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Ahmed, Mohammad Boshir; Zhou, John L.; Ngo, Huu Hao; Johir, Md Abu Hasan; Sornalingam, Kireesan
Chemical engineering journal, 03/2018, Letnik: 335Journal Article
Display omitted •fBC removed ∼100% of EDC mixture from water and wastewater.•Sorption affinities decreased as E1 > E2 ≥ EE2 > 4tBP > BPA > E3.•Sorption in wastewater was reduced by 38–50% due to sodium laryl sulphonate.•π-π EDA interactions with H-bond formation were main sorption mechanism. Sorptive removal of six phenolic endocrine disrupting chemicals (EDCs) estrone (E1), 17β-estradiol (E2), estriol (E3), 17α-ethynylestradiol (EE2), bisphenol A (BPA) and 4-tert-butylphenol (4tBP) by functionalized biochar (fBC) through competitive interactions was investigated. EDC sorption was pH dependent with the maximum sorption at pH 3.0–3.5 due to hydrogen bonds and π-π interactions as the principal sorptive mechanism. Sorption isotherm of the EDCs was fitted to the Langmuir model. Sorption capacities and distribution coefficient values followed the order E1 > E2 ≥ EE2 > BPA > 4tBP > E3. The findings suggested that EDC sorption occurred mainly through pseudo-second order and external mass transfer diffusion processes, by forming H-bonds along with π-π electron-donor–acceptor (EDA) interactions at different pH. The complete removal of ∼500 μg L−1 of each EDC from different water decreased in the order: deionised water > membrane bioreactor (MBR) sewage effluent > synthetic wastewater. The presence of sodium lauryl sulphonate and acacia gum in synthetic wastewater significantly suppressed sorption affinity of EDCs by 38–50%, hence requiring more fBC to maintain removal efficacy.
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