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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

Author:
Djellabi, Ridha, Yang, Bo, Xiao, Ke, Gong, Yan, Cao, Di, Sharif, Hafiz Muhammad Adeel, Zhao, Xu, Zhu, Caizhen, Zhang, Junmin
Source:
Journal of colloid and interface science 2019 v.553 pp. 409-417
ISSN:
0021-9797
Subject:
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
Abstract:
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.
Agid:
6473910