Three-dimensional ordered macroporous bismuth vanadates: PMMA-templating fabrication and excellent visible light-driven photocatalytic performance for phenol degradation

Yuxi Liu; Hongxing Dai; Jiguang Deng; Lei Zhang; Chak Tong Au

doi:10.1039/c2nr12046a

Three-dimensional ordered macroporous bismuth vanadates: PMMA-templating fabrication and excellent visible light-driven photocatalytic performance for phenol degradation

Yuxi Liu, Hongxing Dai^*, Jiguang Deng, Lei Zhang, Chak Tong Au

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

98 Citations (Scopus)

Abstract

Three-dimension ordered macroporous (3D-OM) bismuth vanadates with a monoclinic crystal structure and high surface area (18-24 m ² g ^-1) have been prepared using ascorbic acid (AA)- or citric acid (CA)-assisted poly(methyl methacrylate) (PMMA)-templating strategy with bismuth nitrate and ammonium metavanadate as the metal sources, HNO ₃ as the pH adjuster and ethylene glycol and methanol as the solvent. The materials were characterized by a number of analytical techniques. The photocatalytic performance of the porous BiVO ₄ samples was evaluated for the degradation of phenol in the presence of a small amount of H ₂O ₂ under visible light illumination. The effects of the initial phenol concentration and the H ₂O ₂ amount on the photocatalytic activity of the photocatalyst were examined. It is shown that the chelating agent, AA or CA, and the amount in which it is added had a significant impact on the quality of the 3D-OM structure, with a "(Bi + V):chelating agent" molar ratio of 2:1 being the most appropriate. Among the as-prepared BiVO ₄ samples, the one with a surface area of ca. 24 m ² g ^-1 showed the best visible light-driven photocatalytic performance for phenol degradation (phenol conversion = ca. 94% at phenol concentration = 0.1 mmol L ^-1 and in the presence of 0.6 mL H ₂O ₂). A higher phenol conversion could be achieved within the same reaction time if the phenol concentration in the aqueous solution was lowered, but an excess amount of H ₂O ₂ was not a favorable factor for the enhancement of the catalytic activity. It is concluded that the excellent photocatalytic activity of 3D-OM BiVO ₄ is due to the high quality 3D-OM structured BiVO ₄ that has a high surface area and surface oxygen vacancy density. We are sure that the 3D-OM material is a promising photocatalyst for the removal of organics from wastewater under visible light illumination.

Original language	English
Pages (from-to)	2317-2325
Number of pages	9
Journal	Nanoscale
Volume	4
Issue number	7
DOIs	https://doi.org/10.1039/c2nr12046a
Publication status	Published - 7 Apr 2012

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General Materials Science

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@article{3913b1fbc7744b11a7a50111cbb00eff,

title = "Three-dimensional ordered macroporous bismuth vanadates: PMMA-templating fabrication and excellent visible light-driven photocatalytic performance for phenol degradation",

abstract = "Three-dimension ordered macroporous (3D-OM) bismuth vanadates with a monoclinic crystal structure and high surface area (18-24 m 2 g -1) have been prepared using ascorbic acid (AA)- or citric acid (CA)-assisted poly(methyl methacrylate) (PMMA)-templating strategy with bismuth nitrate and ammonium metavanadate as the metal sources, HNO 3 as the pH adjuster and ethylene glycol and methanol as the solvent. The materials were characterized by a number of analytical techniques. The photocatalytic performance of the porous BiVO 4 samples was evaluated for the degradation of phenol in the presence of a small amount of H 2O 2 under visible light illumination. The effects of the initial phenol concentration and the H 2O 2 amount on the photocatalytic activity of the photocatalyst were examined. It is shown that the chelating agent, AA or CA, and the amount in which it is added had a significant impact on the quality of the 3D-OM structure, with a {"}(Bi + V):chelating agent{"} molar ratio of 2:1 being the most appropriate. Among the as-prepared BiVO 4 samples, the one with a surface area of ca. 24 m 2 g -1 showed the best visible light-driven photocatalytic performance for phenol degradation (phenol conversion = ca. 94% at phenol concentration = 0.1 mmol L -1 and in the presence of 0.6 mL H 2O 2). A higher phenol conversion could be achieved within the same reaction time if the phenol concentration in the aqueous solution was lowered, but an excess amount of H 2O 2 was not a favorable factor for the enhancement of the catalytic activity. It is concluded that the excellent photocatalytic activity of 3D-OM BiVO 4 is due to the high quality 3D-OM structured BiVO 4 that has a high surface area and surface oxygen vacancy density. We are sure that the 3D-OM material is a promising photocatalyst for the removal of organics from wastewater under visible light illumination.",

author = "Yuxi Liu and Hongxing Dai and Jiguang Deng and Lei Zhang and Au, {Chak Tong}",

year = "2012",

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doi = "10.1039/c2nr12046a",

language = "English",

volume = "4",

pages = "2317--2325",

journal = "Nanoscale",

issn = "2040-3364",

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TY - JOUR

T1 - Three-dimensional ordered macroporous bismuth vanadates

T2 - PMMA-templating fabrication and excellent visible light-driven photocatalytic performance for phenol degradation

