Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 5

年份

2023 2

2021 1

2019 2

关键词

MOF基催化剂 1

吸附 1

自由基 1

过一硫酸盐 1

非自由基 1

展开︾

检索范围：

排序：展示方式：

Enhanced activation of peroxymonosulfate by CNT-TiO

Xuemin Hao, Guanlong Wang, Shuo Chen, Hongtao Yu, Xie Quan

《环境科学与工程前沿（英文）》 2019年第13卷第5期 doi: 10.1007/s11783-019-1161-0

摘要： CNT-TiO2 composite is used to activate PMS under UV-light assistance. Superior performance is due to the enhanced electron-transfer ability of CNT. SO4•−, •OH and 1O2 play key roles in the degradation of organic pollutants. In this work, a UV-light assisted peroxymonosulfate (PMS) activation system was constructed with the composite catalyst of multi-walled carbon nanotubes (CNT) - titanium dioxide (TiO2). Under the UV light irradiation, the photoinduced electrons generated from TiO2 could be continuously transferred to CNT for the activation of PMS to improve the catalytic performance of organic pollutant degradation. Meanwhile, the separation of photoinduced electron-hole pairs could enhance the photocatalysis efficiency. The electron spin resonance spectroscopy (EPR) and quenching experiments confirmed the generation of sulfate radical (SO4•−), hydroxyl radical (•OH) and singlet oxygen (1O2) in the UV/PMS/20%CNT-TiO2 system. Almost 100% phenol degradation was observed within 20 min UV-light irradiation. The kinetic reaction rate constant of the UV/PMS/20%CNT-TiO2 system (0.18 min−1) was 23.7 times higher than that of the PMS/Co3O4 system (0.0076 min−1). This higher catalytic performance was ascribed to the introduction of photoinduced electrons, which could enhance the activation of PMS by the transfer of electrons in the UV/PMS/CNT-TiO2 system.

关键词： Peroxymonosulfate activation Carbon nanotubes TiO₂ Water treatment

HTML PDF 收藏

The role of manganese oxides in the activation of peroxymonosulfate (PMS)

Jianzhi Huang, Huichun Zhang

《环境科学与工程前沿（英文）》 2019年第13卷第5期 doi: 10.1007/s11783-019-1158-8

摘要： Manganese oxides (MnOx) have been demonstrated to be effective materials to activate Oxone (i.e., PMS) to degrade various contaminants. However, the contribution of direct oxidation by MnOx to the total contaminant degradation under acidic conditions was often neglected in the published work, which has resulted in different and even conflicting interpretations of the reaction mechanisms. Here, the role of MnOx (as both oxidants and catalysts) in the activation of Oxone was briefly discussed. The findings offered new insights into the reaction mechanisms in PMS-MnOx and provided a more accurate approach to examine contaminant degradation for water/wastewater treatment.

关键词： Peroxymonosulfate Manganese oxides Catalyst Oxidant

HTML PDF 收藏

Enhanced catalytic oxidation of 2,4-dichlorophenol via singlet oxygen dominated peroxymonosulfate activation

Tianhao Xi, Xiaodan Li, Qihui Zhang, Ning Liu, Shu Niu, Zhaojun Dong, Cong Lyu

《环境科学与工程前沿（英文）》 2021年第15卷第4期 doi: 10.1007/s11783-020-1347-5

摘要： Abstract • Bi2O3 cannot directly activate PMS. • Bi2O3 loading increased the specific surface area and conductivity of CoOOH. • Larger specific surface area provided more active sites for PMS activation. • Faster electron transfer rate promoted the generation of reactive oxygen species. • 1O2 was identified as dominant ROS in the CoOOH@Bi2O3/PMS system. Cobalt oxyhydroxide (CoOOH) has been turned out to be a high-efficiency catalyst for peroxymonosulfate (PMS) activation. In this study, CoOOH was loaded on bismuth oxide (Bi2O3) using a facile chemical precipitation process to improve its catalytic activity and stability. The result showed that the catalytic performance on the 2,4-dichlorophenol (2,4-DCP) degradation was significantly enhanced with only 11 wt% Bi2O3 loading. The degradation rate in the CoOOH@Bi2O3/PMS system (0.2011 min−1) was nearly 6.0 times higher than that in the CoOOH/PMS system (0.0337 min−1). Furthermore, CoOOH@Bi2O3 displayed better stability with less Co ions leaching (16.4% lower than CoOOH) in the PMS system. These phenomena were attributed to the Bi2O3 loading which significantly increased the conductivity and specific surface area of the CoOOH@Bi2O3 composite. Faster electron transfer facilitated the redox reaction of Co (III) / Co (II) and thus was more favorable for reactive oxygen species (ROS) generation. Meanwhile, larger specific surface area furnished more active sites for PMS activation. More importantly, there were both non-radical (1O2) and radicals (SO4−•, O2−•, and OH•) in the CoOOH@Bi2O3/PMS system and 1O2 was the dominant one. In general, this study provided a simple and practical strategy to enhance the catalytic activity and stability of cobalt oxyhydroxide in the PMS system.

关键词： Cobalt oxyhydroxide Bismuth oxide Peroxymonosulfate 2 4-dichlorophenol Singlet oxygen Electron transfer

HTML PDF 收藏

Magnetic Co-doped 1D/2D structured -FeO/MoS effectively activated peroxymonosulfate for efficient abatement

《环境科学与工程前沿（英文）》 2023年第18卷第3期 doi: 10.1007/s11783-024-1797-2

摘要：

● Magnetic Co- γ -Fe₂O₃/MoS₂ were prepared via facile hydrothermal methods.

关键词： Magnetic Co-γ-Fe₂O₃/MoS₂ Hydrothermal method Bisphenol A Degradation pathways Toxicity analysis

HTML PDF 收藏

MOF-5@Ni衍生的ZnO@Ni₃ZnC_0.7/PMS体系用于有机物去除——对吸附-降解过程的深入理解 Article

帅又文, 黄雪, 张本银, 项璐, 徐浩, 叶倩, 鲁金凤, 张静

《工程（英文）》 2023年第24卷第5期页码 254-264 doi: 10.1016/j.eng.2021.08.029

摘要：

基于过一硫酸盐的非均相催化活化技术在废水处理中越来越受到关注。因此，找到一种可持续、经济、有效的活性材料用于废水处理非常重要。本研究以金属有机框架材料（MOF）-5 为前驱体，通过添加镍离子并随后煅烧制备了一种稳定、可循环利用的材料ZnO@Ni₃ZnC_0.7，该材料表现出良好的吸附和催化性能。为了研究和优化实际应用条件，选择了罗丹明B（RhB）在水中的降解作为模型过程。研究表明，体系中有机物的去除涉及吸附和降解过程的耦合。基于此，提出了整个去除过程的机理。扫描电子显微镜、红外光谱分析和理论分析的结果证实，范德华力、静电吸引力和氢键影响吸附过程。电子顺磁共振分析、遮蔽实验和电化学测试证实，RhB的降解路径包括自由基和非自由基途径，表面羟基是关键的活性位点。对吸附底物的降解使活性位点得到再生。用简单方法再生的材料在4 个循环测试中对有机化合物保持很高的去除效率。此外，这种材料还可以有效地去除各种有机污染物，并且由于具有磁性，材料易于回收。结果表明，使用具有良好吸附能力的非均相催化材料可能是一种经济有效的策略。

关键词： MOF基催化剂过一硫酸盐吸附自由基非自由基