Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Xavier, Katiane Cruz Magalhães; Santos, Maria do Socorro Ferreira dos; Santos, Marcos José Leite; Oliveira, Marília Evelyn Rodrigues; Carvalho, Maria W. N. C; Osajima, Josy A.; Filho, Edson Cavalcanti da Silva

doi:10.1590/s1516-14392014005000057

Cited by 43 publications

(25 citation statements)

References 22 publications

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“…However, some of the metallic oxides were reduced by HCl treatment, metallic oxides decreased by acid treatment include; Fe2O3, Al2O3, MnO, K2O, MgO and CaO. These results are similar to one found by Xavier et al, [8] while investigating the effect of acid treatment on clay palygorskite clay obtained from Guadalupe [8].…”

Section: *Values Are Means ± Sd (N=3)supporting

confidence: 86%

“…The results of acid treatment indicate that the chemical composition of the clays changed substantially. As the concentration of the acid increased, there was a marked increase in the dissolution of all soluble cations [8]. The acid treatment causes a reduction in the composition of most elements with a higher reduction being achieved at a higher concentration as shown in Table 1 above.…”

Section: *Values Are Means ± Sd (N=3)mentioning

confidence: 92%

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Effect of Acid Treatment on the Chemical Properties of Clays from Selected Sites in Murang’a and Nyeri counties, Kenya

2020

JNSR

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Assessing improvement on the quality of clay has been conducted by treatment with different concentrations of hydrochloric and oxalic acid. This project intended to assess the effect of acid treatment on the elemental composition of clays from selected sites. The clays were leached using hydrochloric and oxalic acid separately at a concentration of 0.0, 0.1, 0.25, 0.5, 1, and 2M. The elemental composition of raw and acid-treated clays was determined using AAS. Elemental composition of the acid-treated clays, in oxide form were in the ranges of 40.80-65.16 % SiO2, 7.16-30.33 % Al2O3, 0.33-7.62 %TiO2, 0.24-2.65 % K2O, 0.01-1.82 % MgO. The findings of this study showed that the quality of clays could be improved by acid treatment hence the clays can be used as a source of raw materials for industrial applications.

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Section: *Values Are Means ± Sd (N=3)supporting

confidence: 86%

Section: *Values Are Means ± Sd (N=3)mentioning

confidence: 92%

Effect of Acid Treatment on the Chemical Properties of Clays from Selected Sites in Murang’a and Nyeri counties, Kenya

2020

JNSR

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“…The PALY showed characteristic peak at 2h = 8.4°w hich is associated with the crystallographic plane (110) according to JCPDS-ICCD card 00-031-0783 [22,23], and the basal spacing calculated was 10.4 Å . The XRD patterns of the samples PALY-CTAB (Fig.…”

Section: Electrical Impedance Spectroscopymentioning

confidence: 99%

Preparation and characterization of composite polyaniline/poly(vinyl alcohol)/palygorskite

Oliveira

Santos

Silva

et al. 2014

J Therm Anal Calorim

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The preparation of composites occurred by insertion of organically modified molecules, using quaternary ammonium salts-Cetremide (cetyl trimethyl ammonium bromide, CTAB) and Genamim (cetyl trimethyl ammonium chloride, CTAC)-in the fibrous structure of the palygorskite clay (PALY). For the preparation of PANI/PVA (polyaniline/poly(vinyl alcohol), PANI/PVA/ PALY, PANI/PVA/PALY-CTAB, and PANI/PVA/PALY-CTAC films, the ''casting'' technique was used, and they were characterized by XRD, FTIR, SEM, TG/DTG, and DSC. The XRD and FTIR data suggest that there was the incorporation of characteristic groups of the ammonium salts was incorporated on the clay. The TG/DTG curves showed that the decomposition occurred with natural and organophilic PALY showing a thermal stability profile. The incorporation of PALY to the blend PANI/PVA affected the thermal profile, and the DSC curves of the PANI/PVA/PALY suggest that the incorporation of polymers in the PALY structure decreases the crystalline fraction of the material. Through electrical impedance spectroscopy with alternating current, we observed that the blend of composites PANI/PVA with clay PALY-CTAC is more conductive presenting electric conductivity at low frequencies around 6.0 9 10 -4 S cm -1 , whereas in the films with the clay PALY-CTAB conductivity reaches 1.4 9 10 -6 S cm -1 , that is approximately four times smaller. It was observed that films with clay and those that are doped become much more conductive than the electrical blend of PANI/PVA doped as well.

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“…Os valores de área superficial obtidos segundo método BETforam para a amostra AN 9,821 m²/g, para a amostra AM1 0,045 m²/g, para a amostra AM2 2,665 m²/g e para a amostra AM3 46,714 m²/g. O aumento da área superficial de argilas tratadas acidamente já foi observado em outros estudos e sugerese que esse aumento pode ser devido a eliminação dos cátions trocáveis do espaço interlamelar das argilas (Xavier et al, 2014).…”

Section: Determinação De áRea Superficial E Tamanho Médio De Porounclassified

Comparação Do Potencial De Adsorção De Rodamina B Por Argilas Natural E Modificada

Silva

Melo²,

Marques

et al. 2017

RBES

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Argila bentonita natural e após modificações superficiais, foram testadas como adsorventes do corante Rodamina B para fins de comparação de eficiência dos tratamentos na remoção do corante. As modificações realizadas na argila foram: organofilização em solução, feita através da intercalação do sal quaternário cloreto de cetil trimetil amônio, organofilização no estado sólido pela intercalação do sal cetil trimetil amônio e tratamento ácido, feito com ácido clorídrico. Soluções de corante na concentração de 10 mg/L para pH diferentes (3,4,9,12) foram feitas e posteriormente as agilas foram dispersas nessas soluções na concentração de 0,4 g/L, sendo o sistema mantido sob agitação manual. Alíquotas em diferentes tempos (10, 20 e 30 min) foram retiradas e levadas para análise de espectrofotometria no UV-Visível, onde pode-se avaliar a variação de corante nas soluções que estiveram em contato com as argilas. As argilas que tiveram contato com a argila ácida foram as que obtiveram melhor resultado de remoção de corante, exceto para o pH 12 onde a argila natural foi mais eficiente. As modificações com sais quaternários não tiveram bons resultados mostrando que não são metodologias adequadas para modificação de adsorventes do corante Rodamina B.

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Effects of acid treatment on the clay palygorskite: XRD, surface area, morphological and chemical composition

Cited by 43 publications

References 22 publications

Effect of Acid Treatment on the Chemical Properties of Clays from Selected Sites in Murang’a and Nyeri counties, Kenya

Effect of Acid Treatment on the Chemical Properties of Clays from Selected Sites in Murang’a and Nyeri counties, Kenya

Preparation and characterization of composite polyaniline/poly(vinyl alcohol)/palygorskite

Comparação Do Potencial De Adsorção De Rodamina B Por Argilas Natural E Modificada

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