Bio-deoxygenation of water using glucose oxidase immobilized in mesoporous MnO2

Karimi, Afzal; Mahdizadeh, Fatemeh; Salari, Dariush; Niaei, Aligholi

doi:10.1016/j.desal.2011.02.053

Cited by 23 publications

(9 citation statements)

References 33 publications

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“…Mesoporous MnO 2 was prepared according to the method described in our previous work [20]. 80 ml CCl 4 and 30 ml of 1 M MnCl 2 solutions were added to a container and made a biphasic system.…”

Section: Preparation Of Mesoporous Mnomentioning

confidence: 99%

“…There are certain requirements for the supports used in immobilization process that should be fulfilled to increase the efficiency of the process, such as large internal surface and high superficial density, and easy recovery of support at the end of process [17], which are all satisfied by utilizing MnO 2 as an immobilization host [18]. In our previous work, MnO 2 nanoparticles were also successfully used as a support for immobilization of glucose oxidase [20]. In our previous work, MnO 2 nanoparticles were also successfully used as a support for immobilization of glucose oxidase [20].…”

mentioning

confidence: 99%

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Use of mesoporous MnO2 as a support for immobilization of lipase from Candida rugosa

Babaei¹,

Karimi²,

Hejazi³

2014

CI&CEQ

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Article Highlights• We used a new mesoporous carrier for immobilization of lipase from Candida rugosa • The amount of enzyme loading on support was reached to 700 units per 1 g of support • The thermal resistance of the enzyme was enhanced by immobilization • The physical adsorption of enzyme to the support was strong Abstract In this study, immobilization of lipase from Candida rugosa on mesoporous manganese dioxide by adsorption was carried out and the effect of three immobilization variables including temperature, process time and enzyme/support ratio on immobilization efficiency were studied. The characteristics of synthesized MnO 2 and lipase-bound MnO 2 were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) methods. The porous property of the support particles was also studied by X-ray diffraction (XRD) and Brunauer, Emmett and Teller (BET) measurements. The thermal stability of immobilized lipase was determined to be better than that of free enzyme. Also the operational stability of lipase-bound MnO 2 was studied and showed an almost strong attachment of enzyme to support. The Michaelis-Menten kinetic parameters (K m and V max ) were also determined for both free and immobilized lipases. It was observed that there is an increase of the K m value (672.96 mg/ml) and a decrease of the V max value (130.99 U/mg) for the immobilized enzyme comparing with the corresponding values of the free lipase.

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Section: Preparation Of Mesoporous Mnomentioning

confidence: 99%

mentioning

confidence: 99%

Use of mesoporous MnO2 as a support for immobilization of lipase from Candida rugosa

Babaei¹,

Karimi²,

Hejazi³

2014

CI&CEQ

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“…The resulting material was washed with distilled water and was calcined at 500°C for 2 hours. The conditions of MS preparation and the obtaining of Fe-MM are shown in Figure 1 [18]. …”

Section: Syntesis Of the Fe-containing Materials (Fe-mm)mentioning

confidence: 99%

“…To get a catalyst we used clay mineral montmorillonite as a silica-alumina matrix [16,17] [18]. The synthesis of Fe-MM was performed according to the procedure presented in [18].…”

Section: Syntesis Of the Fe-containing Materials (Fe-mm)mentioning

confidence: 99%

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Catalytic Properties of Fe-containing Layered Aluminosilicates in Photo-oxidation of Dye “Methyl Green”

Shadrina

Dashinamzhilova

Khankhasaeva

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The iron-containing materials with an iron content of 40 mg/g and 52.5 mg/g, a specific surface area of 107 m 2 /g and 96 m 2 /g are developed on the basis of natural layered aluminosilicate (montmorillonite) and polyhydroxo complexes of iron. It is shown that the materials exhibit high catalytic activity in the photo-oxidation of dye "Methyl Green". The influence of physicochemical parameters (loading of the catalyst, a ratio of initial concentrations [H 2 O 2 ]/[MG] on the efficiency of the dye photo-oxidation was established. The optimum conditions, which made it possible to achieve high mineralization and 100 % the dye oxidation efficiency were determined: the catalyst loading equal to 1.0 g/l and the ratio of [H 2 O 2 ] and [MG] equal to stoichiometric ratio (55 mol/mol). The decrease of the total organic carbon content after photo-oxidation reaction was 56.5%. The average value of the quantum yield of the dye photo-oxidation was to 0.30 mol/Einstein. The results of the conducted research show that the developed iron-containing materials are the promising catalysts for photo-Fenton processes of oxidative degradation of organic compounds. The materials are of interest for use in wastewater treatment processes from toxic organic pollutants.

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Facile synthesis and electrochemical properties of α‐MnO₂ as electrode material for supercapacitors

Fan

Chen

et al. 2013

Asia-Pacific J Chem Eng

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MnO 2 as the electrode material for supercapacitors has attracted much interest in recent years. However, there are still some restrictions for its application. In this paper, to improve the capacitive properties of MnO 2 , material was synthesized by a facile and efficient low-temperature reduction reaction between KMnO 4 and Cu foil in sulfuric acid solutions. The results showed that the initial concentrations of KMnO 4 and the addition of concentrated sulfuric acid have distinct influence on the structure, morphology and electrochemical properties of the as-prepared MnO 2 . Particularly, morphological characterization displayed that the sample synthesized in 0.05 mol L À1 KMnO 4 and 16 mL concentrated sulfuric acid is composed of urchins with the average diameter of 0.7 mm. The product exhibits a discharge specific capacitance of 288.03 F g À1 at the constant current density of 65 mA g À1 . The capacitance remains about 50% of the initial capacitance at 250 mA g À1 , and is 100.06 F g À1 after the 100th cycle.

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Bio-deoxygenation of water using glucose oxidase immobilized in mesoporous MnO2

Cited by 23 publications

References 33 publications

Use of mesoporous MnO2 as a support for immobilization of lipase from Candida rugosa

Use of mesoporous MnO2 as a support for immobilization of lipase from Candida rugosa

Catalytic Properties of Fe-containing Layered Aluminosilicates in Photo-oxidation of Dye “Methyl Green”

Facile synthesis and electrochemical properties of α‐MnO₂ as electrode material for supercapacitors

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Bio-deoxygenation of water using glucose oxidase immobilized in mesoporous MnO2

Cited by 23 publications

References 33 publications

Use of mesoporous MnO2 as a support for immobilization of lipase from Candida rugosa

Use of mesoporous MnO2 as a support for immobilization of lipase from Candida rugosa

Catalytic Properties of Fe-containing Layered Aluminosilicates in Photo-oxidation of Dye “Methyl Green”

Facile synthesis and electrochemical properties of α‐MnO2 as electrode material for supercapacitors

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Product

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Facile synthesis and electrochemical properties of α‐MnO₂ as electrode material for supercapacitors