Biosorption of cadmium ions using Pleurotus ostreatus: Growth kinetics, isotherm study and biosorption mechanism

• DOI: 10.1007/s11814-010-0435-9
• Publication Date: 2011-02-17T16:23:14Z
• Authors: Chia Chay Tay; Hong Hooi Liew; Chun-Yang Yin; Suhaimi Abdul-Talib; Salmijah Surif; Afiza Abdullah Su...; Soon Kong Yong
• Keywords: 0211 other engineering and technologies; 02 engineering and technology

The mycelial growth kinetics, cadmium biosorption capacity and main governing biosorption mechanism of Pleurotus ostreatus (oyster mushroom) have been determined in this study. The fungus mycelium exhibits a sig- moidal (S-shaped) growth curve in which the growth rates for the lag and exponential phases are 0.1 and 0.31 g/L·day, respectively. The grown fungus is subjected to elemental, infra-red and scanning electron microscopy-energy dispersive x-ray spectroscopy analyses, while biosorption data are fitted to established adsorption isotherm models, namely, Langmuir, Freundlich and Dubinin-Radushkevich. It is strongly suggested that the main governing mechanism involved is chemi- sorption due to good fitting of biosorption data to Langmuir and Dubinin-Radushkevich models with possibility of in- volvement of both ion exchange and complexation. Data presented in the study are very useful for design of future pilot- or industrial-scale biosorption water purification systems.