N,N′-二异丙氧基丙基-N″,N'''-氧二乙氧羰基硫脲在黄铜矿表面的吸附动力学和热力学特性  

Adsorption kinetics and thermodynamics of N,N′-dipropoxypropyl-N″, N′′′-oxydiethylenedicarbonyl bis(thiourea)with chalcopyrite

作　　者：刘广义[1] 张慧丽[1] 任恒[1] 王勇泉[1] 肖静晶[1] 高金亮[1] 范佳志 钟宏[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2015年第5期1588-1594,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51074183);国家高技术研究发展计划(863计划)项目(2013AA064101);全国优秀博士学位论文作者专项资金资助项目(2007B52);教育部新世纪优秀人才支持计划项目(NCEP-08-0568)~~

摘　　要：研究一种新型结构的双硫脲表面活性剂——N,N′-二异丙氧基丙基-N″,N′′′-氧二乙氧羰基硫脲（Di PODECTU）在黄铜矿表面的吸附动力学和热力学。研究结果表明：黄铜矿吸附Di PODECTU较佳的p H范围为5~10,吸附量随着温度的升高而减小。等温吸附模型符合Langmuir模型,其吸附焓变ΔH为-19.56 k J/mol,吸附自由能变ΔG为-28.70 k J/mol（298 K）,说明Di PODECTU在黄铜矿表面为单层化学吸附。吸附过程符合二级动力学方程,吸附速率常数Ks为0.144 m-2/（mol·h）,平衡吸附量Qe为5.72×10^-5 mol/m2,与实测值5.41×10^-5 mol/m2接近。Di PODECTU主要以化学作用方式吸附在黄铜矿表面。A novel surfactant, N, N′-dipropoxypropyl-N″, N′′′-oxydiethylenedicarbonyl bis（thiourea）（Di PODECTU） was introduced, and its adsorption kinetics and thermodynamics with chalcopyrite were investigated. The results indicate that the recommended p Hs for Di PODECTU adsorbing on chalcopyrite surface are 5-10 and the adsorption decreases with the increase of temperature. The isothermal adsorption model conforms to Langmuir model, and the adsorption enthalpy change and free energy change are-19.56 k J/mol and-28.70 k J/mol（298 K）, respectively, which demonstrates that Di PODECTU adsorbes on chalcopyrite surface mainly through monolayer chemisorption. The adsorption process conforms to second-order kinetics equation and the adsorption rate constant is 0.144 m-2/（mol·h）. The calculated equilibrium adsorption Qe（5.72×10^-5 mol/m2） is close to the experimental value Qe（5.41×10^-5 mol/m2）. Di PODECTU adsorbs on chalcopyrite surface mainly through chemisorption.

关 键 词：N N′-二异丙氧基丙基-N″ N′′′-氧二乙氧羰基硫脲 黄铜矿 吸附性能 热力学 动力学 

分 类 号：O642[理学—物理化学]