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Acid-leached mixed vermiculites obtained by treatment with nitric acid
Two samples of pristine vermiculites (V and V*) were reacted with nitric acid under controlled conditions. Structural and textural studies were performed using chemical composition, X-ray diffraction (XRD), 29Si and 27Al NMR, adsorption/desorption gaseous nitrogen measurements, SEM and TEM. Acid-act...
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Published in: | Applied clay science 2015-02, Vol.104, p.286-294 |
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description | Two samples of pristine vermiculites (V and V*) were reacted with nitric acid under controlled conditions. Structural and textural studies were performed using chemical composition, X-ray diffraction (XRD), 29Si and 27Al NMR, adsorption/desorption gaseous nitrogen measurements, SEM and TEM. Acid-activation increased the specific surface area and porosity of the samples and led to partial leaching of iron, aluminum and magnesium from the octahedral sheets. Acid leaching of the two vermiculite samples with 3 and 4molL−1 HNO3 at 80°C for 4h nearly removed all the MgO, Al2O3 and Fe2O3, and left behind SiO2-containing residue. The elements were easily extracted from both samples and the dissolution rate decreased in the order Mg2+>Al3+>Fe3+. XRD showed the formation of products with low crystallinity for both vermiculites treated with high acid concentrations.
The reaction between the pristine vermiculite and acid nitric resulted in a discolored solid. [Display omitted]
•Two vermiculites leached with HNO3 resulted in solids with high surface areas.•Acid-activation decreased the crystallinity of the vermiculites.•The layered structures of solids were maintained after lixiviation.•The dissolution rate decreased in the order Mg2+>Al3+>Fe3+ for both vermiculites. |
doi_str_mv | 10.1016/j.clay.2014.12.008 |
format | article |
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The reaction between the pristine vermiculite and acid nitric resulted in a discolored solid. [Display omitted]
•Two vermiculites leached with HNO3 resulted in solids with high surface areas.•Acid-activation decreased the crystallinity of the vermiculites.•The layered structures of solids were maintained after lixiviation.•The dissolution rate decreased in the order Mg2+>Al3+>Fe3+ for both vermiculites.</description><identifier>ISSN: 0169-1317</identifier><identifier>EISSN: 1872-9053</identifier><identifier>DOI: 10.1016/j.clay.2014.12.008</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Acid leaching ; Aluminum ; Dissolution ; Leached-clay mineral ; Lixiviation ; Magnesium ; Nitric acid ; Silicon dioxide ; Specific surface ; Vermiculite</subject><ispartof>Applied clay science, 2015-02, Vol.104, p.286-294</ispartof><rights>2014 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c440t-ada546feab6ede772b81f08a8c8f05870547ad507d9bd1bb46be1c0c75a3f1cc3</citedby><cites>FETCH-LOGICAL-c440t-ada546feab6ede772b81f08a8c8f05870547ad507d9bd1bb46be1c0c75a3f1cc3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958</link.rule.ids></links><search><creatorcontrib>Santos, S.S.G.</creatorcontrib><creatorcontrib>Silva, H.R.M.</creatorcontrib><creatorcontrib>de Souza, A.G.</creatorcontrib><creatorcontrib>Alves, A.P.M.</creatorcontrib><creatorcontrib>da Silva Filho, E.C.</creatorcontrib><creatorcontrib>Fonseca, M.G.</creatorcontrib><title>Acid-leached mixed vermiculites obtained by treatment with nitric acid</title><title>Applied clay science</title><description>Two samples of pristine vermiculites (V and V*) were reacted with nitric acid under controlled conditions. Structural and textural studies were performed using chemical composition, X-ray diffraction (XRD), 29Si and 27Al NMR, adsorption/desorption gaseous nitrogen measurements, SEM and TEM. Acid-activation increased the specific surface area and porosity of the samples and led to partial leaching of iron, aluminum and magnesium from the octahedral sheets. Acid leaching of the two vermiculite samples with 3 and 4molL−1 HNO3 at 80°C for 4h nearly removed all the MgO, Al2O3 and Fe2O3, and left behind SiO2-containing residue. The elements were easily extracted from both samples and the dissolution rate decreased in the order Mg2+>Al3+>Fe3+. XRD showed the formation of products with low crystallinity for both vermiculites treated with high acid concentrations.
