Catalytic ozonation of 2-isopropyl-3-methoxypyrazine in water by γ-AlOOH and γ-Al2O3: Comparison of removal efficiency and mechanism

被引：68

作者：

Qi, F. ^{[1
]}

Xu, B. ^{[2
]}

Chen, Z. ^{[3
]}

Feng, L. ^{[1
]}

Zhang, L. ^{[1
]}

Sun, D. ^{[1
]}

机构：

[1] Beijing Forestry Univ, Coll Environm Sci & Engn, Beijing Key Lab Source Control Technol Water Poll, Beijing 100083, Peoples R China

[2] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

[3] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2013年 / 219卷

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Catalytic ozonation; 2-lsopropy1-3-methoxypyrazine; gamma-AlOOH; gamma-Al2O3; ALUMINUM HYDROXYL OXIDES; DRINKING-WATER; AQUEOUS-SOLUTION; OXALIC-ACID; SURFACE-PROPERTIES; ODOR COMPOUNDS; DEGRADATION; OZONE; PHASES; 2-METHYLISOBORNEOL;

D O I：

10.1016/j.cej.2013.01.035

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Taste and odor (T&O) is a serious problem in drinking water. The T&O compound, 2-isopropyl-3-methoxypyrazine (IPMP), generates an earthy-musty odor in water. In this study, catalytic ozonation by gamma-AlOOH (HAO) or gamma-Al2O3 (RAO) was used as an effective method for removing IPMP in water. The comparative removal performance and reaction mechanism of IPMP in catalytic ozonation with different aluminum oxides was investigated. The removal of IPMP in neutral water pH by catalytic ozonation in the presence of HAO or RAO was 94.2% and 90.0%, respectively. Both HAO and RAO exhibited the good stability and a low leaching of aluminum ions. The effect of water pH and typical anion experiments indicated that surface hydroxyl group was key reaction sites for HAO but not for RAO. From results of tert-butyl alcohol inhibition, R-ct values and ozone consumption efficiency in catalytic ozonation, center dot OH was generated in the solution in HAO catalytic ozonation or around the surface of catalyst in RAO reaction. The roles of oxidants, including ozone molecules and center dot OH, were analyzed quantitatively, confirming that the surface hydroxyl group was key site for ozone decomposition to generate center dot OH in solution in HAO catalytic ozonation. Ozone was adsorbed physically on the surface and concentrated ozone played an important role in IPMP removal in RAO catalytic ozonation. The nitrogen-containing IPMP intermediates generated in catalytic ozonation were determined quantitatively and qualitatively. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：527 / 536

页数：10

共 48 条

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