Copper and nitrophenol pollutants removal by Na-montmorillonite/alginate microcapsules

Ely, Abdellahi; Baudu, Michel; Basly, Jean‐Philippe; Kankou, Mohamed Ould Sid’Ahmed Ould

doi:10.1016/j.jhazmat.2009.06.015

Cited by 61 publications

(23 citation statements)

References 28 publications

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“…The maximum amount of adsorbed PNP (Q max,PNP ), close to 1 mmol/g (140 mg/g), is comparable to that of other adsorbents reported in the literature where only activated carbon present a higher adsorption ( [8,[41][42][43][44][45][46][47]). CPyCl that showed that PNP was better adsorbed in its phenolate form [53].…”

Section: Adsorption Isotherm Of Pnpsupporting

confidence: 80%

Influence of a cationic surfactant on adsorption of p-nitrophenol by a magsorbent based on magnetic alginate beads

Obeid

Kolli

Talbot

et al. 2015

Journal of Colloid and Interface Science

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The paper focuses on the removal of p-nitrophenol by an adsorption process. A magnetic adsorbent was synthesized by encapsulation of magnetic functionalized nanoparticles using alginate as a green biopolymer matrix. A cationic surfactant, cetylpyridinium chloride (CPyCl), was used to confer a hydrophobic character to the magnetic beads and thus to promote their adsorption efficiency. The effect of different parameters such as initial concentrations of both PNP and CPyCl, contact time and solution pH value on the adsorption of PNP in the presence of CPyCl was investigated. It should be noted that combination of magnetic and adsorption properties in a same material is an interesting challenge which could overcome the recovery problems of pollutant-loaded adsorbent. min whereas 90% adsorption was attained within 2 hours. It should be noted that combination of magnetic and adsorption properties in a same material is an interesting challenge which could overcome the recovery problems of pollutant-loaded adsorbent.

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Section: Adsorption Isotherm Of Pnpsupporting

confidence: 80%

Influence of a cationic surfactant on adsorption of p-nitrophenol by a magsorbent based on magnetic alginate beads

Obeid

Kolli

Talbot

et al. 2015

Journal of Colloid and Interface Science

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“…Sodium alginate, a natural polymer extracted from seaweed, has been used in environmental decontamination, including the removal of organic compounds from water. For example, alginate filled with montmorillonite was used for the removal of nitrophenol and as a pesticide adsorbent (Barreca et al, 2014b;Ely et al, 2009;Fernández-Pérez et al, 1999;Gerstl et al, 1998). Sodium alginate exhibits a sol-gel transition when subjected to cation exchange, e.g.…”

Section: Introductionmentioning

confidence: 99%

The effect of montmorillonite clay in alginate gel beads for polychlorinated biphenyl adsorption: Isothermal and kinetic studies

Barreca

Orecchio

Pace

2014

Applied Clay Science

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Beads of alginate montmorillonite have been used as sorbent for polychlorinated biphenyls from aqueous solutions. The structure and the differences between the different beads were established by IR spectroscopy (FT-IR). The adsorption at 25°C has been studied in a batch system, following its kinetics and assessing adsorbent dose, initial PCB concentrations, and pH effects. The results show that increasing the initial concentration of the PCBs and the adsorption time favored the adsorption. Adsorption isotherm data were modeled using Chapman, Freundlich and Langmuir adsorption isotherms and the appropriate parameters were calculated. Adsorption of trichlorobiphenyls on alginate-montmorillonite beads followed a Freundlich isotherm type model, while adsorption of tetra-, penta-, and hexachlorobiphenyls displayed a sigmoid-shaped (S-type) isotherm fitting the Chapman sigmoidal equation with the highest non-linear R 2 values among the three tested models. By comparing the percentage adsorptions using the same number of beads (same volumes), best removals were obtained by using alginate montmorillonite beads. Kinetic models were investigated to determine the mechanism of adsorption showing a best fit for the pseudosecond order model (R 2 from 0.998 to 0.982). Moreover, to underline the effect of montmorillonite in alginate gel beads, we have compared the isothermal adsorption curves between alginate montmorillonite and alginate beads.

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“…In particular, montmorillonite/alginate beads (MABs) were prepared according to the procedure reported in the literature [29]. In turn, hybrid iron-enriched montmorillonitealginate beads (Fe-MABs) were prepared by mixing a 4% (w/v) sodium alginate aqueous solution (0.8 g in 20 mL) with a 20 mL aqueous suspension of Fe-Mont (1.6 g).…”

Section: Preparation Of Hybrid Montmorillonite-alginate Beads (Mabs)mentioning

confidence: 99%

“…Therefore, we decided to explore the possibility of using iron-enriched clay for the construction of stable hybrid alginate/clay beads as catalyst for heterogeneous photo-Fenton. By considering recent studies reporting the adsorption of 4-NP pollutant onto hybrid montmorillonite/alginate beads (MABs) [29] and the possibility to increase the iron content of the clay by ion exchange, we decided to prepare and characterize iron-enriched montmorillonite/alginate beads (Fe-MABs), and test them as heterogeneous catalysts for the photo-Fenton degradation of 4-NP as model pollutant.…”

Section: Introductionmentioning

confidence: 99%

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

Barreca

Colmenares

Pace

et al. 2014

Journal of Photochemistry and Photobiology A: Chemistry

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a b s t r a c tHybrid montmorillonite-alginate beads (MABs) were prepared by the ion-gelation method from alginate and montmorillonite clay suspension dropped in a calcium chloride solution. Similarly, iron-enriched beads (Fe-MABs) were prepared using iron-exchanged montmorillonite. All beads were characterized by atomic absorption and Fourier-transform infrared spectroscopy. The efficiency of Fe-MABs as catalysts for the solar photo-Fenton performed at initial pH = 7.0 was evaluated by varying the catalyst amount and hydrogen peroxide concentration, and monitoring the removal of 4-nitrophenol (4-NP) at initial concentration of 10 ppm. A kinetic analysis showed that the removal of 4-NP by Fe-MABs followed a pseudo first-order kinetics model (R 2 = 0.966). High 4-NP removal (75%) was achieved with 25 Fe-MABs by using 150 ppm of hydrogen peroxide and 40 min of irradiation, while total 4-NP removal was obtained by using 500 ppm of hydrogen peroxide. Moreover, preliminary studies about beads' recycling showed good removal efficiencies for the first three cycles.

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Copper and nitrophenol pollutants removal by Na-montmorillonite/alginate microcapsules

Cited by 61 publications

References 28 publications

Influence of a cationic surfactant on adsorption of p-nitrophenol by a magsorbent based on magnetic alginate beads

Influence of a cationic surfactant on adsorption of p-nitrophenol by a magsorbent based on magnetic alginate beads

The effect of montmorillonite clay in alginate gel beads for polychlorinated biphenyl adsorption: Isothermal and kinetic studies

Neutral solar photo-Fenton degradation of 4-nitrophenol on iron-enriched hybrid montmorillonite-alginate beads (Fe-MABs)

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