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Author: search.filters.author.Mohammad Sina MohtaramSubject: search.filters.subject.Bi2MoO6

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    Efficient charge transfer in rheum ribes waste-derived biochar-supported Bi2MoO6 nanocomposites for visible-light-driven photocatalytic degradation of antibiotics
    (Elsevier BV, 2025-11)
    Fatemeh Khezri Shooshtari
    ;
    Mohammad Sina Mohtaram
    ;
    Pegah Roohparvarzadeh
    ;
    Mohammad Mahdi Zerafat
    ;
    HESAM, KAMYAB  
    The sustainable removal of emerging pharmaceutical pollutants from aqueous systems has become a critical environmental challenge, demanding the development of efficient and reusable photocatalysts. Herein, a novel Rheum ribes waste-derived biochar supported Bi2MoO6 (Bi2MoO6/BC) nanocomposite was synthesized and systematically evaluated for visible-light-driven tetracycline (TC) degradation. Structural and morphological analyses (XRD, FTIR, SEM, TEM, and EDX mapping) confirmed the successful anchoring of ultrathin Bi2MoO6 nanosheets onto a porous conductive biochar matrix, providing abundant surface-active sites. Optical and electrochemical characterizations (UV–Vis DRS, PL, EIS, and photocurrent) demonstrated enhanced visible-light absorption, narrowed band gap, quenched photoluminescence, lower charge-transfer resistance, and higher photocurrent density, all indicative of efficient charge separation. RSM optimization using Design-Expert revealed catalyst dosage, initial concentration, and solution pH as decisive parameters, with optimal conditions (1 g L−1, 20 ppm, pH = 6) yielding degradation efficiencies above 95 %. Radical trapping experiments confirmed •O₂− as the dominant species, with •OH and h+ also contributing, and the synergistic mechanism featuring rapid electron transfer to biochar and the subsequent production of reactive radicals ultimately enabled the complete degradation of TC into CO₂ and H₂O.