Abstract
This study explored the adsorption of representative non-steroidal anti-inflammatory drugs (NSAIDs), acetaminophen (AP), ibuprofen (IB), and salicylic acid (SA) by biochars. The sorption kinetics were fitted with six commonly used kinetic models, and the isotherm data was well described by both Langmuir and Freundlich models. Biochars of longer pyrolysis time showed better performance with the Langmuir maximum sorption capacities for AP, IB, and SA of 196 mg/g, 132 mg/g, and 48.8 mg/g, respectively. Variation in temperature hardly affected the adsorption performances, while the influence of pH exhibited pronounced dependency on physicochemical properties of both NSAIDs and biochars. Eighteen ball-milled (BM) biochars were then produced under different ball-milling conditions and examined for NSAIDs removal. Compared with unmilled biochars, BM-biochars produced under optimum conditions showed higher removal efficiencies. Electrostatic interaction and pore width of biochars greatly affected the NSAIDs adsorption onto biochars.
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This work was financially supported by the National Natural Science Foundation of China (41730856, 41877182), and the Fundamental Research Funds for the Central Universities (020614380106, 020614380090).
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Luo, R., Li, X., Xu, H. et al. Effects of Temperature, Solution pH, and Ball-Milling Modification on the Adsorption of Non-steroidal Anti-inflammatory Drugs onto Biochar. Bull Environ Contam Toxicol 105, 422–427 (2020). https://doi.org/10.1007/s00128-020-02948-0
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DOI: https://doi.org/10.1007/s00128-020-02948-0