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改性赤泥负载氧化钴催化剂活化过一硫酸盐降解罗丹明B
引用本文:改性赤泥负载氧化钴催化剂活化过一硫酸盐降解罗丹明B. 改性赤泥负载氧化钴催化剂活化过一硫酸盐降解罗丹明B[J]. 山东科学, 2021, 34(5): 113-120. DOI: 10.3976/j.issn.1002-4026.2021.05.014
作者姓名:改性赤泥负载氧化钴催化剂活化过一硫酸盐降解罗丹明B
作者单位:青岛科技大学 化工学院,山东 青岛266042
基金项目:山东省重点研发计划(公益类专项)(2017GSF17111)
摘    要:赤泥是制铝工业排放的强碱性固体废弃物,利用改性赤泥制备类芬顿催化剂可以实现赤泥资源化利用。以酸化改性赤泥为载体,采用浸渍法制备了负载氧化钴催化剂。以罗丹明B为目标物,研究了酸化改性赤泥负载氧化钴催化剂活化过一硫酸盐(peroxymonosulfate,PMS)处理罗丹明B的性能,考察了催化剂用量、PMS浓度、罗丹明B初始浓度以及反应温度的影响。结果表明,在催化剂用量为0.05 g/L、PMS浓度为0.1 mmol/L、溶液初始pH为4.8、反应温度为65 ℃、罗丹明B质量浓度为10 mg/L、反应时间为50 min的条件下,罗丹明B的去除率达到95.9%。淬灭实验结果表明,反应体系中同时存在SO4 、·OH和单线态氧1O2,其中1O2的氧化反应起主导作用。4次循环实验后罗丹明B的去除率仍能维持在80.0%以上。

关 键 词:赤泥  氧化钴  过一硫酸盐  罗丹明B  单线态氧

Degradation of rhodamine B using peroxymonosulfate activated with cobalt oxide supported on acid-treated red mud
ZHANG Qing-qing,XU Yu-sheng,SUN Xiao-jing,XU Dong-yan. Degradation of rhodamine B using peroxymonosulfate activated with cobalt oxide supported on acid-treated red mud[J]. Shandong Science, 2021, 34(5): 113-120. DOI: 10.3976/j.issn.1002-4026.2021.05.014
Authors:ZHANG Qing-qing  XU Yu-sheng  SUN Xiao-jing  XU Dong-yan
Affiliation:College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, China
Abstract:Red mud is an alkaline solid waste produced during aluminum production,and can be recycled by converting acidified red mud into Fenton-like catalyst. In this study, red mud was acidified using hydrochloric acid and then loaded on cobalt oxides via impregnation method to prepare a heterogeneous catalyst. Peroxymonosulfate (PMS) was activated by the as-prepared catalyst to remove Rhodamine B. The effects of catalyst dosage, PMS concentration, initial Rhodamine B concentration, and reaction temperature on the removal efficiency were investigated. Results show that the removal efficiency of Rhodamine B was 95.9% at the catalyst dosage of 0.05 g/L, PMS concentration of 0.1 mmol/L, initial solution pH of 4.8, temperature of 65℃, Rhodamine B concentration of 10 mg/L, and reaction time of 50 min. Free radical scavenging experiment confirmed the presence of SO4,·OH, and singlet oxygen (1O2)in the reaction system, where 1O2played a major role in the oxidation of Rhodamine B. Even in the third reuse of the catalyst, the removal efficiency of Rhodamine B remained above 80%.
Keywords:red mud   cobalt oxides   peroxymonosulfate   Rhodamine B   singlet oxygen  
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