环境保护科学2016，Vol.42Issue(4)：120-125,6.DOI:10.16803/j.cnki.issn.1004-6216.2016.04.025
改性聚乙烯醇吸附镍离子的动力学与热力学研究
2+Kinetics and Thermodynamics of Adsorption of Ni by Modified Polyvinyl Alcohol
摘要
Abstract
2+In this paper, adsorption behavior of Ni by self-made modified polyvinyl alcohol was studied by use of batch technique under different conditions. Fitting of kinetics and thermodynamics of the adsorption process was carried out with regard to the testing data. The results showed that at room temperature, when pH of the solution was 6.0, concentration of NaNO was 0.13 mol/L, adsorption time was 60 min, and liquid/solid ratio was 250 mL/g, adsorption effects of the modified polyvinyl alcohol on Ni were good, with removal efficiency reaching to 98.05%. When the interference factor was Ca (NO ) 0.1 mol/L instead of NaNO , the3 2 3 2+2+removal rate of Ni was reduced to 59.29%. Adsorption of Ni by modified PVA complied with the pseudo-second-order kinetic model well. The fitting level of Langmuir isothermal model was highest and the surface of the modified PVA was regarded as homogeneous plasmid. The calculated maximal adsorption amount was 1.35 mmol/g, consistent with the testing results. The fitting degree of D-R isotherm model was the secondly highest. At different temperature, adsorption energy E was more than 16kJ/mol, 2+indicating that the adsorption of Ni2+ was mainly based on chemisorption process. By fitting of Van’t Hoff equation, thermodynamic parameters such as the calculated Gibbs free energy, entropy and enthalpy indicated that the adsorption process was endothermic chemisorption process.关键词
聚乙烯醇/改性/Ni2+/吸附/动力学/热力学Key words
2+Polyvinyl Alcohol/Modified/Ni/Adsorption/Kinetics/Thermodynamics分类
资源环境引用本文复制引用
江海燕,曾英,赵秋香..改性聚乙烯醇吸附镍离子的动力学与热力学研究[J].环境保护科学,2016,42(4):120-125,6.基金项目
广东省省级科技计划项目-社会发展领域科技计划（2013B020800006）基金资助 （）
