Environmental Functional Materials最新文献

英文中文

Persulfate activation by Fe, N co-doped carbon: Effect of N-containing groups on electron structure of Fe-Nx sites 铁、氮共掺杂碳的过硫酸盐活化作用：含氮基团对 Fe-Nx 位点电子结构的影响

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.09.001

Qin Wen , Fei Qi , Shizong Wang , Zequan Zeng , Zhanggen Huang

Iron and nitrogen co-doped carbon (Fe-N-C) with Fe-N_x and graphitic N sites shows great potential in persulfate (PS) activation for organic pollutants degradation. Fe-N_x and graphitic N sites were quantified by X-ray photoelectron spectroscopy (XPS) to determine their ratios. The interaction between Fe-N_x and graphitic N and the mechanism affecting the catalytic activity were systematically explored by combining experiments and theoretical calculations. The results indicated a significant synergistic effect between Fe-N_x and graphitic N. Especially, Fe-N-C with a 1:4 ratio of Fe-N_x to graphitic N owned the highest turnover frequency (TOF) value (1.59 × 10⁻³ g m⁻² min⁻¹). The contributions of radical mechanism influenced TOF values of Fe-N-C-rx to a certain extent. Theoretical calculations proved that the coordination environment could regulate the electronic structure of active sites, thereby affecting catalytic activity. Fe-N-C with a ratio of 1:4 Fe-N_x to graphitic N had maximum adsorption energy (E_ads), O-O bond length (l_O-O) and the optimal d-band center value, which promoted adsorption and electron transfer with PS. The 2,4-Dichlorophenol (2,4-DCP) degradation behavior was also explored by combining Fukui functions and mass spectrometry analysis.

具有 Fe-Nx 和石墨 N 位点的铁氮共掺杂碳（Fe-N-C）在过硫酸盐（PS）活化降解有机污染物方面具有巨大潜力。通过 X 射线光电子能谱（XPS）对铁-氮和石墨 N 位点进行量化，以确定它们的比例。结合实验和理论计算，系统地探讨了 Fe-Nx 和石墨 N 之间的相互作用以及影响催化活性的机理。结果表明，Fe-Nx 与石墨 N 之间存在明显的协同效应，尤其是 Fe-Nx 与石墨 N 的比例为 1:4 的 Fe-N-C 具有最高的翻转频率（TOF）值（1.59 × 10-3 g m-2 min-1）。自由基机制的贡献在一定程度上影响了 Fe-N-C-rx 的 TOF 值。理论计算证明，配位环境可以调节活性位点的电子结构，从而影响催化活性。Fe-Nx 与石墨 N 的比例为 1:4 的 Fe-N-C 具有最大的吸附能（Eads）、O-O 键长度（lO-O）和最佳的 d 带中心值，从而促进了与 PS 的吸附和电子转移。此外，还结合福井函数和质谱分析，探讨了 2,4-DCP 的降解行为。

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引用次数: 0

Modified Titanium dioxide-based photocatalysts for water treatment: Mini review 用于水处理的改性二氧化钛基光催化剂：小型综述

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.07.002

Xiaowen Yang, Ran Zhao, Hong Zhan, Hexiang Zhao, Yingnan Duan, Zhurui Shen

Titanium dioxide (TiO₂), recognized for its affordability, low cost, high chemical stability, and eco-friendliness, has garnered extensive research attention in recent years. But because of the TiO₂ band gap (>3.2eV) seriously limit the use of visible light, and fast electron-hole composite in TiO₂ often lead to poor photocatalytic activity and low quantum yield. Therefore, TiO₂ needs to be modified. Modification can change the broadband gap of TiO₂, enhance light absorption, thus affect the important means of photocatalytic efficiency. In this review, we introduce the crystal form and photocatalytic mechanism of TiO₂, and review some modification strategies of TiO₂, including doping modification, construction of heterojunctions, crystal plane engineering and defect engineering. Furthermore, we review the application of modified TiO₂-based photocatalytic materials in water treatment, including the removal of dye contaminants, antibiotics, advanced oxidative sterilization, and finally explore the challenges and prospects of modified TiO₂-based photocatalysts.

二氧化钛（TiO2）因其经济实惠、成本低廉、化学稳定性高和环保等优点，近年来受到了广泛的研究关注。但由于 TiO2 的带隙（3.2eV）严重限制了其对可见光的利用，而且 TiO2 中快速的电子-空穴复合往往导致光催化活性差、量子产率低。因此，需要对 TiO2 进行改性。改性可以改变 TiO2 的宽带隙，增强光吸收，从而影响光催化效率的重要手段。在这篇综述中，我们介绍了 TiO2 的晶体形态和光催化机理，并综述了 TiO2 的一些改性策略，包括掺杂改性、构建异质结、晶面工程和缺陷工程。此外，我们还综述了改性 TiO2 基光催化材料在水处理中的应用，包括去除染料污染物、抗生素、高级氧化杀菌等，最后探讨了改性 TiO2 基光催化剂面临的挑战和发展前景。

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引用次数: 0

Advance of self-cleaning separation membranes for oil-containing wastewater treatment 用于含油废水处理的自清洁分离膜的进展

