Abstract The levels of enrofloxacin have exceeded acceptable standards in the water environment of many global regions, and the problem of pollution caused by enrofloxacin needs to be solved urgently. In this study, phosphoric acid and potassium hydroxide were used to modify corn stalk biochar. The properties and structure of the modified biochar were studied by scanning electron microscopy, infrared spectrometer, X-ray diffraction spectroscopy, and other analytical methods. Other factors influencing enrofloxacin adsorption were assessed using the equilibrium adsorption method. The surface area of the acid- and alkali-modified biochar was found to increase 10- and 14-fold, respectively. The equilibrium adsorption capacity of enrofloxacin on the acid- and alkali-modified biomass carbon increased by 27.80% and 54.08%, respectively. The quasi-second-order kinetic equation and Langmuir equation described the adsorption process of the biochars accurately. At pH = 5.0, the biochars had the highest levels of enrofloxacin adsorption. The adsorption of enrofloxacin onto the biochars negatively correlated with the concentration of Ca2+ in the background solution.

中文翻译：

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酸/碱改性玉米秸秆生物炭对恩诺沙星的吸附

摘要 全球多个地区的水环境中恩诺沙星的含量已超过可接受标准，恩诺沙星造成的污染问题亟待解决。本研究使用磷酸和氢氧化钾对玉米秸秆生物炭进行改性。通过扫描电子显微镜、红外光谱仪、X射线衍射光谱仪等分析方法研究了改性生物炭的性质和结构。使用平衡吸附法评估影响恩诺沙星吸附的其他因素。发现酸和碱改性的生物炭的表面积分别增加了 10 倍和 14 倍。恩诺沙星对酸、碱改性生物质炭的平衡吸附能力分别提高了27.80%和54.08%。准二级动力学方程和朗缪尔方程准确地描述了生物炭的吸附过程。在 pH = 5.0 时，生物炭的恩诺沙星吸附水平最高。恩诺沙星在生物炭上的吸附与背景溶液中 Ca2+ 的浓度呈负相关。