Palygorskite
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Preparation and performance of magnetic zirconium-iron oxide nanoparticles loaded on palygorskite in the adsorption of phosphate from water
Magnetic zirconium-iron oxide nanoparticles loaded on palygorskite as a low-cost adsorbent was produced by one-step co precipitation technique and its properties for phosphate adsorption were overall investigated. The Brunauer Emmett Teller (BET) specific surface area analysis, scanning electron microscopy (SEM), thermo gravimetric analysis (TGA), Fourier tr
Química Nova. Publicado em: 2022
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2. Purification of raw palygorskite: a comparative study involving different processes and dispersing agents
Abstract Palygorskite (Pal) is a natural clay mineral with fibrous morphology and high surface area. Depending on the geological origin, it presents impurities, such as quartz and carbonates, which can harm some of its properties. Therefore, this work seeks to define a viable methodology for the purification of a Brazilian Pal. Two types of mixing processes
Cerâmica. Publicado em: 2021-06
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3. Natural Palygorskite as an Industrial Dye Remover in Single and Binary Systems
Layered or fibrous clay minerals are used as adsorbents because they have good performance to remove inorganic and organic species. In this work, a Brazilian fibrous clay mineral was applied to remove Remazol Yellow GR industrial dye from simple and binary systems; this was performed in the presence of lead in the latter case. The adsorption efficiency was i
Mat. Res.. Publicado em: 10/10/2016
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4. Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition
The palygorskite is an aluminum-magnesium silicate that has a fibrous morphology. Their physico-chemical characteristics are the result of high surface area, porosity and thermal resistance which make it an attractive adsorbent. Its adsorption capacity can be increased through chemical reactions and/or heat treatments. The objective of this work is to verify
Mat. Res.. Publicado em: 09/05/2014
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5. The effect of natural and organophilic palygorskite on skin wound healing in rats
Devido ao crescente interesse da população pelos tratamentos naturais, as argilas representam uma boa alternativa para a aceleração da cicatrização durante o tratamento de feridas. Dentre as argilas, a paligorsquita, uma argila piauiense, devido à sua composição com silício e alumínio, demonstra certa aplicabilidade farmacêutica como agente cicat
Braz. J. Pharm. Sci.. Publicado em: 2013-12
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6. The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design
Palygorskite is fibrous clay in which the structural tetrahedral and octahedral layers are organized in a way that structural channels are formed, leading to high surface area. However, impurities inside the channels and aggregated ones considerably reduce the available area. In order to increase the surface area, an activation treatment can be considered us
Mat. Res.. Publicado em: 21/05/2013
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7. Paligorsquita como adsorvente para íons de metais de transição: Estudos cinéticos e do equilíbrio / Paligorsquite as adsorbent for transition metallic ion Kinetic and equilibrium study.
Os argilominerais são silicatos importantes do ponto de vista ambiental, tecnológico e acadêmico, existindo como materiais sintéticos ou naturais. Neste grupo se destaca a paligorsquita, que é um argilomineral de hábito fibroso de estrutura 2:1 de ampla aplicação industrial. Este mineral pode apresentar substituições isomórficas parciais do magné
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/12/2011
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8. Oxidação úmida de fenóis com catalisadores de ferro suportado em argilominerais em reator de leito de lama (slurry) / Phenol Wet oxidation on catalyst supported in clay minerals using a reactor with mechanical agitation (slurry)
A oxidação úmida de compostos orgânicos a CO2 e H2O tem demonstrado ser uma técnica interessante no tratamento de efluentes. Este trabalho tem como objetivo a síntese e caracterização dos catalisadores Fe-MnO2/CeO2, K-MnO2/CeO2/paligorsquita e Fe/paligorsquita, assim como, a avaliação na degradação oxidativa do fenol. Os experimentos foram realiz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/10/2010
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9. Argilas especiais: o que são, caracterização e propriedades
Special clays are a group of clays different from the large volume of clay mineral products named "Industrial Clays": kaolins, ball clays, refractory clays, bentonites, fuller's earths, common clays. Two groups of special clays exist: rare, as in the case of hectorite and sepiolite and restricted areas, as in the case of white bentonite, halloysite and palyg
Química Nova. Publicado em: 2007-02
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10. REMOÇÃO DE MANGANÊS II CONTIDO EM EFLUENTES LÍQUIDOS ATRAVÉS DA SORÇÃO EM PALIGORSQUITA E CINZAS DE CARVÃO / REMOVAL OF MANGANESE II FROM LIQUID EFFLUENTS THROUGH THE SORPTION ON PALYGORSKITE AND COAL ASH
In this work the removal of manganese II, of mining industry effluent was studied, by sorption, using two types of sorbent s: palygorskite ore and heavy coal ash (proceeding from coal burning of a thermo electrical plant ). A brief historical of metals sorption in clays and oxides was presented, besides the characteristics of sorption processes and the analy
Publicado em: 2005
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11. Determination of Total Acid in Palygorskite Chemically Modified by N-Butylamine Thermodesorption
The acid properties of palygorskite clay (R1) were studied using n-butylamine as probe molecule. A comparison was made of these properties in palygorskite clay (R1), in an acidified palygorskite (R2) and in acid palygorskite loaded with 2% of lanthanum (R3). The total acid properties were determined by FTIR (Fourier Transform Infrared) and TG-DTA (thermograv
Materials Research. Publicado em: 2002-06
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12. Experimental studies with palygorskite dusts.
As the preliminary results of experimental studies on dust from the palygorskite group have led to some confusion a detailed description of the completed investigation is given for clarification. As in other experiments the biological effects have been shown to be associated with the physical characteristics of the fibres in these specimens. Samples of sepio