化学改性铝污泥强化Cu^(2+)的吸附

Enhanced adsorption of the Cu^(2+) by chemically modified aluminum sludge

以净水厂铝污泥(AlS)为主要原料,依次经过铁盐浸渍和壳聚糖(CS)包覆,制得复合吸附剂AlS-Fe-CS,研究其对Cu^(2+)的吸附。结果表明,化学改性后,铁(氢)氧化物和CS复合在铝污泥上;最优吸附pH为5.5,吸附平衡时间为20 h,对Cu^(2+)的最大吸附量为72.36 mg/g,相比纯AlS性能提高了约1倍,且温度升高有利于吸附反应的进行;吸附过程符合拟二级动力学和Freundlich吸附等温线。

The composite adsorbent AlS-Fe-CS was obtained from the aluminum sludge(AlS) of the water purification plant,which was successively immersed in iron salt solution and coated with chitosan(CS),and the adsorption characteristics of Cu^2+ were studied.The results showed that the iron(hydr)oxide and CS were successfully compounded on the AlS after the chemical modification;The optimum adsorption pH was 5.5,the adsorption equilibrium time was 20 h,the maximum adsorption capacity of modified AlS-Fe-CS for Cu^2+ removal in the experimental concentration range was 72.36 mg/g,which was twice higher than pure AlS,and increasing temperature was conducive to the adsorption;the adsorption process conformed to the pseudo-second-order kinetics model and the Freundlich adsorption isotherm model.