CAJ | 학술논문

以苯甲酸(BA)为目标物,研究了几种变价过渡金属离子对于UV/PMS去除污染物效果的影响.实验结果表明,C02+和Mn2+对于BA的去除没有影响；而Fe2+和Fe3+明显地强化了BA的去除.UV/PMS/Fe3+体系中BA降解的假一级速率常数大于相同条件下UV/PMS、UV/Fe3+、Fe3+/PMS三种体系中BA降解的假一级速率常数之和,说明UV/PMS和Fe3+之间存在协同作用.此外,Fe2强化UV/PMS去除BA的效果好于Fe3+,这是由于Fe2+能够迅速还原PMS产生自由基,同时生成Fe3+.最后,研究了铁离子的两种不同类型络合剂磷酸盐和草酸对UV/PMS/Fe3+去除BA的影响.磷酸盐和草酸均抑制了铁离子对BA去除的强化作用.但是,在草酸存在的条件下,UV/PMS/Fe3+对于BA的去除效果仍好于UV/PMS.因此,在实际应用中,UV/PMS与铁离子的组合可能会提高其对污染物的去除效果.
이분갑산(BA)위목표물,연구료궤충변개과도금속리자대우UV/PMS거제오염물효과적영향.실험결과표명,C02+화Mn2+대우BA적거제몰유영향；이Fe2+화Fe3+명현지강화료BA적거제.UV/PMS/Fe3+체계중BA강해적가일급속솔상수대우상동조건하UV/PMS、UV/Fe3+、Fe3+/PMS삼충체계중BA강해적가일급속솔상수지화,설명UV/PMS화Fe3+지간존재협동작용.차외,Fe2강화UV/PMS거제BA적효과호우Fe3+,저시유우Fe2+능구신속환원PMS산생자유기,동시생성Fe3+.최후,연구료철리자적량충불동류형락합제린산염화초산대UV/PMS/Fe3+거제BA적영향.린산염화초산균억제료철리자대BA거제적강화작용.단시,재초산존재적조건하,UV/PMS/Fe3+대우BA적거제효과잉호우UV/PMS.인차,재실제응용중,UV/PMS여철리자적조합가능회제고기대오염물적거제효과.
The effects of several valence-variable transient tnetals on the decontamination by UV/peroxymonosulfate (λ =254 nm,UV/PMS) were studied with benzoic acid (BA) as probe.It was found that Co2+ and Mn2+ showed little effect on the degradation of BA by UV/PMS while Fe2+ and Fe3+ enhanced BA degradation obviously.The synergistic effect between UV/PMS and Fe3+ was confirmed by the results that the pseudo first-order rate constant of BA degradation by UV/PMS/Fe3+ was larger than the sum of that by UV/PMS,UV/Fe3+,and Fe3+/PMS.Furthermore,the stronger enhancement of Fe2+ compared with Fe3 + was found to be due to its initial immediate reduction of PMS to radicals.Finally,the influences of phosphate and oxalate,complexants of iron,were investigated.Results showed that the enhancement of iron on BA degradation by UV/PMS was inhibited completely by phosphate ion but partially by oxalate.However,the degradation efficiency of BA by UV/PMS/Fe3 + in the presence of oxalate was still higher than that by UV/PMS,The results above indicated that the couple of UV/PMS and iron might be a feasible method to enhance the decontamination efficiency in the application.