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Organic templated nanometal oxyhydroxide

An oxyhydroxide and nano-metal technology, applied in the field of nano-materials, can solve the problems of decomposition of chitosan, reduction of fluoride intake capacity, clogging of filter devices, etc.

Inactive Publication Date: 2013-06-26
INDIAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removal of fluoride by Ti-Al supported chitosan beads has recently been examined where it was found that chitosan beads dried at 80 °C swelled in water and clogged the filter device
Sintering these beads at elevated temperature (eg, 450 °C) can improve the stability of the beads; however, the sintering process reduces the fluoride uptake capacity and may decompose chitosan
These constraints limit the use of this class of media for water purification applications

Method used

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Examples

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Embodiment 1

[0077]This example describes the low-temperature synthesis of nanoscale-AlOOH via a simple and mild chemical route. This synthesis method involves mixing an aluminum precursor solution with chitosan (dissolved in 1-5% glacial acetic acid or HCl or a combination thereof) with vigorous stirring. In a general method, a solution of an aluminum precursor such as aluminum nitrate is slowly added to a chitosan solution with vigorous stirring for 60 minutes and left overnight without stirring. Ammonia or NaOH solution was slowly added to the metal-chitosan solution with vigorous stirring to promote the precipitation of the metal-chitosan composite material (pH7-8.0). All these steps are carried out at a temperature below 30°C. Stirring was continued for 2 hours. The precipitate was filtered, washed to remove any unwanted impurities, converted to bead shape and dried under various conditions.

Embodiment 2

[0079] This example describes the preparation of OTBN using other biopolymers via a simple and mild chemical route. This synthesis method involves mixing an aluminum precursor solution with cellulose with vigorous stirring. In a general procedure, a solution of an aluminum precursor such as aluminum nitrate is slowly added to a polymer solution with vigorous stirring for 60 minutes and left overnight without stirring. Ammonia or NaOH solution was slowly added to the metal-cellulose solution with vigorous stirring to facilitate the precipitation of the metal-cellulose composite (pH 7-8.0). All these steps are carried out at a temperature below 30°C. Stirring was continued for 2 hours. The precipitate was filtered, washed to remove any unwanted impurities, converted to bead shape and dried under various conditions.

Embodiment 3

[0081] This example describes the preparation of OTBN by a simple and mild chemical route using a mixture of biopolymers. The biopolymers used in this study were chitosan and cellulose. Cellulose powder was added to the chitosan solution (chitosan dissolved in 1% acetic acid). The weight ratio of chitosan to cellulose is 1:1. Additionally, the aluminum nitrate solution was slowly added to the biopolymer solution with vigorous stirring for 60 minutes and left overnight without stirring. Ammonia or NaOH solution was slowly added to the metal-chitosan solution with vigorous stirring to promote the precipitation of the metal-cellulose-chitosan composite material (pH7-8.0). All these steps are carried out at a temperature below 30°C. Stirring was continued for 2 hours. The precipitate was filtered, washed to remove any unwanted impurities, converted to bead shape and dried under various conditions.

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Abstract

Disclosed are granular composites comprising a biopolymer and one or more nanometal- oxyhydroxide / hydroxide / oxide particles, along with methods for the preparation and use thereof.

Description

[0001] background technical field [0002] The present disclosure relates to nanomaterials, and in particular to nanometal oxyhydroxide materials, eg, organic template nanometal oxyhydroxide materials, and methods of making such materials. technical background [0003] Among all aluminum-based compositions, activated alumina is the most popular composition. Activated alumina is generally prepared by complete thermal dehydration of aluminum hydroxide, while boehmite is generally prepared by partial thermal dehydration of aluminum hydroxide. Activated alumina is an effective industrial desiccant, catalyst carrier and effective absorbent for arsenic and fluoride in water. The United Nations Environment Program (UNEP) classifies activated alumina absorption as the best available technology for removing arsenic from water. Aluminum-based compounds in general and aluminum oxide in particular are widely used and are the basis of demonstrated technologies for the removal of arseni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/20A61K33/24
CPCB01J21/04B01J23/745B01J31/06B01J37/035B01J37/36B82Y30/00C01B13/36C01F7/34C01P2002/72C01P2002/82C01P2002/85C01P2004/04C01P2004/64B01J20/06B01J20/08B01J20/24B01J20/28007B01J2220/46C02F1/281C02F1/286C02F2101/103C02F2101/14C02F2303/04C02F2305/08Y10T428/2982C02F1/288Y02P20/133B01J35/23
Inventor T·普拉迪普M·M·希哈布迪恩安什普M·U·桑卡尔C·阿姆瑞塔
Owner INDIAN INST OF TECH
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