rhodamine B and 4-chlorophenol). The results from batch experiments indicated that optimizing the composition of MnO_x catalysts significantly enhances their activation capabilities for different oxidants, thereby broadening their applicability in diverse wastewater treatment scenarios. Notably, Mn₃O₄-based catalyst exhibited superior performance in periodate (PI) activation, while Mn₂O₃-based catalyst demonstrated enhanced efficiency in peroxymonosulfate (PMS) activation. Continuous flow reaction tests confirmed that the catalyst composite membrane sustained its stability, minimized metal ion leaching, and maintained its functional integrity over time. Analytical assessments identified ¹O₂ as the predominant reactive oxygen species (ROS) during the activation of both PMS and PI. Moreover, the synergistic effects of surface oxygen vacancies (OVs) and Mn³⁺ ions were found to significantly promote oxidant activation and ¹O₂ production. Density functional theory calculations further revealed that surface OVs facilitate catalyst chemisorption and enhance interfacial electronic transfer. This work presents an innovative approach for the design of MnO_x-based catalysts that operate predominantly via a non-radical pathway, highlighting their potential for effective large-scale degradation of micropollutants.

由于存在复杂的有机微污染物，混合废水的处理仍然是一个艰巨的挑战。与传统的处理方法相比，单重态氧（1O2）类芬顿反应表现出更好的降解活性和稳定性，主要是因为它们具有较高的氧化剂利用效率和对复杂水基质的抵抗力。本文采用静电纺丝-煅烧法制备了锰氧化物（MnOx）复合催化剂，用于模拟混合废水（罗丹明B和4-氯苯酚）的高效生成1O2处理。批量实验结果表明，优化MnOx催化剂的组成可显著提高其对不同氧化剂的活化能力，从而扩大其在不同废水处理场景中的适用性。值得注意的是，mn3o4基催化剂在高碘酸盐（PI）活化方面表现优异，而mn2o3基催化剂在过氧单硫酸盐（PMS）活化方面表现优异。连续流动反应试验证实，该催化剂复合膜长期保持其稳定性，最大限度地减少金属离子浸出，并保持其功能完整性。分析结果表明，在PMS和PI的激活过程中，1O2是主要的活性氧（ROS）。此外，表面氧空位（OVs）和Mn3+离子的协同作用显著促进氧化活化和1O2的产生。密度泛函理论计算进一步表明，表面OVs有利于催化剂的化学吸附，增强了界面电子转移。这项工作提出了一种创新的方法来设计基于mnox的催化剂，该催化剂主要通过非自由基途径起作用，突出了其有效大规模降解微污染物的潜力。

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引用次数: 0

The role of “membrane” in membrane biofilm reactor (MBfR), membrane catalyst-film reactor (MCfR) and electrochemical membrane biofilm reactor (EMBfR): Mini review “膜”在膜生物反应器（MBfR）、膜催化-膜反应器（MCfR）和电化学膜生物反应器（EMBfR）中的作用综述

Environmental Functional Materials

Pub Date : 2024-06-01 DOI: 10.1016/j.efmat.2024.12.001

Zhiye Sun , Zhaoshun Zhan , Lixin Li , Zhurui Shen

The wastewater treatment field introduces a groundbreaking technology known as the membrane biofilm reactor (MBfR), leveraging the principle of counter-diffusion between electron donors and acceptors within the biofilm. Within this system, a hydrophobic gas transfer membrane fulfills dual functions: serving as both a surface for biofilm attachment and a source of gas supply, thereby playing a pivotal role. Specially, the membrane catalyst-film reactor (MCfR) and electrochemical membrane biofilm reactor (EMBfR) systems derived from MBfR, enhancing the degradation of contaminants by catalytic and electrochemical processes, respectively. Prior research has predominantly focused on aspects such as pollutant removal efficiency, biofilm characteristics and microbial community composition. Conversely, there has been limited exploration into the membrane's unique properties. Consequently, this review aims to consolidate findings on the characteristics and functional modifications of membrane utilized in MBfR, MCfR and EMBfR systems, addressing the gap in existing literature concerning the “membrane” functional role in membrane reactor reviews.

