无机材料学报2020，Vol.35Issue(3)：284-293,中插3-中插4,12.DOI:10.15541/jim20190371
氮化硼纳米片吸附Cd(Ⅱ)的动力学和热力学研究
Distinguished Cd(Ⅱ) Capture with Rapid and Superior Ability using Porous Hexagonal Boron Nitride: Kinetic and Thermodynamic Aspects
摘要
Abstract
In present work, a systematical and comprehensive understanding for the adsorption of Cd(Ⅱ) on porous hexagonal boron nitride (p-BN) was studied. The chemical compositions, morphology and surface functional groups of p-BN before and after adsorption were characterized by SEM, HRTEM, BET, XRD, and FT-IR. The effects of pH, adsorbent dosage, contact time and temperature on Cd(Ⅱ) adsorption were investigated. The maximum adsorption capacity for Cd(Ⅱ) achieves 184 mg·g–1 at pH 7.0 and 313 K. The kinetic data fitted well with pseudo-second-order model and intra-particle diffusion model, indicating that the adsorption is mainly controlled by chemisorption, and the rate-limiting step is the molecular diffusion. The adsorption isotherms are in accordance with Freundlich and Langmuir model respectively, suggesting Cd(Ⅱ) adsorbed on the heterogeneous surface through multilayer and monolayer adsorption. The thermodynamic parameters are calculated to confirm the spontaneous and endothermic process of Cd(Ⅱ) sorption. Spectroscopic results from XPS imply that p-BN adsorbent had substantial functional groups and bonding sites, which is propitious to uptake Cd(Ⅱ) from wastewater. These results revealed that p-BN is a promising candidate for Cd(Ⅱ) scavenging.关键词
氮化硼/吸附/Cd(Ⅱ)/重金属Key words
boron nitride/adsorption/cadmium/heavy metal ion分类
化学化工引用本文复制引用
李丽,郭筱洁,金阳,陈朝贵,Abdullah M Asiri,Hadi M Marwani,赵轻舟,盛国栋..氮化硼纳米片吸附Cd(Ⅱ)的动力学和热力学研究[J].无机材料学报,2020,35(3):284-293,中插3-中插4,12.基金项目
National Natural Science Foundation of China(21777102) （21777102）
