Role of Ni2+ ions in TiO2 and Pt/TiO2 photocatalysis for phenol degradation in aqueous suspensions

Wang, Yaru; Zhao, Jianjun; Xiong, Xianqiang; Liu, Shengwei; Xu, Yiming

doi:10.1016/j.apcatb.2019.117903

Cited by 38 publications

(12 citation statements)

References 38 publications

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“…The conduction band edge potential of WO 3 is −0.42 V vs normal hydrogen electrode (NHE) which is more negative than the oxidation potential of one electron −0.33 V vs NHE. 18,19 Meanwhile, the valence band oxidation potential is 2.4 V vs NHE. 18 Due to its superior band structures and nontoxicity, WO 3 has been potentially used in gas sensing, anode materials in batteries, photochromic devices, electrochromic devices, and photocatalytic applications.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The heterogeneous photocatalyst can significantly delay the electron–hole recombination rates, which will enhance the photocatalytic activity of the nanocomposites. , Among the many sunlight-active photocatalysts, tungsten oxide (WO 3 ) is a promising inorganic metal oxide semiconductor photocatalyst. The conduction band edge potential of WO 3 is −0.42 V vs normal hydrogen electrode (NHE) which is more negative than the oxidation potential of one electron −0.33 V vs NHE. , Meanwhile, the valence band oxidation potential is 2.4 V vs NHE . Due to its superior band structures and nontoxicity, WO 3 has been potentially used in gas sensing, anode materials in batteries, photochromic devices, electrochromic devices, and photocatalytic applications. − As we mentioned above, by adding a cocatalyst to the catalyst, the efficiency has been increased.…”

Section: Introductionmentioning

confidence: 99%

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Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Ramar

Karthikeyan

2021

ACS Appl. Nano Mater.

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The addition of reduced graphene oxide (rGO) into semiconducting metal oxide nanomaterials is a trending material that has been used in a wide range of applications to improve the efficiency of metal oxides. In this present work, we synthesize rGO/WO3 nanohybrids via a simple one-step hydrothermal route. During the hydrothermal treatment, the subsequent in situ reduction of GO into rGO occurred in Millipore water without using any surfactant or reducing agents. A high-resolution transmission electron microscope investigated the morphology of the prepared samples. The phase formation was confirmed by X-ray diffraction pattern and Raman spectroscopy. To assess the photocatalytic activity, prepared samples were used to suppress methylene blue (MB) dye under sunlight irradiation. From the results, the WR3 (i.e., WO3 + 30 mg GO) shows a higher catalytic activity for MB degradation. The constant rate values of WR3 (i.e., WO3 + 30 mg GO) also increased to ∼6.5 times compared to WO3. The enhanced catalytic activity of the prepared samples is due to the synergistic effect induced electron–hole recombination delay in the nanocomposites, which is confirmed from the photoluminescence spectroscopy. To probe the active species involved in photocatalysis, in situ scavenger studies were done. A two-route photocatalytic mechanism was proposed to explain the photocatalytic reaction.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Ramar

Karthikeyan

2021

ACS Appl. Nano Mater.

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“…Water pollutant and greenhouse gases emissions cause severe environmental crisis and threaten human health. − Acid organic wastewater (AOW), as a typical pollutant, seems difficult to be degraded through a simple, low energy consumption, and eco-friendly process . Recently, AOW can be decomposed by using the semiconductor photocatalysts, such as metal oxides, metal sulfides, carbon-based materials, and metal–organic frameworks . AOW with a catalyst is gradually degraded and finally mineralized to release CO 2 under solar irradiation.…”

Section: Introductionmentioning

confidence: 99%

Converting Organic Wastewater into CO Using MOFs-Derived Co/In₂O₃ Double-Shell Photocatalyst

Liang

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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The photocatalytic conversion of organic wastewater into value-added chemicals is a promising strategy to solve the environmental issue and energy crisis. Herein, Co/In 2 O 3 nanotubes with a double-shell structure, as a highly efficient photocatalyst, are synthesized by a one-step calcination method. The Co/In 2 O 3 heterostructure shows an outstanding photocatalytic CO 2 reduction performance of 4902 μmol h −1 g −1 . Notably, these Co/In 2 O 3 photocatalysts also achieve CO 2 self-generation and in situ reduction conversion in acid organic wastewater (phenol solution), in which the high CO 2 (47.5 μmol h −1 g −1 ) and CO (0.9 μmol h −1 g −1 ) evolution rates are demonstrated under solar irradiation. Transient photovoltage (TPV) tests demonstrate that Co nanoparticles on Co/ In 2 O 3 double-shell heterostructure serve as the CO 2 reduction sites for the effective capture and stabilization of the photogenerated electrons.

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“…The decrease in efficiency based on the concentration is explained by decreasing the number of active sites of TiO 2 on the surface with increased Ni concentration [65]. With the right amount of Ni clusters on the TiO 2 surface, Ni acts as a co-catalyst by separating and transferring photogenerated charge carriers, thus decreasing the recombination rates compared to those of pure TiO 2 [66].…”

Section: mentioning

confidence: 99%

Influence of Mg, Cu, and Ni Dopants on Amorphous TiO2 Thin Films Photocatalytic Activity

et al. 2020

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The present study investigates Mg (0 ÷ 17.5 wt %), Cu (0 ÷ 21 wt %) and Ni (0 ÷ 20.2 wt %) dopants (M-doped) influence on photocatalytic activity of amorphous TiO2 thin films. Magnetron sputtering was used for the deposition of M-doped TiO2 thin films. According to SEM/EDS surface analysis, the magnetron sputtering technique allows making M-doped TiO2 thin films with high uniformity and high dopant dispersion. Photocatalysis efficiency analysis was set in oxalic acid under UV irradiation. In accordance with the TOC (total organic carbon) measurements followed by the apparent rate constant (kapp) results, the dopants’ concentration peak value was dopant-dependent; for Mg/TiO2, it is 0.9% (kapp—0.01866 cm−1), for Cu/TiO2, it is 0.6% (kapp—0.02221 cm−1), and for Ni/TiO2, it is 0.5% (kapp—0.01317 cm−1). The obtained results clearly state that a concentration of dopants in TiO2 between 0.1% and 0.9% results in optimal photocatalytic activity.

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Role of Ni2+ ions in TiO2 and Pt/TiO2 photocatalysis for phenol degradation in aqueous suspensions

Cited by 38 publications

References 38 publications

Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Converting Organic Wastewater into CO Using MOFs-Derived Co/In₂O₃ Double-Shell Photocatalyst

Influence of Mg, Cu, and Ni Dopants on Amorphous TiO2 Thin Films Photocatalytic Activity

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Role of Ni2+ ions in TiO2 and Pt/TiO2 photocatalysis for phenol degradation in aqueous suspensions

Cited by 38 publications

References 38 publications

Reduced Graphene Oxide/WO3 Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Reduced Graphene Oxide/WO3 Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Converting Organic Wastewater into CO Using MOFs-Derived Co/In2O3 Double-Shell Photocatalyst

Influence of Mg, Cu, and Ni Dopants on Amorphous TiO2 Thin Films Photocatalytic Activity

Contact Info

Product

Resources

About

Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Reduced Graphene Oxide/WO₃ Nanorod Composites for Photocatalytic Degradation of Methylene Blue under Sunlight Irradiation

Converting Organic Wastewater into CO Using MOFs-Derived Co/In₂O₃ Double-Shell Photocatalyst