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        Nano-pyrite as a Reductant to Remove Chromium in Groundwater

        Nurul Aqilah Abdul,Suhaimi Abdul-Talib,Amnorzahira Amir 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.3

        Removal of total chromium (CrT) by nano-pyrite (nano-FeS2) was investigated under different environmental conditions. Size of nano-FeS2 was in the range of 50−100 nm and it contained Fe and S. Removal kinetic rate constant of CrT was significantly dependent on the suspension pH and concentrations of CrT, nano-FeS2 and Humic Acid (HA). The removal kinetic rate constant of CrT by nano-FeS2 was decreased as the concentration of CrT was increased (0.43−0.29 min−1), while contradict kinetic result was observed as the concentration of nano-FeS2 was increased (1.11−2.78 min−1). The removal kinetic rate constant of CrT was significantly increased as the suspension pH increased (0.86−3.0 min−1). However, the removal kinetic rate constant of CrT was significant decreased in the present of HA (1.25−0.25 min−1). The removal kinetic rate constant of CrT by nano-FeS2 was strongly controlled by the reactive surface area of nano-FeS2. Identification of the formation of FeCr2O4 on the surface of nano-FeS2 reveals that adsorption, complexation and reduction reactions may occur during the removal reaction. This study provides fundamental knowledge on the fate of Cr under different groundwater conditions. Findings from this study can be used to enhance remediation technology of removal heavy metals from groundwater.

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

        Chia Chay Tay,Chun-Yang Yin,Hong Hooi Liew,Suhaimi Abdul-Talib,Salmijah Surif,Afiza Abdullah Suhaimi,Soon Kong Yong 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.3

        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 sigmoidal (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 chemisorption due to good fitting of biosorption data to Langmuir and Dubinin-Radushkevich models with possibility of involvement 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.

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