环境工程学报2017，Vol.11Issue(7)：4059-4066,8.DOI:10.12030/j.cjee.201604165
自燃煤矸石吸附磷的动力学和热力学
Kinetic and thermodynamic study of phosphate adsorption by Spontaneous combustion coal gangue
摘要
Abstract
Spontaneous combustion coal gangue has good adsorption ability for removing phosphate in aqueous solution.The adsorption of phosphate by spontaneous combustion coal gangue was therefore studied.The influences of adsorption time,initial concentration of phosphate solutions,and temperature on the adsorption of phosphate were observed.The results indicate that the maximum adsorption of phosphate was 7.07 mg · g-1,the phosphate adsorption equilibrium was attained after 120 h,and the adsorption process was well-fitted to a Lang muir adsorption isotherm when the temperature was 298 K.The study of adsorption kinetics shows that it was also well-fitted to the patterns of pseudo second-order and particle diffusion models,indicating the coexistence of chemical adsorption and physical adsorption in the adsorption process.Thermodynamic parameters-ΔG:(-10.52,-11.74,-14.89)kJ · mol-1,ΔH:46.96 kJ· mol-1 and E:63.71 kJ · mol-1-revealed that the adsorption process was endothermic and spontaneous,controlled by the chemical and physical adsorption processes.关键词
自燃煤矸石/磷酸盐/吸附机理Key words
spontaneous combustion coal gangue/phosphate/adsorption mechanism分类
资源环境引用本文复制引用
丁伟,巴图其木格,张玲玲,白淑琴..自燃煤矸石吸附磷的动力学和热力学[J].环境工程学报,2017,11(7):4059-4066,8.基金项目
内蒙古自然科学基金资助项目(2014MS0202) （2014MS0202）
