立方体纳米Cu2O吸附热力学及动力学的粒度效应研究  

Study on Particle Size Effect on Adsorption Thermodynamics and Kinetics of Cubic Nano-Cu2O

作　　者：肖碧源 邱江源 覃方红 万婷 徐亚群 农晓慧 黄在银 XIAO Biyuan;QIU Jiangyuan;QIN Fanghong;WAN Ting;XU Yaqun;NONG Xiaohui;HUANG Zaiyin(College of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530008,China;Guangxi Colleges and Universities Key Laboratory of Food Safety and Pharmaceutical Analytical Chemistry,Nanning 530008,China)

机构地区：[1]广西民族大学化学化工学院,南宁530008 [2]广西高校食品安全与药物分析化学重点实验室,南宁530008

出　　处：《高等学校化学学报》2019年第10期2214-2224,共11页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21273050,21573048,21873022);广西民族大学研究生科研创新项目(批准号:gxun-chxzs2016120)资助~~

摘　　要：采用不同粒径的单一(100)晶面的立方体纳米Cu2O作为模型材料,研究了粒径和温度对其吸附动力学和吸附热力学性质的影响规律.基于已建立的纳米材料吸附热力学和动力学理论,推导出了单一(100)晶面立方体纳米Cu2O材料的吸附热力学和吸附动力学性质与粒径之间的关系式.实验结果与理论预测结果一致:随着纳米Cu2O粒径的减小,吸附速率常数增大而吸附活化能和吸附指前因子减小;标准摩尔吸附Gibbs自由能△Gm^■减小而标准吸附平衡常数△Gm^■、标准摩尔吸附焓△Gm^■和标准摩尔吸附熵△Gm^■均增大,且以上参数均与粒度的倒数具有较好的线性关系.The impacts of particle size and temperature on the adsorption kinetics and thermodynamics of nanomaterials were investigated by using single faceted cubic Cu2O(100)with different particle sizes as model materials.Based on previously reported theory of adsorption thermodynamics and kinetics of nanomaterials,the relationships between the particle size of the cubic Cu2O nanoparticles and their adsorption thermodynamics and kinetics were derived.The experimental results are in good agreement with the theoretical predictions.With the decrease of the size of the cubic Cu2O(100)nanoparticles,the following characteristics were observed:(1)the adsorption rate constant increased,while the adsorption activation energy and the adsorption pre-exponential factors decreased;(2)the standard molar Gibbs free energy of adsorption △Gm^■decreased,while the standard equilibrium constant △Gm^■,the standard molar enthalpy of adsorption△Gm^■,and the standard molar entropy of adsorption △Gm^■increased.The thermodynamic properties and kinetic parameters above have a good linear relationship with the reciprocal of particle size.

关 键 词：单一晶面 立方体氧化亚铜 吸附动力学 吸附热力学 粒度效应 

分 类 号：O642[理学—物理化学]