Simultaneous adsorption–degradation of organic dyes using MnFe2O4/calcium alginate nano-composites coupled with GOx and laccase

Shojaat, Rahim; Saadatjoo, Naghi; Karimi, Afzal; Aber, Soheil

doi:10.1016/j.jece.2016.02.029

Cited by 28 publications

(7 citation statements)

References 39 publications

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“…As a natural polysaccharide extracted from brown seaweeds, alginate has been commonly used for immobilization of laccase in the form of calcium alginate beads [18,19]. It is known that the activity of laccase in the solution can be enhanced by the addition of Cu 2+ ions [18] and that copper has a greater affinity for alginate than calcium during the gelation of alginate beads [20].…”

Section: Introductionmentioning

confidence: 99%

An Improved Method to Encapsulate Laccase from Trametes versicolor with Enhanced Stability and Catalytic Activity

Zhang

Chen

et al. 2018

Catalysts

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In this work, laccase from Trametes versicolor pretreated with copper ion solution was entrapped in copper alginate beads. The presence of laccase in copper alginate beads was verified by Fourier transform infrared (FTIR) spectroscopy. The alginate concentration used was optimized based on the specific activity and immobilization yield. After entrapment, laccase presents perfect pH stability and thermal stability with 2,2′-azinobis-(3-ethylbenzthiazoline-6-sulphonate) (ABTS) as the substrate. Moreover, laccase in copper alginate beads exhibits good reusability during continuous batch operation for removing 2,4-dichlorophenol. More importantly, owing to the coupled effect of copper ion activation and copper alginate entrapment, the entrapped laccase shows a 3.0-fold and a 2.4-fold increase in specific activity and 2,4-DCP degradation rate compared with that of free laccase, respectively.

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Section: Introductionmentioning

confidence: 99%

An Improved Method to Encapsulate Laccase from Trametes versicolor with Enhanced Stability and Catalytic Activity

Zhang

Chen

et al. 2018

Catalysts

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“…In general, it is expensive and the regeneration of the adsorbent for several steps may cause difficulties because of the loss of the textural properties. Consequently, this problem has led to a search for cheap and efficient alternate material such as sawdust, zeolite, chitosan, bentonite, and clay (Elsherbiny 2013;Shojaat et al 2016). The application of silica-based clays and polymers is favored for the adsorption of various organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Rhodamine 6G and humic acids on composite bentonite–alginate in single and binary systems

et al. 2018

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In this work, the preparation, characterization, and sorption of rhodamine 6G and humic acids on a composite sodium alginate-bentonite were investigated. Their structure and morphology were analyzed by several techniques, including Fourier transform infrared spectroscopy, X-ray diffraction, and N 2 adsorption at − 196 °C. A synergetic sorption mechanism was observed in binary systems; humic acids adsorption was enhanced by the presence of Rh6G in the mixture. The kinetic studies revealed that the sorption follows a pseudo-first-order kinetic model and the sorption capacities of Rh6G increased with the pH value. The Langmuir isothermal model well described the adsorption isotherm data, showing a maximum adsorption capacity for Rh6G up to 429.5 mg/g at 20 °C. On the basis of the data of the present investigation, it is possible to conclude that the composite exhibited excellent affinity for the dye and humic acids, and it can be applied to treat wastewater containing dye and natural organic matter.

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“…As shown in Figure S5, nearly 20% of MB was adsorbed on GOD after adsorption–desorption equilibration at pH 3, which is consistent with the enhanced degradation efficiency in the GOD–Fe 3 O 4 system. Such an adsorption effect of GOD can also promote the mass transfer of the substrate in the reaction system and improve the accessibility of the pollutant to catalysts, accelerating the process of oxidative degradation …”

Section: Resultsmentioning

confidence: 99%

Chemoenzymatic Cascade Reaction for Green Cleaning of Polyamide Nanofiltration Membrane

Zhang

Wan

et al. 2022

ACS Appl. Mater. Interfaces

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Chemical cleaning is indispensable for the sustainable operation of nanofiltration (NF) in wastewater treatment. However, the common chemical cleaning methods are plagued by low cleaning efficiency, high chemical consumption, and separation performance deterioration. In this work, a chemoenzymatic cascade reaction is proposed for pollutant degradation and polyamide NF membrane cleaning. Glucose oxidase (GOD) enzymatic reaction in this cascade system produces hydrogen peroxide (H2O2) and gluconic acid to trigger the oxidation of foulants by Fe3O4-catalyzed Fenton reaction. By virtue of the microenvironment (pH and H2O2 concentration) engineering and substrate enrichments, this chemoenzymatic cascade reaction (GOD–Fe3O4) exhibits a favorable degradation efficiency for bisphenol A and methyl blue (MB). Thanks to the strong oxidizing degradation, the water flux of the NF10 membrane fouled by MB is almost completely recovered (∼95.8%) after a 3-cycle fouling/cleaning experiment. Meanwhile, the chemoenzymatic cascade reaction improves the applicability of the Fenton reaction in polyamide NF membrane cleaning because it prevents the membrane from damaging by high concentration of H2O2 and inhibits the secondary fouling caused by ferric hydroxide precipitates. By immobilizing GOD on the aminated Fe3O4 nanoparticles, a reusable cleaning agent is prepared for highly efficient membrane cleaning. This chemoenzymatic cascade reaction without the addition of an acid/base/oxidant provides a promising candidate for sustainable and cost-effective cleaning for the polyamide NF membrane.

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Simultaneous adsorption–degradation of organic dyes using MnFe2O4/calcium alginate nano-composites coupled with GOx and laccase

Cited by 28 publications

References 39 publications

An Improved Method to Encapsulate Laccase from Trametes versicolor with Enhanced Stability and Catalytic Activity

An Improved Method to Encapsulate Laccase from Trametes versicolor with Enhanced Stability and Catalytic Activity

Adsorption of Rhodamine 6G and humic acids on composite bentonite–alginate in single and binary systems

Chemoenzymatic Cascade Reaction for Green Cleaning of Polyamide Nanofiltration Membrane

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