CAJ | 학술논문

以柠檬酸(CA)络合亚铁离子 CA-Fe(Ⅱ)为活化剂,活化过硫酸盐(S2O82-,PS)产生强氧化剂硫酸根自由基(SO4·-),进而催化氧化苯酚.从CA/Fe(Ⅱ)物质的量比、Fe(Ⅱ)浓度、过硫酸盐(PS)投加量和苯酚初始浓度4个因素来考察络合亚铁离子活化过硫酸盐氧化去除苯酚的动力学.结果表明,随着 PS 投加量的增加,苯酚的去除率随之提高;但随着苯酚初始浓度的增加,去除率逐渐降低;CA/Fe(Ⅱ)物质的量比为 1/5 时,能够保持水溶液中足量的亚铁离子,有利于苯酚的氧化去除;当 PS/CA/Fe(Ⅱ)/苯酚物质的量比为 100/10/50/1 时,苯酚的去除率最高,反应15min后去除率达到98%,此时,苯酚的氧化反应速率k也达到最高值0.430min-1.活化过硫酸盐氧化去除苯酚的过程基本符合准一级动力学,在CA/Fe(Ⅱ)/苯酚物质的量比为10/50/1条件下,苯酚氧化反应速率与过硫酸盐投加量呈线性正相关(R2 = 0.953).
이저몽산(CA)락합아철리자 CA-Fe(Ⅱ)위활화제,활화과류산염(S2O82-,PS)산생강양화제류산근자유기(SO4·-),진이최화양화분분.종CA/Fe(Ⅱ)물질적량비、Fe(Ⅱ)농도、과류산염(PS)투가량화분분초시농도4개인소래고찰락합아철리자활화과류산염양화거제분분적동역학.결과표명,수착 PS 투가량적증가,분분적거제솔수지제고;단수착분분초시농도적증가,거제솔축점강저;CA/Fe(Ⅱ)물질적량비위 1/5 시,능구보지수용액중족량적아철리자,유리우분분적양화거제;당 PS/CA/Fe(Ⅱ)/분분물질적량비위 100/10/50/1 시,분분적거제솔최고,반응15min후거제솔체도98%,차시,분분적양화반응속솔k야체도최고치0.430min-1.활화과류산염양화거제분분적과정기본부합준일급동역학,재CA/Fe(Ⅱ)/분분물질적량비위10/50/1조건하,분분양화반응속솔여과류산염투가량정선성정상관(R2 = 0.953).
The phenol oxidation by sulfate free radical (SO4·-) formed in the activation of persulfate by citric acid chelated ferrous ion (CA-Fe(Ⅱ)) was investigated in this study. The influence of different factors, such as CA/Fe(Ⅱ) molar ratio, Fe(Ⅱ) concentration, initial S2O82- molar amount and phenol concentration on the kinetics of phenol oxidation by chelated Fe(Ⅱ) activated persulfate was described in detail. Results indicated that the removal efficiency of phenol was significantly increased with increasing persulfate dosage, but decreased with increasing initial phenol concentration. A CA/Fe (Ⅱ) molar ratio of 1/5contributed to phenol removal on maintaining sufficient quantities of available Fe (Ⅱ) in solution. The highest phenol removal (98%) can be obtained within a 15min with the PS/CA/Fe (Ⅱ)/phenol molar ratio of 100/10/50/1 and the highest oxidation rate (0.430min-1) was gained. The phenol oxidation by chelated ferrous ion activated persulfate followed the pseudo-first-order kinetics reaction. With the CA/Fe(Ⅱ)/phenol molar ratio of 10/50/1, the phenol oxidation rate constant exhibited a linear trend as a function of initial persulfate concentration,R2 = 0.953.