摘要
以花生壳为吸附物质,研究了吸附pH值,吸附时间对3种不同产地花生壳吸附水溶液中Pb2+的影响,同时进行解吸研究。研究结果表明:在25℃,Pb2+的质量浓度为30mg/L条件下得出最佳吸附pH值为4.5,吸附平衡时间为30min。花生壳对Pb2+的吸附符合准二级动力学模型,Freundlich模型能很好的拟合等温吸附试验数据。吸附后的花生壳在600℃灼烧灰化回收,Pb2+的回收率达到93%以上。
With peanut hulls as adsorbent, the effects of pH value and adsorption time on the adsorption performances of three kinds of peanut hulls from different producing areas for Pb^2＋ in water solution were investigated with the desorption study carried out at the same time. The results showed that： the optimal pH value and equilibrium time for the adsorption were 4.5 and 30 min respectively, which was obtained at 25 ℃, when the mass concentration of Pb^2＋ was 30 mg/L. the adsorption of peanut hulls for Pb^2＋ fit the quasi-second order dynamic model, and the Freundlich model could perfectly describe the data of isothermal adsorption experiment. The peanut hulls after the adsorption was incandesced at 600 ℃ and the ash was reclaimed, the recovery rate of Pb^2＋ was above 93%.
出处
《工业用水与废水》
CAS
2009年第4期74-77,共4页
Industrial Water & Wastewater
关键词
花生壳
铅离子
吸附
解吸
回收
peanut hulls
lead ion
adsorption
desorption
recovery
