Highly efficient adsorption of Cr(VI) from aqueous solution by Fe3+ impregnated biochar |
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| Authors: | Hong Wang Zhuangzhuang Tian Ling Jiang Wenwen Luo Zhenggui Wei Shiyin Li |
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| Institution: | 1. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of the Environment, Nanjing Normal University, Nanjing, China;2. Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing, China;3. State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province), Nanjing, China;4. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, China;5. School of Electronics and Information Engineering, Sias International University, Xinzheng, China |
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| Abstract: | Biochar (BC) has been widely used as a low-cost adsorbent for the removal of contaminants from water and soil. However, the adsorption ability of BC towards heavy metal oxyanions (e.g., Cr(VI)) is relatively low due to the negatively charged surface of BC. In this study, pristine BC was impregnated with Fe3+ to improve its Cr(VI) adsorption capability. Fe3+-impregnated BC (Fe3+-BC) was successfully synthesized by a simple impregnation method and used for the removal of Cr(VI) from aqueous solution. Various factors affecting the adsorption, such as impregnation ratio, pH, adsorbent dosage, contact time, temperature, and the presence of humic acid, were investigated in detail. Results showed that Fe3+-BC had strong adsorption ability to Cr(VI) with a maximum adsorption capacity of 197.80 mg/g, which were not only significantly higher than that of the pristine BC, but also were superior to many previously reported adsorbents. It was favorable for Cr(VI) adsorption under the condition of acidic and high temperature. The adsorption data obeyed Sips and Langmuir isotherms and the kinetic data were well described by the pseudo-first-order kinetic model. The results herein revealed that the Fe3+-impregnated BC had a good potential as a highly efficient material for adsorption of Cr(VI) from aqueous solution. |
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| Keywords: | Adsorption biochar Cr(VI) Fe3+ impregnation isotherm |
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