端氨基树枝状聚合物吸附Cr(Ⅵ)后的解吸性能研究  

Desorption properties of amine-terminated dendritic polymer after adsorbing hexavalent chromium

作　　者：步巧巧[1] 赵静[2] 任龙芳[2] 王学川[2] 董慧峰[1] 

机构地区：[1]中国皮革和制鞋工业研究院,北京100016 [2]陕西科技大学轻工科学与工程学院,陕西西安710021

出　　处：《中国皮革》2017年第4期24-30,共7页China Leather

摘　　要：以乙二胺(EDA)和三聚氰氯(CNC)为原料,通过控制反应条件使之发生分步取代反应制备出三代的端氨基树枝状聚合物(ADP-3),在ADP-3最佳吸附条件(p H值为2,温度为45℃,时间为3h)下吸附处理浓度为100mg/L的Cr(Ⅵ)溶液,吸附后对其解吸性能进行研究。通过单因素试验方法确定出最佳解吸剂为氢氧化钠,最佳解吸条件为:p H值12,解吸时间4h,解吸温度40℃。解吸动力学研究表明:拟二级动力学模型能够很好地描述该解吸行为。5次吸附/解吸循环试验后,Cr(Ⅵ)的吸附率/解吸率下降约5%,该吸附材料具有优良的可重复利用性能。With ethylenediamine （EDA） and cyanuric chloride （CNC） .as raw materials, the 3rd generation of dendritic polymers with terminal amino （ADP-3） was obtained by step-by-step substitution reaction. The prepared ADP-3 was used as adsorbing material to adsorb the Cr（ Ⅵ） solution with the concentration of 100mg/L under the optimum adsorption conditions（ pH = 2,T = 45℃, t = 3h ）, and the desorption property of the ADP-3 after adsorbing Cr（ Ⅵ ） was studied. The optimum desorption reagent is sodium hydroxide defined by single factor experiment, the optimum desorption pH value is 12, desorption time is 4h, desorption temperature is 40℃. Desorption kinetic experiments show that the pseudo-second-order kinetic model can well describe the desorption behavior of the ADP-3 after absorbing Cr（Ⅵ）. The adsorption and desorption rate of Cr（Ⅵ） decline about 5% after five times adsorption/desorption cycle experiments. It indicates that the adsorption material has excellent recycle performance.

关 键 词：端氨基树枝状聚合物 Cr(Ⅵ) 解吸性能 动力学 可重复利用性 

分 类 号：X703[环境科学与工程—环境工程]