Environmental Functional Materials最新文献

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Peroxymonosulfate activation for preferential generation of hydroxyl radical with atomic Mn anchored TiO2 in photoelectrochemical process 过氧单硫酸盐活化在光电化学过程中优先生成羟基自由基

Environmental Functional Materials

Pub Date : 2023-03-01 DOI: 10.1016/j.efmat.2023.04.002

Min Chen , Jinxing Zhang , Tian Yang , Shun Mao , Hongying Zhao

The threaten of ubiquitous antibiotics to human and ecosystem makes it urgent to seek efficient treatment technologies. Peroxymonosulfate (PMS)-based advanced oxidation processes have revealed wide prospects for wastewater treatment via controllable PMS activation for desired ROS generation. Herein, a novel TiO₂ photoelectrode decorated with atomically distributed Mn (SA-MnTiO₂) was designed via a modified molten salt method (MSM) for photo-electro-catalytic (PEC) activation of PMS. The electron transfer in reduction-/oxidation-state Mn(II)/Mn(III)/Mn(IV) cycles facilitated the cleavage of intramolecular O–O bonds in PMS to preferentially generate hydroxyl radical (HO•). Almost complete degradation of norfloxacin (NOR) was occurred with optimal SA-Mn_0.6TiO₂ within 15 min, exhibiting high turnover frequency (0.066 min⁻¹). Around 74.8% of total organic carbon was eliminated with a low specific energy consumption of 0.94 kW h/g. The key operational parameters during actual wastewater treatment were inspected for SA-Mn_0.6TiO₂/PMS system, suggesting the satisfactory stability for practical applications.

无处不在的抗生素对人类和生态系统的威胁，迫切需要寻求有效的治疗技术。基于过氧化一硫酸盐（PMS）的高级氧化工艺通过可控的PMS活化产生所需的ROS，显示了废水处理的广阔前景。本文通过改进的熔盐法（MSM）设计了一种原子分布Mn修饰的新型TiO2光电极（SA-MnTiO2），用于PMS的光电催化（PEC）活化。还原态/氧化态Mn（II）/Mn（III）/Mn（IV）循环中的电子转移促进了PMS中分子内O–O键的断裂，从而优先产生羟基自由基（HO•）。最佳SA-Mn0.6TiO2在15min，表现出高周转频率（0.066 min−1）。以0.94的低比能耗消除了约74.8%的总有机碳kWh/g。考察了SA-Mn0.6TiO2/PMS系统在实际污水处理过程中的关键操作参数，表明该系统具有良好的稳定性，可用于实际应用。

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引用次数: 1

Enhancing the photocatalytic removal of toluene by modified porous TiO2 with internal hydrophobic interface 具有内部疏水界面的改性多孔TiO2增强光催化去除甲苯的性能

Environmental Functional Materials

Pub Date : 2023-03-01 DOI: 10.1016/j.efmat.2023.02.002

Hao Ge , Shuyuan Dong , Zhenfeng Bian

The efficiency and stability of photocatalytic oxidation techniques in the treatment of volatile organic compounds (VOCs) in the air are affected by the adsorption performance at the reaction interface and the photogenerated electron–hole separation efficiency. Carbon-loaded porous TiO₂ with an internal hydrophobic interface was prepared by finely controlling the calcination time and temperature of a titanium-based metal–organic framework (MIL-125). The carbon load in the porous TiO₂ presents a gradient from the pore surface to the interior. The formed hydrophobic interface in the channel avoids competitive adsorption between gas-phase toluene and H₂O and effectively improves photogenerated electron transfer. Experiments and comprehensive analysis by using techniques such as thermogravimetric analysis, Raman spectroscopy, and ultraviolet diffuse-reflectance spectroscopy clarified the mechanism of gradient carbon formation in the porous TiO₂, in which the organic ligands in MIL-125 are carbonized during calcination because of the low oxygen content of the pores. The sample prepared by pyrolyzing MIL-125 at 400 °C for 1 h showed the best activity in the photocatalytic degradation of toluene; the activity was twice that achieved with the commercial photocatalyst P25. Surface photovoltage spectroscopy and photoelectrochemical measurements proved that the gradient carbon load enhances photogenerated electron transfer in the porous TiO₂. In-situ diffuse-reflectance infrared Fourier-transform spectroscopy was used to investigate the processes of photocatalytic degradation of toluene, in which the generation of C–H-containing intermediates is a crucial step. This research provides a novel concept for the future design and modification of photocatalyst structures for the effective photocatalytic degradation of VOCs.

