摘要
利用PMS碱催化法处理亚甲基蓝、酸性橙7(AO7)和罗丹明B(RhB)3种典型染料,优化了脱色条件并分析了机理.在pH=10.8~11.5(亚甲基蓝)或pH=10.0~10.8(酸性橙7或罗丹明B),PMS投加量100mg/L的最优条件下,亚甲基蓝、酸性橙7和罗丹明B的脱色速率常数可分别达到0.097,0.074,0.004min-1,脱色率可分别达到95.1%,93.3%和30.1%.捕获剂实验证实PMS碱催化脱色3种染料时起主要作用的均是单线态氧.基于紫外-可见全波长光谱的结果推测,亚甲基蓝和酸性橙7反应脱色较快可归因于单线态氧对噻嗪生色基团和偶氮键的攻击更有效率.
Three typical dyes,methylene blue,acid orange 7,and rhodamine B were treated by base catalysis of PMS in this study to investigate the optimal degradation conditions and the mechanism.Under the optimal condition(pH=10.8~11.5(methylene blue)or pH=10.0~10.8(acid orange 7 or rhodamine B),PMS dosage=100mg/L),the decolorization rate constants of methylene blue,acid orange 7 and rhodamine B were 0.097,0.074,and 0.004min-1,respectively,and the decolorization efficiency were 95.1%,93.3%,and 30.1%,respectively.The scavenging tests indicated that singlet oxygen played a critical role in the treatment by PMS/base for all of the three dyes.Based on the results of UV-Vis spectra analysis,it could be speculated that the faster decolorization rates of methylene blue and acid orange 7 could be due to the more efficient oxidation of the thiazide chromophore group and the azo bond by singlet oxygen.
作者
翟俊
柳沛松
赵聚姣
ZHAI Jun;LIU Pei-song;ZHAO Ju-jiao(Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment,College of Environment and Ecology,Chongqing University,Chongqing 400045,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第2期647-652,共6页
China Environmental Science
基金
重庆市社会事业与民生保障科技创新专项重点研发项目(csct2017shms-zdyfX0050)。
