Preparation and photocatalytic properties of Bi-doped TiO2/montmorillonite composite

Xiang, Haichun; Tuo, Biyang; Tian, Jinwang; Hu, Keming; Wang, Jianli; Cheng, Jiangguo; Tang, Yun

doi:10.1016/j.optmat.2021.111137

Cited by 24 publications

(12 citation statements)

References 50 publications

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“…However, a slight change in the crystallite size may be attributed to the following reasons due to slight doping of the Bi ion into the TiO 2 lattice as also observed in many literature. 41,43 The Kubelka−Munk function was used with diffuse reflective spectra to measure the band gap of semiconducting materials. Equation 2 mentioned below is used to determine the band gap values.…”

Section: Resultsmentioning

confidence: 99%

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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The growing world population is closely associated with the increased demand of safe drinking water and sustainable energy production. This drives the focus of the scientific community to work toward water remediation and clean energy generation. The combination of photoelectrooxidation of pollutants at the anode with simultaneous hydrogen gas production at the cathode is a smart strategy to address these problems. Herein, we have designed a bifunctional photoelectrocatalytic system consisting of a self-standing photoanode to degrade the water pollutant molecules with simultaneous production of molecular hydrogen at the cathode. The photoanode was prepared by coating Bi2O3 over the surface of self-standing TiO2 nanorods. Thus, prepared photoelectrodes show high degradation efficiency for rhodamine molecules, where direct oxidation of rhodamine by the holes generated under solar light illumination was detrimental for its activity. During simultaneous pollutant removal and energy production experiments, the anode shows 100% degradation of pollutant molecules while the cathode shows high hydrogen gas production (128 mM cm–2 h–1). The prepared composite showed higher efficiency of visible-light absorbance, high charge generation capability, and low charge transfer resistance at the interface as determined via several characterizations, compared to the bare titania. The catalyst is easy to prepare and robust in activity for several kinds of pollutant molecules tested. Its robust activity, high stability, and durability open up an avenue for the wastewater treatment with simultaneous renewable energy production technologies.

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Section: Resultsmentioning

confidence: 99%

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Kaushik

Gandhi

Halder

2023

ACS Appl. Nano Mater.

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“…Some experiments on the sensitization and doping of TiO 2 /clay as a strategy for enhancing photocatalytic efficiency related to the light range and electron hole recombination have been conducted. The use of a ruthenium complex significantly improved the activation capability of TiO 2 /saponite in the visible light region [ 196 ]; moreover, the increased band gap energy was achieved by the doping of TiO 2 /montmorillonite and TiO 2 /Kaolinite with Bi [ 197 ], W [ 153 ], Fe, and N [ 198 , 199 , 200 ]. W-doped TiO 2 /montmorillonite demonstrated a removal efficiency of atrazine of about 40% under visible light; however, undoped TiO 2 /montmorillonite was almost totally inactive [ 153 ].…”

Section: Clay-supported Metal Oxide In Aopsmentioning

confidence: 99%

Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review

et al. 2022

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Advanced oxidation processes (AOPs) utilizing heterogeneous catalysts have attracted great attention in the last decade. The use of solid catalysts, including metal and metal oxide nanoparticle support materials, exhibited better performance compared with the use of homogeneous catalysts, which is mainly related to their stability in hostile environments and recyclability and reusability. Various solid supports have been reported to enhance the performance of metal and metal oxide catalysts for AOPs; undoubtedly, the utilization of clay as a support is the priority under consideration and has received intensive interest. This review provides up-to-date progress on the synthesis, features, and future perspectives of clay-supported metal and metal oxide for AOPs. The methods and characteristics of metal and metal oxide incorporated into the clay structure are strongly influenced by various factors in the synthesis, including the kind of clay mineral. In addition, the benefits of nanomaterials from a green chemistry perspective are key aspects for their further considerations in various applications. Special emphasis is given to the basic schemes for clay modifications and role of clay supports for the enhanced mechanism of AOPs. The scaling-up issue is suggested for being studied to further applications at industrial scale.

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“…In addition, photocatalytic activity is closely related to the behavior of photocarriers [45,46]. Subsequently, electrons (e − ) gathered on the surface of TiO 2 react with dissolved oxygen molecules in water to generate the superoxide radical anion •O 2 − and other high oxidation groups.…”

Section: Photocatalytic Studymentioning

confidence: 99%

“…At the same time, the negat interlayer surface of hectorite is conducive to improving the photocatalytic the photogenerated holes can migrate to the surface quickly under the electro on the negatively charged interlayer surface. In addition, photocatalytic activity is closely related to the behavior of [45,46]. Subsequently, electrons (e − ) gathered on the surface of TiO2 react w oxygen molecules in water to generate the superoxide radical anion •O2 − a oxidation groups.…”

Section: Photocatalytic Studymentioning

confidence: 99%

One-Pot Synthesis of TiO2/Hectorite Composite and Its Photocatalytic Degradation of Methylene Blue

et al. 2022

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TiO2/hectorite composite photocatalysts with different molar ratios of lithium, magnesium, and silicon were synthesized by a one-pot hydrothermal method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N2 adsorption-desorption isotherms, and ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS). When the molar ratio of lithium, magnesium, and silicon was 1.32:5.34:8 (TH-2), the composite showed the highest UV photocatalytic degradation of methylene blue (MB). The apparent rate constant of TH-2 was 0.04361 min−1, which was about 3.12 times that of EVONIK Degussa commercial TiO2 of AEROXIDE P25. The improvement of photocatalytic efficiency of the composite was mainly due to its high specific surface area, light trapping ability, and effective separation of electrons (e−) and holes (h+). At the same time, the F element of hectorite is beneficial to the formation of Ti3+ in TiO2, thus enhancing the photocatalytic activity. After five cycles, the removal rate of MB with TH-2 still reached 87.9%, indicating its excellent reusability.

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Preparation and photocatalytic properties of Bi-doped TiO2/montmorillonite composite

Cited by 24 publications

References 50 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review

One-Pot Synthesis of TiO2/Hectorite Composite and Its Photocatalytic Degradation of Methylene Blue

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Preparation and photocatalytic properties of Bi-doped TiO2/montmorillonite composite

Cited by 24 publications

References 50 publications

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi2O3/TiO2 Nanoparticle Arrays

Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review

One-Pot Synthesis of TiO2/Hectorite Composite and Its Photocatalytic Degradation of Methylene Blue

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Product

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Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays

Photoelectrochemical Degradation of Organic Pollutants Coupled with Molecular Hydrogen Generation Using Bi₂O₃/TiO₂ Nanoparticle Arrays