Immobilization of Aqueous Heavy Metals with Non-apatites-type Apatites

非磷灰石型磷灰石固定水相重金属

基本信息

批准号：
14550801
负责人：
SUGIYAMA Shigeru
金额：
$ 0.9万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550801/
关键词：
Apatite Phosphates Aqueous Heavy Metals Recovery Immobilization 重金属回収水質浄化回収体再利用

项目摘要

The summary was described as followed the projects planes submitted. Re.Plane 1 on 2002 : Based on the dissolution precipitation mechanism, it was found that calcium phosphate and calcium hydrogen phosphates could immobilize aqueous heavy metals. Particularly calcium monohydrogen phosphate could immobilize various heavy metals. Re. Plane 2 on 2003 : Magnesium and calcium sulfates revealed the. great removabilities of aqueous lead, indicating that those sulfates could be employed as a immobilization reagent from waste solutions in car-batteries. Re.Plane 1 on 2003 : Sodium and than potassium hydrogen phosphates, which are cheap and possess greater solubilities phosphates ever employed, were supplied as the immobilization reagents. Those alkali hydrogen phosphates afforded the excellent removabilities within 30 mm, indicating that the nature of the immobilization abilities is not unique for calcium hydroxyapatite but common properties for various phosphates. Re.Plane 2 on 2003 : Aqueous phosphate and ammonia, could be favorablely immobilized with magnesia and magnesium chloride to afford magnesium aluminum phosphate (MAP), which can be used as a slow-acting fertilizer. Particularly the adjustment of pH during the immobilization was found to be important to proceed smoothly for the immobilization. Solid state 31P MAS NMR showed that it was rather difficult to obtain high pure MAP although XRD afforded signals only due to MAP. Re.Plane 3 on 2003 : It has been already known that the solids recovered from the immobilization of aqueous heavy metals with various phosphates cannot be identified by XRD due to low crystalline. However the solid recovered from the immobilization of copper (II) ion with potassium hydrogen phosphate could be identified as Cu(P04)(OH)2 by the combination of XRD and solid state 31P MAS NMR.

概要描述如下：提交的项目平面。 2002年Re.Plane 1：基于溶解沉淀机理，发现磷酸钙和磷酸氢钙可以固定水中的重金属。特别是磷酸一氢钙可以固定多种重金属。关于。 2003 年的飞机 2：揭示了硫酸镁和硫酸钙。铅水溶液的去除能力很强，表明这些硫酸盐可以用作汽车电池废液中的固定试剂。 Re.Plane 1 on 2003：提供磷酸氢钠和磷酸氢钾作为固定化试剂，它们价格便宜并且比以往使用的磷酸盐具有更大的溶解度。这些碱金属磷酸氢盐在 30 mm 内具有优异的可去除性，这表明固定能力的性质并非羟基磷灰石钙所独有，而是各种磷酸盐的共同特性。 Re.Plane 2 on 2003 ：磷酸盐水溶液和氨可以很好地与氧化镁和氯化镁固定化，得到磷酸铝镁（MAP），它可以用作慢效肥料。特别是发现固定化过程中pH的调节对于固定化的顺利进行很重要。固态31P MAS NMR表明获得高纯MAP相当困难，尽管XRD仅因MAP而提供信号。 Re.Plane 3 on 2003 ：众所周知，从用各种磷酸盐固定水性重金属中回收的固体由于结晶度低而无法通过 XRD 鉴定。然而，通过结合XRD和固态31P MAS NMR，可以将从用磷酸氢钾固定铜(II)离子而回收的固体鉴定为Cu(PO 4 )(OH) 2 。