铁盐改性蒙脱土活化过一硫酸盐去除水中双酚A效能与机理

Catalytic degradation performance and mechanism of bisphenol A by peroxymonosulfate activation through Fe(Ⅲ)-modified montmorillonite

有机微污染物是饮用水处理的新兴难题,过一硫酸盐氧化是去除有机微污染物的有效途径,但存在催化剂成本高、制备和再生过程复杂等问题。本文尝试利用三价铁盐改性后的蒙脱土(Fe-MMT)作为过一硫酸盐催化剂,研究Fe-MMT活化过一硫酸盐(PMS)降解饮用水中双酚A的规律和效能。实验结果表明:双酚A能够快速吸附到Fe-MMT表面,并在1 h内的去除率高达96.4%。分析认为,Fe-MMT的纳米级层间距加速了Fe^(3+)与PMS间的电子转移,有利于PMS活化分解产生HO·和SO_(4)·^(-)自由基,导致水中双酚A快速降解。此外,Fe-MMT的层状结构能够有效抑制水中背景腐殖酸成分对PMS活化的影响。铁盐改性蒙脱土的制备和再生过程简单,可作为过一硫酸盐催化剂应用于饮用水处理领域。

Organic micropollutant is an emerging problem in drinking water treatment.Oxidation by peroxymonosulfate activation is an efficient measurement for the degradation of organic micropollutants.However,the cost of current catalysts is high,and their preparation and regeneration processes are complicated.This work attempts to modify the natural montmorillonite with Fe(Ⅲ)salt,which is used as the peroxymonosulfate activator for the degradation of bisphenol A(BPA)in drinking water.Results show that BPA was quickly adsorbed onto the surface of montmorillonite,and the removal rate was up to 96.4%in 1 h.The nanoscale interlayer of Fe(Ⅲ)-modified montmorillonite(Fe-MMT)accelerated the transformation of electrons between Fe(Ⅲ)and PMS,which was beneficial to the decomposition of PMS to generate HO·and SO_(4)·^(-) radicals,accelerating the degradation of BPA in water.In addition,the mesoporous layer structure of Fe-MMT could effectively inhibit the effects of humic acids on the PMS activation.Fe-MMT with easy preparation and regeneration processes can be used as the PMS activator in drinking water treatment.