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基于碳纳米管膜的流动式反应器中过一硫酸盐的原位光热活化及其对污染物的降解。

In-situ photothermal activation of peroxydisulfate in a carbon nanotubes membrane-based flow-by reactor toward degradation of contaminants.

机构信息

State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.

Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.

出版信息

Chemosphere. 2022 Sep;303(Pt 2):135119. doi: 10.1016/j.chemosphere.2022.135119. Epub 2022 May 25.

DOI:10.1016/j.chemosphere.2022.135119
PMID:35642858
Abstract

The energy-induced peroxydisulfate (PDS) activation is a green and effective approach for pollutant degradation, while the huge energy consumption would significantly increase the cost of wastewater treatment. In this study, by taking carbon nanotubes (CNTs) membrane as the light to heat (LTH) conversion materials, we developed a photothermal PDS activation process for degradation of organic contaminants in a flow-by reactor, with hydroxyl radicals (OH) and sulfate radicals (SO) as the main reactive species. This system has excellent in-situ LTH conversion performance and heat transfer ability. As a result, various pollutants are degraded with an efficiency higher than 90%. More importantly, the LTH device exhibits satisfying stability and could be used for pollutant (i.e., methyl orange (MO)) removal under solar irradiation. In addition, some important factors (i.e., irradiation distance, residence time, solution pH, and PDS dosage) that might significantly influence the removal efficiency of pollutants are optimized. This work provides a novel perspective for the activation of PDS via CNTs as photothermal materials for pollutant degradation with a flow-by reactor.

摘要

能量诱导过二硫酸盐 (PDS) 活化是一种用于污染物降解的绿色且有效的方法,但巨大的能量消耗将显著增加废水处理的成本。在本研究中,我们以碳纳米管 (CNTs) 膜作为光热 (LTH) 转换材料,开发了一种用于在流动式反应器中降解有机污染物的光热 PDS 活化工艺,以羟基自由基 (OH) 和硫酸根自由基 (SO) 作为主要反应性物质。该系统具有优异的原位 LTH 转换性能和传热能力。结果,各种污染物的降解效率均高于 90%。更重要的是,LTH 装置表现出令人满意的稳定性,并且可以在太阳照射下用于去除污染物(例如甲基橙 (MO))。此外,还优化了一些可能显著影响污染物去除效率的重要因素(例如,照射距离、停留时间、溶液 pH 值和 PDS 用量)。这项工作为通过 CNTs 作为光热材料在流动式反应器中用于污染物降解的 PDS 活化提供了新的视角。

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