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| Removal of cefalexin in water by titanium-lanthanum/cerium modified biochar |
| Received:April 06, 2025 Revised:May 19, 2025 |
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| KeyWord:antibiotic;adsorption;degradation;bimetallic modified biochar |
| Author Name | Affiliation | E-mail | | YANG Chuangye | School of Environmental Science & Engineering, Nanjing Tech University, Nanjing 211816, China | | | ZHANG Pengcheng | School of Environmental Science & Engineering, Nanjing Tech University, Nanjing 211816, China | | | DING Jiawen | School of Environmental Science & Engineering, Nanjing Tech University, Nanjing 211816, China | | | DING Zhuhong | School of Environmental Science & Engineering, Nanjing Tech University, Nanjing 211816, China | dzhuhong@njtech.edu.cn |
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| Abstract: |
| Titanium-lanthanum and titanium-cerium composite biochars（TiLaBC and TiCeBC） were prepared through loading - secondary pyrolysis method and applied for the removal of cefalexin（CEP）in solution. The experimental results showed that the loading of lanthanum and cerium significantly increased the adsorption of CEP by biochar, and the increase in titanium loading amount significantly enhanced the UV catalytic degradation ability of biochar for CEP. At a dosage of 1 g·L-1, the titanium-lanthanum and titanium-cerium composite modified biochars prepared with a titanium loading of 100 mg·g-（1 TiLaBC100 and TiCeBC100）showed removal rates of 80.3% and 83.1% for 200 mg·L-1 CEP, respectively. BET characterization showed that the specific surface areas of TiLaBC100 and TiCeBC100 were 261 m2·g-1 and 186 m2·g-1, respectively, with average pore sizes of 4.92 nm and 4.88 nm. XPS characterization indicated that surficial cerium of TiCeBC100 existed in species with two different valences. The degradation of CEP by the two compositemodified biochars was related to the generation of reactive oxygen species and h+ under UV irradiation. The initial concentration of CEP, dosage of composite modified biochar and initial pH affected the adsorption process more significantly than the photocatalytic degradation process, but the initial pH had a relatively small effect on the total removal efficiency. The presence of phosphorus inhibited the adsorption process of composite modified biochar, but did not reduce the removal efficiency of the photocatalytic process. The removal rate of CEP by the composite modified biochars decreased under complex water quality conditions, but overall, the composite modified biochars had anti-interference ability. The composite modified biochar had good recycling performance, almost no toxic effect on plant seedlings, and high economic and environmental compatibility. Therefore, this study provides an efficient treatment agent for CEP with dual adsorption and photolysis sites, which is economical and environmentally compatible. |
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