光催化氧化技术处理空气中挥发性有机化合物的效率和稳定性受反应界面吸附性能和光生电子-空穴分离效率的影响。通过精细控制钛基金属-有机框架（MIL-125）的煅烧时间和温度，制备了具有内部疏水界面的碳负载多孔TiO2。多孔TiO2中的碳负载呈现从孔表面到内部的梯度。通道中形成的疏水界面避免了气相甲苯和H2O之间的竞争性吸附，并有效地改善了光生电子转移。通过使用热重分析、拉曼光谱和紫外漫反射光谱等技术进行的实验和综合分析阐明了多孔TiO2中梯度碳形成的机制，其中MIL-125中的有机配体在煅烧过程中由于孔的低氧含量而被碳化。通过在400下热解MIL-125制备的样品°C 1h对甲苯的光催化降解活性最好；活性是商业光催化剂P25的两倍。表面光电压谱和光电化学测量证明，梯度碳负载增强了多孔TiO2中的光生电子转移。采用原位漫反射红外傅立叶变换光谱法研究了甲苯的光催化降解过程，其中含C–H中间体的生成是关键步骤。本研究为未来设计和改性光催化剂结构以有效光催化降解挥发性有机物提供了一个新的概念。

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引用次数: 1

Metal sulfide-based catalysts in advanced oxidation processes for water decontamination 金属硫化物基催化剂在水净化高级氧化工艺中的应用

Environmental Functional Materials

Pub Date : 2023-02-01 DOI: 10.1016/j.efmat.2023.01.004

Zelin Wu, Z. Xiong, Bo-Chen Lai

引用次数: 6

Bimetallic atomic Fe–Mn metal-nitrogen active sites for synergistic enhancement of CO2 electroreduction efficiency 双金属原子铁锰金属氮活性位点协同提高CO2电还原效率

Environmental Functional Materials

Pub Date : 2023-02-01 DOI: 10.1016/j.efmat.2023.01.003

Chunlu Ma, Hui Zhang, Wenwen Kong, B. Shen, H. Lyu

引用次数: 3

Dual-strategy modification on g-C3N4 for highly efficient inactivation of Microcystis aeruginosa under visible light g-C3N4双策略修饰在可见光下高效灭活铜绿微囊藻

Environmental Functional Materials

Pub Date : 2023-01-01 DOI: 10.1016/j.efmat.2023.01.001

Yuhao Zhao, Dongxu Wang, Huinan Che, Bin Liu, Y. Ao

引用次数: 2

Microwave-assisted synthesis of bimetallic NiCo-MOF-74 with enhanced open metal site for efficient CO2 capture 微波辅助合成双金属NiCo-MOF-74，增强开放金属位，有效捕获CO2

Environmental Functional Materials

Pub Date : 2023-01-01 DOI: 10.1016/j.efmat.2023.01.002

Changwei Chen, M. Kosari, Meizan Jing, Chi He

引用次数: 3

FeO @FeP heterostructure: Surface phosphorization toward efficient photocatalytic Fenton-like norfloxacin removal FeO @FeP异质结构:表面磷酸化对光催化芬顿类诺氟沙星的高效去除

Environmental Functional Materials

Pub Date : 2022-12-01 DOI: 10.1016/j.efmat.2022.12.002

Yukun Zhu, Abiduweili Sikandaier, Yifei Zhang, Xiaoxia Wang, Baoyin Du, Jingfei Xue, Yuanyu Sun, Ping Lu, Dongjiang Yang

引用次数: 2

Comprehensive insight into heterogeneous persulfate activation for environmental pollutants degradation: Approaches and mechanism 全面了解多相过硫酸盐活化对环境污染物降解的影响:方法和机制

Environmental Functional Materials

Pub Date : 2022-12-01 DOI: 10.1016/j.efmat.2022.12.001

Ruonan Guo, B. Xi, Changsheng Guo, Ningqing Lv, Jian Xu

引用次数: 5

Challenging the contamination of per- and polyfluoroalkyl substances in water: Advanced oxidation or reduction? 挑战全氟烷基和多氟烷基物质在水中的污染:高级氧化或还原?

Environmental Functional Materials

Pub Date : 2022-11-01 DOI: 10.1016/j.efmat.2022.11.002

Zhanghao Chen, Xinhao Wang, R. Dong, Yutong Zhang, Xin Jin, Cheng Gu

引用次数: 3

Recent progress on single-atom catalysts in advanced oxidation processes for water treatment 水处理高级氧化工艺中单原子催化剂的研究进展

Environmental Functional Materials

Pub Date : 2022-11-01 DOI: 10.1016/j.efmat.2022.11.001

Chunyang Zhai, Yangpeng Chen, Xiaoxiao Huang, A. Isaev, Mingshan Zhu

引用次数: 17

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