Visible-light driven graphene oxide/titanium dioxide hydrogels for photocatalytic reduction of nitrite

Sheng Ruei Huang; Po Jung Huang

doi:10.1016/j.jece.2021.106902

Visible-light driven graphene oxide/titanium dioxide hydrogels for photocatalytic reduction of nitrite

Sheng Ruei Huang, Po Jung Huang

Department of Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Photocatalysis is particularly suitable for removing nitrite (NO₂⁻) under irradiation from liquid samples. A reusable photocatalyst gel with high conversion selectivity is currently not available. This study investigated graphene oxide (GO)/titanium dioxide (TiO₂)/polyethylene diacrylate (PEGDA) hydrogels (GTHs) as a reusable catalyst, which can degrade NO₂⁻ into nitrogen gas (N₂) under visible light. GO-modified TiO₂ can narrow the energy band gap of TiO₂ from 3.39 to 2.89 eV and achieve a NO₂⁻ removal efficiency of more than 98% in 6 h under light-emitting diode irradiation. Formic acid used as a hole scavenger achieved a N₂ selectivity of 75.6 ± 1.1%. The NO₂⁻ removal efficiency and N₂ selectivity of GTHs were not affected by high salinity water. GTHs can eliminate 94.0 ± 2.0% NO₂⁻ and achieve a N₂ selectivity of 64.9 ± 2.1%. After ten cycles, GTHs retained a removal efficiency of 80–90%. The results indicate that GTHs are a promising material for wastewater treatment.

Original language	English
Article number	106902
Journal	Journal of Environmental Chemical Engineering
Volume	10
Issue number	1
DOIs	https://doi.org/10.1016/j.jece.2021.106902
State	Published - Feb 2022

Keywords

Graphene oxide/TiO
N selectivity
Nitrite
Photolytic reduction
Visible light

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title = "Visible-light driven graphene oxide/titanium dioxide hydrogels for photocatalytic reduction of nitrite",

abstract = "Photocatalysis is particularly suitable for removing nitrite (NO2−) under irradiation from liquid samples. A reusable photocatalyst gel with high conversion selectivity is currently not available. This study investigated graphene oxide (GO)/titanium dioxide (TiO2)/polyethylene diacrylate (PEGDA) hydrogels (GTHs) as a reusable catalyst, which can degrade NO2− into nitrogen gas (N2) under visible light. GO-modified TiO2 can narrow the energy band gap of TiO2 from 3.39 to 2.89 eV and achieve a NO2− removal efficiency of more than 98% in 6 h under light-emitting diode irradiation. Formic acid used as a hole scavenger achieved a N2 selectivity of 75.6 ± 1.1%. The NO2− removal efficiency and N2 selectivity of GTHs were not affected by high salinity water. GTHs can eliminate 94.0 ± 2.0% NO2− and achieve a N2 selectivity of 64.9 ± 2.1%. After ten cycles, GTHs retained a removal efficiency of 80–90%. The results indicate that GTHs are a promising material for wastewater treatment.",

keywords = "Graphene oxide/TiO, N selectivity, Nitrite, Photolytic reduction, Visible light",

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AU - Huang, Po Jung

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N2 - Photocatalysis is particularly suitable for removing nitrite (NO2−) under irradiation from liquid samples. A reusable photocatalyst gel with high conversion selectivity is currently not available. This study investigated graphene oxide (GO)/titanium dioxide (TiO2)/polyethylene diacrylate (PEGDA) hydrogels (GTHs) as a reusable catalyst, which can degrade NO2− into nitrogen gas (N2) under visible light. GO-modified TiO2 can narrow the energy band gap of TiO2 from 3.39 to 2.89 eV and achieve a NO2− removal efficiency of more than 98% in 6 h under light-emitting diode irradiation. Formic acid used as a hole scavenger achieved a N2 selectivity of 75.6 ± 1.1%. The NO2− removal efficiency and N2 selectivity of GTHs were not affected by high salinity water. GTHs can eliminate 94.0 ± 2.0% NO2− and achieve a N2 selectivity of 64.9 ± 2.1%. After ten cycles, GTHs retained a removal efficiency of 80–90%. The results indicate that GTHs are a promising material for wastewater treatment.

AB - Photocatalysis is particularly suitable for removing nitrite (NO2−) under irradiation from liquid samples. A reusable photocatalyst gel with high conversion selectivity is currently not available. This study investigated graphene oxide (GO)/titanium dioxide (TiO2)/polyethylene diacrylate (PEGDA) hydrogels (GTHs) as a reusable catalyst, which can degrade NO2− into nitrogen gas (N2) under visible light. GO-modified TiO2 can narrow the energy band gap of TiO2 from 3.39 to 2.89 eV and achieve a NO2− removal efficiency of more than 98% in 6 h under light-emitting diode irradiation. Formic acid used as a hole scavenger achieved a N2 selectivity of 75.6 ± 1.1%. The NO2− removal efficiency and N2 selectivity of GTHs were not affected by high salinity water. GTHs can eliminate 94.0 ± 2.0% NO2− and achieve a N2 selectivity of 64.9 ± 2.1%. After ten cycles, GTHs retained a removal efficiency of 80–90%. The results indicate that GTHs are a promising material for wastewater treatment.

KW - Graphene oxide/TiO

KW - N selectivity

KW - Nitrite

KW - Photolytic reduction

KW - Visible light

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Visible-light driven graphene oxide/titanium dioxide hydrogels for photocatalytic reduction of nitrite

Abstract

Keywords

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