羟基氧化铝吸附去除六价铬  

Adsorption of chromium(Ⅵ) by aluminum oxyhydroxide

作　　者：聂兰玉 陈海[1] 白智勇[1] 刘伟[1] 杨琦[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院水资源与环境工程重点实验室,北京100083

出　　处：《环境工程学报》2015年第8期3847-3853,共7页Chinese Journal of Environmental Engineering

基　　金：北京市产学研项目(51900265005);国家"水体污染控制与治理"科技重大专项(2009ZX07207-008;2009ZX07419-002;2009ZX07207-001;2015ZX07406005);中央高校基本科研业务费专项资金(2652013101;2652013086;2652013087;2652015118;2652015005;2652015006);重点防控重金属汞;铬;铅;镉;砷便携/车载/在线监测仪器开发与应用示范项目(2012YQ060115)

摘　　要：以水合氧化铝和氢氧化铝聚团微球作为前躯体制备羟基氧化铝,并研究自制羟基氧化铝对水中六价铬的吸附性能。实验考察了吸附过程中溶液pH、羟基氧化铝投加量、吸附时间、温度以及离子强度对吸附效果的影响。研究结果表明,在pH=7,温度25℃,吸附剂剂量为2 g/L、初始浓度为10 mg/L的六价铬最大去除率为97.6%,吸附平衡时间为60min。同时羟基氧化铝吸附六价铬的吸附符合Freundlich和Temkin吸附模型,吸附动力学适合伪二级动力学模型。Aluminum oxyhydroxide was synthesized with hydrated alumina and aluminum hydroxide micro- spheres. Batch experiment was conducted to remove chromium （VI） from water using synthetic aluminum oxy- hydroxide as adsorbent. Parameters affecting the adsorption were studied, including pH, dosage of aluminum oxyhydroxide, equilibrium contact time, temperature and ionic strength. Results showed that when initial Cr （VI） concentration and dosage of aluminum oxyhydroxide were 10 mg/L and 2 g/L, respectively, the maximum removal rate of Cr（ VI ） was 97.6% at pH =7 and 25℃ , and an equilibrium time of 60 min. And the adsorption equilibrium data fitted very well to the Freundlich and Temkin isotherm. The adsorption kinetics was found to fol- low the pseudo-second-order kinetic model.

关 键 词：羟基氧化铝 六价铬 吸附 

分 类 号：X703[环境科学与工程—环境工程]