Graphene–Fe3O4 (G–Fe3O4) composite was prepared from graphene oxide (GO) and FeCl3·6H2O by a one-step solvothermal route.

Nirmala Grace A

Centre for Nanotechnology Research

Vellore Campus

C. Santosh

P. Kollu

Santhosh C

Sejal Doshi

Kollu P

Madhulika Sharma

Doshi S

D. Bahadur

Sharma M

M.T. Vanchinathan

Adsorption isotherms

Aromatic compounds

Cells

Cytology

Escherichia coli

Graphene

Lead

Metal ions

Photodegradation

Stripping (dyes)

Thermodynamics

Transmission electron microscopy

X ray powder diffraction

Adsorption capacities

Adsorption process

Anti-bacterial studies

Antibacterial properties

Degradation capacity

Field emission scanning electron microscopy

Langmuir adsorption isotherms

Photodegradation of methylene blue

Adsorption

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

RSC Advances

In this study, cobalt ferrites (C) decorated onto 2D material (porous graphene (PG)) and 1D material (carbon nanofibers (CNF)), denoted as PG-C and CNF-C nanocomposites, respectively, were synthesized using solvothermal process. The prepared nanocomposites were studied as magnetic adsorbents for the removal of lead (cationic) and chromium(VI) (anionic) metal ions. The structural and chemical analysis of synthesized nanocomposites was conducted using different characterization techniques including Brunauer-Emmett-Teller (BET) analysis, field emission-scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), high resolution-transmission electron microscopy (HR-TEM), vibrating sample magnetometer (VSM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Batch mode adsorption studies were conducted with the prepared nanocomposites to examine their maximum adsorption potential for lead and chromate ions. Performance parameters (time, pH, adsorbent dosage and initial ion concentrations) effecting the adsorption capacity of the nanocomposites were optimized. Different kinetic and isotherm models were examined to elucidate the adsorption process. Synthesized nanocomposites exhibited significant potential for the studied metal ions that can be further examined at pilot scale for the removal of metal ions from contaminated water. © 2017 The Author(s).

Fulltext

Scientific Reports

Removal of cationic and anionic heavy metals from water by 1D and 2D-carbon structures decorated with magnetic nanoparticles

Water pollution by various toxic contaminants has become one of the most serious problems worldwide. Various technologies have been used to treat water and waste water including chemical precipitation, ion-exchange, adsorption, membrane filtration, coagulation–flocculation, flotation and electrochemical methods. From past few decades, nanotechnology has gained wide attention and various nanomaterials have been developed for the water remediation. In the present review article, various nanomaterials have been reviewed which have been used for water decontamination. The special emphasis in the review has been given on adsorption, photocatalytic and antibacterial activity of nanomaterials.

Chemical Engineering Journal

Role of nanomaterials in water treatment applications: A review

Graphene manganese ferrite (MnFe 2 O 4 -G) composite was prepared by a solvothermal process. The as-prepared graphene manganese ferrite composite was tested for the adsorption of lead (Pb(II)) and cadmium (Cd(II)) ions by analytical methods under diverse experimental parameters. With respect to contact time measurements, the adsorption of Pb and Cd ions increased and reached equilibrium within 120 and 180 min at 37°C with a maximum adsorption at pH 5 and 7 respectively. The Langmuir model correlates to the experimental data showing an adsorption capacity of 100 for Pb(II) and 76.90 mg g -1 for Cd(II) ions. Thermodynamic studies revealed that the adsorption of Pb and Cd ions onto MnFe 2 O 4 -G was spontaneous, exothermic and feasible in the range of 27-47°C. Cytotoxicity behavior of graphene against bacterial cell membrane is well known. To better understand its antimicrobial mechanism, the antibacterial activity of graphene and MnFe 2 O 4 -G nanocomposite was compared. Under similar concentration and incubation conditions, nanocomposite MnFe 2 O 4 -G dispersion showed the highest antibacterial activity of 82%, as compared to graphene showing 37% cell loss. Results showed that the prepared composite possess good adsorption efficiency and thus could be considered as an excellent material for removal of toxic heavy metal ions as explained by adsorption isotherm. Hence MnFe 2 O 4 -G can be used as an adsorbent as well as an antimicrobial agent. © 2014 Elsevier B.V. All rights reserved.

