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Cellulose-based adsorbents loaded with zero-valent iron for removal of metal ions from contaminated water

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Abstract

Sawdust loaded with zero-valent iron (S-ZVI) was prepared using a liquid phase reduction method for removing heavy metal ions from contaminated water. Surface chemistry and morphology of adsorbents were characterized with Fourier transform infrared (FT-IR) spectrometry, X-ray diffraction (XRD), scanning electron microscopy (SEM), SEM-mapping, EDX, and X-ray photoelectron spectrum (XPS). The results demonstrated that the zero-valent iron was successfully loaded onto the sawdust. The impact of various factors such as pH, initial metal ion concentration, temperature, and contact time on the removal capability of the adsorbents was systematically investigated. The equilibrium adsorption data showed that the adsorption of arsenic ions and Cr(III) followed the Langmuir model well, and the maximum adsorption reached 111.37 and 268.7 mg/g in an aqueous solution system. In addition, the adsorption kinetics was more accurately described by the pseudo-second-order model, suggesting the domination of chemical adsorption. Meanwhile, the results on recyclability indicated that the high performance of S-ZVI on the removal of arsenic ions was well maintained after three regeneration cycles. The adsorption mechanism revealed in this work suggested that S-ZVI improved the dispersion of ZVI by minimizing the agglomeration, thus leading to highly effective adsorption via chelation, electrostatic interaction, and redox reaction.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 21466005 and 21507029), the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (No. 2018 k001), and NSERC Canada.

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Correspondence to Yuanfeng Pan or Huining Xiao.

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Li, X., Zhang, J., Xie, H. et al. Cellulose-based adsorbents loaded with zero-valent iron for removal of metal ions from contaminated water. Environ Sci Pollut Res 27, 33234–33247 (2020). https://doi.org/10.1007/s11356-020-09390-z

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  • DOI: https://doi.org/10.1007/s11356-020-09390-z

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