New insights into the influence of activated carbon surface oxygen groups on H2O2 decomposition and oxidation of pre-adsorbed volatile organic compounds

被引：49

作者：

Anfruns, Alba ^{[1
]}

Garcia-Suarez, Eduardo J. ^{[2
]}

Montes-Moran, Miguel A. ^{[2
]}

Gonzalez-Olmos, Rafael ^{[1
]}

Martin, Maria J. ^{[1
]}

机构：

[1] Univ Girona, Inst Environm, LEQUIA, E-17071 Girona, Catalonia, Spain

[2] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain

来源：

CARBON | 2014年 / 77卷

关键词：

HYDROGEN-PEROXIDE; CATALYTIC DECOMPOSITION; AQUEOUS-SOLUTION; PART I; CHEMISTRY; WATER; 4-CHLOROPHENOL; CONTAMINANTS; ADSORPTION; OZONATION;

D O I：

10.1016/j.carbon.2014.05.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, the influence of the surface oxygen groups of activated carbons (ACs) on the decomposition of H2O2 and the consequent (OH)-O-center dot radicals generation is investigated. The oxidation of pre-adsorbed volatile organic compounds by H2O2 is also studied. Four ACs, with low percentage of inorganic matter (<0.2%), similar textural properties but differing in their surface oxygen content were evaluated. The surface oxygen groups of the ACs were characterised by using appropriate characterisation techniques (temperature programmed desorption and X-ray photoelectron spectroscopy). The kinetic curves of H2O2 decomposition were very similar for all the ACs. However, different profiles in the production of (OH)-O-center dot radicals were observed. (OH)-O-center dot radicals generation seemed to be promoted by low surface oxygen contents. Oxidation of two volatile organic compounds (VOCs) of different polarity, methyl ethyl ketone (MEK) and toluene, pre-adsorbed onto the ACs was finally investigated. H2O2 was used as oxidising agent. Both VOCs presented similar maximum oxidation rates, around 70%, in spite of their different hydrophobicity. Some evidences are provided supporting that oxidation of pre-adsorbed VOCs can take place in the inner pore structure of the ACs. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：89 / 98

页数：10

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