Zhao Haiyan, Wang Ziqian, Liang Yonghong, Wu Tianxiang, Chen Yiliang, Yan Jieru, Zhu Yiyong, Ding Dahu
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
Jiangsu Provincial Cultivated Land Quality and Agricultural Environmental Protection Station, China.
Environ Res. 2023 Jun 1;226:115676. doi: 10.1016/j.envres.2023.115676. Epub 2023 Mar 11.
Efficient abatement of antibiotics from livestock wastewater is in urgent demand, but still challenging. In this study, alkaline-modified biochar with larger surface area (130.520 m g) and pore volume (0.128 cm g) was fabricated and explored for the adsorption of different types of antibiotics from livestock wastewater. Batch adsorption experiments demonstrated that the adsorption process was mainly determined by chemisorption and was heterogeneous, which could be moderately affected by the variations of solution pH (3-10). Furthermore, the computational analysis based on density functional theory (DFT) indicated that the -OH groups on biochar surface could serve as the dominant active sites for antibiotics adsorption due to the strongest adsorption energies between antibiotics and -OH groups. In addition, the antibiotics removal was also evaluated in multi-pollutants system, where biochar performed synergistic adsorption towards Zn/Cu and antibiotics. Overall, these findings not only deepen our understandings on the adsorption mechanism between biochar and antibiotics, but also promote the application of biochar in the remediation of livestock wastewater.
迫切需要有效去除畜禽废水中的抗生素，但这仍然具有挑战性。在本研究中，制备了具有较大表面积（130.520 m²/g）和孔体积（0.128 cm³/g）的碱性改性生物炭，并探索了其对畜禽废水中不同类型抗生素的吸附性能。批量吸附实验表明，吸附过程主要由化学吸附决定，且是非均相的，溶液pH值（3 - 10）的变化会对其产生一定影响。此外，基于密度泛函理论（DFT）的计算分析表明，生物炭表面的 -OH基团可作为抗生素吸附的主要活性位点，因为抗生素与 -OH基团之间的吸附能最强。此外，还在多污染物体系中评估了抗生素的去除情况，生物炭对锌/铜和抗生素表现出协同吸附作用。总体而言，这些发现不仅加深了我们对生物炭与抗生素之间吸附机制的理解，也促进了生物炭在畜禽废水修复中的应用。