废水处理领域引入了一种突破性的技术，称为膜生物膜反应器（MBfR），利用生物膜内电子供体和受体之间的反扩散原理。在这个系统中，疏水气体传递膜实现了双重功能：既是生物膜附着的表面，也是气体供应的来源，因此发挥了关键作用。特别是由MBfR衍生而来的膜催化-膜反应器（MCfR）和电化学膜生物膜反应器（EMBfR）系统，分别通过催化和电化学过程增强了对污染物的降解。以往的研究主要集中在污染物去除效率、生物膜特性和微生物群落组成等方面。相反，对膜的独特性质的探索有限。因此，本文旨在整合MBfR、MCfR和EMBfR系统中膜的特性和功能修饰的研究结果，解决现有文献中关于“膜”在膜反应器评价中的功能作用的空白。

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引用次数: 0

CO2 capture and conversion into valuable chemicals using graphitic carbon nitride: A review 氮化石墨碳捕集和转化为有价化学品的研究进展

Environmental Functional Materials

Pub Date : 2024-06-01 DOI: 10.1016/j.efmat.2024.10.001

Mahmoud N. Almakhadmeh , Mohamed N. Almubarak , Sagheer A. Onaizi

Carbon dioxide emission to the atmosphere are the main cause of global warming and the accompanying climate change. Accordingly, effective approaches have to be developed/implemented to tackle CO₂ emission and, ideally, reverse its negative consequences. Recently, graphitic carbon nitride (i.e., GCN or g-C₃N₄) has emerged as attractive material for CO₂ capture and conversion. However, recent, comprehensive reviews on the performance of g-C₃N₄ in the capture and conversion of CO₂ are still very limited in the published literature. Accordingly, this article presents a comprehensive review of the recent progress in the application of g-C₃N₄ for CO₂ capture and conversion. It commences with a brief introduction, followed by a brief overview of the structure of g-C₃N₄ and its commonly used synthesis methods. Detailed review of the recent studies on the utilization of g-C₃N₄ for CO₂ capture via adsorption is presented next. Yet, the main part of this review article is devoted to discuss recent progresses in the photocatalytic, electrocatalytic, and thermo-catalytic conversion of CO₂ using g-C₃N₄. The mechanisms of these processes, in addition to the effects of several factors on the conversion of CO₂ using g-C₃N₄ have also been thoroughly discussed. Outlooks and recommendations for future research work to address the challenges and obstacles facing the application of g-C₃N₄ for CO₂ capture and conversion have been highlighted at the end of this review.

二氧化碳排放到大气中是造成全球变暖和伴随而来的气候变化的主要原因。因此，必须制定/实施有效的办法来解决二氧化碳排放问题，并在理想情况下扭转其消极后果。最近，石墨氮化碳（即GCN或g-C3N4）已成为CO2捕获和转化的有吸引力的材料。然而，最近，关于g-C3N4在CO2捕集和转化中的性能的综合综述在已发表的文献中仍然非常有限。因此，本文综述了近年来g-C3N4在CO2捕集与转化中的应用进展。本文首先简要介绍了g-C3N4的结构及其常用的合成方法。详细介绍了近年来利用g-C3N4吸附捕集CO2的研究进展。本文主要讨论了g-C3N4在光催化、电催化和热催化转化CO2方面的最新进展。本文还讨论了这些过程的机理，以及几种因素对g-C3N4转化CO2的影响。展望和建议未来的研究工作，以解决面临的挑战和障碍的g-C3N4在二氧化碳捕集和转化的应用在这篇综述的最后强调。

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引用次数: 0

Microenvironment modulation of carbon-based single-atom catalysts for advanced oxidation processes 碳基单原子催化剂在高级氧化过程中的微环境调节

