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福州大学学报(自然科学版) 2018
N-亚硝基苯胲铵在钛铁矿表面的吸附特性研究
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Abstract:
以N-亚硝基苯胲铵在钛铁矿表面的吸附特性为研究对象,考察药剂pH值、药剂浓度、矿浆温度对吸附动力学及热力学的影响. 动力学研究结果表明,N-亚硝基苯胲离子在钛铁矿表面的吸附动力学符合准一级动力学方程,矿物表面活性质点在矿物表膜中的扩散是吸附过程的控制性步骤. 吸附热力学研究结果表明,药剂吸附符合Langmuir单分子层吸附模型,吸附过程的ΔGθ随温度上升而降低,但随药剂浓度的增加而增加. 平均吸附能结果表明,在所研究的条件下药剂在钛铁矿表面的吸附属于离子交换吸附模式.
The adsorption properties of cupferron on ilmenite were taken as the object. Thermodynamic and kinetic characteristics during adsorption process were studied in detail by varying the pH value,reagent concentration and adsorption time. Kinetic studies showed that the adsorption of cupferron onto ilmenite accord well with pseudo-first order kinetic equation. The mineral activity sites diffusion in the mineral surface film was the rate-determining step in the adsorption process. The results of adsorption thermodynamics indicated that Langmuir monolayer adsorption model could explain the adsorption process well. The change of ΔGθ for adsorption decreased with the temperature increasing and increased with the reagent concentration. The mean adsorption energy research demonstrated that the adsorption mode at low temperature is of ion-exchange type