改性生物炭活化过硫酸盐对水中苯和氯苯的去除机制  

Removal mechanism of benzene and chlorobenzene in water by modified biochar activates persulfate

作　　者：郭明帅 王菲[2] 张学良 徐建 GUO Ming-shuai;WANG Fei;ZHANG Xue-liang;XU Jian(Nanjing Institute of Environmental Sciences,Ministry of Ecological Environment,Nanjing 210042,China;Institute of Geotechnical Engineering,School of Transportation,Southeast University,Nanjing 211189,China)

机构地区：[1]生态环境部南京环境科学研究所,江苏南京210042 [2]东南大学交通学院,岩土工程研究所,江苏南京211189

出　　处：《中国环境科学》2020年第12期5280-5289,共10页China Environmental Science

基　　金：中央级公益性科研院所基本科研业务专项(土壤生态环境领域研究报告)。

摘　　要：采用传统的液相沉淀法合成铁盐改性花生壳生物炭(Fe-BC),将其作为活化过硫酸盐(PS)的活化剂用于去除水体中的苯和氯苯.通过扫描电子显微镜、X射线衍射、傅里叶变换红外光谱、Boehm滴定法和BET测量对合成材料的结构和形态进行了表征,研究了pH值和水中阴离子对反应体系的影响以及材料的再利用性能.结果表明,在Fe-BC/PS体系中,反应3h后苯和氯苯的去除率均高达100%.Fe-BC/PS去除苯和氯苯协同机制包括BC的吸附、自由基的氧化等.在中性及酸性溶液中,苯和氯苯的去除率均能够达到100%.水中常见阴离子对反应体系具有不同程度的抑制作用,抑制强度依次为HCO3^->HPO4^->Cl^->NO3^-.Fe-BC材料具有良好的再利用性能,是一种高效、廉价的PS活化剂.Iron salt-modified peanut shell biochar(Fe-BC)was synthesized by the traditional liquid-phase precipitation method and used as an activator for activating persulfate(PS)to promote the removal of benzene and chlorobenzene.The structure and morphology of the synthesized materials were characterized by scanning electron microscope,X-ray diffraction,Fourier transform infrared spectroscopy,Boehm titration(1994)and BET measurement.The effects of pH and anions in water on the reaction system and the re-use properties of the materials were also studied.The results demonstrated that in the Fe-BC/PS system,the removal rates of benzene and chlorobenzene were as high as 100%after 3hours.The synergistic mechanism of Fe-BC/PS to remove benzene and chlorobenzene included BC adsorption and free radical oxidation.In addition,under neutral and acidic environment,the removal rates of benzene and chlorobenzene can be as high as 100%.Common anions in water inhibited the degradation of benzene and chlorobenzene in various degrees,and the inhibition intensity was in the order of HCO3^->HPO4^->Cl^->NO3^-.To sum up,Fe-BC material has good recycling performance and was an efficient and cheap PS activator.

关 键 词：改性生物炭 过硫酸盐 苯和氯苯 Fe-BC/PS 

分 类 号：X703.5[环境科学与工程—环境工程]