School of Biosciences and Technology, VIT University, Vellore, Tamil Nadu, India.
School of Biosciences and Technology, VIT University, Vellore, Tamil Nadu, India.
J Hazard Mater. 2010 Dec 15;184(1-3):765-774. doi: 10.1016/j.jhazmat.2010.08.105.
Reports are available on silver binding capacity of some microorganisms. However, reports on the equilibrium studies on biosorption of silver by macrofungi are seldom known. The present study was carried out in a batch system using dead biomass of macrofungus Pleurotus platypus for the sorption of Ag(I). P. platypus exhibited the highest silver uptake of 46.7 mg g(-1) of biomass at pH 6.0 in the presence of 200 mg L(-1) Ag(I) at 20°C. Kinetic studies based on fractional power, zero order, first order, pseudo-first order, Elovich, second order and pseudo-second order rate expressions have been carried out. The results showed a very good compliance with the pseudo-first order model. The experimental data were analyzed using two parameter isotherms (Langmuir, Freundlich, Dubinin-Radushkevich, Temkin and Halsey), three parameter isotherms (Redlich-Peterson, Sips, Khan, Koble-Corrigan, Hill, Toth, Radke-Prausmitz, Jossens, Langmuir-Freundlich), four parameter isotherms (Weber-van Vliet, Fritz-Schlunder, Baudu) and five parameter isotherm (Fritz-Schlunder). Thermodynamic parameters of the biosorption (ΔG, ΔH and ΔS) were also determined. The present study confirmed that macrofungus P. platypus may be used as a cost effective efficient biosorbent for the removal of Ag(I) ions from aqueous solution.
已有关于某些微生物银结合能力的报告。然而，关于真菌对银的生物吸附平衡研究的报告却很少见。本研究采用死的大型真菌糙皮侧耳（Pleurotus platypus）生物量在间歇系统中进行，用于吸附 Ag（I）。在 20°C 时，在 pH 值为 6.0 且存在 200 mg/L Ag（I）的条件下，P. platypus 的生物量对银的摄取量最高，为 46.7 mg/g。基于分数幂、零级、一级、准一级、Elovich、二级和准二级速率表达式进行了动力学研究。结果表明，该模型与准一级模型非常吻合。使用两种参数等温线（朗缪尔、弗伦德利希、杜比宁-拉什凯维奇、坦金和哈尔西）、三种参数等温线（雷德利希-彼得森、西普斯、卡恩、科比-科里根、希尔、托特、拉德克-普劳米茨、乔森斯、朗缪尔-弗伦德利希）、四种参数等温线（韦伯-范维利特、弗里茨-施吕德、鲍杜）和五种参数等温线（弗里茨-施吕德）对实验数据进行了分析。生物吸附的热力学参数（ΔG、ΔH 和ΔS）也进行了测定。本研究证实，大型真菌糙皮侧耳（Pleurotus platypus）可以用作从水溶液中去除 Ag（I）离子的经济高效的有效生物吸附剂。
