紫外活化过硫酸盐-亚硫酸盐降解三溴苯酚

UV activated persulfate-sulfite for degradation of tribromophenol

较氧化与还原分开进行,构建化学氧化-还原同步协同反应体系,可能具有更高的有机物降解效率.通过紫外光辐照过硫酸钠和亚硫酸钠混合溶液,构建氧化还原同步作用的反应体系,深度降解典型卤代有机污染物三溴苯酚(tribromophenol,TBP),并对该协同反应体系进行主要影响因素优化和机理解析.结果发现,相比单独紫外辐照、紫外-过硫酸钠氧化体系以及紫外-亚硫酸钠还原体系,紫外-过硫酸钠-亚硫酸钠氧化还原体系具备更强的降解和脱溴效能,在过硫酸钠和亚硫酸钠用量均为1.0 mmol/L、pH=7.0的中性反应体系中,反应1 h后,5.0 mg/L的TBP去除率达99.9%以上,脱溴率为83.9%.自由基检测结果进一步验证了反应体系具有显著的氧化还原作用,为典型卤代新污染物的深度去除提供了新的降解方法和技术思路.

Constructing a chemical oxidation-reduction synchronous synergistic reaction system may have higher organic matter degradation efficiency compared to the separate operation of oxidation or reduction.By irradiating a mixed solution of sodium persulfate and sodium sulfite with a ultraviolet light(UV),we construct a redox synchronous reaction system for the deep degradation of typical halogenated organic pollutant tribromophenol(TBP),and optimize the main influencing factors of the synergistic reaction system,and then analyze the concerned mechanism.The results show that the new UV-sodium persulfate-sodium sulfite redox system has stronger degradation and debromination efficiency than those of the single UV irradiation,UV-sodium persulfate oxidation system,and UVsodium sulfite reduction system.In the neutral reaction system with Sodium persulfate and Sodium sulfite dosage of 1.0 mmol/L and pH=7.0,the removal rate of TBP at 5.0 mg/L within 1 hour is over 99.9%and the debromination rate is 83.9%.The free radical detection results further verifies the significant coexistence mechanism of redox effect in the reaction system.This study provides a new degradation method and technical ideas for the deep removal of typical halogenated new pollutants.