摘要
研究了水热处理稻壳对Cr(Ⅵ)的吸附特性,比较了不同水热时间处理稻壳对Cr(Ⅵ)的吸附,结果表明:水热处理4 h的稻壳去除Cr(Ⅵ)效果最好,在相同条件下吸附量几乎是未处理稻壳的4倍;对水热处理前后的稻壳做了热重和FTIR分析,表明水热处理使稻壳中活性羟基发生脱水缩聚;考察了溶液的pH值、吸附时间、温度、初始浓度等因素对Cr(Ⅵ)吸附的影响,结果表明:吸附量随pH值降低、初始浓度增加、温度升高及吸附时间延长而增加,水热处理后稻壳对Cr(Ⅵ)的吸附符合Freundlich模型.
The adsorption properties of Cr（Ⅵ） on hydrothermal treated rice husks were investigated and the adsorption capacities of rice husks with series treatment time were compared.The results showed that the rice husk with 4 hours treatment exhibited the best adsorption capacity,being four times that of raw rice husk.Thermogravimetric analysis and Fourier transform infrared spectroscopy of the series rice husks demonstrated that the active hydroxy group on rice husk dehydrated and condensed after the hydrothermal treatment.The effects of pH,contact time,initial concentration and temperature on the adsorption capacity were investigated,showing that the adsorption capacity increased with pH decreasing,temperature increasing,initial concentration increasing and contact time increasing,and the Freundlich adsorption isothermal model was well fitted.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2011年第6期9-12,17,共5页
Journal of Zhengzhou University（Engineering Science）
基金
河南省重点科技攻关资助项目(08110091180)
关键词
稻壳
水热处理
Cr(Ⅵ)
吸附
rice husk
hydrothermal treatment
Cr（Ⅵ）
adsorption
