Adsorption characteristics of ciprofloxacin onto g-MoS2 coated biochar nanocomposites
Zhenyu Yang1, Rong Xing1, Wenjun Zhou1,2(), Lizhong Zhu1,2
1. Department of Environmental Science, Zhejiang University, Hangzhou 310058, China 2. Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
• 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.
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