新型煤基吸附剂吸附硝基苯的机理研究

ADSORPTION OF NITROBENZENE FROM AQUEOUS SOLUTION BY NEW TYPE COAL BASED ADSORBENTS

以神府煤为原料经过超细粉碎、化学处理、复合成型和后处理制得两种煤基超细复合吸附剂MMCA和AHCA,研究了二者对水溶液中硝基苯的吸附性能和吸附机理.结果表明,MMCA和AHCA对硝基苯的吸附过程符合二级吸附动力学模型,MMCA吸附硝基苯的过程由膜扩散控制,而AHCA吸附硝基苯过程由颗粒内扩散控制,求出了吸附速率常数和颗粒内有效扩散系数.MMCA和AHCA对硝基苯的吸附符合Langmuir吸附等温式,其单层饱和吸附量分别为109.89mg/g和229.57mg/g.

Tow kinds of new type coal based adsorbents MMCA and AHCA were prepared through superfine milled, chemical treatment, moulding and active treatment using Shenfu coal as raw materials. The adsorption capacity and mechanism of nitrobenzene onto them were studied. The results showed that the kinetic of nitrobenzene onto coal based adsorbents fitted second order kinetic model, the adsorption process of nitrobenzene onto MMCA,was controlled by film diffusion but AHCA was controlled by pore diffusion. The second adsorption rate constant, the effective diffusion coefficient were calculated. The nitrobenzene adsorption equilibrium onto MMCA and AHCA can be described in terms of Langmuir isotherm, maximum amount of nitrobenzene per unite weight of MMCA and AHCA to form a complete monolayer on the surface bond were 109.89 mg/g and 229.57 mg/g.