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

来源期刊:中南大学学报(自然科学版)2015年第5期

论文作者:刘广义 张慧丽 任恒 王勇泉 肖静晶 高金亮 范佳志 钟宏

文章页码:1588 - 1595

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

Key words:N, N′-dipropoxypropyl-N″, N′′′-oxydiethylenedicarbonyl bis(thiourea); chalcopyrite; adsorption performance; thermodynamics; kinetics

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(DiPODECTU)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DiPODECTU较佳的pH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 kJ/mol,吸附自由能变ΔG为-28.70 kJ/mol(298 K),说明DiPODECTU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。DiPODECTU主要以化学作用方式吸附在黄铜矿表面。

Abstract: A novel surfactant, N, N′-dipropoxypropyl-N″, N′′′-oxydiethylenedicarbonyl bis(thiourea) (DiPODECTU) was introduced, and its adsorption kinetics and thermodynamics with chalcopyrite were investigated. The results indicate that the recommended pHs for DiPODECTU 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 kJ/mol and -28.70 kJ/mol (298 K), respectively, which demonstrates that DiPODECTU 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). DiPODECTU adsorbs on chalcopyrite surface mainly through chemisorption.

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