Photocatalytic hydrogen production from biomass-derived compounds: a case study of citric acid

Ayad F. Alkaim; Tarek A. Kandiel; Ralf Dillert; Detlef W. Bahnemann

doi:10.1080/09593330.2016.1158871

Photocatalytic hydrogen production from biomass-derived compounds: a case study of citric acid

Ayad F. Alkaim^*, Tarek A. Kandiel, Ralf Dillert, Detlef W. Bahnemann

^*Corresponding author for this work

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

40 Scopus citations

Abstract

Highly crystalline anatase TiO₂ nanoparticles with high BET surface area have been synthesized by thermal hydrolysis of titanium(IV) bis(ammoniumlactato) dihydroxide aqueous solutions. The photocatalytic H₂ production from aqueous citric acid (CA) solutions over Pt-loaded TiO₂ has been investigated under different experimental conditions, that is, different CA concentration, temperature, light intensity, and pH of Pt/TiO₂ suspension. For comparison, the photocatalytic dehydrogenation of triethanolamine (TEA) has also been investigated. The highest H₂ production rates were obtained at pH 3 and 9 for CA and TEA, respectively. This behavior is readily explained by the adsorption characteristic of the employed reagent on the surface of the charged TiO₂. The effect of the photocatalyst loading and the light intensity on the H₂ production rate showed the same behavior in the case of CA and TEA evincing that these parameters are catalyst dependent. The apparent activation energies have been determined to be 13.5 ± 1.8 and 14.7 ± 1.6 kJ mol⁻¹ for CA and TEA, respectively, indicating the existence of an activation energy barrier in a photocatalytic process which can be attributed to the desorption of adsorbed products.

Original language	English
Pages (from-to)	2687-2693
Number of pages	7
Journal	Environmental Technology (United Kingdom)
Volume	37
Issue number	21
DOIs	https://doi.org/10.1080/09593330.2016.1158871
State	Published - 1 Nov 2016
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 Informa UK Limited, trading as Taylor & Francis Group.

Keywords

Photocatalytic hydrogen production
biomass derivatives
citric acid
titanium dioxide
triethanolamine

ASJC Scopus subject areas

Environmental Chemistry
Water Science and Technology
Waste Management and Disposal

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1080/09593330.2016.1158871

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title = "Photocatalytic hydrogen production from biomass-derived compounds: a case study of citric acid",

abstract = "Highly crystalline anatase TiO2 nanoparticles with high BET surface area have been synthesized by thermal hydrolysis of titanium(IV) bis(ammoniumlactato) dihydroxide aqueous solutions. The photocatalytic H2 production from aqueous citric acid (CA) solutions over Pt-loaded TiO2 has been investigated under different experimental conditions, that is, different CA concentration, temperature, light intensity, and pH of Pt/TiO2 suspension. For comparison, the photocatalytic dehydrogenation of triethanolamine (TEA) has also been investigated. The highest H2 production rates were obtained at pH 3 and 9 for CA and TEA, respectively. This behavior is readily explained by the adsorption characteristic of the employed reagent on the surface of the charged TiO2. The effect of the photocatalyst loading and the light intensity on the H2 production rate showed the same behavior in the case of CA and TEA evincing that these parameters are catalyst dependent. The apparent activation energies have been determined to be 13.5 ± 1.8 and 14.7 ± 1.6 kJ mol−1 for CA and TEA, respectively, indicating the existence of an activation energy barrier in a photocatalytic process which can be attributed to the desorption of adsorbed products.",

keywords = "Photocatalytic hydrogen production, biomass derivatives, citric acid, titanium dioxide, triethanolamine",

author = "Alkaim, \{Ayad F.\} and Kandiel, \{Tarek A.\} and Ralf Dillert and Bahnemann, \{Detlef W.\}",

note = "Publisher Copyright: {\textcopyright} 2016 Informa UK Limited, trading as Taylor \& Francis Group.",

year = "2016",

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doi = "10.1080/09593330.2016.1158871",

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AU - Alkaim, Ayad F.

AU - Kandiel, Tarek A.

AU - Dillert, Ralf

AU - Bahnemann, Detlef W.

PY - 2016/11/1

Y1 - 2016/11/1

N2 - Highly crystalline anatase TiO2 nanoparticles with high BET surface area have been synthesized by thermal hydrolysis of titanium(IV) bis(ammoniumlactato) dihydroxide aqueous solutions. The photocatalytic H2 production from aqueous citric acid (CA) solutions over Pt-loaded TiO2 has been investigated under different experimental conditions, that is, different CA concentration, temperature, light intensity, and pH of Pt/TiO2 suspension. For comparison, the photocatalytic dehydrogenation of triethanolamine (TEA) has also been investigated. The highest H2 production rates were obtained at pH 3 and 9 for CA and TEA, respectively. This behavior is readily explained by the adsorption characteristic of the employed reagent on the surface of the charged TiO2. The effect of the photocatalyst loading and the light intensity on the H2 production rate showed the same behavior in the case of CA and TEA evincing that these parameters are catalyst dependent. The apparent activation energies have been determined to be 13.5 ± 1.8 and 14.7 ± 1.6 kJ mol−1 for CA and TEA, respectively, indicating the existence of an activation energy barrier in a photocatalytic process which can be attributed to the desorption of adsorbed products.

AB - Highly crystalline anatase TiO2 nanoparticles with high BET surface area have been synthesized by thermal hydrolysis of titanium(IV) bis(ammoniumlactato) dihydroxide aqueous solutions. The photocatalytic H2 production from aqueous citric acid (CA) solutions over Pt-loaded TiO2 has been investigated under different experimental conditions, that is, different CA concentration, temperature, light intensity, and pH of Pt/TiO2 suspension. For comparison, the photocatalytic dehydrogenation of triethanolamine (TEA) has also been investigated. The highest H2 production rates were obtained at pH 3 and 9 for CA and TEA, respectively. This behavior is readily explained by the adsorption characteristic of the employed reagent on the surface of the charged TiO2. The effect of the photocatalyst loading and the light intensity on the H2 production rate showed the same behavior in the case of CA and TEA evincing that these parameters are catalyst dependent. The apparent activation energies have been determined to be 13.5 ± 1.8 and 14.7 ± 1.6 kJ mol−1 for CA and TEA, respectively, indicating the existence of an activation energy barrier in a photocatalytic process which can be attributed to the desorption of adsorbed products.

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KW - biomass derivatives

KW - citric acid

KW - titanium dioxide

KW - triethanolamine

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ER -

Photocatalytic hydrogen production from biomass-derived compounds: a case study of citric acid

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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