褐藻海带生物质残渣对水中Pd(Ⅱ)的吸附研究  

Adsorption of Pd(Ⅱ) from Aqueous Solution by the Biomass Residue of Brown Alga Laminaria Japonica

作　　者：邵华森 李耀威[1] 陈提先 刘健[1] 

机构地区：[1]华南师范大学化学与环境学院广东省水环境生态治理与修复工程技术研究中心,广州510006

出　　处：《华南师范大学学报（自然科学版）》2017年第4期45-50,共6页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(21006037)

摘　　要：用乙醇处理褐藻海带得到生物质残渣(Residue of Laminaria Japonica,ROLJ),探讨了ROLJ对水溶液中钯离子Pd(Ⅱ)的吸附性能.考察了溶液pH、接触时间、温度和初始Pd(Ⅱ)质量浓度等因素对吸附效果的影响,并探讨了ROLJ对Pd(Ⅱ)的吸附动力学及等温吸附特性.结果表明:在pH为3~4范围内,吸附效果最好;吸附平衡时间为80 min;吸附动力学符合伪二级动力学模型;Langmuir等温吸附方程能较好地描述Pd(Ⅱ)在ROLJ上的吸附特性,303 K时ROLJ对Pd(Ⅱ)静态饱和吸附容量为294.12 mg/g.热力学分析结果表明,ROLJ对Pd(Ⅱ)的吸附反应是自发、吸热和熵值增加的过程.用0.1 mol/L HCl+5%硫脲溶液可洗脱回收Pd(Ⅱ),ROLJ是一种有应用前景的钯吸附回收材料.The biomass residue of Laminaria japonica （namely ROLJ） was prepared by treating Laminaria japonica with ethanol.The adsorption property of ROLJ for Pd（Ⅱ） from aqueous solution was investigated.The effects of various parameters such as the initial pH, contact time, temperature and initial metal ion concentration on the adsorption efficiency of Pd（Ⅱ） were studied.The experimental results showed that the optimum adsorption pH of ROLJ for Pd（Ⅱ） was 3-4, the adsorption equilibrium time was 80 min.The adsorption of Pd （Ⅱ） on the ROLJ was found to follow the pseudo second order kinetics equation and agree well with Langmuir adsorption isotherm model.Thermodynamic parameters indicated that the adsorption was spontaneous, endothermic accompanied by increase in entropy under the experimental conditions.The recovery of Pd （Ⅱ） was eluted with 0.1 mol/L HCl＋5% thiourea solution.The results indicated that ROLJ is a promising material for recovery of palladium.

关 键 词：海带 生物质残渣 Pd(Ⅱ) 吸附 

分 类 号：O647.32[理学—物理化学] X703[理学—化学]