Hexavalent chromium removal from aqueous solution by adsorption on treated sawdust |
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| Institution: | 1. Department of Environment Management & Inorganic Chemicals, Regional Research Laboratory, Bhubaneswar 751013, Orissa, India;2. Department of Chemical Engineering, National Institute of Technology, Rourkela 769008, Orissa, India;1. Kurdistan Environmental Health Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran;2. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea;1. Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland;2. Department of Natural Resources, Isfahan University of Technology, Isfahan 8415683111, Iran;3. Department of Fisheries, Faculty of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University, Km 9 Darya Boulevard, P.O. Box, 578, Sari, Iran;4. Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggi-do 10326, Republic of Korea;5. Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Saharanpur Campus, Saharanpur 247001, India;6. Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda 10250, Sri Lanka;1. Department of Chemistry, Siksha ‘O’ Anusandhan Deemed to be University Bhubaneswar, India;2. Department of Mechanical Engineering, Siksha ‘O’ Anusandhan, Deemed to be University Bhubaneswar, India;3. Department of Physics, Siksha ‘O’ Anusandhan, Deemed to be University Bhubaneswar, India;1. Center for Bioenergy, School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India;2. Department of Chemical Engineering, School of Chemical & Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India;1. Students Research Committee, Faculty of Health, Ardabil University of Medical Sciences, Ardabil, Iran;2. Department of Environmental Health Engineering, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran;3. Social Determinants of Health Research Center, Ardabil University of Medical Sciences, Ardabil, Iran;4. Department of Environmental Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran |
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| Abstract: | The studies on adsorption of hexavalent chromium were conducted by varying various parameters such as contact time, pH, amount of adsorbent, concentration of adsorbate and temperature. The kinetics of adsorption of Cr(VI) ion followed pseudo second order. Langmuir adsorption isotherm was employed in order to evaluate the optimum adsorption capacity of the adsorbent. The adsorption capacity was found to be pH dependant. Sawdust was found to be very effective and reached equilibrium in 3 h (adsorbate concentration 30 mg l−1). The rate constant has been calculated at 303, 308, 313 and 318 K and the activation energy (Ea) was calculated using the Arrhenius equation. Thermodynamic parameters such as standard Gibbs energy (ΔG°) and heat of adsorption (ΔHr) were calculated. The ΔG° and ΔHr values for Cr(VI) adsorption on the sawdust showed the process to be exothermic in nature. The percentage of adsorption increased with decrease in pH and showed maximum removal of Cr(VI) in the pH range 4.5–6.5 for an initial concentration of 5 mg l−1. |
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