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Ahmed, Mohammad Boshir; Zhou, John L.; Ngo, Huu Hao; Guo, Wenshan; Johir, Md. Abu Hasan; Belhaj, Dalel
Bioresource technology, 08/2017, Letnik: 238Journal Article
Display omitted •Competitive sorption affinities followed the order: STZ>SMX>CP>SMT.•Maximum sorption affinity was found at pH ∼4.0–4.25 for all antibiotics.•Main sorption mechanisms were H-bonds and charge assisted hydrogen bond formation.•Electron-donor-acceptor interactions also played a significant role.•Sorption decreased as deionized water>lake water>synthetic wastewater. Competitive sorption of sulfamethazine (SMT), sulfamethoxazole (SMX), sulfathiazole (STZ) and chloramphenicol (CP) toward functionalized biochar (fBC) was highly pH dependent with maximum sorption at pH ∼4.0–4.25. Equilibrium data were well represented by the Langmuir and Freundlich models in the order STZ>SMX>CP>SMT. Kinetics data were slightly better fitted by the pseudo second-order model than pseudo first-order and intra-particle-diffusion models. Maximum sorptive interactions occurred at pH 4.0–4.25 through H-bonds formations for neutral sulfonamides species and through negative charge assisted H-bond (CAHB) formation for CP, in addition to π-π electron-donor-acceptor (EDA) interactions. EDA was the main mechanism for the sorption of positive sulfonamides species and CP at pH<2.0. Sorption of negative sulfonamides species and CP at pH>7.0 was regulated by H-bond formation and proton exchange with water by forming CAHB, respectively. The results suggested fBC to be highly efficient in removing antibiotics mixture.
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