Abstract
Two kinds of pinewood sawdust activated carbon adsorbents were prepared by fast activation with H3PO4 in a spouted bed, and the application in adsorption of copper ions was investigated. With only 3 min of activation time, the BET surface area of activated carbons reached 1537.5 m2/g for impregnation mass ratio of H3PO4 to sawdust at 1:1 and activation temperature of 500 °C (IR1-500), whereas it was 1750.7 m2/g for the impregnation ratio at 4:1 and activation temperature of 800 °C (IR4-800). The pseudo second-order reaction kinetics well describes the experimental adsorption of copper ion in this study, indicating chemisorption dominated in the process. By the C1s spectrum, activated carbons from IR1-500 contained more carboxyl groups (-COOH) and carbonyl groups (C=O), which played an important role in copper ions adsorption. In addition, it was found that the P-containing groups (metaphosphates) also involved in the adsorption of copper ion.
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Acknowledgements
The research is supported by International Joint Research and Development Project of Tianjin Talent Introduction and Science & Technology Cooperation Plan (14RCGFGX00850). The authors would also like to thank the Beijing Zhongkebaice Technical Service Co., Ltd. for providing the facilities for the experimental measurements.
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Gao, X., Wu, L., Xu, Q. et al. Adsorption kinetics and mechanisms of copper ions on activated carbons derived from pinewood sawdust by fast H3PO4 activation. Environ Sci Pollut Res 25, 7907–7915 (2018). https://doi.org/10.1007/s11356-017-1079-7
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DOI: https://doi.org/10.1007/s11356-017-1079-7