Enhancing oxytetracycline degradation and reducing its transfer to lettuce using biochar combined with carbohydrate carbon sources

作者：Jiefeng Zeng, Xiao Wang, Xin He, Zhanyi Gao, Feiyang Zeng, Qiang Zheng, Peiling Yang · 发表于：Biochar · 年份：2025 · DOI：10.1007/s42773-025-00502-x · 被引用次数：3 · 研究领域：Adsorption and biosorption for pollutant removal、Water Quality Monitoring and Analysis、Natural Products and Applications

Abstract Biochar has been widely recognized for its ability to adsorb soil antibiotics (like oxytetracycline, OTC) and inhibit their translocation to plants, but there remain limitations in further reducing OTC toxicity. In this study, lettuce was used as the test crop, with treatments including biochar alone (BC), biochar combined with carbohydrate carbon sources (CCS), and a control treatment without biochar (CK). Specifically, the treatments that combined biochar and CCS included biochar-glucose (BCG), biochar-sucrose (BCSU), and biochar-starch (BCST). The objectives were to improve the soil degradation efficiency of OTC, lower its toxicity, reduce its transfer to lettuce roots and leaves, and promote lettuce growth. In addition, the study explored the mechanisms of soil improvement and OTC degradation when biochar was combined with CCS. The results showed that BC increased the soil OTC degradation efficiency by 22–67% and reduced the translocation of OTC to lettuce leaves by approximately 0.51–1.23 mg kg −1 , while slightly increasing microbial activity. By activating redox enzyme activity without reducing soil mineralization, the BCG, BCSU, and BCST treatments significantly enhanced OTC degradation efficiency to 87%, 86%, and 92%, respectively. However, because low-molecular-weight sugars metabolize quickly, the BCG and BCSU treatments did not maintain a prolonged enhancement of soil enzyme activity and OTC degradation efficiency. In contrast, the BCST treatment exhibite...