Hybrid Inorganic/Organic Composites of Layered Double Hydroxides Intercalated with Organic Acid Anions for the Uptake of Hazardous Substances from Aqueous Solution-猫眼课题宝

DOI：

10.5772/17518

发表时间：

2011-07

期刊：

影响因子：

通讯作者：

中科院分区：

其他

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作者：

T. Kameda;T. Yoshioka

层状双氢氧化物（LDH）是一种具有层状结构的无机化合物，具有阴离子交换特性。其基本化学组成为 [M2+1−xM3+x(OH)2](An– )x/nmH2O，其中 x 是 M3+/(M2+ + M3+) 摩尔比，An– 表示化合价为 n 的阴离子（Ingram 和 Taylor，1967；Allmann，1968；Taylor，1973）。其晶体结构由带正电的水镁石状八面体氢氧化物层组成，M2+位点含有M3+，被层间阴离子电中和，而插层阴离子的水合壳中的水分子占据剩余的层间空间。在由不同 M2+ 和 M3+ 组成的各种类型的 LDH 中，Mg−Al LDH 已被实际用作抗酸剂和阻燃剂（Cavani 等人，1991）。嵌入 CO32− 的 Mg−Al LDH (CO3Mg−Al LDH) 可根据以下反应在 450–800 °C 下煅烧转化为 Mg−Al 氧化物：

Layered double hydroxide (LDH) is an inorganic compound with a layered structure and exhibits anion−exchange properties. Its basic chemical composition is [M2+1−xM3+x(OH)2](An– )x/nmH2O, where x is the M3+/(M2+ + M3+) molar ratio and An– indicates an anion with a valency of n (Ingram and Taylor, 1967; Allmann, 1968; Taylor, 1973). Its crystal structure consists of positively charged brucite-like octahedral hydroxide layers containing M3+ at M2+ sites, which are electrically neutralized by the interlayer anions, and water molecules in the hydration shell of the intercalated anions occupying the remaining interlayer space. Among various types of LDHs composed of different compositions of M2+ and M3+, Mg−Al LDH has been used practically as an antacid and a flame retardant (Cavani et al., 1991). Mg−Al LDH intercalated with CO32− (CO3Mg−Al LDH) can be transformed into Mg−Al oxide by calcination at 450–800 °C according to the following reaction:

Hybrid Inorganic/Organic Composites of Layered Double Hydroxides Intercalated with Organic Acid Anions for the Uptake of Hazardous Substances from Aqueous Solution

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