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.06.001

The formidable challenge of membrane fouling by high-viscosity oils remains a primary impediment to the sustainable application of separation membranes in treating oil-contaminated wastewater. Consequently, there is an imperative for the development of oil-contaminated wastewater treatment membranes endowed with self-cleansing capabilities. The current review aims to delineate the landscape of self-cleansing membranes tailored for the treatment of oil-contaminated wastewater. Embarking from the foundational theories and benchmarks of self-cleansing, the self-cleansing functionalities were classified into active and passive modalities. We encapsulate the strides made in research, encompassing domains such as super-wettable surfaces, synchronously filtered self-cleansing, and post-filtration high-efficiency self-cleansing, while concurrently identifying extant constraints and prospective trajectories. By meticulously categorizing and dissecting self-cleansing functionalities, the aim of this work is delving into the fundamental tenets of self-cleansing within membranes intended for treating oil-contaminated wastewater, and furnishing guidance for the design and advancement of self-cleansing functionalities in oil-water separation membranes.

高粘度油对膜造成污垢的巨大挑战仍然是分离膜在处理油污染废水中可持续应用的主要障碍。因此，开发具有自清洁能力的油污染废水处理膜势在必行。本综述旨在描述专为处理油污染废水而定制的自清洁膜的发展前景。从自清洁的基础理论和基准出发，将自清洁功能分为主动和被动两种模式。我们总结了研究中取得的进展，包括超润湿表面、同步过滤自清洁和过滤后高效自清洁等领域，同时确定了现存的制约因素和未来的发展轨迹。通过对自清洁功能进行细致的分类和剖析，这项工作旨在深入研究用于处理油污染废水的膜内自清洁的基本原理，并为油水分离膜中自清洁功能的设计和发展提供指导。

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引用次数: 0

Progress of CO2 fixation using cycloaddition reaction 利用环化反应固定二氧化碳的进展

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.07.001

Xing Chen , Ye Liu , Guoqiang Wang , Lei Zhang , Yubo Kuang , Haohan Tao , Xiaoqian Xiang , Guangran Di , Xiaojing Yin , Kaixin Wang , Qianqian Cai , Xiaojun Lv

Carbon dioxide, a significant greenhouse gas component, has been impacting the global climate. Photocatalytic CO₂ reduction is a cost-effective and eco-friendly approach. Photocatalytic CO₂ can combine with epoxides to produce cyclic carbonates, garnering considerable attention due to its full atom utilization and alignment with green chemistry principles. This review assesses the current state of research on photocatalytic CO₂ cycloaddition with epoxides, examining factors influencing efficiency through pathways and enhancement methods like light absorption, separation and transfer of photogenerated charges, active site reaction, coupling reaction, and reaction device.

二氧化碳是重要的温室气体成分，一直影响着全球气候。光催化还原二氧化碳是一种具有成本效益且环保的方法。光催化二氧化碳可与环氧化物结合生成环状碳酸盐，因其原子的充分利用和符合绿色化学原则而备受关注。本综述评估了光催化二氧化碳与环氧化物环加成的研究现状，通过光吸收、光生电荷的分离和转移、活性位点反应、偶联反应和反应装置等途径和增强方法，探讨了影响效率的因素。

引用次数: 0

Adsorption of 2,4-dichlorophenoxyacetic acid and 4-chlorophenol using bio-based activated carbon: Thermodynamics, kinetics and cytotoxicity evaluation 使用生物基活性炭吸附 2,4-二氯苯氧乙酸和 4-氯苯酚：热力学、动力学和细胞毒性评估

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.09.002

Rashda , Aaron Albert Aryee , Dai Kailu , Shumaila Kiran , Zhaohui Li , Runping Han

This study investigates the use of peanut husk biowaste (PH) activated carbon to remove 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chlorophenol (4-CP) from water. Acid activation of PH enhances its structure, creating pores in the activated carbon. SEM, TEM, and XRD confirm the effectiveness of this process. BET analysis shows the increase in surface area from 0.775 to 547 m² g⁻¹ for the PH and PH-AC samples. PH-AC tested against 2,4-D and 4-CP, optimizing pH, contact time, pollutant dose, PH-AC dose, and temperature for maximum adsorption efficiencies. Maximum adsorption capacity for 2,4-D and 4-CP is 165.9 and 99.4 mg g⁻¹, respectively, higher than previous research. Kinetics, adsorption, and thermodynamic studies reveal the endothermic and spontaneous nature of the adsorption process. The adsorbent demonstrates stability and long-term applicability, with substantial adsorption capacities for four cycles. Cytotoxicity studies confirm non-toxicity and environmental friendliness of PH-AC material. These findings highlight the potential of PH-AC for wastewater treatment.

