Defining the role of substituents on adsorption and photocatalytic degradation of phenolic compounds

A. Tolosana-Moranchel; J. A. Anderson; J. A. Casas; M. Faraldos; A. Bahamonde

doi:10.1016/j.jece.2017.08.053

Defining the role of substituents on adsorption and photocatalytic degradation of phenolic compounds

A. Tolosana-Moranchel, J. A. Anderson, J. A. Casas, M. Faraldos, A. Bahamonde^*

^*Corresponding author for this work

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

22 Citations (Scopus)

Abstract

The influence of adsorption behavior and the chemical nature of different para-positioned substituents was analyzed in the photocatalytic decomposition of phenol and other phenolic compounds (4-chlorophenol, 4-nitrophenol and methyl-p-hydroxybenzoato). Five commercial TiO₂ photocatalysts, with differences in their physico-chemical properties, were selected for comparative purpose: P25 Aeroxide^®, P25/20 VP Aeroperl^® and P90 Aeroxide^®, provided by Evonik Company, and UV 100 from Hombikak and PC 105 from Crystal Global. On the basis of adsorption isotherms it can be concluded that the maximum uptake of the different organic compounds are directly related to the specific surface area and surface acidity of the titania. Infrared spectroscopy in diffuse reflectance mode (DRIFTS) shows that the phenolic compounds are mainly adsorbed via interactions between the phenolic -OH group and TiO₂ surface leading to formation of Ti-phenolates and Ti-OH. The photocatalytic removal of the phenolic compounds for the different titania samples does not follow a ranking based on the extent of adsorption whereas the initial photodegradation rate was strongly dependent on the chemical nature of the substituent, and could be correlated with the corresponding Hammett constant.

Original language	English
Pages (from-to)	4612-4620
Number of pages	9
Journal	Journal of Environmental Chemical Engineering
Volume	5
Issue number	5
Early online date	5 Sept 2017
DOIs	https://doi.org/10.1016/j.jece.2017.08.053
Publication status	Published - 1 Oct 2017

Bibliographical note

This work has been supported by the Spanish Plan Nacional de I+D+i through the project CTM2015-64895-R. Alvaro Tolosana-Moranchel thanks to Ministerio de Educación, Cultura y Deporte for his FPU grant (FPU14/01605). The authors are also grateful to Technical Research Support Unit of Instituto de Catálisis y Petroleoquímica (CSIC).

Keywords

Adsorption
DRIFTS
Hammett constant
Phenolic compounds
Photocatalysis
TiO

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title = "Defining the role of substituents on adsorption and photocatalytic degradation of phenolic compounds",

abstract = "The influence of adsorption behavior and the chemical nature of different para-positioned substituents was analyzed in the photocatalytic decomposition of phenol and other phenolic compounds (4-chlorophenol, 4-nitrophenol and methyl-p-hydroxybenzoato). Five commercial TiO2 photocatalysts, with differences in their physico-chemical properties, were selected for comparative purpose: P25 Aeroxide{\textregistered}, P25/20 VP Aeroperl{\textregistered} and P90 Aeroxide{\textregistered}, provided by Evonik Company, and UV 100 from Hombikak and PC 105 from Crystal Global. On the basis of adsorption isotherms it can be concluded that the maximum uptake of the different organic compounds are directly related to the specific surface area and surface acidity of the titania. Infrared spectroscopy in diffuse reflectance mode (DRIFTS) shows that the phenolic compounds are mainly adsorbed via interactions between the phenolic -OH group and TiO2 surface leading to formation of Ti-phenolates and Ti-OH. The photocatalytic removal of the phenolic compounds for the different titania samples does not follow a ranking based on the extent of adsorption whereas the initial photodegradation rate was strongly dependent on the chemical nature of the substituent, and could be correlated with the corresponding Hammett constant.",

keywords = "Adsorption, DRIFTS, Hammett constant, Phenolic compounds, Photocatalysis, TiO",

author = "A. Tolosana-Moranchel and Anderson, {J. A.} and Casas, {J. A.} and M. Faraldos and A. Bahamonde",

note = "This work has been supported by the Spanish Plan Nacional de I+D+i through the project CTM2015-64895-R. Alvaro Tolosana-Moranchel thanks to Ministerio de Educaci{\'o}n, Cultura y Deporte for his FPU grant (FPU14/01605). The authors are also grateful to Technical Research Support Unit of Instituto de Cat{\'a}lisis y Petroleoqu{\'i}mica (CSIC).",

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AU - Tolosana-Moranchel, A.

AU - Anderson, J. A.

AU - Casas, J. A.

AU - Faraldos, M.

AU - Bahamonde, A.

N1 - This work has been supported by the Spanish Plan Nacional de I+D+i through the project CTM2015-64895-R. Alvaro Tolosana-Moranchel thanks to Ministerio de Educación, Cultura y Deporte for his FPU grant (FPU14/01605). The authors are also grateful to Technical Research Support Unit of Instituto de Catálisis y Petroleoquímica (CSIC).

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N2 - The influence of adsorption behavior and the chemical nature of different para-positioned substituents was analyzed in the photocatalytic decomposition of phenol and other phenolic compounds (4-chlorophenol, 4-nitrophenol and methyl-p-hydroxybenzoato). Five commercial TiO2 photocatalysts, with differences in their physico-chemical properties, were selected for comparative purpose: P25 Aeroxide®, P25/20 VP Aeroperl® and P90 Aeroxide®, provided by Evonik Company, and UV 100 from Hombikak and PC 105 from Crystal Global. On the basis of adsorption isotherms it can be concluded that the maximum uptake of the different organic compounds are directly related to the specific surface area and surface acidity of the titania. Infrared spectroscopy in diffuse reflectance mode (DRIFTS) shows that the phenolic compounds are mainly adsorbed via interactions between the phenolic -OH group and TiO2 surface leading to formation of Ti-phenolates and Ti-OH. The photocatalytic removal of the phenolic compounds for the different titania samples does not follow a ranking based on the extent of adsorption whereas the initial photodegradation rate was strongly dependent on the chemical nature of the substituent, and could be correlated with the corresponding Hammett constant.

AB - The influence of adsorption behavior and the chemical nature of different para-positioned substituents was analyzed in the photocatalytic decomposition of phenol and other phenolic compounds (4-chlorophenol, 4-nitrophenol and methyl-p-hydroxybenzoato). Five commercial TiO2 photocatalysts, with differences in their physico-chemical properties, were selected for comparative purpose: P25 Aeroxide®, P25/20 VP Aeroperl® and P90 Aeroxide®, provided by Evonik Company, and UV 100 from Hombikak and PC 105 from Crystal Global. On the basis of adsorption isotherms it can be concluded that the maximum uptake of the different organic compounds are directly related to the specific surface area and surface acidity of the titania. Infrared spectroscopy in diffuse reflectance mode (DRIFTS) shows that the phenolic compounds are mainly adsorbed via interactions between the phenolic -OH group and TiO2 surface leading to formation of Ti-phenolates and Ti-OH. The photocatalytic removal of the phenolic compounds for the different titania samples does not follow a ranking based on the extent of adsorption whereas the initial photodegradation rate was strongly dependent on the chemical nature of the substituent, and could be correlated with the corresponding Hammett constant.

KW - Adsorption

KW - DRIFTS

KW - Hammett constant

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KW - Photocatalysis

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Defining the role of substituents on adsorption and photocatalytic degradation of phenolic compounds

Abstract

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Keywords

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