CoCo-PBA@CuFe-LDH活化过一硫酸盐降解阿特拉津

摘要为了有效降解废水中的阿特拉津（ATZ），采用共沉淀法将钴基-普鲁士蓝类似物（CoCo-PBA）负载于层状双金属氢氧化物CuFe-LDH上，制得复合材料CoCo-PBA@CuFe-LDH，用于活化过一硫酸盐（PMS）降解ATZ。通过考察降解过程的主要影响因素，发现提高催化剂CoCo-PBA@CuFe-LDH用量和反应温度有利ATZ的降解；PMS用量过多会对ATZ的降解产生轻微的抑制作用；过酸和过碱的环境都对ATZ降解产生不利影响；体系中存在的HCO₃^-，H₂PO₄^-和Cl^-等离子对ATZ的降解均表现出了一定的抑制作用。研究得到了CoCo-PBA@CuFe-LDH/PMS体系降解ATZ的较优反应条件为ATZ浓度15 mg·L^-1，催化剂用量50 mg·L^-1，PMS用量300 mg·L^-1，初始pH值为6.3，反应温度298 K。当反应15 min后，ATZ的降解率可达到99.5%。循环使用4次后，ATZ的降解率仍达到83.4%，表明CoCo-PBA@CuFe-LDH具有较好的催化活性和重复使用性。另外，研究发现CoCo-PBA@CuFe-LDH活化PMS降解ATZ体系中，可以同时产生SO₄^·-和·OH 2种自由基，SO^·-₄对ATZ的降解起到更关键的作用。

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	马晓
	王燕
	李国兵
	蔡旺锋

关键词：过一硫酸盐(PMS)； CoCo-PBA@CuFe-LDH；阿特拉津(ATZ)；硫酸根自由基；降解

Abstract： In order to effectively degrade atrazine (ATZ) in wastewater, CoCo-PBA@CuFe-LDH composite was prepared by using co-precipitation method to load cobalt-based Prussian blue analogue (CoCo-PBA) on the layered double hydroxides CuFe-LDH, which was used to activate peroxymonosulfate (PMS) for ATZ degradation. Investigating of the main influencing factors of the degradation process revealed that increase of CoCo-PBA@CuFe-LDH dosage and temperature were all favorable to ATZ degradation; excessive dosage of PMS has a slight inhibitory effect on ATZ degradation; over-acidic and over-alkaline environments were not beneficial to ATZ degradation; the presence of HCO₃^-, H₂PO₄^-, and Cl^- ions in the system all showed certain inhibitory effects on ATZ degradation. The optimal reaction conditions for the degradation of ATZ in CoCo-PBA@CuFe-LDH/PMS system were as follows:15 mg·L^-1 ATZ, 300 mg·L^-1 PMS, 50 mg·L^-1 CoCo-PBA@CuFe-LDH, initial pH 6.3, and temperature 298 K, and the degradation rate of ATZ was up to 99.5% after 15 min. After 4 times of recycling, the degradation rate of ATZ still reached 83.4%, indicating that CoCo-PBA@CuFe-LDH had good catalytic activity and reusability. In addition, the study found that sulfate radicals (SO^·-₄) and hydroxyl radicals (·OH) were generated simultaneously in the CoCo-PBA@CuFe-LDH/PMS system, and SO₄^·- played a more critical role in the degradation of ATZ.

Keywords： peroxymonosulfate (PMS)； CoCo-PBA@CuFe-LDH； atrazine (ATZ)； sulfate radicals； degradation

Received 2020-06-08;

Corresponding Authors: 蔡旺锋,E-mail:wfcai@tju.edu.cn。 Email: wfcai@tju.edu.cn

About author: 马晓(1995-),男,硕士研究生,现从事废水水处理方面的研究。

引用本文:

马晓, 王燕, 李国兵, 蔡旺锋.CoCo-PBA@CuFe-LDH活化过一硫酸盐降解阿特拉津[J]. 化学工业与工程, 2021,38(2): 9-18

Ma Xiao, Wang Yan, Li Guobing, Cai Wangfeng.Activation Peroxymonosulfate by CoCo-PBA@CuFe-LDH for the Degradation of Atrazine[J]. Chemcial Industry and Engineering, 2021,38(2): 9-18

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