Adsorption characteristics of ciprofloxacin onto g-MoS<sub>2</sub> coated biochar nanocomposites

doi:10.1007/s11783-019-1218-0

Front. Environ. Sci. Eng.

2020, Vol. 14

Issue (3) : 41 https://doi.org/10.1007/s11783-019-1218-0

RESEARCH ARTICLE

Adsorption characteristics of ciprofloxacin onto g-MoS₂ coated biochar nanocomposites

Zhenyu Yang¹, Rong Xing¹, Wenjun Zhou^1,²(

), Lizhong Zhu^1,²

¹. Department of Environmental Science, Zhejiang University, Hangzhou 310058, China
². Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China

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Abstract

• 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.

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 π electrons, which was favorable in enhancing the π-π 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, π-π 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.

Keywords Adsorption Ciprofloxacin g-MoS₂ nanosheets Biochar Soil remediation

Corresponding Author(s): Wenjun Zhou

Issue Date: 02 March 2020

Cite this article:

Zhenyu Yang,Rong Xing,Wenjun Zhou, et al. Adsorption characteristics of ciprofloxacin onto g-MoS₂ coated biochar nanocomposites[J]. Front. Environ. Sci. Eng., 2020, 14(3): 41.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-019-1218-0
https://academic.hep.com.cn/fese/EN/Y2020/V14/I3/41

Fig.1 SEM-EDS analyses of BC700 and g-MoS₂-BC700. (a) BC700; (b) g-MoS₂-BC700; (c) CIP loaded g-MoS₂-BC700.

Fig.2 The high-resolution scans of Mo 3d and S 2s (a), S 2p (b) of g-MoS₂-BC700.

Fig.3 FTIR spectra of BC700 and g-MoS₂-BC700.

Fig.4 Adsorption kinetics of CIP on BC700 and g-MoS₂-BC700.

Fig.5 Adsorption isotherms of CIP on different adsorbents.

Tab.1 Freundlich and Langmuir model parameters for CIP adsorption on different absorbents

Tab.2 Equilibrium adsorption amount (mg/g) of CIP onto different adsorbents at four CIP initial concentrations

Fig.6 Comparison of the experiment adsorption amount (q_e,exp) and the calculated adsorption amount (q_e,cal) of CIP on g-MoS₂-BC composites.

Fig.7 Effect of solution pH on the adsorption of CIP on g-MoS₂-BC700.

Fig.8 The proposed adsorption mechanisms for CIP on g-MoS₂-BC composites.

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