论文部分内容阅读
研究改性煤焦对苯甲酸的吸附行为,从动力学和热力学方面分析了苯甲酸在改性煤焦上的吸附作用机制。研究表明,Toth模型能较好地描述苯甲酸在改性煤焦上的吸附行为;该吸附过程遵循准二级动力学模型。改性煤焦吸附苯甲酸的自由能ΔG~0>0,焓变ΔH~0和熵变ΔS~0值分别为-4.60k J·mol~(-1)和-17.61J·mol~(-1)·K~(-1),表明该吸附是一个放热熵减、逆过程自发进行的过程,无化学键等强作用力。
The adsorption behavior of benzoic acid on modified coal char was studied. The adsorption mechanism of benzoic acid on modified coal char was analyzed from kinetics and thermodynamics. The results show that the Toth model can better describe the adsorption behavior of benzoic acid on the modified coal char; the adsorption process follows the quasi-second-order kinetic model. The free energy ΔG ~ 0> 0, enthalpy change ΔH ~ 0 and entropy change ΔS ~ 0 of adsorbed benzoic acid were -4.60k J · mol -1 and -17.61J · mol -1, respectively, 1) · K ~ (-1), indicating that the adsorption is an exothermic entropy reduction, spontaneous inverse process of the process, no strong chemical bonds and other forces.