New method of treating dilute mineral acids using magnesium-aluminum oxide

被引：70
作者：
Kameda, T
Yabuuchi, F
Yoshioka, T
Uchida, M
Okuwaki, A
机构：
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Aoba Ku, Sendai, Miyagi 9808579, Japan
来源：
WATER RESEARCH | 2003年 / 37卷 / 07期
关键词：
hydrotalcite; Mg-Al oxide; dilute mineral acid; treatment; intercalation;
D O I：
10.1016/S0043-1354(02)00374-3
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Mineral acids, such as H3PO4, H2SO4, HCl, and HNO3, were treated with magnesium-aluminum oxide (Mg-Al oxide), which behaved as a neutralizer and fixative of anions. Anion removal increased with increasing Mg-Al oxide quantity, time, Mg/Al molar ratio, and initial acid concentration. Up to 95% removal of anions was achieved in 0.5 N acids using a stoichiometric quantity of Mg0.80Al0.20O1.10 for H3PO4, 1.75 stoichiometric quantities for H2SO4, or 2.5 stoichiometric quantities for HCl or HNO3 at 20degreesC over a period of 6 h. The final solutions were found to have a pH in the range of 8-12. Selectivity of acid removal was found to follow the following order: H3PO4 > H2SO4 > HCl > HNO3. The equivalent of acid removal per 1 g of Mg-Al oxide decreased as the Mg/Al molar ratio of Mg-Al oxide increased. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：1545 / 1550
页数：6
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