以二苯胺-4-磺酸钠(DPASA)为吸附质,研究了其在膨胀石墨(EG)上的吸附动力学及热力学行为;针对DPASA的初始质量浓度,温度,pH值,离子强度以及EG的膨胀容积(EV)对吸附性能的影响进行了讨论.吸附动力学研究表明此过程可用准二级模型描述;在测试DPASA质量浓度及温度下,吸附过程活化能为1～10 kJ/mol.吸附热力学研究显示DPASA在EG上的吸附属于Ⅱ型;平衡吸附量随DPASA初始质量浓度、溶液离子强度和EG的EV的增加而增大;温度和pH值对吸附性能没有显著影响;物理吸附是吸附过程中的主导因素.
With diphenylamine -4- sulfonic acid sodium (DPASA) as referenced compound, its adsorption kinetics and thermodynamics characteristics on expanded graphite (EG) were investigated. The influence of initial mass concentrations of DPASA, temperatures, pH, ionic strengths and adsorbent expanded volumes (EV) on the adsorption capacity was studied. Kinetic studies show that the kinetic data are well described by the pseudo second-order kinetic model. Under the tested condition, the activation energy of adsorption process is among 1-10 kJ/mol. The adsorption thermodynamics results indicate that the adsorption types of DPASA on EG is type II. Equilibrium adsorption amount was found to increase with the increase in initial mass concentrations of DPASA, ionic strengths and EV of the adsorbent, while temperature and solution acidity do not have an obvious effect. Physical adsorption is the major factor of the overall adsorption process.
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