Ma Meng, Xu Lu, Jin Xin, Jin Peng-Kang
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Huan Jing Ke Xue. 2021 Mar 8;42(3):1451-1460. doi: 10.13227/j.hjkx.202007187.
In advanced oxidation technology based on sulfate radicals, thermal activation is one of the most effective methods for persulfate (PS) activation, with broad application potential for the use of solar energy to activate PS to degrade pollutants. In this study, the efficiency and mechanism of degradation of rhodamine B by solar thermally activated PS were investigated using a solar collector reactor. The effects of solar irradiation intensity, PS concentration, substrate concentration, initial pH of the solution, and background water quality on the degradation efficiency of rhodamine B were examined. The results show that the solar thermally activated PS system has outstanding oxidation degradation performance with respect to organic pollutants. The removal rate and mineralization rate of rhodamine B reached 94% and 60%, respectively, after a 120 min reaction time. The treatment efficiency of the system was notably affected by the solar radiation intensity, with performance ranked in the order sunny days > cloudy days > rainy days. The treatment efficiency of the system could be significantly improved by increasing the concentration of PS or reducing the initial concentration of the substrate, and by adjusting the initial pH of the solution to neutral. SO·and·OH are the main active oxidants in the reaction system, and·OH plays a major role in the degradation process.
在基于硫酸根自由基的高级氧化技术中，热活化是过硫酸盐（PS）活化最有效的方法之一，在利用太阳能活化PS降解污染物方面具有广阔的应用潜力。本研究采用太阳能集热器反应器，研究了太阳能热活化PS降解罗丹明B的效率及机理。考察了太阳辐照强度、PS浓度、底物浓度、溶液初始pH值和背景水质对罗丹明B降解效率的影响。结果表明，太阳能热活化PS体系对有机污染物具有优异的氧化降解性能。反应120 min后，罗丹明B的去除率和矿化率分别达到94%和60%。系统的处理效率受太阳辐射强度的显著影响，性能排序为晴天>阴天>雨天。通过提高PS浓度或降低底物初始浓度，并将溶液初始pH值调节至中性，可显著提高系统的处理效率。SO·和·OH是反应体系中的主要活性氧化剂，·OH在降解过程中起主要作用。