本研究调查了使用花生壳生物废料（PH）活性炭去除水中的 2,4-二氯苯氧乙酸（2,4-D）和 4-氯苯酚（4-CP）的情况。PH 的酸性活化可增强其结构，在活性炭中形成孔隙。SEM、TEM 和 XRD 证实了这一工艺的有效性。BET 分析表明，PH 和 PH-AC 样品的表面积从 0.775 m2 g-1 增加到 547 m2 g-1。PH-AC 针对 2,4-D 和 4-CP 进行了测试，优化了 pH 值、接触时间、污染物剂量、PH-AC 剂量和温度，以获得最大吸附效率。2,4-D 和 4-CP 的最大吸附容量分别为 165.9 mg g-1 和 99.4 mg g-1，高于之前的研究。动力学、吸附和热力学研究揭示了吸附过程的内热和自发性质。该吸附剂具有稳定性和长期适用性，在四个周期内都具有很强的吸附能力。细胞毒性研究证实了 PH-AC 材料的无毒性和环保性。这些研究结果突显了 PH-AC 在废水处理方面的潜力。

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引用次数: 0

The application of diatomic catalysts in advanced oxidation Fenton-like water treatment technology:A mini review 二原子催化剂在高级氧化 Fenton 类水处理技术中的应用：微型综述

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.07.003

Ran Zhao , Xiao-Wen Yang , Tian-Hao Li , Tian-Miao Yu , Fang-Yuan Chen , Zhu-Rui Shen

In the past few years, there has been a widespread utilization of diatomic catalysts in the catalysis sector because of their distinct benefits. In this review, we specify the application of diatomic catalysts based on carbon and carbon nitride in the Fenton-like field. This paper focuses on the synthesis and characterization of homonuclear and heteronuclear diatomic catalysts and methods to improve the catalytic performance by optimizing d-band structure, tuning charge transfer, and constructing spin states. There is no doubt that diatomic catalysts have bright prospects in the Fenton-like field.

在过去几年中，由于二原子催化剂的独特优势，它们在催化领域得到了广泛应用。在这篇综述中，我们具体介绍了基于碳和氮化碳的二原子催化剂在类芬顿领域的应用。本文的重点是同核和异核二原子催化剂的合成和表征，以及通过优化 d 带结构、调整电荷转移和构建自旋态来提高催化性能的方法。毫无疑问，二原子催化剂在 Fenton-like 领域具有广阔的前景。

引用次数: 0

Hydrophobic MOF-808 particles encapsulated melamine sponge for efficient oil-water separation 疏水性 MOF-808 粒子包裹三聚氰胺海绵，实现高效油水分离

Environmental Functional Materials

Pub Date : 2024-03-01 DOI: 10.1016/j.efmat.2024.07.004

Shengquan Liu , Peng Li , Yuezhong Zhang , Xinli Gao , Guoyong Wang , Sufang Song , Xudong Zhao

Developing highly efficient adsorbents is one of the most feasible strategies to achieve oil-water separation. Herein, we exploited a new hydrophobic metal-organic framework (MOF) by a post-synthesis acid-exchange method. Pentadecafluorooctanoic acid (PFOA) was applied to substitute the acetic acid of MOF-808 to result in the fluorinated MOF-808-PFOA, which owns much larger water contact angle than the primary MOF-808. Further, we successfully loaded these sub-micron MOF-808-PFOA particles into a melamine (MA) sponge, via the crosslinking effect by polydimethylsiloxane (PDMS). The prepared MOF/PDMS/MA sponge shows a high contact angle of 151.9°, induced by the increased surface roughness of mesh filament and decreased surface energy. Meanwhile, it is found that this excellent hydrophobility remains well under different water media and pH values. Combining with the high hydrophobiclity, mechanical stability and porous structure, this sponge shows an excellent adsorption performance for various classes of organic oils, with the large saturated adsorption capacities (27–65 g g⁻¹), short equilibrium time (∼3 s), and good recyclability. More interestingly, this sponge can serve as a filter cartridge to achieve the effective continuous oil-water separation, even under long-term use. Thus, our work provides a new sponge-based adsorbent for efficient oil-water separation, and proposes a feasible strategy to construct hydrophobic MOFs via post-synthesis methods.

开发高效吸附剂是实现油水分离的最可行策略之一。在此，我们采用合成后酸交换方法开发了一种新型疏水性金属有机框架（MOF）。用十五氟辛酸（PFOA）替代 MOF-808 的乙酸，得到氟化 MOF-808-PFOA，其水接触角远大于原生 MOF-808。此外，通过聚二甲基硅氧烷（PDMS）的交联作用，我们成功地将这些亚微米级的 MOF-808-PFOA 颗粒装载到了三聚氰胺（MA）海绵中。所制备的 MOF/PDMS/MA 海绵的接触角高达 151.9°，这是由于网状丝表面粗糙度增加和表面能降低所致。同时，研究还发现这种优异的疏水性在不同的水介质和 pH 值下都能保持良好。结合高疏水性、机械稳定性和多孔结构，该海绵对各类有机油具有优异的吸附性能，饱和吸附容量大（27-65 g-1），平衡时间短（∼3 s），可回收性好。更有趣的是，这种海绵可用作滤芯，即使长期使用也能实现有效的连续油水分离。因此，我们的研究为高效油水分离提供了一种新型海绵吸附剂，并提出了一种通过后合成方法构建疏水 MOFs 的可行策略。

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