Adsorptive decontamination of antibiotics from livestock wastewater by using alkaline-modified biochar

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 m2 g−1) and pore volume (0.128 cm3 g−1) was fabricated and explored for the adsorption of different types of antibiotics...

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Published in:Environmental research 2023-06, Vol.226, p.115676-115676, Article 115676
Main Authors: Zhao, Haiyan, Wang, Ziqian, Liang, Yonghong, Wu, Tianxiang, Chen, Yiliang, Yan, Jieru, Zhu, Yiyong, Ding, Dahu
Format: Article
Language:English
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Summary: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 m2 g−1) and pore volume (0.128 cm3 g−1) 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 Zn2+/Cu2+ 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. [Display omitted] •Alkaline activation process was used for optimization of biochar.•Adsorptive decontamination of antibiotics was performed in livestock wastewater.•Biochar performed synergistic adsorption towards Zn2+/Cu2+ and antibiotics.•Hydroxyl groups were the probable binding sites as evidenced by DFT calculations.
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2023.115676