Li Xiao-Ming, Liao De-Xiang, Xu Xue-Qin, Yang Qi, Zeng Guang-Ming, Zheng Wei, Guo Liang
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
J Hazard Mater. 2008 Nov 30;159(2-3):610-5. doi: 10.1016/j.jhazmat.2008.02.068. Epub 2008 Mar 4.
Biosorption potential of Penicillium simplicissimum (Penicillium sp.) immobilized within loofa sponge (PSILS) for lead and copper from aqueous media was explored. The effects of pH, contact time and initial concentration were studied in batch experiments. The maximum uptake of metal ions was obtained at pH 5.0. Biosorption equilibrium was established by 60 min. The pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models were applied to study the kinetics of the biosorption processes. The pseudo-second-order kinetic model provided the best correlation (R(2)>0.999) of the experimental data compared to the pseudo-first-order and intraparticle diffusion kinetic models. The maximum heavy metal ions adsorbed was found to be 152.6 and 112.3mg/g for Pb(II) and Cu(II), respectively. It was found that the biosorption of both Pb(II) and Cu(II) on PSILS was correlated well (R(Pb)(2)=0.999 and R(Cu)(2)=0.9978) with the Langmuir equation as compared to Freundlich isotherm equation under the concentration range studied. PSILS was regenerated by washing with a 100mM solution of HCl. The desorption efficiency was as high as 98%. The PSILS was reused in five adsorption-desorption cycles with negligible decrease in biosorption capacity. The present work showed that PSILS was an efficient biosorbent for removal of heavy metal ions from aqueous solution.
研究了固定在丝瓜海绵（PSILS）中的简单青霉（Penicillium sp.）对水相中铅和铜的生物吸附潜力。在分批实验中研究了pH值、接触时间和初始浓度的影响。在pH 5.0时获得了金属离子的最大吸收量。60分钟时建立了生物吸附平衡。应用伪一级、伪二级和颗粒内扩散动力学模型来研究生物吸附过程的动力学。与伪一级和颗粒内扩散动力学模型相比，伪二级动力学模型对实验数据的相关性最好（R(2)>0.999）。发现PSILS对Pb(II)和Cu(II)的最大重金属离子吸附量分别为152.6和112.3mg/g。发现在所研究的浓度范围内，与Freundlich等温方程相比，PSILS对Pb(II)和Cu(II)的生物吸附与Langmuir方程的相关性良好（R(Pb)(2)=0.999和R(Cu)(2)=0.9978）。用100mM HCl溶液洗涤使PSILS再生。解吸效率高达98%。PSILS在五个吸附-解吸循环中重复使用，生物吸附容量的下降可忽略不计。目前的工作表明，PSILS是一种从水溶液中去除重金属离子的有效生物吸附剂。
