龟裂链霉菌对废水中Pb^(2+)的吸附作用

ADSORPTION OF LEAD FROM WASTE WATER BY Str. rimosus

为探讨发酵工业中废弃的菌丝体龟裂链霉菌对水中重金属离子的吸附特性 ,考察 p H、温度、粒径大小、共存离子等因素对吸附能力的影响 ,进行了实验室吸附实验 ,绘制出吸附等温线 ,并对化学改性前后的龟裂链霉菌进行了吸附对比 .结果表明 ,龟裂链霉菌对重金属的吸附具有一定的选择性 ,其中吸附 Pb2 + 的能力较高 ,饱和吸附量达 1 1 2 mg/g( p H=4 ) ,吸附过程是一吸热过程 ,以单分子层吸附为主 ,经 Na OH处理的龟裂链霉菌可提高其吸附能力 ,Cu2 + 对吸附有干扰 ,说明存在竞争吸附 .

This paper reported the adsorption of Pb 2+ from solution by using pharmaceutical fermetnation waste Str.rimosus when pH of solution decreased from 4 to 2, the Pb 2+ uptake increased from 115mg/g to 150mg/g. The Pb 2+ uptake by Str.rimosus was an endothermic process. The Pb 2+ uptake increased when the particle size of the biomass decreased. Pretreatment with HNO 3 and NaOH caused the Pb 2+ uptake by Str.rimosus decrease and increase respectively. Co ion (Cu 2+ ) in the solution competed for the adsorption sites of the biomass and restrained the adsorption of Pb 2+ .