Equilibrium and kinetics of cadmium adsorption from aqueous solutions using untreated Pinus halepensis sawdust |
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| Authors: | L Semerjian |
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| Affiliation: | 1. Division of Chemistry, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan;2. School of Chemistry and Biochemistry, Thapar University, Patiala, Punjab 147004, India;3. Saha Institute of Nuclear Physics, Kolkata 700064, India;1. Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China;2. The 702 Research Institute of China Shipbuilding Industry Corporation, Wuxi 214082, China;3. Indian River Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida, Fort Pierce, FL 34951, USA |
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| Abstract: | Untreated Pinus halepensis sawdust has been investigated as an adsorbent for the removal of cadmium from aqueous solutions. Batch experiments were carried out to investigate the effect of pH, adsorbent dose, contact time, and metal concentration on sorption efficiency. The favorable pH for maximum cadmium adsorption was at 9.0. For the investigated cadmium concentrations (1–50 mg/L), maximum adsorption rates were achieved almost in the 10–20 min of contact. An adsorbent dose of 10 g/L was optimum for almost complete cadmium removal within 30 min from a 5 mg/L cadmium solution. For all contact times, an increase in cadmium concentration resulted in decrease in the percent cadmium removal (100–87%), and an increase in adsorption capacity (0.11–5.36 mg/g). The equilibrium adsorption data were best fitted with the Freundlich isotherm (R2 = 0.960). The kinetics of cadmium adsorption was very well described by the pseudo-second-order kinetic model (R2 > 0.999). |
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