Promoted hexavalent chromium ion photoreduction over visible-light active RuO2/TiO2 heterojunctions prepared by solution process

Shawky, Ahmed; Alsheheri, Soad Z.; Alsaggaf, Wejdan T.; Al-Hajji, L.A.; Zaki, Z.I.

doi:10.1016/j.jphotochem.2022.113906

Cited by 22 publications

(4 citation statements)

References 65 publications

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“…1−8 The requisite for efficient technologies to degrade harmful contaminants in the ecosystem has inspired researchers to develop cost-effective green catalysts of nano dimensions. 9,10 Photocatalysis has been developed as an oxidation technology with benefits such as low energy consumption and no subsidiary pollutants and is indeed an environment-friendly water treatment method. 11,12 This process utilizes solar energy that generates holes and electrons which can further induce the formation of reactive oxygen species that easily reduce metal ions and decompose pollutants.…”

Section: Introductionmentioning

confidence: 99%

“…The contaminants in the water resources are difficult to remove due to the complex structure and have a huge tendency of accumulation in the environment. Heavy metal ions such as Cr +6 , As 3+ , Pb 2+ , and Hg 2+ and synthetic dyes from the textile industries, organic pollutants, etc., cause serious physiological threats to living organisms. − The requisite for efficient technologies to degrade harmful contaminants in the ecosystem has inspired researchers to develop cost-effective green catalysts of nano dimensions. , Photocatalysis has been developed as an oxidation technology with benefits such as low energy consumption and no subsidiary pollutants and is indeed an environment-friendly water treatment method. , This process utilizes solar energy that generates holes and electrons which can further induce the formation of reactive oxygen species that easily reduce metal ions and decompose pollutants. ,, Perovskite oxides are considered new-age multifunctional materials with several applications that include thermoelectrics, hydrogen generation, photodegradation of pollutants, CO 2 reduction, etc. − …”

Section: Introductionmentioning

confidence: 99%

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Nanocubic Copper-Doped SrTiO₃ for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

P. I,

Shenoy,

Bhat

2023

ACS Appl. Nano Mater.

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Visible light photocatalysis using nanomaterials is a pragmatic approach for efficiently eliminating pollutants as environmental pollution is a major stumbling block. The wide band gap of SrTiO 3 is permuted to an appropriate value by adding a suitable dopant to make it function as a visible light photocatalyst. Nanocubic copper-doped strontium titanate was prepared through a single-pot solvothermal route and tested for its photocatalytic activity. An exceptional 99% photoreduction of Cr(VI) ions to Cr(III) within 15 min and 100% in 25 min and 99% photodegradation of the methyl violet dye within 120 min was observed for the 0.5 CuST sample. First principles density functional theory calculation reveals the reduced band gap of the doped samples due to the introduction of additional energy levels above the valence band edge to be the reason behind the increased photocatalytic efficiency. In addition to this, the three-fold increase in surface area and low recombination rate of charge carriers in the doped nanocubes also favor in enhancing the activity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanocubic Copper-Doped SrTiO₃ for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

P. I,

Shenoy,

Bhat

2023

ACS Appl. Nano Mater.

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“…Researchers have also synthesized mesoporous V 2 O 5 /g-C 3 N 4 nanocomposites for reduction of Hg II ions under visible light. [19] Bi 2 S 3 /TiO 2 nanostructures, [20] S-Scheme based 2D MoS 2 /TiO 2 [21] RuO 2 /TiO 2 heterojunction [22] were used by Shawky and co-workers for photocatalytic reduction of Cr VI form under the visible light irradiation. Thongmee et al was fabricated ZnO/ rGO nanocomposite by varying the concentration of rGO and successfully removed Cr VI via photocatalytic way.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Reduction of Cr ^VI by TiO₂/GO Nanocomposite

