元素态Hg^0在半焦表面的吸附平衡和动力学研究  

Adsorption Equilibrium and Kinetics of Elemental Hg^0 on the Surface of Semi-coke

作　　者：张华伟[1] 牛庆欣 赵可[1] 孙华敏[1] 田原宇[1] 梁鹏[1] ZHANG Huawei NIU Qingxin ZHAO Ke SUN Huamin TIAN Yuanyu LIANG Peng(College of Chemical and Environmental Engineering,Shandong University of Science and Technology, Qingdao, Shandong 266590, Chin)

机构地区：[1]山东科技大学化学与环境工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2017年第1期54-62,共9页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51406107;21276146)

摘　　要：利用小型固定床微分反应器对制备的原料半焦以及改性半焦吸附材料进行元素态Hg^0吸附平衡和动力学研究,分别采用Langmuir方程、Freundlich方程和Temkin方程对Hg^0吸附平衡数据进行拟合,采用颗粒内扩散方程、Elovich方程、表观一级动力学方程以及准二级动力学方程对Hg^0吸附动力学数据进行拟合。结果表明,用Langmuir方程可较好预测原料半焦(HL-SC)对元素态Hg^0的吸附平衡,其吸附动力学用颗粒内扩散模型拟合的线性相关性最好;盐酸改性后的半焦(HC-SC)对元素态Hg^0的吸附平衡用Freundlich方程预测较好,其吸附动力学符合表观一级动力学方程;高锰酸钾/热处理组合改性后的半焦(KM-HT-SC)对元素态Hg^0的吸附平衡用Langmuir方程预测较好,其吸附动力学符合准二级动力学方程。A bench scale fixed bed reactor was employed to study the adsorption equilibrium and kinetics of elemental Hg^0 on the surface of raw and modified semi-coke adsorbents were simulated.Langmuir equation,Freundlich equation and Temkin equation were used respectively to fit the adsorption equilibrium data of Hg^0 and particle internal diffusion equation,Elovich equation,apparent first-order kinetic equation and pseudo-second order kinetic equation were used to fit the adsorption kinetics data of Hg^0.The results show that the adsorption equilibrium of Hg^0 on the surface of raw semi-coke（HL-SC）can be better predicted by Langmuir isotherm equation,and its absorption kinetics has the best linear correlation to the particle internal diffusion model fitting;the adsorption equilibrium of Hg^0 on the surface of hydrochloric acid modified semi-coke（HC-SC）can be better predicted by Freundlich isotherm equation,and its absorption kinetics conforms to the apparent first-order kinetics equation;and the adsorption equilibrium of Hg^0 on the surface of potassium permanganate and thermal treating modified semi-coke（KM-HT-SC）can be better predicted by Langmuir isotherm equation,and its absorption kinetics conforms to pseudo-second order kinetic equation.

关 键 词：改性半焦 Hg0吸附 吸附平衡 吸附动力学 

分 类 号：TQ534.9[化学工程—煤化学工程]