Environmental Functional Materials

Pub Date : 2024-06-01 DOI: 10.1016/j.efmat.2025.01.002

Zhong-Shuai Zhu, Pengtang Wang, Ya Liu, Shuang Zhong, Xiaoguang Duan, Shaobin Wang

Advanced oxidation processes (AOPs) are among the most effective technologies for environmental remediation, particularly in removing recalcitrant organic pollutants from water. Carbon-based single-atom catalysts (CSACs) combine the strengths of both heterogeneous and homogeneous catalysts and maximize metal utilization via isolated metal active sites, thus fine-tuning the catalytic efficiency in AOPs via engineering molecular architecture. Atomically dispersed metal atoms are usually stabilized through ionic or covalent interactions with neighboring atoms, thus the geometric and electronic properties of CSACs are significantly affected by their local microenvironment. In this review, we explored recent advances in CSAC synthesis, emphasizing both bottom-up and top-down strategies, with a focus on microenvironment modulation. We also discussed the local microenvironment regulation of CSACs in AOPs, considering factors such as the first coordination sphere (metal center choice, site spacing/density and coordination structure) and the medium to long-range coordination (bimetallic doping, heteroatom doping/defect engineering and interface coupling). Finally, we outlined the challenges and prospects of CSAC microenvironment engineering, providing insights for advancing CSACs development in AOPs and beyond.

高级氧化工艺（AOPs）是环境修复中最有效的技术之一，特别是在去除水中难降解的有机污染物方面。碳基单原子催化剂（CSACs）结合了多相和均相催化剂的优点，通过分离的金属活性位点最大限度地利用金属，从而通过工程分子结构微调AOPs的催化效率。原子分散的金属原子通常通过与邻近原子的离子或共价相互作用来稳定，因此CSACs的几何和电子性质受到其局部微环境的显著影响。在这篇综述中，我们探讨了CSAC合成的最新进展，强调自下而上和自上而下的策略，重点是微环境调制。考虑到第一配位球（金属中心选择、位间距/密度和配位结构）和中远程配位（双金属掺杂、杂原子掺杂/缺陷工程和界面耦合）等因素，讨论了AOPs中CSACs的局部微环境调控。最后，我们概述了CSAC微环境工程的挑战和前景，为推进CSAC在AOPs及其他领域的发展提供了见解。

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引用次数: 0

Advancement factors in sludge dewatering technology for wastewater treatment from engineering and economic perspectives: A review 污泥脱水技术在污水处理中的工程与经济进展

Environmental Functional Materials

Pub Date : 2024-06-01 DOI: 10.1016/j.efmat.2025.10.002

Ali Pirouzi, Mehdi Rahimi Asrami, Mohammad Mehdi Sabzehmeidani

The importance of the purifying municipal and industrial wastewater has increased due to a dramatically enhancing flow of sewage sludge in the last decades. There are various types of sludge including high water content, colloidal behavior, and compressibility. The sewage sludge contains about 1–5 wt% of solids and the remaining fraction of sludge is water (95–99 %). The huge amounts of sludge were produced in every year that confirmed the significant challenge in treatment of the sludge from sewage. Improving sludge dewatering reduces subsequent management and transport costs. To achieve this aim, it is necessary to investigate different sludge dewatering methods and indicators that affect sludge dewatering efficiency. In this review study, to clarify these two factors, existing technical understanding regarding sludge dewatering will be useful in practical applications, these two considerations will play a major role in the process of equipment selection and optimization measures. This study has investigated various techniques and devices for dewatering sewage sludge including mechanical, thermal, filtration, chemical, natural, and geotextile methods, and new methods that are the result of combining different processes. In the following, various parameters affecting the dewatering efficiency, including sludge characteristics, moisture content, costs, capacities, and environmental issues were examined, and at the end, challenges and limitations in dewatering processes were examined. Considering the very complex nature of sewage sludge, this study will help choose the sludge dewatering method and provide the conditions to increase the dewatering efficiency.

