改性玉米秸秆对水中砷的吸附  

Adsorption of arsenic in water by modified corn straw

作　　者：范荣桂[1] 姜清凤 张世强[1] 郜秋平[1] 

机构地区：[1]辽宁工程技术大学环境科学与工程学院,阜新123000

出　　处：《环境工程学报》2015年第11期5493-5498,共6页Chinese Journal of Environmental Engineering

摘　　要：以玉米秸秆做原材料,筛选出异丙醇-氢氧化钠-草酸作改性剂,利用改性后的玉米秸秆吸附水体中的三价砷;探讨了其吸附过程的热力学和动力学行为;研究了p H及吸附剂量对吸附效果的影响。实验结果表明,改性玉米秸秆对水中砷具有很好的吸附能力,当进水浓度为1.25 mg/L、吸附剂投加量为0.25 g、温度为25℃、p H值为9时,60 min达到吸附饱和;在此条件下,改性玉米秸秆对三价砷的吸附去除率为94.28%;吸附过程符合准二级动力学方程,等温吸附规律能够同时满足Langmuir和Freundlich吸附等温吸附模型。The adsorption experiment of trivalent arsenic（ As（ Ⅲ）） in water was studied,and the modified corn straw for adsorbent was used. The isopropyl alcohol-sodium hydroxide-oxalic acid was selected as modifier and the original corn straw was used. The thermodynamics and kinetics of the adsorption process were investigated. The effects of p H and adsorbent dosage on the adsorption efficiency were discussed. The experimental results showed that modified corn straw had highly adsorption capacity for arsenic in water. The adsorption capacity of the modified corn straw for the arsenic（ As（ Ⅲ）） could be saturated until sixty minute,the initial concentration,adsorbent dosage,temperature and p H value were 1. 25 mg / L,0. 25 g,25℃ and 9,respectively. Under the above conditions,the removal efficiency of arsenic（ As（ Ⅲ）） in water was about 94. 28%. The kinetics of adsorption process fitted in with pseudo second order reaction. The adsorption isotherm could also simultaneously satisfy both isotherm model of Langmuir and Freundlich.

关 键 词：玉米秸秆 改性 吸附 砷 

分 类 号：X703[环境科学与工程—环境工程]