Applied Surface Science

Solvothermal synthesis of MnFe 2 O 4 -graphene composite-Investigation of its adsorption and antimicrobial properties

Magnetic cobalt and nickel ferrites with graphene nanocomposites (GCF &amp; GNF) were tested for removal of Pb2+ and Cd2+ ions. A highest adsorption was achieved for Pb2+viz. 142.8 and 111.1 mg g−1 and for Cd2+ 105.26 and 74.62 mg g−1 for GCF and GNF.

CoFe2O4 and NiFe2O4@graphene adsorbents for heavy metal ions – kinetic and thermodynamic analysis

The present works demonstrate the formation of reduced graphene oxide (r-GO) and aminopyridine (r-GO-(AmPy)n) hybrid by submerged liquid plasma process. Raman spectra shows the ID/IG ratio of GO, r-GO and r-GO-(AmPy)n are 2.2, 1.91 and 2.0, respectively. The decrease in ID/IG ratio of r-GO clearly indicate the reduction of oxygen functional groups and restoration of sp2 network in r-GO domain. The pyridinic and pyrrolic functional group present in rGO-(AmPy)n hybrids shows a distinct redox peaks in cyclic voltameter at the scan rates of 5, 10 and 25 mV/s. The r-GO-(AmPy)n hybrid displayed an excellent electrochemical performance with a high specific capacitance of 418, 400 and 381 F/g at the current densities of 0.1, 0.2 and 0.3 A/g, respectively. Electro chemical generation of H2O2 at the rGO-(AmPy)n surface was evaluated and found to be 0.72 mmol for the fixed reaction time of 60 min. Similarly, conversion of H2O2 to [rad]OH radical with a coated Fe3O4 plate catalyst was found to be 0.15 mmol. A H2O2/[rad]OH radicals generated in the electrochemical cell was used for the degradation of methyl parathion. During the degradation (7.5 mg/L), two intermediates like methylparaoxon, and p-nitrophenol were identified by the Gas Chromatography and Mass Spectrometer analysis. © 2017

Journal of Hazardous Materials

Low energy liquid plasma for direct reduction and formation of rGO-aminopyridine hybrid for electrical and environmental applications

This paper describes a green method for the synthesis of graphenic material from cane sugar, a common disaccharide. A suitable methodology was introduced to immobilize this material on sand without the need of any binder, resulting in a composite, referred to as graphene sand composite (GSC). Raman spectroscopy confirmed that the material is indeed graphenic in nature, having G and D bands at 1597 and 1338 cm -1, respectively. It effectively removes contaminants from water. Here, we use rhodamine 6G (R6G) as a model dye and chloropyrifos (CP) as a model pesticide to demonstrate this application. The spectroscopic and microscopic analyses coupled with adsorption experiments revealed that physical adsorption plays a dominant role in the adsorption process. Isotherm data in batch experiments show an adsorption capacity of 55 mg/g for R6G and 48 mg/g for CP, which are superior to that of activated carbon. The adsorbent can be easily regenerated using a suitable eluent. This quick and cost-effective technique for the into a commercial water filter with appropriate engineering. © 2012 American Chemical Society.

ACS Applied Materials and Interfaces

Graphene from sugar and its application in water purification

Materials Letters

High-performance asymmetric supercapacitors based on MnFe2O4/graphene nanocomposite as anode material

Nanoscale Research Letters

Characterization of magnetic nanoparticle by dynamic light scattering

Carbon

Graphene oxide enhances the Fenton-like photocatalytic activity of nickel ferrite for degradation of dyes under visible light irradiation

Graphene oxide–Fe2O3 hybrid material as highly efficient heterogeneous catalyst for degradation of organic contaminants

Adsorption, photodegradation and antibacterial study of graphene-Fe 3O4 nanocomposite for multipurpose water purification application

Journal	Data powered by TypesetRSC Advances
Publisher	Data powered by TypesetRoyal Society of Chemistry
ISSN	20462069
Open Access	No