挺水植物秸秆对溶液中Cu^(2+)的吸附研究  

Study on Adsorption of Cu^(2+)in Solution by Emergent Aquatic Plant Straw

作　　者：包坤 刘昱镔 张文倩 BAO Kun;LIU Yubin;ZHANG Wenqian(School of New Materials and Chemical Engineering,Tangshan University,Tangshan 063000,China;Tangshan Key Laboratory of Water Environment Treatment and Water Ecological Restoration,Tangshan University,Tangshan 063000,China)

机构地区：[1]唐山学院新材料与化学工程学院,河北唐山063000 [2]唐山学院唐山市水环境治理与水生态修复重点实验室,河北唐山063000

出　　处：《唐山学院学报》2024年第6期1-9,33,共10页Journal of Tangshan University

摘　　要：以挺水植物秸秆(芦苇和香蒲)为原料制备吸附剂,考察吸附剂的用量(g)、溶液pH值和吸附时间(min)对溶液中Cu^(2+)吸附性能的影响,并对其等温吸附特征、吸附动力学和吸附热力学进行研究.结果表明:当吸附剂用量为0.15g,pH值为60时,对溶液中的Cu^(2+)具有很好的去除率,在240min时达到吸附平衡;吸附过程同时符合Langmuir和Freundlich等温吸附模型以及Lagergren准二级动力学模型,且颗粒内扩散阶段不是吸附过程的控速关键阶段;热力学参数△G^(0)<0,△H^(0)>0和△S^(0)>0表明吸附过程为自发、吸热和熵增的过程,对溶液中的Cu^(2+)均具有较好的亲和力;相同条件下,两种吸附剂对Cu^(2+)的吸附效果表现为香蒲>芦苇.Adsorbents were prepared from emergent aquatic plant straws(reed and cattail),and then the effects of adsorbent dosage(g),solution pH and adsorption time(min)on the adsorption performance of Cu^(2+)in the solution were investigated,and its isothermal adsorption characteristics,adsorption kinetics and adsorption thermodynamics were studied.The results show that an optimal Cu^(2+)removal efficiency is achieved when the adsorbent dosage is 0.15 g and the pH value is 6.0,with adsorption equilibrium reached at 240 min;The adsorption process adheres to both the Langmuir and Freundlich isothermal adsorption models,as well as to the pseudo second-order kinetic model,and the intraparticle diffusion stage is not the key rate-controlling stage in the adsorption process;The thermodynamic parameters(△G^(0)<0,△H^(0)>0 and △S^(0)>0)indicate that the adsorption process is spontaneous,endothermic and entropy-increasing,and has a relatively strong affinity for Cu^(2+)in the solution;Under identical conditions,the adsorption efficiency of Cu^(2+)by the two adsorbents follows the order:cattail>reed.

关 键 词：芦苇 香蒲 吸附剂 等温吸附 动力学 热力学 

分 类 号：O647.314[理学—物理化学]