改性干菌吸附去除染化废水中共存污染物活性蓝13及五氯酚的研究

摘要

为了提高干菌吸附污染物的性能，分别用酸质子化处理的干菌(B.1)以及先去羧基后酸质子化处理的干菌(B.2)对共存污染物活性蓝13(RB13)和五氯酚(PCP)进行吸附去除。实验结果表明，pH值是影响吸附性能的主要因素，干菌在酸性条件下(pH=3)的污染物吸附能力要高于中性条件(pH=7)。中性条件下，干菌吸附污染物符合拟二级动力学模型及Langmuir吸附等温模型，B.2和B.1的最大单层饱和吸附量分别为38.02(RB13)、48.78 mg.g-1(PCP)和26.35(RB13)、33.90 mg.g-1(PCP)；酸性条件下，干菌吸附RB13符合Langmuir吸附等温模型，而吸附PCP则是线性吸附模型。改性后的干菌强化了RB13及PCP的吸附去除，同时B.2较B.1和未改性干菌有更好的污染物去除效果。%In order to enhance adsorption performance of dried bacteria biosorbents, an acid treated dried bacteria (B.1) and a dried bacteria treated with carboxyl-removal followed by protonation (B.2) were used to treat Reactive Blue 13 (RB13) and Pentachlorophenol (PCP) co-existed wastewater. The results indicate that pH is the main factor, and biosorption capacities under acidic condition (pH=3) are higher than that under neutral conditions (pH=7). Both biosorbents follow the pseudo-second order and the Langmuir isotherm models during adsorption. The maximum monolayer biosorption capacity of RB13 (PCP) is 38.02 (48.78) mg.g-1 for B.2 and 26.35 (33.90) mg.g-1 for B.1 under neutral conditions. However, the adsorption processes follow the Langmuir isotherm model for RB13, but a linear model for PCP under acidic conditions. Both biosorbents show improved biosorption of RB13 and PCP from aqueous solutions, and B.2 shows better performance than B.1.