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Adsorption characteristics of ciprofloxacin onto g-MoS2 coated biochar nanocomposites

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Abstract

The g-MoS2 coated biochar (g-MoS2-BC) composites were synthesized by coating original biochar with g-MoS2 nanosheets at 300°C(BC300)/700°C (BC700). The adsorption properties of the g-MoS2-BC composites for ciprofloxacin (CIP) were investigated with an aim to exploit its high efficiency toward soil amendment. The specific surface area and the pore structures of biochar coated g-MoS2 nanosheets were significantly increased. The g-MoS2-BC composites provided more it electrons, which was favorable in enhancing the it-it electron donor-acceptor (EDA) interactions between CIP and biochar. As a result, the g-MoS2-BC composites showed faster adsorption rate and greater adsorption capacity for CIP than the original biochar. The coated g-MoS2 nanosheets contributed more to CIP adsorption on the g-MoS2-BC composites due to their greater CIP adsorption capacity than the original biochar. Moreover, the synergistic effect was observed for CIP adsorption on g-MoS2-BC700, and suppression effect on g-MoS2-BC300. In addition, the adsorption of CIP onto g-MoS2-BC composites also exhibited strong dependence on the solution pH, since it can affect both the adsorbent surface charge and the speciation of contaminants. It was reasonably suggested that the mechanisms of CIP adsorption on g-MoS2-BC composites involved pore-filling effects, it-it EDA interaction, electrostatic interaction, and ion exchange interaction. These results are useful for the modification of biochar in exploiting the novel amendment for contaminated soils.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2018YFC1800704) and the National Natural Science Foundation of China (No. 21577124).

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Authors and Affiliations

  1. Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China

    Zhenyu Yang, Rong Xing, Wenjun Zhou & Lizhong Zhu

  2. Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, 310058, China

    Wenjun Zhou & Lizhong Zhu

Authors
  1. Zhenyu Yang
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  2. Rong Xing
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  3. Wenjun Zhou
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  4. Lizhong Zhu
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Corresponding author

Correspondence to Wenjun Zhou.

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Highlights

• The g-MoS2 coated composites (g-MoS2-BC) were synthesized.

• The coated g-MoS2 greatly increased the adsorption ability of biochar.

• The synergistic effect was observed for CIP adsorption on g-MoS2-RC700.

• The adsorption mechanisms of CIP on g-MoS2-BC were proposed.

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Yang, Z., Xing, R., Zhou, W. et al. Adsorption characteristics of ciprofloxacin onto g-MoS2 coated biochar nanocomposites. Front. Environ. Sci. Eng. 14, 41 (2020). https://doi.org/10.1007/s11783-019-1218-0

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  • DOI: https://doi.org/10.1007/s11783-019-1218-0

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