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Unravelling the mechanistic role of Ti[sbnd]O[sbnd]C bonding bridge at titania/lignocellulosic biomass interface for Cr(VI) photoreduction under visible light

Djellabi, Ridha, Yang, Bo, Xiao, Ke, Gong, Yan, Cao, Di, Sharif, Hafiz Muhammad Adeel, Zhao, Xu, Zhu, Caizhen, Zhang, Junmin
Journal of colloid and interface science 2019 v.553 pp. 409-417
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, biomass, chromium, contact angle, electric current, energy-dispersive X-ray analysis, light, lignocellulose, olives, photocatalysis, photocatalysts, scanning electron microscopy, titanium dioxide, ultraviolet radiation
Efficient multifunctional Titania/Lignocellulosic Biomass (TiO₂-OP) composite photocatalysts were fabricated via ultrasonic-assisted sol-gel for the photoreduction of Cr(VI) under UV and visible light. Materials were fully characterized using FTIR, XPS, BET, SEM-EDS, UV-DRS, XRD, photo-current and contact angle measurements. It was deduced that the produced TiOC bonding bridge between TiO₂ clusters and olive pits lignocellulosic surface exhibits a significant role for the visible light response and band gap narrowing, wherein, Eg values were between 3.02 and 2.63 eV as a function of TiO₂/OP ratio. TiO₂-OP composites showed an astonishing photocatalytic efficiency, i.e., a complete reduction of Cr(VI) at 10 ppm was found within 30 min with TiO₂-OP(50%), against 90 min for TiO₂ under UV light. Nevertheless, in terms of TiO₂-OP(50%), a total reduction was obtained within 50 min under visible light, while no photoactivity was observed with bare-TiO₂. Several plausible mechanistic pathways behind the photocatalytic efficiency of TiO₂-OP composites were discussed.