Biossorção de cobre utilizando-se o mesocarpo e o endocarpo da macadâmia natural e quimicamente tratados

Boas, Naiza V.; Casarin, Juliana; Caetano, Josiane; Gonçalves, Affonso Celso; Tarley, César Ricardo Teixeira; Dragunski, Douglas Cardoso

doi:10.1590/s1415-43662012001200014

Cited by 15 publications

(8 citation statements)

References 24 publications

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“…About the kinetics models, there is a reduction in the adsorptive capacity of dregs over time, is probably a better fit to the beginning of the process since it is characterized as physical adsorption. The adsorption of metals at alkaline conditions is generally low since certain chemical groups only deprotonate at low pH values, allowing the binding of metals on the adsorbent surface (Boas et al, 2012). Decreases in removal percentage at high adsorbent dosages may be related to the saturation of adsorption sites (Alshameri et al, 2014), which was also reported by Fidelis (2015).…”

Section: Discussionmentioning

confidence: 84%

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Schoeler

Afonso

Delucis

et al. 2021

Preprint

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Water bodies contaminated by heavy metals cause a series of severe environmental and health issues. Chromium compounds stand out as one of the main contaminants since they are widely used by several industries. The low efficiency of effluent treatment facilities and the expensive sanitation procedures needed to remove metals from the water lead to serious concerns about the water quality in Brazil. In this study, a rigid polyurethane foam incorporated with green liquor dregs waste was prepared by the free expansion method. The foam composite and its isolated phases were evaluated for removing Cr(III) from water. The isolated dregs removed 81.93% of the Cr(III), which yielded a removal capacity of 135.45 mg·g-1. Whereas, the foam composite displayed Cr(III) removal percentage and capacity of 36.15% and 58.50 mg·g-1, respectively. Results suggests that the hybrid material may be considered for selective removal and extraction of Cr(III) from contaminated water.

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Section: Discussionmentioning

confidence: 84%

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Schoeler

Afonso

Delucis

et al. 2021

Preprint

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“…The biosorbent was characterized by determining the point of zero charge (PZC) according to the methodology proposed by Boas et al (2012), analysis by scanning electron microscopy (SEM) and Fourier transform infrared spectrum (FTIR).…”

Section: Methodsmentioning

confidence: 99%

Use of sweet ‘Pêra’ peel as an adsorbent in the treatment of textile effluents

Nascimento

Vieira

Almeida

et al. 2019

Rev. bras. eng. agríc. ambient.

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The disposal of industrial wastewater into aquatic bodies without proper treatment can cause severe damage to the environment and human health. The objective of this study was to perform the drying of the sweet orange (Citrus sinensis L. Osbeck) peel cultivar Pêra and evaluate the viability of its use as biosorbent in the removal of a direct dye. Drying was carried out in an oven with air circulation at temperatures of 60 and 80 ºC. The mathematical models of Page, Henderson and Pabis, Logarithmic, Midilli and Two-term exponential were fitted to the moisture data as a function of time. The material was characterized by scanning electron microscopy, point of zero charge, and infrared spectroscopy. In the adsorption study, a complete 24 factorial design was used to analyze the influence of mass, initial concentration, solution pH and contact time on adsorbed quantity (qt) and removal percentage of the dye (R%). In the drying, the two-term exponential model fitted best to the experimental data. The characterization of the material indicated that the adsorbent has zero charge point of 3.5 and porous structure, and the infrared analysis indicated the presence of carboxylic and hydroxyl groups. In the adsorption, the adsorbed quantity of the dye increased under conditions of lower pH and biosorbent mass and higher initial concentration and contact time. The removal percentage of dye increases with higher biosorbent mass. The biosorbent used is a promising waste for the adsorption of the burgundy-16 dye.

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“…A presença de poros e rugosidades na superfície do resíduo proporciona uma boa capacidade de biossorção o que é corroborado por vários outros estudos. [28][29][30] Determinação do ponto de carga zero (pH PCZ ) O ponto de carga zero (pH PCZ ) para o pó do caroço de açaí foi estimado graficamente em torno de 5,45, valor aproximado foi obtido por Gonçalves Jr. 28…”

Section: Caracterização Morfológicaunclassified

Removal of Cu (II), Zn (II) and Ni (II) using açaí residue (Euterpe oleracea Mart.) as a biosorbent in aqueous solution

Lima¹,

Costa²,

Alves³

et al. 2020

Rev. Virtual Quim.

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Removal of Cu (II), Zn (II) and Ni (II) using açaí residue (Euterpe oleracea Mart.) as a biosorbent in aqueous solution Resumo Abstract: Removal of transition metal ions such as Cu(II), Zn(II) and Ni(II) from aqueous solutions was investigated using açaí residual biomass (Euterpe oleracea Mart.) as a biosorbent. The characterization of sample was performed by SEM/EDS image and point of zero charge (pH PCZ). The influence of pH, contact time and initial metal concentration was evaluated. The adsorption process was studied by the models of isotherms of Langmuir and Freundlich. The pseudo first and second order kinetic models were considered to interpret the experimental data. The maximum sorption capacity determined was 15.77, 24.69 and 3.30 mg g-1 , respectively for Cu(II), Zn(II) and Ni(II). The biosorption followed pseudo second order kinetic. The adsorption process of the Cu(II), Zn(II) and Ni(II) ions is favorable and spontaneous. A remoção de íons de metais de transição, como Cu(II), Zn(II) e Ni(II) em meio aquoso, foi investigado utilizando biomassa residual de açaí (Euterpe oleracea Mart.) como biossorvente. A caracterização da amostra foi efetuada por meio de análise de imagem MEV/EDS e pH PCZ. A influência do pH, do tempo de contato e da concentração inicial foram avaliadas. O processo de adsorção foi estudado pelos modelos de isotermas de Langmuir e Freundlich. Os modelos cinéticos de pseudo primeira ordem e pseudo segunda ordem foram considerados na interpretação dos dados experimentais. A capacidade máxima de adsorção determinada foi 15,77, 24,69 e 3,30 mg g-1 para os íons Cu(II), Zn(II) e Ni(II), respectivamente. A cinética de adsorção foi melhor descrita pelo modelo de pseudo segunda ordem. O processo de adsorção dos íons Cu(II), Zn(II) e Ni(II) é favorável e espontâneo.

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Biossorção de cobre utilizando-se o mesocarpo e o endocarpo da macadâmia natural e quimicamente tratados

Cited by 15 publications

References 24 publications

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

Use of sweet ‘Pêra’ peel as an adsorbent in the treatment of textile effluents

Removal of Cu (II), Zn (II) and Ni (II) using açaí residue (Euterpe oleracea Mart.) as a biosorbent in aqueous solution

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