摘要
以粉碎松树枝粉末为原料高温热解制备生物炭,然后采用水热方法与Fe3O4和壳聚糖复合,制备复合吸附剂,并将其用于水中Cu(Ⅱ)的吸附去除。研究发现复合吸附剂可有效去除Cu(Ⅱ),反应1.5h后可达到吸附平衡,其最大平衡吸附量为74.83mg·g-1。对其吸附机理研究表明,Cu(Ⅱ)在复合吸附剂表面的吸附过程包括表面扩散、颗粒内部扩散和吸附平衡扩散三个阶段,其吸附反应动力学可采用准二级反应动力学方程拟合,吸附等温线符合Langmuir模型。对其反应热力学研究表明Cu(Ⅱ)在复合生物炭表面的吸附主要为物理吸附。
The biochar was prepared by using thermal decomposition of powders obtained by pulverizing the pine branch,which was then combined with both magnetic Fe3 O4 and chitosan to form the composite adsorbent.It has been used for Cu(Ⅱ)removal from aqueous solution.There were three steps in the endothermic adsorption process,including the surface diffusion,the intraparticle diffusion and the final equilibrium.The maximum adsorption capacity was 74.83 mg·g-1 at the equilibrium time of 90 min.The investigations on adsorption kinetics and isotherms showed that the pseudo-second-order kinetic and Langmuir isotherm model could well fit the experimental data.Further investigations on the activation energy and thermodynamics of the adsorption process elucidated that the Cu(Ⅱ)adsorption on the adsorbent was an endothermic and spontaneous physi-sorption process.
出处
《青岛科技大学学报（自然科学版）》
CAS
2018年第2期16-20,共5页
Journal of Qingdao University of Science and Technology:Natural Science Edition
基金
国家自然科学基金项目(41573103)