AU - Liu, Yuxi

AU - Dai, Hongxing

AU - Deng, Jiguang

AU - Zhang, Lei

AU - Au, Chak Tong

PY - 2012/4/7

Y1 - 2012/4/7

N2 - Three-dimension ordered macroporous (3D-OM) bismuth vanadates with a monoclinic crystal structure and high surface area (18-24 m 2 g -1) have been prepared using ascorbic acid (AA)- or citric acid (CA)-assisted poly(methyl methacrylate) (PMMA)-templating strategy with bismuth nitrate and ammonium metavanadate as the metal sources, HNO 3 as the pH adjuster and ethylene glycol and methanol as the solvent. The materials were characterized by a number of analytical techniques. The photocatalytic performance of the porous BiVO 4 samples was evaluated for the degradation of phenol in the presence of a small amount of H 2O 2 under visible light illumination. The effects of the initial phenol concentration and the H 2O 2 amount on the photocatalytic activity of the photocatalyst were examined. It is shown that the chelating agent, AA or CA, and the amount in which it is added had a significant impact on the quality of the 3D-OM structure, with a "(Bi + V):chelating agent" molar ratio of 2:1 being the most appropriate. Among the as-prepared BiVO 4 samples, the one with a surface area of ca. 24 m 2 g -1 showed the best visible light-driven photocatalytic performance for phenol degradation (phenol conversion = ca. 94% at phenol concentration = 0.1 mmol L -1 and in the presence of 0.6 mL H 2O 2). A higher phenol conversion could be achieved within the same reaction time if the phenol concentration in the aqueous solution was lowered, but an excess amount of H 2O 2 was not a favorable factor for the enhancement of the catalytic activity. It is concluded that the excellent photocatalytic activity of 3D-OM BiVO 4 is due to the high quality 3D-OM structured BiVO 4 that has a high surface area and surface oxygen vacancy density. We are sure that the 3D-OM material is a promising photocatalyst for the removal of organics from wastewater under visible light illumination.

AB - Three-dimension ordered macroporous (3D-OM) bismuth vanadates with a monoclinic crystal structure and high surface area (18-24 m 2 g -1) have been prepared using ascorbic acid (AA)- or citric acid (CA)-assisted poly(methyl methacrylate) (PMMA)-templating strategy with bismuth nitrate and ammonium metavanadate as the metal sources, HNO 3 as the pH adjuster and ethylene glycol and methanol as the solvent. The materials were characterized by a number of analytical techniques. The photocatalytic performance of the porous BiVO 4 samples was evaluated for the degradation of phenol in the presence of a small amount of H 2O 2 under visible light illumination. The effects of the initial phenol concentration and the H 2O 2 amount on the photocatalytic activity of the photocatalyst were examined. It is shown that the chelating agent, AA or CA, and the amount in which it is added had a significant impact on the quality of the 3D-OM structure, with a "(Bi + V):chelating agent" molar ratio of 2:1 being the most appropriate. Among the as-prepared BiVO 4 samples, the one with a surface area of ca. 24 m 2 g -1 showed the best visible light-driven photocatalytic performance for phenol degradation (phenol conversion = ca. 94% at phenol concentration = 0.1 mmol L -1 and in the presence of 0.6 mL H 2O 2). A higher phenol conversion could be achieved within the same reaction time if the phenol concentration in the aqueous solution was lowered, but an excess amount of H 2O 2 was not a favorable factor for the enhancement of the catalytic activity. It is concluded that the excellent photocatalytic activity of 3D-OM BiVO 4 is due to the high quality 3D-OM structured BiVO 4 that has a high surface area and surface oxygen vacancy density. We are sure that the 3D-OM material is a promising photocatalyst for the removal of organics from wastewater under visible light illumination.

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DO - 10.1039/c2nr12046a

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AN - SCOPUS:84861847291

SN - 2040-3364

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JO - Nanoscale

JF - Nanoscale

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Three-dimensional ordered macroporous bismuth vanadates: PMMA-templating fabrication and excellent visible light-driven photocatalytic performance for phenol degradation

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