摘要
利用草酸改性杨树叶为试验材料,对溶液中六价铬进行吸附去除。试验结果表明:当p H=2,吸附剂剂量为0.3 g,反应时间为120 min时,该材料对50 m L浓度为50 mg/L含铬废水的去除率达99.1%;伪二级动力学方程能较好地拟合该材料对Cr(VI)的吸附动力学过程,揭示其吸附主要是离子交换吸附;Langmuir方程能较好模拟该材料对Cr(VI)的等温吸附过程,表明其吸附主要是单分子层吸附,最大吸附量为40.91 mg/g。热力学研究表明,Cr(VI)在该材料表面的吸附是一个自发、吸热的物理吸附过程。
Poplar leaf modified by oxalate as a novel biosorbent was investigated to remove Cr( VI) from aquatic solution in batch experiment. The results indicated that when the p H was 2. 0,adsorbate dosage was 0. 3 g,reaction time was 120 min,the remove rate of the concentration of 50 mg / L Cr( VI) wastewater was 99. 1%. The kinetic adsorption process of Cr( VI)ions on poplar leaf modified by oxalate was fitted by pseudo-second-order kinetic model,and the adsorption was mainly ion exchange adsorption. Langmuir equation could simulate the material process of isothermal adsorption of Cr( VI). The fitting results indicated the adsorption of Cr( VI) ions was monolayer adsorption,and the maximum adsorption capacity was40. 91 mg / g. The thermodynamics analysis showed that the adsorption process of Cr( VI) ions on poplar leaf modified by oxalate was spontaneous,endothermic physical adsorption.
出处
《环境工程》
CAS
CSCD
北大核心
2015年第5期64-69,94,共7页
Environmental Engineering
基金
泰安市科技发展引导计划(2013040629)
山东省青少年教育科学规划课题(13CZR017)
关键词
草酸改性杨树叶
六价铬
吸附动力学
热力学
poplar leaf modified by oxalate
hexavalent chromium
adsorption kinetic
thermodynamics
