纳米结构材料Mn-Al LDH的制备及其插层反应

S. Hamouda, Salima Bouteraa, M. Sellami, N. Bettahar
{"title":"纳米结构材料Mn-Al LDH的制备及其插层反应","authors":"S. Hamouda, Salima Bouteraa, M. Sellami, N. Bettahar","doi":"10.1109/NAWDMPV.2014.6997598","DOIUrl":null,"url":null,"abstract":"Hydrotalcite (HT) or hydrotalcite-like compounds (HTlc) are layered double hydroxides belonging to the class of anionic clays. The structure of these compounds are very similar to that of brucite, Mg(OH)2, where some of Mg2+ represented as [M(II)] are isomorphously replaced by Al3+ represented as [M(III)] and the net positive charge is compensated by the inter-layered exchangeable anion (An-). LDH has been receiving increasing attention in recent years, owing to its potential technological applications such as catalysis, electrode, optical memory, separator, adsorbent, precursor for composite materials, and ion exchange. The general formula of these compounds can be represented as: [M(II)1-xM(III)x(OH)2]·Anx/n·mH2O with M(II) and M(III) as metal cations and An- as exchangeable anion. LDHs also possess relatively large surface areas and high anion-exchange capacities. Because of these properties, LDHs have been studied for removing toxic anionic species from aqueous systems. Thermal decomposition of these materials by calcination above 420°C results in the formation of high surface area basic mixed oxides which are reported to be potential candidates in catalyzing various reactions involved in the synthesis of a variety of fine chemicals. Indeed at this temperature, the as formed mixed oxides solid solution can regenerate upon rehydratation the HT structure with the suitable anions present in solution. Therefore, this so-called reconstruction process may be used to improve the sorption of anionic species. The LDH has been synthesized by the coprecipitation method at pH constant. The material has been obtained with [Mn/Al] molar ratio of 2.0. The product is characterized by X-ray diffraction (XRD), spectroscopy infra red (FTIR), and differential thermal analysis / thermo gravimetric analysis (DTA/TG). Dosages of polluted solutions have been realized by spectrometry UV visible.","PeriodicalId":149945,"journal":{"name":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2014-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":"{\"title\":\"Preparation and intercalation reactions of nano-structural materials, Mn-Al LDH\",\"authors\":\"S. Hamouda, Salima Bouteraa, M. Sellami, N. Bettahar\",\"doi\":\"10.1109/NAWDMPV.2014.6997598\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Hydrotalcite (HT) or hydrotalcite-like compounds (HTlc) are layered double hydroxides belonging to the class of anionic clays. The structure of these compounds are very similar to that of brucite, Mg(OH)2, where some of Mg2+ represented as [M(II)] are isomorphously replaced by Al3+ represented as [M(III)] and the net positive charge is compensated by the inter-layered exchangeable anion (An-). LDH has been receiving increasing attention in recent years, owing to its potential technological applications such as catalysis, electrode, optical memory, separator, adsorbent, precursor for composite materials, and ion exchange. The general formula of these compounds can be represented as: [M(II)1-xM(III)x(OH)2]·Anx/n·mH2O with M(II) and M(III) as metal cations and An- as exchangeable anion. LDHs also possess relatively large surface areas and high anion-exchange capacities. Because of these properties, LDHs have been studied for removing toxic anionic species from aqueous systems. Thermal decomposition of these materials by calcination above 420°C results in the formation of high surface area basic mixed oxides which are reported to be potential candidates in catalyzing various reactions involved in the synthesis of a variety of fine chemicals. Indeed at this temperature, the as formed mixed oxides solid solution can regenerate upon rehydratation the HT structure with the suitable anions present in solution. Therefore, this so-called reconstruction process may be used to improve the sorption of anionic species. The LDH has been synthesized by the coprecipitation method at pH constant. The material has been obtained with [Mn/Al] molar ratio of 2.0. The product is characterized by X-ray diffraction (XRD), spectroscopy infra red (FTIR), and differential thermal analysis / thermo gravimetric analysis (DTA/TG). Dosages of polluted solutions have been realized by spectrometry UV visible.\",\"PeriodicalId\":149945,\"journal\":{\"name\":\"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2014-12-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/NAWDMPV.2014.6997598\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"2014 North African Workshop on Dielectic Materials for Photovoltaic Systems (NAWDMPV)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/NAWDMPV.2014.6997598","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4

摘要

水滑石(HT)或类水滑石化合物(HTlc)是属于阴离子粘土类的层状双氢氧化物。这些化合物的结构与水镁石Mg(OH)2非常相似,其中一些Mg2+(表示为[M(II)])被Al3+(表示为[M(III)])同构取代,净正电荷被层间可交换阴离子(An-)补偿。LDH由于其在催化、电极、光存储、分离器、吸附剂、复合材料前驱体、离子交换等方面的潜在技术应用,近年来受到越来越多的关注。这些化合物的通式可表示为:[M(II)1-xM(III)x(OH)2]·Anx/n·mH2O,其中M(II)和M(III)为金属阳离子,An-为可交换阴离子。LDHs还具有相对较大的表面积和较高的阴离子交换能力。由于这些性质,LDHs已被研究用于从水系统中去除有毒阴离子。这些材料在420°C以上煅烧的热分解会形成高表面积的碱性混合氧化物,据报道,这些氧化物是催化各种精细化学品合成中涉及的各种反应的潜在候选者。事实上,在这个温度下,当溶液中存在合适的阴离子时,形成的混合氧化物固溶体可以在再水合后再生HT结构。因此,这种所谓的重建过程可用于改善阴离子的吸附。在pH恒定条件下,采用共沉淀法合成了LDH。得到了[Mn/Al]摩尔比为2.0的材料。通过x射线衍射(XRD)、红外光谱(FTIR)和差热分析/热重分析(DTA/TG)对产物进行了表征。用紫外可见光谱法测定了污染溶液的剂量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation and intercalation reactions of nano-structural materials, Mn-Al LDH
Hydrotalcite (HT) or hydrotalcite-like compounds (HTlc) are layered double hydroxides belonging to the class of anionic clays. The structure of these compounds are very similar to that of brucite, Mg(OH)2, where some of Mg2+ represented as [M(II)] are isomorphously replaced by Al3+ represented as [M(III)] and the net positive charge is compensated by the inter-layered exchangeable anion (An-). LDH has been receiving increasing attention in recent years, owing to its potential technological applications such as catalysis, electrode, optical memory, separator, adsorbent, precursor for composite materials, and ion exchange. The general formula of these compounds can be represented as: [M(II)1-xM(III)x(OH)2]·Anx/n·mH2O with M(II) and M(III) as metal cations and An- as exchangeable anion. LDHs also possess relatively large surface areas and high anion-exchange capacities. Because of these properties, LDHs have been studied for removing toxic anionic species from aqueous systems. Thermal decomposition of these materials by calcination above 420°C results in the formation of high surface area basic mixed oxides which are reported to be potential candidates in catalyzing various reactions involved in the synthesis of a variety of fine chemicals. Indeed at this temperature, the as formed mixed oxides solid solution can regenerate upon rehydratation the HT structure with the suitable anions present in solution. Therefore, this so-called reconstruction process may be used to improve the sorption of anionic species. The LDH has been synthesized by the coprecipitation method at pH constant. The material has been obtained with [Mn/Al] molar ratio of 2.0. The product is characterized by X-ray diffraction (XRD), spectroscopy infra red (FTIR), and differential thermal analysis / thermo gravimetric analysis (DTA/TG). Dosages of polluted solutions have been realized by spectrometry UV visible.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信