Abstract
In recent years, cadmium pollution in water environment has become an environmental problem that could not be ignored. As a porous carbon rich solid material, biochar is an environment-friendly new material because of its ultra-high adsorption capacity and strong chemical stability. In this study, rice straw biochar (RS-Biochar) was successfully prepared at different temperatures for removal of Cd(II) from aqueous solution. Through a series of characterization and adsorption experiments, the adsorption principle of Cd(II) by RS-Biochar was deeply studied. The results showed that RS-Biochar prepared at 600 °C (BioC600) has high specific surface area (232.6 m2/g) and shows high Cd(II) removal rate of 91.23% with the maximum Cd(II) adsorption capacity of 8.62 mg/g. The Langmuir model fit well to describe the adsorption process of Cd(II) on the BioC600. The mechanism analysis showed that hydroxyl and carboxyl groups on the biochar surface were concerned in the removal of Cd(II). The formation of CdCO3 in the adsorption process was also be proven. Importantly, RS-Biochar could be conveniently produced with needed scale, displaying a promising approach for remediating Cd(II)-contaminated water environment and a huge application potential.
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This work was supported by the National Natural Science Foundation of China (51908233) and National Natural Science Foundation of China (41907124).
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Qiao Xiong: methodology, formal analysis, software, investigation, writing — original draft. Yinqiu Li: investigation. Chaohua Hou: investigation. Xiao Ma: software, validation. Xiangjun Zhou: software, validation. Xiangru Zuo: supervision. Chang Chen: writing — review and editing.
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Xiong, Q., Li, Y., Hou, C. et al. An efficient and simple approach to remove Cd(II) in aqueous solution by using rice straw biochar: performance and mechanisms. Environ Sci Pollut Res 31, 16782–16794 (2024). https://doi.org/10.1007/s11356-024-32222-3
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DOI: https://doi.org/10.1007/s11356-024-32222-3