Competitive or synergetic? Adsorption mechanism of phosphate and oxytetracycline on chestnut shell-derived biochar

文献类型： 外文期刊

第一作者： Guo, Xuan

作者： Guo, Xuan;Zhu, Lin;Ma, Maoting;Zou, Guoyuan;Wei, Dan;Guo, Xuan;Zhu, Lin;Wei, Dan;Xu, Xin

作者机构：

关键词： Biochar; Competitive adsorption; Synergetic adsorption; Antibiotics; Phosphate; Livestock and poultry wastewater

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：11.072； 五年影响因子：11.016 ）

ISSN： 0959-6526

年卷期： 2022 年 370 卷

页码：

收录情况： SCI

摘要： In the present study, the potential competitive or synergetic adsorption mechanism of phosphate and antibiotics from a solution using chestnut shell (CS)-derived biochar was explored. CSs were utilized as the raw material to prepare biochar (BCCS) and modified biochar (MBCCS) via an oxygen-isolated pyrolysis, and subsequent modi-fication using KMnO4 and FeCl3. Following the carbonization, the biochar was deoxidized, which enhanced its porous structure and specific surface area. The MBCCS, which contained Fe and Mn ions on its surfaces, showed theoretical adsorption capacities of 0.7880 mg/g P and 6.2854 mg/g oxytetracycline (OTC), respectively. The adsorption of both PO(4)(3- )and OTC by the MBCCS fitted better to the pseudo-second-order kinetic model. The PO(4)(3-)adsorption on the MBCCS fitted better to the Langmuir isotherm, whereas that of the OTC was adequately described via the Freundlich isotherm. The adsorption processes were both endothermic. The pH and cation strength of the solution significantly affected the adsorption of both PO43- and OTC. Low concentrations of OTC favored competitive adsorption with PO43 , while high concentrations of both components produced synergetic adsorption on the MBCCS. In the present study, a potential method with good reusability for the utilization of agricultural and forestry wastes is highlighted. The results also provide a scientific basis for elucidating the adsorption mechanisms of coexisting pollutants in water on biochar.

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