The reaction between the pristine vermiculite and acid nitric resulted in a discolored solid. [Display omitted]
•Two vermiculites leached with HNO3 resulted in solids with high surface areas.•Acid-activation decreased the crystallinity of the vermiculites.•The layered structures of solids were maintained after lixiviation.•The dissolution rate decreased in the order Mg2+>Al3+>Fe3+ for both vermiculites.</description><subject>Acid leaching</subject><subject>Aluminum</subject><subject>Dissolution</subject><subject>Leached-clay mineral</subject><subject>Lixiviation</subject><subject>Magnesium</subject><subject>Nitric acid</subject><subject>Silicon dioxide</subject><subject>Specific surface</subject><subject>Vermiculite</subject><issn>0169-1317</issn><issn>1872-9053</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLAzEUhYMoWKt_wNUs3cyYO69kwE0pVoWCG12HzM0dmjKPmqTV_ntT6trNPXA534FzGLsHngGH-nGbYa-PWc6hzCDPOJcXbAZS5GnDq-KSzaKpSaEAcc1uvN9yDrmsmhlbLdCatCeNGzLJYH_iPZAbLO57G8gnUxu0HeO3PSbBkQ4DjSH5tmGTjDY4i4mOCbfsqtO9p7s_nbPP1fPH8jVdv7-8LRfrFMuSh1QbXZV1R7qtyZAQeSuh41JLlB2vpOBVKbSpuDBNa6Bty7olQI6i0kUHiMWcPZxzd2762pMParAeqe_1SNPeKxAcYvm6lNGan63oJu8ddWrn7KDdUQFXp9HUVp1GU6fRFOQqchF6OkMUSxwsOeXR0ohkrCMMykz2P_wX3Q52kQ</recordid><startdate>20150201</startdate><enddate>20150201</enddate><creator>Santos, S.S.G.</creator><creator>Silva, H.R.M.</creator><creator>de Souza, A.G.</creator><creator>Alves, A.P.M.</creator><creator>da Silva Filho, E.C.</creator><creator>Fonseca, M.G.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QQ</scope><scope>7SR</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope></search><sort><creationdate>20150201</creationdate><title>Acid-leached mixed vermiculites obtained by treatment with nitric acid</title><author>Santos, S.S.G. ; Silva, H.R.M. ; de Souza, A.G. ; Alves, A.P.M. ; da Silva Filho, E.C. ; Fonseca, M.G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c440t-ada546feab6ede772b81f08a8c8f05870547ad507d9bd1bb46be1c0c75a3f1cc3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Acid leaching</topic><topic>Aluminum</topic><topic>Dissolution</topic><topic>Leached-clay mineral</topic><topic>Lixiviation</topic><topic>Magnesium</topic><topic>Nitric acid</topic><topic>Silicon dioxide</topic><topic>Specific surface</topic><topic>Vermiculite</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Santos, S.S.G.</creatorcontrib><creatorcontrib>Silva, H.R.M.</creatorcontrib><creatorcontrib>de Souza, A.G.</creatorcontrib><creatorcontrib>Alves, A.P.M.</creatorcontrib><creatorcontrib>da Silva Filho, E.C.</creatorcontrib><creatorcontrib>Fonseca, M.G.</creatorcontrib><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Applied clay science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Santos, S.S.G.</au><au>Silva, H.R.M.</au><au>de Souza, A.G.</au><au>Alves, A.P.M.</au><au>da Silva Filho, E.C.</au><au>Fonseca, M.G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Acid-leached mixed vermiculites obtained by treatment with nitric acid</atitle><jtitle>Applied clay science</jtitle><date>2015-02-01</date><risdate>2015</risdate><volume>104</volume><spage>286</spage><epage>294</epage><pages>286-294</pages><issn>0169-1317</issn><eissn>1872-9053</eissn><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><abstract>Two samples of pristine vermiculites (V and V*) were reacted with nitric acid under controlled conditions. Structural and textural studies were performed using chemical composition, X-ray diffraction (XRD), 29Si and 27Al NMR, adsorption/desorption gaseous nitrogen measurements, SEM and TEM. Acid-activation increased the specific surface area and porosity of the samples and led to partial leaching of iron, aluminum and magnesium from the octahedral sheets. Acid leaching of the two vermiculite samples with 3 and 4molL−1 HNO3 at 80°C for 4h nearly removed all the MgO, Al2O3 and Fe2O3, and left behind SiO2-containing residue. The elements were easily extracted from both samples and the dissolution rate decreased in the order Mg2+>Al3+>Fe3+. XRD showed the formation of products with low crystallinity for both vermiculites treated with high acid concentrations.
The reaction between the pristine vermiculite and acid nitric resulted in a discolored solid. [Display omitted]
•Two vermiculites leached with HNO3 resulted in solids with high surface areas.•Acid-activation decreased the crystallinity of the vermiculites.•The layered structures of solids were maintained after lixiviation.•The dissolution rate decreased in the order Mg2+>Al3+>Fe3+ for both vermiculites.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.clay.2014.12.008</doi><tpages>9</tpages></addata></record> |
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subjects | Acid leaching Aluminum Dissolution Leached-clay mineral Lixiviation Magnesium Nitric acid Silicon dioxide Specific surface Vermiculite |
title | Acid-leached mixed vermiculites obtained by treatment with nitric acid |
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