切割钢渣活化过硫酸盐降解偶氮类染料酸性红73  

Degradation of acid red 73 by persulfate activated by steel slag

作　　者：郭婧怡 马扬帆 杨绍贵 曹可欣 吴洁 高晨曦 何欢 李时银 GUO Jingyi;MA Yangfan;YANG Shaogui;CAO Kexin;WU Jie;GAO Chenxi;HE Huan;LI Shiyin(School of Environment,Nanjing Normal University,Nanjing 210023)

机构地区：[1]南京师范大学环境学院

出　　处：《环境科学学报》2019年第8期2550-2558,共9页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金面上项目(No.21777067);南京师范大学2018年大学生创新创业训练项目;“六大人才高峰”高层次人才项目(No.JNHB-105)

摘　　要：切割钢渣是钢铁生产过程中的固体废弃物,如何有效处理和利用这些废渣具有减少环境污染、实现废物资源化的重要意义.本文选择河北邢台钢铁厂中切割钢渣为过硫酸盐(PS)活化剂,活化过硫酸盐(PS)去除水相中偶氮染料酸性红73(AR73),实验表明,25mg·L^-1AR73在15min内,其降解率为99.9%,TOC矿化率达58.6%.同时考察了钢渣投入量、PS浓度、初始pH值等影响因素对AR73降解效率的影响:随着PS浓度、钢渣投入量的增加,AR73的降解速率也逐渐增加;在pH为3~9时,AR73均可被有效去除,酸性条件更有利于AR73的去除.活性自由基猝灭实验表明,酸性红73的降解是通过自由基和非自由基两种机制实现的,且钢渣可多次回收重复利用.钢渣活化PS技术,还可有效去除蒽醌类染料(活性蓝19),其去除率为99.9%,矿化率可达92.0%;同时该技术对某印染废水(CODCr=5625mg·L^-1)的去除率达49.9%.本文所构建的切割钢渣活化过硫酸盐(PS)技术可应用于偶氮印染废水的处理,实现“以废治废”的目标.steel slag is a kind of solid waste generated in the steel cutting process.It was chosen as an activator to activate persulfate(PS)to degrade an azo dye,acid red 73(AR73),in aqueous solutions.The results indicate that 99.9%removal of 25 mg·L^-1 AR73 was achieved within 15 minutes,and TOC mineralization efficiency was 58.6%.Results also show that the removal of AR73 increased with increasing PS dosage and steel slag loading.Effective removal could be achieved in solutions in a wide pH range,varying from 3 to 9,and low pH was more favorable.The radicals quenching experiment illustrates that radical and non?radical mechanisms play a joint role in the degradation of acid red 73(AR73).After 6 cycles of operation,steel slag still maintained high stability.99.9%removal and 92.0%mineralization of the anthraquinone dye(reactive blue 19)were obtained in the steel slag?persulfate system,which also used to mineralize 49.9%of real dye wastewater.The Steel slag?persulfate system built in this study is potential for treating azo dye wastewater.

关 键 词：切割钢渣 过硫酸盐 偶氮染料 降解 

分 类 号：X703[环境科学与工程—环境工程]