et al. 2022

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Graphene Oxide (GO) was successfully deposited on TiO2 NPs through sol‐gel process. The fabricated TiO2/GO (T/G) nanocomposite was used for reduction of CrVI under simulated solar light illumination. 10 wt. % GO was used for the preparation of T/ G nanocomposite. Several analytical methods such as powder X‐ray diffraction (PXRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and UV‐visible diffuse reflectance spectra (DRS) spectrophotometer was used to characterize the samples. The PXRD revealed the formation of the anatase phase of TiO2 NPs and T/G nanocomposites, as per literature more favourable form of TiO2 for photocatalytic activity. The average crystallite size was found 5.1 nm and 23 nm for TiO2 NPs and T/G nanocomposite respectively. Under the simulated sunlight illumination, the TiO2 NPs was excited to generate the electron‐hole pairs and then the photo‐generated electron transferred by the GO to the CrVI which further converted into CrIII. The band gap for T/G nanocomposite was calculated 2.92 eV. Under visible light,27.3 % photoreduction of (10 mg/L) CrVI solution at λmax=347 nm was achieved within 90 min on the T/G sample at the pH 5–6 while overall reduction was 48 % including adsorption. The rate of reaction was found 0.00305 min−1 and the order of reaction was pseudo first order.

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“…Hence, it is essential to balance the design and construction of the photocatalytic materials with significant carrier transference and broad-spectrum response to visible light [22][23][24][25][26]. Recently, the TiO 2 -based heterostructures revealed a magnificent photocatalytic reduction of heavy metal ions such as Cr (VI) with superb performance and recyclability [27].…”

Section: Introductionmentioning

confidence: 99%

Visible-light responsive ZnSe-anchored mesoporous TiO₂ heterostructures for boosted photocatalytic reduction of Cr(VI)

et al. 2022

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The accumulation of Cr(VI) ions in water can cause serious influences on the environment and human health. This work reports a humble synthesis of ZnSe nanoparticles anchored to the sol-gel prepared TiO2 for visible-light-driven photocatalytic reduction of Cr(VI) ions. The 7.9 nm ZnSe nanoparticles were attached to TiO2 surfaces at a content of 1.0−4.0 wt. % as experiential by TEM investigation. The designed nanocomposite unveiled mesostructured surfaces exhibiting surface areas of 176−210 m2g−1. The impregnation of ZnSe amended the visible-light absorption of TiO2 due to the bandgap decrease from 3.14 to 2.90 eV. The photocatalytic reduction of Cr(VI) applying the optimized portion of 3.0 wt.% ZnSe/TiO2 was achieved at 177 µmol min−1. This photocatalytic activity is higher than the common Degussa P25 and pristine TiO2 by 20 and 30 times, respectively. The improved performance is signified by the efficient interfacial separation of charge carriers by the introduction of ZnSe. This innovative ZnSe/TiO2 has also shown photocatalytic stability for five consecutive runs.

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Promoted hexavalent chromium ion photoreduction over visible-light active RuO2/TiO2 heterojunctions prepared by solution process

Cited by 22 publications

References 65 publications

Nanocubic Copper-Doped SrTiO₃ for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

Nanocubic Copper-Doped SrTiO₃ for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

Photocatalytic Reduction of Cr ^VI by TiO₂/GO Nanocomposite

Visible-light responsive ZnSe-anchored mesoporous TiO₂ heterostructures for boosted photocatalytic reduction of Cr(VI)

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Promoted hexavalent chromium ion photoreduction over visible-light active RuO2/TiO2 heterojunctions prepared by solution process

Cited by 22 publications

References 65 publications

Nanocubic Copper-Doped SrTiO3 for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

Nanocubic Copper-Doped SrTiO3 for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

Photocatalytic Reduction of Cr VI by TiO2/GO Nanocomposite

Visible-light responsive ZnSe-anchored mesoporous TiO2 heterostructures for boosted photocatalytic reduction of Cr(VI)

Contact Info

Product

Resources

About

Nanocubic Copper-Doped SrTiO₃ for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

Nanocubic Copper-Doped SrTiO₃ for Photoreduction of Cr(VI) and Photodegradation of Methyl Violet

Photocatalytic Reduction of Cr ^VI by TiO₂/GO Nanocomposite

Visible-light responsive ZnSe-anchored mesoporous TiO₂ heterostructures for boosted photocatalytic reduction of Cr(VI)