Thermodynamic properties and adsorption behaviour of hydrogel nanocomposites for cadmium removal from mine effluents

Fosso‐Kankeu, Elvis; Mittal, Hemant; Waanders, F.B.; Ray, Suprakas Sinha

doi:10.1016/j.jiec.2016.12.033

Cited by 127 publications

(46 citation statements)

References 48 publications

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“…At low pH, the high concentration of protons creates a competition in cation exchange behavior of MHA and decreases interactions of Cu (II) ions and binding sites of the adsorbent, leading to an undesirable metal uptake (Fosso-Kankeu, Mittal, Waanders, & Ray, 2017). At neutral pH, the adsorbing species might adhere to the surface of the adsorbents through either the hydrogen bonding or the ion exchange (Equation 5), which are known as the basic adsorption mechanisms (Shukla et al, 2002;Wang, Xiong, Wang, & Zhang, 2017):…”

Section: Effect Of Phmentioning

confidence: 99%

Efficient copper removal from wastewater through montmorillonite‐supported hydrogel adsorbent

Vesali‐Naseh

Barati

Naseh

2019

Water Environment Research

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A hybrid hydrogel based on acrylic acid monomer/wheat bran, supported by montmorillonite, was synthesized using in situ polymerization and utilized as an adsorbent to remove Cu (II) ions from an aqueous solution at batch condition. The structural and morphological microanalysis of adsorbents was carried out by scanning electron microscopy, Fourier transform infrared spectroscopy, and X‐ray powder diffraction techniques. The type of water diffusion into the adsorbents was Fickian, and the swelling process has followed Schott's second‐order kinetic model. The optimum adsorption conditions were the initial Cu (II) concentration 100 mg/l, pH 7.0, and montmorillonite dosage of 3.0 wt.%. The equilibrium time for the process was determined as 2 hr. The equilibrium data showed close fitting to the linear form of Langmuir isotherm model. Moreover, the maximum adsorption capacity has been determined to be 17.64 mg/g. Hence, montmorillonite‐supported hydrogel adsorbent seems to be a promising adsorbent for the copper removal from industrial wastewaters. Practitioner points A hydrogel adsorbent based on acrylic acid monomer/wheat bran, supported by montmorillonite was synthesized. The adsorbent was efficiently utilized for copper removal from aqueous solutions. The maximum adsorption capacity has been determined to be 17.64 mg/g.

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Section: Effect Of Phmentioning

confidence: 99%

Efficient copper removal from wastewater through montmorillonite‐supported hydrogel adsorbent

Vesali‐Naseh

Barati

Naseh

2019

Water Environment Research

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“…Ainda, a quitosana tem sido estudada como adsorvente para remoção de amônia em efluentes de aquicultura, alcançando eficiências de remoção de 100% (Bernardi et al, 2018). Também, tem-se estudos que relatam o uso de materiais adsorventes no tratamento de diversos efluentes como: tratamento de efluentes têxteis com musgo de turfa (Hemmati et al, 2016) e resíduos sólidos de processos da indústria siderúrgica (Amaral et al, 2016); tratamento de efluente do processo de branqueamento de pastas kraf, utilizando cinzas volantes para remoção de matéria orgânica (Gao e Fatehi, 2018) e remoção de cádmio de efluentes da mineração como o uso de nanocompósitos de hidrogel (Fosso-Kankeu et al, 2017). A adsorção por diferentes materiais, tanto para remoção de compostos orgânicos naturais ou sintéticos, prova ser um processo de remoção eficaz e apresenta um passo de tratamento crucial, que minimiza a presença de poluentes nos efluentes.…”

Section: Adsorçãounclassified

Métodos físicos e químicos para o tratamento de efluentes

Ferrazzo¹,

Ferasso²,

Marangoni³

et al. 2018

Rev. Bras. Gest. Amb. Sustent.

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A busca por processos de tratamento de efluentes que sejam eficientes e garantam a segurança à saúde pública e ao meio ambiente tem sido um grande desafio nas últimas décadas, devido à presença de microrganismos persistentes e micropoluentes orgânicos e inorgânicos que resistem aos tratamentos convencionais. Assim, as tecnologias alternativas de tratamento de efluentes vêm sendo aplicadas em associação aos tratamentos primários e secundários, para alcançar maiores reduções da carga de poluentes, utilizando menor espaço físico e consumo de energia elétrica, bem como menor produção de lodo. Neste trabalho, buscou-se realizar um estudo da arte através de uma revisão dos métodos físicos e químicos para o tratamento de efluentes: membranas de filtração, eletrocoagulação, adsorção, troca iônica, processos oxidativos avançados, ozonização e precipitação química, considerando o princípio de funcionamento suas vantagens, desvantagens e aplicações de cada técnica.

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“…Water pollution is currently a major problem worldwide partly due to the discharge of various contaminants into rivers, examples of such contaminants include the polycyclic aromatic hydrocarbons (PAHs), dyes, and toxic inorganic ions [1][2][3][4]. PAHs are common components in the coal, petroleum, and oil industries [5,6].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity of Gd2O2CO3·ZnO·CuO nanocomposite used for the degradation of phenanthrene

et al. 2018

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Multimetal oxides nanocomposite photocatalysts based on Gd 2 O 2 CO 3 •ZnO•CuO were prepared by a co-precipitation method and carefully characterized using a range of analytical techniques. More specifically, analysis by X-ray diffraction and electron microscopies confirmed the identity and quality of the as-synthesized powders. The photocatalytic degradation activities of these nanocomposites towards phenanthrene were then investigated by measuring the effects of catalyst dosage, irradiation time, and oxidant addition. In addition, the pseudo first-order kinetic model was used to determine the rate constant of the degradation reaction. Optimum dosages of 0.6, 0.6, and 0.4 gL −1 were recorded when using CuO, Cu-CuO/ZnO, and Gd 2 O 2 CO 3 •ZnO•CuO, respectively. In addition, the Gd 2 O 2 CO 3 •ZnO•CuO composite exhibited a higher removal efficiency than both Cu-CuO/ZnO and the pure CuO nanoparticles. Furthermore, the addition of oxidants influenced the removal of phenanthrene from solution. Finally, the photocatalytic degradation data followed pseudo first-order kinetics as defined by the Langmuir-Hinshelwood model, which allowed prediction of the faster degradation rate by the Gd 2 O 2 CO 3 •ZnO•CuO nanocomposite. The newly synthesized nanocomposite could therefore be considered for the removal of phenanthrene and related polycyclic aromatic hydrocarbons from contaminated water.

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Thermodynamic properties and adsorption behaviour of hydrogel nanocomposites for cadmium removal from mine effluents

Cited by 127 publications

References 48 publications

Efficient copper removal from wastewater through montmorillonite‐supported hydrogel adsorbent

Efficient copper removal from wastewater through montmorillonite‐supported hydrogel adsorbent

Métodos físicos e químicos para o tratamento de efluentes

Photocatalytic activity of Gd2O2CO3·ZnO·CuO nanocomposite used for the degradation of phenanthrene

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