污染控制技术及原理
徐雪芹.丝瓜瓤固定简青霉吸附废水中Pb2+和Cu2+的机理[J].环境科学学报,2008,28(1):95-100
丝瓜瓤固定简青霉吸附废水中Pb2+和Cu2+的机理
- Biosorption of lead and copper ions by Penicillium simplicissimum immobilized on a loofa sponge immobilized biomass
- 基金项目：国家自然科学基金项目(No.50478054);新世纪优秀人才支持计划资助(No.NCET-04-0770)
- 作者
- 单位
- 徐雪芹
- 湖南大学, 环境科学与工程学院, 长沙 410082
- 摘要：采用一种新型固定载体——丝瓜瓤,固定简青霉(Penicilliumsp.),研究其在溶液中对金属离子Pb2+和Cu2+的吸附效果,并探讨其生物吸附机理,分析其动力学特性.实验结果表明,用丝瓜瓤固定简青霉能高效去除废水中Pb2+和Cu2+.研究发现,溶液pH值对吸附过程有较大影响,最佳吸附pH值在5.5附近;最佳吸附温度为25～35℃;溶液浓度在10～500mg·L-1范围内,固定化简青霉菌对重金属的吸附随金属离子浓度的增加而增加;吸附过程符合Langmuir等温吸附模型;生物吸附平衡时间约为60min.用0.1mo.lL-1HCl解吸,循环吸附-解吸5次后,固定化简青霉吸附金属离子的能力几乎不受影响.
- Abstract：Biosorption of Pb2+ and Cu2+ from aqueous media by Penicillium sp.immobilized within loofa sponge were explored as a function of initial solution pH,temperature,contact time and initial metal concentration.The research results showed that Penicillium sp.could be used as an efficient biosorbent for removal of heavy metal ions from aqueous solution and that the process was strongly affected by pH.The maximum uptake of metal ions was obtained at pH5.0 and the optimal temperature for biosorption was in the range of 25～35℃.The biosorptive capacity increased with initial concentrations in the concentration range 10～500 mg·L-1.Biosorption equilibrium was established by 60 min.Penicillium sp.biomass was regenerated by washing with a 0.1 mol·L-1 solution of HCl.After 5 adsorption-desorption cycles the regenerated system maintained most of its adsorption capacity.
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