AlCl_3改性柿叶对苯酚废水的生物吸附性能

Biosorption of Phenol Wastewater Using AlCl_3 Modified Persimmon Leaves

以柿叶为原料,采用硫酸-甲醛和AlCl_3进行改性制备新型吸附剂硫酸甲醛改性柿叶(SCLAl)。研究了SCL-Al对苯酚的吸附性能,探讨了吸附剂用量、吸附时间、初始浓度、pH值、温度等因素对吸附性能的影响。结果表明:pH值、吸附剂用量和吸附时间对吸附率的影响较明显;温度对吸附率的影响较小;SCL-Al吸附1g/L苯酚时,在pH≥7,1L苯酚溶液中吸附剂用量为15g/L,室温条件下吸附60min基本达平衡,吸附动力学符合准二级动力学方程;吸附行为符合Freundlish吸附等温式。

Persimmon leaves were modified by H2SO4-HCHO and AlCl3 to prepare a new adsorbent named as SCL-Al. The performance of phenol adsorption using modified persimmon leaves was studied. The effects of adsorbent dosage, adsorption time, initial concentration, pH value and temperature on the removal behavior of phenol were investigated. The results showed that pH value, adsorbent dosage and adsorption time had obvious effects on the adsorption efficiency, but temperature had little impact on the adsorption eficiency. The adsorption processes of 1 g/L phenol solution on SCL-Al could attain equilibrium within 60 min under conditions of pH≥7 and the adsorbent content for 1 L phenol is 15 g at room tempera- ture. The kinetics data of phenol was fitted with a pseudo second-order equation, and the adsorption con formed to the equation of Freundlish.