A comparative study for the removal of mining wastewater by kaolinite, activated carbon and beta zeolite

Magriotis, Zuy M.; Leal, Paulo Vitor Brandão; Sales, Priscila Ferreira de; Papini, Rísia Magriotis; Viana, Paulo R.M.; Arroyo, Pedro Augusto

doi:10.1016/j.clay.2014.02.007

Cited by 31 publications

(19 citation statements)

References 24 publications

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“…It can be inferred that beta Lewis acid sites, whose formation has been The relationship between the solute amount adsorbed for per unit mass of adsorbent q and its concentration at equilibrium C e is provided by equilibrium adsorption isotherms. The Langmuir isotherm has been frequently used to describe the adsorption of organics in aqueous solutions onto hydrophobic zeolites [10,15,29]. This model considers a monolayer adsorption onto energetically equivalent adsorption sites and negligible sorbate-sorbate interactions.…”

Section: Adsorption From Aqueous Solutionsmentioning

confidence: 99%

“…This model has already been employed for adsorption on BEAs of several classes of organic compounds, such as pharmaceuticals [6], etheramine [29], xylene isomers and ethylbenzene [31]. Freundlich isotherm is a relationship describing non-ideal and reversible adsorption, not restricted to the formation of monolayer.…”

Section: Adsorption From Aqueous Solutionsmentioning

confidence: 99%

“…As an example, the uptake data obtained for TOL on Beta360 are shown in Figure 1. The data of Figure 1 were fitted by the pseudo-second order model (Equation (2)), which has been employed in many studies concerning the adsorption of organic compounds onto zeolites [28,29].…”

Section: Adsorption From Aqueous Solutionsmentioning

confidence: 99%

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Effect of Silica Alumina Ratio and Thermal Treatment of Beta Zeolites on the Adsorption of Toluene from Aqueous Solutions

et al. 2017

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Abstract:The adsorption of toluene from aqueous solutions onto hydrophobic zeolites was studied by combining chromatographic, thermal and structural techniques. Three beta zeolites (notated BEAs, since they belong to BEA framework type), with different SiO 2 /Al 2 O 3 ratios (i.e., 25, 38 and 360), before and after calcination, were tested as adsorbents of toluene from aqueous media. This was performed by measuring the adsorbed quantities of toluene onto zeolites in a wide concentration range of solute. The adsorption data were fitted with isotherms whose models are based on surface heterogeneity of the adsorbent, according to the defective structure of beta zeolites. The thermal treatment considerably increases the adsorption of toluene, in the low concentration range, on all BEAs, probably due to surface and structural modifications induced by calcination. Among the calcined BEAs, the most hydrophobic zeolite (i.e., that with SiO 2 /Al 2 O 3 ratio of 360) showed the highest binding constant, probably due to its high affinity for an organophilic solute such as toluene. The high sorption capacity was confirmed by thermogravimetric analyses on BEAs, before and after saturation with toluene.

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Section: Adsorption From Aqueous Solutionsmentioning

confidence: 99%

Section: Adsorption From Aqueous Solutionsmentioning

confidence: 99%

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Effect of Silica Alumina Ratio and Thermal Treatment of Beta Zeolites on the Adsorption of Toluene from Aqueous Solutions

et al. 2017

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“…A mineração é uma das principais atividades econômicas do Brasil, contribuindo de maneira sistêmica para o desenvolvimento tecnológico e a qualidade de vida. O principal recurso utilizado no setor de mineração é a água, especialmente na etapa de beneficiamento do minério, tornando de extrema importância o estudo de maneiras de uso sustentável e reaproveitamento desde recurso (Magriotis et al, 2014).…”

Section: Introductionunclassified

Cinética De Remoção De Eteramina Utilizando Biochar De Pirólise

Gândara¹,

Teófilo²,

Fernandes³

et al. 2018

Blucher Chemical Engineering Proceedings

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RESUMO -A eteramina, um reagente muito utilizado na flotação de minério de ferro, é corrosiva, nociva para os organismos aquáticos e apresenta elevado valor de demanda química de oxigênio (DQO). Desta forma, o objetivo neste trabalho foi avaliar a cinética de adsorção da eteramina utilizando biochar de pirólise. O biochar foi caracterizado por FTIR e potencial zeta. A cinética de adsorção foi avaliada para os modelos de pseudoprimeira, pseudossegunda ordem e difusão intrapartícula. A eficiência de remoção foi de aproximadamente 98%, sendo melhor ajustada ao modelo de pseudossegunda ordem.

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“…These effluents are usually treated by neutralization, precipitation and sedimentation (Akcil and Koldas, 2006;Correia, 2008;Langsch et al, 2012), although other technologies such as anaerobic bioreactors (Wildeman et al, 2006), sorption (Acheampong and Lens, 2014;Magriotis et al, 2014), coagulation and flocculation (Oncel et al, 2013;Yan et al, 2012), and crystallization (Fernández-Torres et al, 2012) may also be used. Nevertheless, these methods may: be insufficient to adjust effluent properties to meet discharge and/or reuse standards; require high consumption of chemical products; and generate large volumes of metal-contaminated sludge (Wang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration and Reverse Osmosis Applied to Gold Mining Effluent Treatment and Reuse

Andrade

Aguiar

Pires

et al. 2017

Braz. J. Chem. Eng.

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-Gold mining and ore processing are activities of great economic importance. However, they are related to generation of extremely polluted effluents containing high concentrations of heavy metals and low pH. This study aims to evaluate the optimal conditions for gold mining effluent treatment by crossflow membrane filtration regarding the following variables: nanofiltration (NF) and reverse osmosis (RO) membrane types, feed pH and permeate recovery rate. It was observed that retention efficiencies of NF90 were similar to those of RO membranes though permeate fluxes obtained were 7-fold higher. The optimum pH value was found to be 5.0, which resulted in higher permeate flux and lower fouling formation. At a recovery rate above 40% there was a significant decrease in permeate quality, so this was chosen as the maximum recovery rate for the proposed system. We conclude that NF is a suitable treatment for gold mining effluent at an estimated cost of US$ 0.83/m³.

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A comparative study for the removal of mining wastewater by kaolinite, activated carbon and beta zeolite

Cited by 31 publications

References 24 publications

Effect of Silica Alumina Ratio and Thermal Treatment of Beta Zeolites on the Adsorption of Toluene from Aqueous Solutions

Effect of Silica Alumina Ratio and Thermal Treatment of Beta Zeolites on the Adsorption of Toluene from Aqueous Solutions

Cinética De Remoção De Eteramina Utilizando Biochar De Pirólise

Nanofiltration and Reverse Osmosis Applied to Gold Mining Effluent Treatment and Reuse

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