摘要
以苯酚为目标污染物,高粱秸秆生物炭(S-BC)作为催化剂研究其活化过硫酸盐(PS)降解苯酚的效果.对影响降解的因素(包括PS浓度、S-BC质量浓度、初始pH值以及自由基清除剂)进行探讨,同时研究了生物炭的重复使用效果.研究结果表明,S-BC/PS体系对苯酚的去除率显著高于单一S-BC和PS体系.在n(PS):n(phenol)为50:1,S-BC质量浓度为1.5g/L,pH值为11的条件下,15h内苯酚的去除率高达99.7%;自由基清除剂(叔丁醇(TBA),甲醇(MeOH))测定×OH和SO_4^-×是苯酚降解的主要活性物种;S-BC重复使用4次时对苯酚的去除率仍能达到100%.综上所述,生物炭可作为一种高效催化剂活化过硫酸盐降解苯酚.
Persulfate(PS)oxidative degradation of phenol in an aqueous solution was studied in the presence of sorghum-straw biochar(S-BC).The effects of critical parameters,including sodium persulfate(PS)concentration,dose of catalyst,and the initial pH,were investigated.The results show that the ratio of phenol degradation in S-BC/PS system is obviously better than those of single S-BC and PS.The maximum removal efficiency of phenol reached 99.7%with PS/phenol molar ratio of 50:1,S-BC dosage of 1.5g/L,initial pH of 11and reaction time of 15h.Radical mechanism was studied and two radical scavengers(methanol(MA),tert-butanol(TBA))were used to determine the kind of major active species taking part in the degradation of phenol.Finally,the recovery performance of S-BC was studied through the S-BC reuse experiments.In summary,the method of activating PS with S-BC may offer great benefits in remediation of phenol-contaminated water.
作者
姚淑华
马锡春
李士凤
YAO Shu-Hua;MA Xi-Chun;LI Shi-Feng(Liaoning Engineering Research Center for Treatment and Recycling of Industrially Discharged Heavy Metals,Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第11期4166-4172,共7页
China Environmental Science
基金
国家重点研发计划专项项目(2017YFD0800301)
国家自然科学基金面上项目(41373127),辽宁省教育厅科研项目(LQ2017012).
关键词
秸秆生物炭
降解
活化
过硫酸盐
苯酚
straw biochar
degradation
activation
persulfate
phenol
