Fabrication, characterization and application of pectin degrading Fe3O4–SiO2 nanobiocatalyst

Seenuvasan, Muthulingam; Malar, Carlin Geor; Preethi, Sridhar; Balaji, N Sri; Iyyappan, Jeyaraj; Kumar, Madhava Anil; Kumar, Kannaiyan Sathish

doi:10.1016/j.msec.2013.01.050

Cited by 58 publications

(24 citation statements)

References 24 publications

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“…Peaks at 3416 and 1630 cm 21 corresponded to OH stretching and bending vibrations of surface hydroxyl groups of CeO 2 nanoparticles or adsorbed moisture. The figure clearly indicated the formation of new peaks at 788 and 799 cm 21 , which can be attributed to As(III)-CeO 2 and As(V)-CeO 2 , respectively [42]. Pena et al (2006) demonstrated the peak for uncomplexed As(III)-O bond of dissolved arsenite at 795 cm 21 [43].…”

Section: Zeta Potential and Ftir Studies Of Ceo 2 Nanoparticlesmentioning

confidence: 93%

“…Cu Ka radiation (k 5 0.154 nm) source with applied voltage of 40 kV and current of 40 mA was used. The diffractogram was recorded at 2h values of 10-858 changing with a speed of 0.058 s 21 .…”

Section: Characterization Of Cerium Oxide Nanoparticlesmentioning

confidence: 99%

“…where, C e is the equilibrium concentration of adsorbate in ppm and Q e is the amount adsorbed at equilibrium in mg g 21 . Q m is the maximum adsorbed amount in mg g 21 and b is the Langmuir constant, which relates the affinity of adsorbate with binding sites of adsorbent.…”

Section: Langmuir Isothermmentioning

confidence: 99%

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Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

Mishra

Saxena

Rawat

et al. 2017

Env Prog and Sustain Energy

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Cerium oxide (CeO 2 ) nanoparticles of size 3-5 nm and surface area 257 m 2 g 21 were synthesized using simple, single-pot, and surfactant-free aerogel process. Efforts were made to tune the surface area and porosity of CeO 2 nanoparticles by changing the concentration of precursors. CeO 2 nanoparticles were characterized by TEM, SEM, XRD, N 2 -BET, and FTIR. Prepared CeO 2 was used to remove As(III) and As(V) from water at variable contaminant concentrations (25-100 ppm) and pH (3-10). The adsorption process found extremely fast for the first few minutes of exposure. CeO 2 nanoparticles indicated adsorption capacities of 71.9 and 36.8 mg g 21 against As(III) and As(V), respectively. The adsorption data best fitted with Redlich-Peterson model, depicting monolayer adsorption. The adsorption followed pseudo-second-order kinetics and intraparticle diffusion with three-step diffusion process. The effect of co-existing anions (H 2 PO 2 4 , SO 22 4 , and HCO 2 3 ) indicated 80-96% reduction in adsorption capacity.

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Section: Zeta Potential and Ftir Studies Of Ceo 2 Nanoparticlesmentioning

confidence: 93%

Section: Characterization Of Cerium Oxide Nanoparticlesmentioning

confidence: 99%

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Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

Mishra

Saxena

Rawat

et al. 2017

Env Prog and Sustain Energy

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“…Some other benefits of this technology could be referred to large specific surface area, high surface energy, and selectivity that would result in higher removal rate of toxic metals [22,23]. Therefore, coating the surface of iron-oxide containing sorbents with inorganic materials such as gold, silica, or silver is beneficial to avoid such limitations [25][26][27]. It has also been found that bare magnetic nanoparticles are susceptible to oxidation and losing magnetic properties when pH is lower than 4 [24].…”

Section: Introductionmentioning

confidence: 99%

“…It has also been found that bare magnetic nanoparticles are susceptible to oxidation and losing magnetic properties when pH is lower than 4 [24]. Therefore, coating the surface of iron-oxide containing sorbents with inorganic materials such as gold, silica, or silver is beneficial to avoid such limitations [25][26][27]. Silica has been regarded as one of the most suitable materials used as protective layer for magnetic Fe 3 O 4 nanospheres due to its excellent chemical stability, biocompatibility, and chemically modifiable surface [28].…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of arsenic from aqueous solutions using magnetite nanoparticles and silica‐coated magnetite nanoparticles

Jamali-Behnam

Najafpoor

Davoudi

et al. 2017

Env Prog and Sustain Energy

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Magnetite nanosorbents are known with high sorption capacity and ease of solid phase separation from surrounding liquid by the imposed external magnetic field. In this study, magnetite nanoparticles (MNPs) and silica‐coated magnetite nanoparticles (Si‐MNPs) were prepared and used for the removal of arsenic (III) from aqueous solutions. The nanosorbents were characterized by transmission electron microscope, X‐ray diffraction, Fourier transform infrared spectroscopy, and vibrating sample magnetometer. The spherical Fe3O4 nanoparticles in diameter of about 100 nm and SiO2 shells of 12 nm were formed. The saturation magnetization was found to be 78 and 58 e mug–1 for MNPs and Si‐MNPs, respectively. Under optimal conditions, both nanosorbents were very efficient for arsenite uptake (removal efficiency ≥99%). The highest removal percentage was obtained near PZC of nanosorbents where the net surface charge was zero. The MNPs exhibited higher sorption capacities in comparison with Si‐MNPs although they tended to be agglomerated in higher applied doses. The kinetic of experiments indicated the best fit to the pseudo‐second order model. Furthermore, the experimental data were best described by the Langmuir model. This study demonstrated the effectiveness of bare and silica coated magnetic nanoparticles to remove trace concentrations of arsenic (III) in water environment. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 951–960, 2018

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Fabrication of a Chitosan‐Coated Magnetic Nanobiocatalyst for Starch Hydrolysis

Jain

Sebatini

Sharmila³

et al. 2015

Chem Eng & Technol

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The preparation of chitosan-coated magnetic nanoparticles (MNPs) and covalent immobilization of a-amylase for starch hydrolysis was investigated. Surface morphology, chemical composition, and structural characteristics of the MNPs were analyzed by scanning electron microscopy, energy dispersion spectrometry, and X-ray diffractometry, respectively. Surface functional groups of MNPs, chitosancoated MNPs, and a-amylase-immobilized MNPs were characterized by Fourier transform infrared spectroscopy. Response surface methodology based on three levels was implemented to optimize three immobilization conditions and a regression model was developed. a-Amylase-immobilized MNPs provided better stability towards pH and temperature. The prepared thermostable nanobiocatalyst is well-suited for industrial processes involving starch hydrolysis.a-Amylase, chitosan, ferric chloride, ferrous sulfate, ammonium hydroxide, and solvents were purchased from Hi-media, www.cet-journal.com

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Fabrication, characterization and application of pectin degrading Fe3O4–SiO2 nanobiocatalyst

Cited by 58 publications

References 24 publications

Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

Adsorptive removal of arsenic from aqueous solutions using magnetite nanoparticles and silica‐coated magnetite nanoparticles

Fabrication of a Chitosan‐Coated Magnetic Nanobiocatalyst for Starch Hydrolysis

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