Photocatalytic removal of chromium(VI) and sulfite using transition metal (Cu, Fe, Zn) doped TiO2 driven by visible light: Feasibility, mechanism and kinetics

Zhang, Jinghong; Fu, Dong; Wang, Shuqin; Hao, Runlong; Xie, Yixiao

doi:10.1016/j.jiec.2019.07.027

Cited by 53 publications

(12 citation statements)

References 66 publications

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“…The high-resolution FESEM image indicated that these agglomerates were composed of nano-scaled particles (Figure 1c). The irregular topography [25] and large surface area resulted from pores [32] were helpful for the WT powders to absorb and scatter the incident light. The EDX spectrum of the WT powders confirmed the presence of C, O, N, S, and Ti elements.…”

Section: Examination Of Particle Morphologiesmentioning

confidence: 99%

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Zhang

et al. 2020

Catalysts

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In this study, a special core–shell structured wool-TiO2 (WT) hybrid composite powder also having TiO2 nanoparticles incorporated inside cortical cells was reported. The wool pallets were pulverized from wool fibers using vibration-assisted ball milling technique and the WT powders having mesopores and macropores were produced in hydrothermal process. Experimental results indicated that the infiltrated TiO2 nanoparticles were amorphous structure, while the coated TiO2 nanoparticles were anatase phase structure. The crystallized TiO2 nanoparticles were grafted with wool pallets by the N−Ti4+/S−Ti4+/O−Ti4+ bonds. The BET surface area was measured as 153.5 m2/g and the particle sizes were in the 600–3600 nm and 4000–6500 nm ranges. The main reactive radical species of the WT powders were holes, and •O2−, 1O2, and •OH were also involved in the photodegradation of MB dye under visible light irradiation. The experimental parameters for photodegradation of MB dye solution were optimized as follows: 0.25 g/L of WT powders was added in 40 mL of 3 mg/L MB dye solution containing 50 mL/L H2O2, which resulted in the increases of COD value of degraded MB dye solution up to 916.9 mg/L at 120 min. The WT powders could be used for repeatedly photodegradation of both anionic and cationic dyes.

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Section: Examination Of Particle Morphologiesmentioning

confidence: 99%

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Zhang

et al. 2020

Catalysts

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“…Metals with partially filled d-orbitals such as transition metals can cause acceleration in electron-hole generation because of their similarity in electronic configuration to TiO 2 [15,16]. They are capable of creating a localized electronic state in the valence band and conduction band of TiO 2 [17,18]. However, the electronegativity and variable oxidation states in transition metals can hinder their application as a dopant in the optimization of the photo-catalytic property of TiO 2 [19].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Oxygen Deficient TiO2 for Improved Photocatalytic Efficiency in Solar Radiation

et al. 2021

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The photocatalytic activities of TiO2 have been limited mainly to absorbing in the ultraviolet spectrum which accounts for only 5% of solar radiation. High energy band gap and electron recombination in TiO2 nanoparticles are responsible for its limitations as a photocatalyst. An oxygen deficient surface can be artificially created on the titanium oxide by zero valent nano iron through the donation of its excess electrons. A visible light active TiO2 nanoparticle was synthesized in the current investigation through simple chemical reduction using sodium boro-hydride. The physical and textural properties of the synthesized oxygen deficient TiO2 photocatalyst was measured using scanning/ transmission electron microscopy while FTIR, XRD and nitrogen sorption methods (BET) were employed for its further characterizations. Photochemical decoloration of orange II sodium dye solution in the presence of the synthesized TiO2 was measured using an UV spectrophotometer. The resulting oxygen deficient TiO2 has a lower energy band-gap, smaller pore sizes, and enhanced photo-catalytic properties. The decoloration (88%) of orange (II) sodium salt solution (pH 2) under simulated solar light was possible at 20 min. This study highlights the effect of surface oxygen defects, crystal size and energy band-gap on the photo-catalytical property of TiO2 nanoparticles as impacted by nano zero valent iron. It opens a new window in the exploitation of instability in the dopant ions for creation of a visible light active TiO2 photocatalyst.

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“…Similar trends were reported for photocatalytic removal of Cr(VI) using TiO 2 doped with different transition metals. Removal efficiencies of Cr(VI) using Cu-TiO 2 and Fe-TiO 2 catalysts were 72.8% and 62.1%, respectively [28].…”

Section: Adsorption Of Zn and Pbmentioning

confidence: 97%

Vanadium doped titania nanoparticles for photocatalytic removal of heavy metals from aqueous solutions

Mirghani

2021

Journal of Experimental Nanoscience

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Sol-gel process with continuous ultrasonication was used to produce pure and vanadium doped titania powders. The amount of vanadium doped in titania was varied by using different initial concentrations of vanadium solutions. Scanning electron microscopy and particle size analyses showed formation of spherical shaped particles with diameter ranging from 3 to 11 nm. The average pore volume was 0.0248 cm 3 /g, and the surface areas of pure and V-doped titania were 62.9 and 66.1 m 2 /g, respectively. The maximum amount of vanadium doped on titania catalyst, as determined using energy dispersive X-ray spectroscopy was 1.7 wt%, and the X-ray diffraction patterns showed the presence of mainly anatase form of titania. The photocatalytic activities of pure and V-doped titania were tested for methylene blue, and the metal uptake was found to increase from 10 mg/g for pure titania to 17 mg/g for V-doped titania. Adsorption isotherms for removal of lead and zinc from aqueous solutions were generated under ultraviolet exposure for 24 h, and the results revealed that the photocatalytic activity was enhanced when titania was doped with vanadium.

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Photocatalytic removal of chromium(VI) and sulfite using transition metal (Cu, Fe, Zn) doped TiO2 driven by visible light: Feasibility, mechanism and kinetics

Cited by 53 publications

References 66 publications

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Photocatalytic Properties of Core-Shell Structured Wool-TiO2 Hybrid Composite Powders

Synthesis of Oxygen Deficient TiO2 for Improved Photocatalytic Efficiency in Solar Radiation

Vanadium doped titania nanoparticles for photocatalytic removal of heavy metals from aqueous solutions

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