Preparation of consolidated zeolite body using mechanochemical phenomena and its application to removal of heavy metals

利用力化学现象制备固结沸石体及其在去除重金属中的应用

基本信息

批准号：
16550168
负责人：
SHIONO Takeshi
金额：
$ 1.98万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

Inorganic consolidated bodies were synthesized from water-glass (potassium or sodium silicate solution) and aluminum hydroxide. The possibility of transition of the consolidated body to bulky zeolite body was investigated. Mechanochemical effect of aluminum hydroxide on formation zeolite phase was also investigated. The removal capability of the synthesized bulky zeolite was estimated.For system of zeolite composed of potassium, zeolite F was synthesized when the precursor was heat-treated at a temperature higher than 140℃. The formation temperature was dependent on the amount of potassium. Addition of potassium remarkably decreased the formation temperature zeolite. For composition of K:Al:Si=1:1:1 in starting materials, for example, heat-treatment temperature higher than 140℃ was required to form zeolite phase. For composition of K:Al:Si=1.5:1:1 and K:Al:Si=2:1:1, on the contrary, the temperature decreased to 80℃ and 60℃, respectively. All of synthesized zeolites with different chemical composition were identified as type F. Excessive addition of potassium deteriorated the water resistance of the consolidated zeolite and the zeolite broke down in water.For system of zeolite composed of sodium, on the contrary, monolithic zeolite A (Na:Al:Si=1:1:1) could be synthesized as a consolidated body. Crystalline phase was greatly dependent on particle size of aluminum hydroxide as a starting material without mechanochemical treatment. For larger particle, faujasite type zeolite was synthesized and smaller particle promoted to form A type zeolite. In addition, mechanochemical treatment was very effective to synthesize monolithic zeolite A. The mechanochemical treatment had much effect on formation temperature of zeolite A. Aluminum hydroxide powder treated mechanically made the heat-treatment temperature of 60℃ enough to form bulky zeolite A.Both of zeolites, type F and type A, exhibited good characteristic of removal for heavy metals such as Pb and Cd.

通过水玻璃（钾或硅钠溶液）和氢氧化铝合成无机合并体。研究了合并体向笨重的沸石体过渡的可能性。还研究了氢氧化铝对地层沸石相的机械化学作用。估计合成的大沸石的去除能力。对于由钾组成的沸石系统，当在高于140℃的温度下对前体进行热处理时，合成了沸石F。形成温度取决于钾的量。钾的附加量显着降低了地层温度沸石。例如，在起始材料中，K：Al：Si = 1：1：1的组成，形成沸石相需要高于140℃的热处理温度。对于K：Al：Si = 1.5：1：1和K：Al：Si = 2：1：1的组成，在对比度上，温度分别降至80℃和60℃。 All of synthesized zeolites with different chemical composition were identified as type F. Excessive addition of potassium determined the water resistance of the consolidated zeolite and the zeolite broken down in water.For system of zeolite composed of sodium, on the contrast, monolithic zeolite A (Na:Al:Si=1:1:1) could be synthesized as a consolidated body.晶相非常依赖于氢氧化铝的粒径是无需机械处理的起始材料。对于较大的粒子，合成了氟加的沸石，并促进较小的粒子形成一种类型的沸石。 In addition, mechanochemical treatment was very effective to synthesize monolithic zeolite A. The mechanochemical treatment had much effect on formation temperature of zeolite A. Aluminum hydroxide powder treated mechanically made the heat-treatment temperature of 60℃ enough to form bulky zeolite A.Both of zeolites, type F and type A, exposed good characteristic of removal for heavy metals such as Pb and Cd.