Aplicação de Al-PILC na adsorção de Cu2+, Ni2+e Co2+ utilizando modelos físico-químicos de adsorção

Guerra, Denis de Jesus Lima; Airoldi, Cláudio; Lemos, Vanda Porpino; Angélica, Rômulo Simões; Viana, Rúbia Ribeiro

doi:10.1590/s0100-46702007000300008

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…Table V shows the BET specific surface area (S BET ) values obtained. These values, 128.5 and 112.6 m 2 /g, were higher than those found for some other natural Brazilian clays [63][64][65]. A "good" smectite clay acidactivated used as a bleaching agent should have a specific surface area in the range of 120-140 m 2 .g -1 [66].…”

Section: [Tabela I -Resultados Da Análise Granulométrica Das Amostrasmentioning

confidence: 78%

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

2017

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Characterization studies of clays are often performed to identify possible markets for these materials. Bearing this in mind, two samples of natural clays from the Southeast region of Brazil were studied. Conventional techniques of characterization were used. Granulometric analysis and determination of cationic exchange capacity of these clays were also performed. Nitrogen adsorptiondesorption measurements were used to determine the Brunauer-Emmett-Teller specific surface area, and Barrett-Joyner-Halenda and t-plot pore size analysis were carried out. The results obtained were similar for the two clays. Both present high clay fraction (above 80 wt%) composed of illite, kaolinite and quartz minerals. Stratified illite-smectite structures were also observed. Traces of calcite were detected in one of the clay samples, while traces of montmorillonite were observed in the other sample. These results were corroborated by the low cationic exchange capacity values obtained for both clays. These clays showed good adsorptive properties, evidenced by their specific surface areas, with predominantly mesoporous structures and slit-like pores. According to their features, these clays have potential use as adsorbents to replace more expensive materials due to their easy availability and low cost. Keywords: characterization techniques, clay minerals, natural clays. Resumo

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Section: [Tabela I -Resultados Da Análise Granulométrica Das Amostrasmentioning

confidence: 78%

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

2017

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“…Quando o argilomineral entra em contato com a H2O, facilita que cátions orgânicos ou inorgânicos infiltrem entre as partículas e lamelas, desse modo os cátions saem e entram em reações de troca catiônica sem destruição da estrutura cristalina do mineral (Guerra et al,2007…”

Section: Capacidade De Troca Catiônica -(Ctc)unclassified

Fundamentos Da Sorção De Neodímio Em Palygorskita: Aspectos Termodinâmicos E Cinéticos

NASCIMENTO¹

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In recent decades, the rare-earth elements (REEs) demand has considerably grown because of its strategic importance. REEs are widely used in different hightech sectors such as nuclear power, metallurgy, medicine, chemical engineering, electronics and computer manufacturing. Among REEs, is Neodymium, which is one of the most valuable metals used in alloys, electronic components and optical filters. The need for the high purity of these species requires selective separation, between the available methods, adsorption has earned greater attention due to its simplicity, high efficiency and low cost. The removal of metal ions is a complex task due to the high cost of treatment methods. Contributed to the intensification of research for low-cost adsorbent materials, reusable alternatives were added to the adsorption process. In this work was evaluated the clay mineral palygorskite as a sorbent potential for Nd (III) removal from aqueous solutions by batch trials. For this purpose, the sample from Guadalupe (Piauí) was benefited and the composition of the chemical and mineralogical was studied in order to use the sample with the highest purity in the adsorptive process. The samples were found to be essentially composed of palygorskite, kaolinite, quartz and diaspore. The chemical composition presents oxide contents, the main ones being SiO2, Al2O3 and MgO, corroborating the presence of palygorskite in the sample. Zeta Potential studies point out that the clay mineral has a negative surface charge in the whole pH range, in addition, the high surface area of 118.43 m 2 /g justifies the cation adsorber application. Different types of adsorption isotherms and kinetics models were used to describe the behavior of Nd (III) in adsorption and the best experimental results set refer to the Langmuir model and pseudo second order model, respectively, with the maximum uptake capacity was 15.39 mg/L evaluated at pH 5. Adsorption was found as an endothermic and spontaneous process (ΔH = 17.12 KJ/mol; ΔG =-26.3 KJ/mol) in relation to thermodynamic parameters obtained. Overall results suggest that this adsorbent has been shown to be a potential sorbent for enrichment and separation of Nd (III) from aqueous solutions.

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Synthesis, Characterization and Application of ZrCl4-Graphene Composite Supported on Activated Carbon for Efficient Removal of Fluoride to Obtain Drinking Water

Marin

Módenes²,

Bergamasco

et al. 2016

Water Air Soil Pollut

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Aplicação de Al-PILC na adsorção de Cu2+, Ni2+e Co2+ utilizando modelos físico-químicos de adsorção

Cited by 5 publications

References 37 publications

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

Mineralogical characterization of natural clays from Brazilian Southeast region for industrial applications

Fundamentos Da Sorção De Neodímio Em Palygorskita: Aspectos Termodinâmicos E Cinéticos

Synthesis, Characterization and Application of ZrCl4-Graphene Composite Supported on Activated Carbon for Efficient Removal of Fluoride to Obtain Drinking Water

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