CAJ | 학술논문

采用高级氧化技术,以Co2+为催化剂分解单过氧硫酸氢钾(PMS)所产生的强氧化性硫酸根自由基(SO4·-)降解水中的二氯喹啉酸(QC).考察了PMS用量、Co(Ⅱ)/PMS比值和Cl-浓度以及QC初始浓度对该均相Co(Ⅱ)/PMS体系降解QC的影响.结果表明,QC的降解遵循准一级动力学过程.当QC初始浓度在0.02~0.2mmol/L时,QC的降解速率随着QC/PMS比值的降低而增大,但当QC/PMS比值小于1/100时,则相反.QC的降解速率随着PMS浓度升高而线性增大,当PMS浓度为32mmol/L时,4h内QC的降解率可达94%.增大Co(Ⅱ)/PMS的摩尔比能够促进QC的降解,而Cl-对QC的降解有一定的抑制作用.LC/MS分析结果表明,3,7-二氯-8-羟基喹啉和7-氯-8-喹啉甲醛为QC降解过程中两种主要的中间产物.
채용고급양화기술,이Co2+위최화제분해단과양류산경갑(PMS)소산생적강양화성류산근자유기(SO4·-)강해수중적이록규람산(QC).고찰료PMS용량、Co(Ⅱ)/PMS비치화Cl-농도이급QC초시농도대해균상Co(Ⅱ)/PMS체계강해QC적영향.결과표명,QC적강해준순준일급동역학과정.당QC초시농도재0.02~0.2mmol/L시,QC적강해속솔수착QC/PMS비치적강저이증대,단당QC/PMS비치소우1/100시,칙상반.QC적강해속솔수착PMS농도승고이선성증대,당PMS농도위32mmol/L시,4h내QC적강해솔가체94%.증대Co(Ⅱ)/PMS적마이비능구촉진QC적강해,이Cl-대QC적강해유일정적억제작용.LC/MS분석결과표명,3,7-이록-8-간기규람화7-록-8-규람갑철위QC강해과정중량충주요적중간산물.
An effective advanced oxidation process for the degradation of quinclorac (QC) in water is reported. This method is based on the oxidation of quinclorac by sulfate radicals generated from the decomposition of peroxymonosulfate (PMS) mediated by Co (Ⅱ) ion in the aqueous phase. The effects of the concentration of PMS and Cl-, molar ratio of Co (Ⅱ)/PMS as well as the initial concentration of QC on the degradation efficiency of QC were examined. The results showed that the degradation of QC in the homogeneous Co (Ⅱ)/PMS system fitted well to the pseudo-first-order kinetic model. The degradation rate of QC increased with the decreasing of molar ratio of QC/PMS, but declined as the ratio of QC/PMS lower than 1/100 when the initial concentration of QC was in the range of 0.02~0.2mmol/L. The reaction rates linearly increased with the increase of PMS concentration with a QC decomposition as high as 94% within 4 hours at an initial concentration of 32mmol/L PMS. The ratio of Co (Ⅱ)/PMS had positive effect on the degradation of QC, while Cl- had negative impact. The results of LC/MS analysis indicated that 3,7-dichloro-8-hydroxy quinoline and 7-chloro-8-quinoline carboxaldehyde were the two major intermediates of QC degradation.