粉状黑云母活化过硫酸盐降解染料活性绿19的活化机制

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中图分类号：X703 文献标志码：A

Abstract： Iron containing minerals are earth-abundant， low cost， and able to tragger H2O2 and persulfate （PS）. Biotite contains Fe2+ and has reducing properties，and there are limited studies on its activation of PS to remove pollutants. In this study powdered biotite （PB） was used to activate PS for degradation of a reactive azo dye，reactive green 19 （RGl9）. Results showed that PB was able to efficiently activate PS to produce OH·and SO4- ·，which were responsible for the degradation of RG19.Approximately 95% of 5.0×10-5mol/L RG19 was decolorized in 15min and azo bonds were completely broken down under the conditions of 5.0×10-3mol/L PS， 1.0g/L PB，initial pH6.0 ，and 55°C . Decolorization process followed a pseudo-second-order （PSO） kinetics. The American dye manufacturers institute（ADMI） color scale and total organic carbon removal were both taken in consideration and the oxidative degradation efficiency at 98.2% and 71.2% ，respectively. The high activation energy of 34.96kJ/mol indicated that the reaction was significantly affected by temperature. PB can be used as an efficient activator for PS to degrade dye wastewater.

Key words： reactive green 19； powdered biotite； persulfate;oxidation degradation; activatiormechanism;degradation efficiency

0 引言

高级氧化过程（AOPs）是基于产生高活性自由基的氧化反应，自由基包括羟基自由基（ OH⋅） 和硫酸盐自由基 （SO4-⋅） ，它们能够降解大多数有机污染物。（剩余15614字）