School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
Chemosphere. 2023 Dec;345:140484. doi: 10.1016/j.chemosphere.2023.140484. Epub 2023 Oct 18.
The preparation, characterization and adsorption performance of the phosphate-modified hydrochar (P-hydrochar) for Pb(II) and ciprofloxacin removal are investigated. Pb(II) and ciprofloxacin adsorption behavior fit well with the Hill model with the adsorption capacity of 119.61 and 98.38 mg/g, respectively. Pb(II) and ciprofloxacin adsorption kinetic process are accurately described by the Pseudo-second-order. Pb(II) and ciprofloxacin have synergy in the binary contaminant system, which reveals that Pb(II) adsorption amount is augmented. While ciprofloxacin adsorption amount is also augmented at low Pb(II) concentration and hindered at high Pb(II) concentration. Pb(II) adsorption mechanisms on P-hydrochar (e.g. precipitation, π-π interaction and complexation) are different from the ciprofloxacin (e.g. hydrogen bonding, pore filling, electrostatic attraction). Pb(II) and ciprofloxacin adsorption process are further analyzed by the density functional theory. The coexisted ions have little influenced on Pb(II) and ciprofloxacin adsorption. P-hydrochar still has large Pb(II) and ciprofloxacin adsorption capacity after five cycles. This result indicates that poplar sawdust waste can be converted into an efficient adsorbent to remove Pb(II) and ciprofloxacin from wastewater,.
研究了磷酸盐改性水炭（P-水炭）对 Pb(II) 和环丙沙星去除的制备、表征和吸附性能。Pb(II)和环丙沙星的吸附行为均符合 Hill 模型，吸附容量分别为 119.61 和 98.38 mg/g。Pb(II)和环丙沙星的吸附动力学过程准确地描述了伪二阶动力学模型。Pb(II)和环丙沙星在二元污染物体系中具有协同作用，表明 Pb(II)的吸附量增加。而当 Pb(II)浓度较低时，环丙沙星的吸附量增加，当 Pb(II)浓度较高时，环丙沙星的吸附量受到抑制。Pb(II)在 P-水炭上的吸附机制（如沉淀、π-π 相互作用和络合）与环丙沙星的吸附机制（如氢键、孔填充、静电吸引）不同。通过密度泛函理论进一步分析了 Pb(II)和环丙沙星的吸附过程。共存离子对 Pb(II)和环丙沙星的吸附影响较小。P-水炭在经过五次循环后仍具有较大的 Pb(II)和环丙沙星吸附容量。这一结果表明，杨木锯末废物可以转化为一种有效的吸附剂，用于从废水中去除 Pb(II)和环丙沙星。
