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.

中文翻译：

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环丙沙星在g-MoS 2包覆生物炭纳米复合材料上的吸附特性

摘要

通过在300°C（BC300）/ 700°C（BC700）下用g-MoS ₂纳米片涂覆原始生物炭来合成g-MoS ₂涂层生物炭（g-MoS ₂ -BC）复合材料。研究了g-MoS ₂ -BC复合材料对环丙沙星（CIP）的吸附性能，旨在开发其高效的土壤改良剂。生物炭涂层的g-MoS ₂纳米片的比表面积和孔结构显着增加。对于g-MOS _2种-BC复合物提供了更多的它的电子，这是在加强有利它-它电子CIP和生物炭之间的供体-受体（EDA）的相互作用。结果，g-MoS ₂-BC复合材料显示出比原始生物炭更快的吸附速率和更大的CIP吸附能力。涂层的g-MoS ₂纳米片由于比原始生物炭具有更大的CIP吸附能力，因此对g-MoS ₂ -BC复合材料的CIP吸附贡献更大。此外，观察到CIP对g-MoS ₂ -BC700的吸附的协同作用和对g-MoS ₂ -BC300的抑制作用。此外，CIP在g-MoS ₂ -BC复合材料上的吸附还表现出对溶液pH的强烈依赖性，因为它既会影响吸附剂表面电荷又会影响污染物的形态。有理由认为，CIP在g-MoS ₂上的吸附机理-BC复合材料涉及孔填充效果，it-it EDA相互作用，静电相互作用和离子交换相互作用。这些结果可用于生物炭的改性，以开发用于污染土壤的新型改性剂。