三价铁改性活性炭对水中微量砷的吸附特性  

Adsorption properties of low concentration arsenic in water by modified activated carbon with ferric iron

作　　者：曹秉帝 徐绪筝[2,3] 王东升[2] 徐文博[4] 王新[2] 曹晨[2] 

机构地区：[1]西安建筑科技大学市政与环境工程学院,西安710055 [2]中国科学院生态环境研究中心,环境水质学国家重点实验室,北京100085 [3]北京环球中科水务科技有限公司,北京100085 [4]中国航天建设集团有限公司,北京100071

出　　处：《环境工程学报》2016年第5期2321-2328,共8页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理科技重大专项(2011ZX07415-001);国家高技术研究发展计划(863)项目(2013AA065602)

摘　　要：研究了三价铁改性对不同活性炭(颗粒和粉末)对水中砷的吸附特性的影响。结果表明,三价铁改性有效提高了活性炭对不同形态砷的吸附性能。其中,对于2种活性炭,As(Ⅲ)和As(Ⅴ)的最佳铁离子改性浓度分别为0.1和0.05 mol/L。此时,通过Langmuir等温线方程拟合得到:粉末和颗粒活性炭对As(Ⅲ)的最大吸附量qm分别为2.38 mg/g和9.39 mg/g;而对As(Ⅴ)的qm分别为5.12 mg/g和2.32 mg/g。此外,当溶液的p H从3升高到9的过程中,吸附量先增加后有所下降,当p H为7时,改性前后的活性炭对砷的吸附量达到最高。In this study, the effect of ferric modification on the adsorption properties of different forms of activated carbon （granular and powdered） was investigated. The results showed that the adsorption capacity of activated carbon for arsenate with different speeiations was effectively improved with ferric modification. For both forms of activated carbons, the optimal ferric concentrations for modification were 0.1 mol/L for As（Ⅲ ） and 0.05 mol/L for As（ Ⅴ ）. At the same time, Langmuir isotherm equation fitting results indicated that the maxi- mum adsorption capacities （qm） were 2.38 mg/g and 9.39 mg/g for As（Ⅲ ） and 2.32 mg/g and 5.12 mg/g for As（ V ） with powdered activated carbon （PAC） and granular activated carbon （GAC） , respectively. In addi- tion, when the solution pH increased from 3 to 9, the adsorption capacity increased initially and then decreased slightly later; the maximum adsorption capacity can be achieved at pH of 7.

关 键 词：活性炭 砷 改性 三价铁 吸附 

分 类 号：X703[环境科学与工程—环境工程]