在过去的几十年里，由于污水污泥流量的急剧增加，净化城市和工业废水的重要性增加了。有各种类型的污泥，包括高含水量，胶体行为和可压缩性。污水污泥含有约1-5 wt%的固体，污泥的剩余部分是水（95 - 99%）。每年产生的大量污泥证实了污水污泥处理的重大挑战。改善污泥脱水可降低后续管理和运输成本。为了实现这一目标，有必要研究不同的污泥脱水方法和影响污泥脱水效率的指标。在本文的综述研究中，明确了这两个因素，现有的关于污泥脱水的技术认识将在实际应用中有所帮助，这两个考虑将在设备选择和优化措施的过程中发挥主要作用。本研究研究了各种脱水污泥的技术和设备，包括机械、热、过滤、化学、自然和土工布方法，以及结合不同工艺的新方法。下面，考察了影响脱水效率的各种参数，包括污泥特性、含水率、成本、容量和环境问题，最后考察了脱水过程中的挑战和限制。考虑到污泥的复杂性质，本研究将有助于污泥脱水方式的选择，为提高脱水效率提供条件。

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引用次数: 0

Strategies and applications of enhancing extracellular electron transfer in anaerobic digestion for wastewater resource recovery:A critical review 厌氧消化中加强细胞外电子转移的策略和应用：综述

Environmental Functional Materials

Pub Date : 2024-06-01 DOI: 10.1016/j.efmat.2025.01.001

Longyi Lv , Xinyuan Wang , Duoying Zhang , Xinyang Liu , Jinsong Liang , Xiaoyang Liu , Wenfang Gao , Li Sun , Zhijun Ren , Guangming Zhang

Utilizing anaerobic digestion (AD) to treat wastewater while recovering the resources in the wastewater is research full of opportunities and challenges. Degradation of pollutants and the generation of resource recovery such as hydrogen and methane in AD relies on the crucial step of extracellular electron transfer (EET). However, the rate of EET in AD may be inhibited due to factors like pollutant toxicity, leading to slow resource recovery efficiency. Enhancing electron transfer process between microorganisms and pollutants through exogenous addition of electron shuttles can promote the degradation rate of pollutants and help the reaction system to detoxify rapidly. Exogenous addition of conductive materials can enhance electron transfer process between microorganisms and help improve the stability and efficiency of resource recovery process for hydrogen, methane, and high-value products. The review provided a comprehensive review of different types, mechanisms, and enhancement strategies of EET. The review summarized various approaches and mechanisms for promoting energy recovery in AD through the enhancement of EET and highlights limitations of current research. A discussion of the environmental and economic evaluation of exogenously added mediator-enhanced anaerobic resource recovery was presented in the review. Lastly, the review offered prospects for the application of strategies to enhance EET. The aim of the review is to further improve the applicability of enhancing EET in anaerobic wastewater treatment.

利用厌氧消化技术对废水进行处理，同时回收废水中的资源，是一项充满机遇和挑战的研究。AD中污染物的降解和氢、甲烷等资源回收的产生依赖于细胞外电子转移（EET）这一关键步骤。然而，由于污染物毒性等因素，AD中EET的速率可能受到抑制，导致资源回收效率缓慢。通过外源添加电子穿梭体增强微生物与污染物之间的电子传递过程，可以促进污染物的降解速度，帮助反应体系快速解毒。外源添加导电材料可以增强微生物之间的电子传递过程，有助于提高氢气、甲烷和高价值产品资源回收过程的稳定性和效率。本文对EET的不同类型、机制和增强策略进行了综述。综述了通过增强EET促进AD能量回收的各种方法和机制，并指出了目前研究的局限性。本文就外源添加介质强化厌氧资源回收的环境经济评价进行了综述。最后，展望了提高环境效应策略的应用前景。本文旨在进一步提高强化EET在厌氧废水处理中的适用性。

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