Abstract
Pollution during rapid industrialization process is a serious environmental problem that seriously affects people's lives and livelihoods. Among them, the pollution of excessive heavy metals in wastewater has attracted wide attention. The current study proposes a novel effective and low-cost silica@polyacrylamide composites (SP-C) to capture cadmium ion (Cd2+) from wastewater contaminated by heavy metal. The chemical and physical properties of the surface and interior of silica@polyacrylamide composites were studied by different characterization methods. The adsorption capacity and kinetics of cadmium ions in aqueous solutions using silica@polyacrylamide composites were also studied, and some discussions about the mechanism of adsorption process were made. Silica@polyacrylamide composites showed enhanced cadmium ions adsorption with the maximum adsorption capacity of 211.86 mg/g (pH 6.5, T = 318.15 K), which was fitted by Langmuir model. The adsorption experimental kinetic data of silica@polyacrylamide composites could be excellently verified by pseudo-second-order model. Moreover, a comparison of the cost between the proposed silica@polyacrylamide composites and other reported adsorbents is provided. And the results indicate that the silica@polyacrylamide composites adsorption cost is 0.16 $/g cadmium ion, which means a promising cost-effective adsorbent for cadmium ion removing.
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Acknowledgements
The authors acknowledge the National Natural Science Foundation of China (21506179, 51608464, 21506181), Hunan province science and technology department (2017JJ3291, 2017TP2026, 2018SK2027, 2018RS3088, 2019JJ40281, 2019SK2112, 2019JJ30022), Research Start-up Foundation of Xiangtan University (15KZ08065). Research Centre of Chemical Process Simulation Engineering for National Department of Education, Hunan Key Laboratory of Chemical Process Integration Technology for Friendly Environment, National & Local United Engineering Research Centre of Chemical Process Simulation and Intensification, Optimization and Collaborative Innovation Center of New Chemical Technologies for Environmental Benignity and Efficient Resource Utilization and Xiangtan science and technology project, China Scholarship council (CSC). Hunan Provincal Engineering Research Center of Sepiolite Resource for Efficient Utilization.
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Xiayi (Eric) Hu and Xuanping Luo are co-first authors.
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Hu, X., Luo, X., Xiao, G. et al. Low-cost novel silica@polyacrylamide composites: fabrication, characterization, and adsorption behavior for cadmium ion in aqueous solution. Adsorption 26, 1051–1062 (2020). https://doi.org/10.1007/s10450-020-00225-4
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DOI: https://doi.org/10.1007/s10450-020-00225-4