Abstract
Herein, biochar derived from lotus seedpods, as an effective adsorbent, was prepared by pyrolysis method at 300 and 600 °C. The physicochemical characteristics and cadmium adsorption properties were studied systematically by batch adsorption experiments, FTIR, SEM–EDX, XRD, and XPS. Cd adsorption onto lotus seedpod-derived biochar was better fitted using Freundlich isotherm and pseudo-second-order model. Adsorption capacity of biochar produced at 300 and 600 °C was 31.69 and 51.18 mg g−1, respectively. The Cd adsorption capacity of biochar was related to its characteristics determined by pyrolysis temperature, including carbonization, surface area, surface morphology, and surface functional groups. Cd adsorption on lotus seedpod-derived biochar revealed that adsorption was controlled by multiple mechanisms including surface complexation, ion exchange, surface precipitation, and Cd–π interaction. This study showed that lotus seedpod-derived biochar is an effective and environmentally friendly adsorbent for water treatment.
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Funding
This work was supported by the National Natural Science Foundation of China [51408214, 31671635, 41501343, 31400374], the Scientific Research Foundation of Hunan Provincial Education Department [14B066], Key R & D Foundation of Hunan [2017SK2385], the Open Foundation of Chemo/Biosensing and Chemometrics State Key Laboratory [2014018], and Hunan University of Science and Technology Student Research and Innovation Program [SZZ2017002].
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Chen, Z., Liu, T., Tang, J. et al. Characteristics and mechanisms of cadmium adsorption from aqueous solution using lotus seedpod-derived biochar at two pyrolytic temperatures. Environ Sci Pollut Res 25, 11854–11866 (2018). https://doi.org/10.1007/s11356-018-1460-1
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DOI: https://doi.org/10.1007/s11356-018-1460-1