交联壳聚糖珠吸附活性染料的动力学研究  

Kinetics study of reactive dyes adsorption by crosslinked chitosan beads

作　　者：唐志儒[1] 陈一[1] 闻岳[1] 周琪[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境工程学报》2012年第9期3007-3010,共4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(2008ZX07316)

摘　　要：利用交联剂环氧氯丙烷(ECH)对壳聚糖进行改性,制备了交联壳聚糖珠,对活性染料(活性艳蓝ST-RV)的脱色性能进行了研究。分别从起始染料浓度(100～200 g/cm3)、温度(30～50℃)以及pH(7～9)考察了对染料吸附的动力学影响。当起始染料浓度为200 g/cm3,温度30℃,pH=7时,交联壳聚糖珠对ST-RV的吸附量达到77.49 mg/g。用准一级和二级动力学模型描述了动力学数据并确定了速率常数,最后进行了交联壳聚糖珠的再生实验。结果表明,吸附数据符合二级动力学模型;当pH=10时,交联壳聚糖珠可少量解吸。The modified chitosan beads were prepared by the cross-linking agent epichlorohydrin（ECH）.The effects of initial dye concentration（100-200 g/cm3）,temperature（30-50℃） and pH（7-9） on reactive cobalt blue ST-RV adsorption were investigated.The maximum adsorption capacity was found to be 77.49 mg/g at pH 7,with initial dye concentration of 200 g/cm3 at 30℃.The pseudo-first-order and second-order kinetic models were used to describe the kinetics and the rate constants.The results show that the adsorption data can fit the pseudo-second-order kinetic model.A small amount of cross-linked chitosan beads can be regenerated at pH=10.

关 键 词：壳聚糖 交联剂 活性染料 吸附动力学 解吸 

分 类 号：X788[环境科学与工程—环境工程]