Kumar_et_al-2017-Advanced_Materials.pdf (2025)

Efficiency evaluation of arsenic(III) adsorption of novel graphene oxide@iron-aluminium oxide composite for the contaminated water purification

Separation and Purification Technology, 2018

Prolong consumption of arsenic-rich drinking water causes serious health problem. Aiming to minimize the problem, it is attempted to develop cheap and advanced materials for arsenic extraction from the contaminated water. Thus, multifunctional graphene oxide (GO)-incorporated iron-aluminium mixed oxide (GIAMO) composite has been prepared with five different GO content, and evaluated by batch method for the arsenic(III) removal efficiency. Among the asprepared GIAMO samples, three samples consisting 1.0, 2.0 and 3.0 g of GO show equally good (92-95 %) arsenic(III) removal efficiency, which is 30-35 % higher than pristine iron-aluminium oxide (IAMO) from an aqueous solution (5.0 mg As III .L-1) at pH 7.0 (± 0.2) and 303 K. Thus, 1.0 g GO-inserted GIAMO (GIAMO-1) sample was characterized as microcrystalline (10-15 nm) with BET surface area about 1.45 times higher than IAMO and investigated for the arsenic(III) adsorption. Optimized pH for arsenic(III) adsorption is 6.0-8.0. The kinetic data agree more closely with pseudo-first order equation (R 2 = 0.98-0.99) than pseudo-second order equation (R 2 = analyses of arsenic-rich solid suggested that arsenic(III) is stabilized over the solid surface without oxidation by surface complex formation.

Synthesis and adsorption ability of manganese ferrite/graphene oxide nanocomposites for arsenic(V) removal from water

Vietnam Journal of Chemistry, 2020

This work aims to synthesise manganese ferrite/graphene oxide (MnFe 2 O 4 /GO) matrrials with various MnFe 2 O 4 contents from 20-60 wt.% in material for arsenic(V) (As(V)) removal. The nanocomposites were studied by X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller, and vibrating-sample magnetometry. The suitable mass ratio of MnFe 2 O 4 in nanocomposite for As(V) removal was 50 wt.% (MGO50). The adsorption process on MGO50 followed the pseudo-second-order kinetic and Langmuir isotherm models with the maximum adsorption amounts of 212.3 mg/g. Accordingly, MGO50 nanocomposite could be used as an effective adsorbent for removal of As(V) from water.

Multifunctional Iron oxide embedded reduced graphene oxide as a versatile adsorbent candidate for effectual arsenic and dye removal

Colloid and Interface Science Communications, 2020

Fabrication and adsorption properties of magnetic graphene oxide nanocomposites for removal of arsenic (V) from water

Adsorption Science & Technology

In this work, magnetic graphene oxide nanocomposites were synthesized by co-precipitation method and used as an adsorbent for removal of arsenic (V) ions from water. The structure and morphology of magnetic graphene oxide nanocomposites were studied by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, Brunauer–Emmett–Teller specific surface area, and vibrating sample magnetometry. Fourier transform infrared spectroscopy, X-ray diffraction, and transmission electron microscopy results of magnetic graphene oxide presented that the Fe3O4 nanoparticles in the size range of 10–25 nm were decorated on graphene oxide nanosheets. The adsorption properties of magnetic graphene oxide nanocomposites for arsenic (V) from water were investigated to study the effects of magnetic graphene oxide mass ratio, contact time, pH, and initial concentration. The suitable magnetic graphene oxide mass ratio of nanocomposites for arsenic (V) adsorption was determin...

Manganese-incorporated iron(III) oxide–graphene magnetic nanocomposite: synthesis, characterization, and application for the arsenic(III)-sorption from aqueous solution

Journal of Nanoparticle Research, 2012

Removal of arsenic from water using crumpled graphite oxide

Green Processing and Synthesis, 2018

In this work, we fabricated crumpled graphite oxides (CGOs) from discharged electrodes of waste batteries by the cathodic plasma electrolysis process and applied it for arsenic (As) removal from water solutions. Several factors that affect the removal efficiency of As(III) were investigated, including pH, initial concentrations, and contact time. After 120 min of experiment [10 mg of CGO in 40 ml of 1 mg/l As(III) solution], the removal efficiency reached to as high as 98.6%. From the Langmuir isotherm model, the calculated maximum adsorption capacity (qmax) was found to be 47.39 mg/g. The results from this study showed that CGOs could be an effective adsorbent for As(III) removal from the water environment and acts as a promising adsorbent for other heavy metals from contaminated water.

Fabrication of ultrathin graphene oxide-coated membrane with hydrophilic properties for arsenate removal from water

Terms and conditions of current drinking water quality standards, including reducing the maximum arsenic concentration from 50 μgl-1 to 10 μgl-1 and predicted stricter standards in future, reveals the necessity for development of new technologies. This study aimed to prepare and evaluate a new nanocomposite membrane using graphene oxide (GO) thin layer to remove arsenic (v) from water. To fabricate the membrane, initially GO was prepared using the modified Hummers' method and then to gain a narrow-dispersed GO dispersion, several times centrifugation and sonication were performed. Then resultant dispersed GO was coated on a microporous flat-sheet polyethersulfone support by coating/deposition and vacuum filtration process. Performance of the synthesized membrane was assessed using a dead end filtration system. The results showed that pure water flux decreased as the coated GO thickness increased. Among the three prepared membranes, the greatest flux was attributed to M1 membrane with the value of 398.5 lm-2h-1 and the minimum flux was for M3 with a value of 131.3 lm-2h-1 at 4 bar of pressure. Furthermore, by increasing the coated GO, rejection of arsenate ions increased significantly. With initial concentration of 1000 ± 20 μgl-1, percentage of arsenate rejection for M1, M2 and M3 membranes were 41.8%, 73.5% and 86.7%, respectively. Relatively high removal by this novel membrane can be due to the exceptional properties of GO nanostructure and the presence of hydrophilic functional groups. KEYWORDS: Membrane,

A comparative study on As(V) removal by graphene oxide (GO) and functionalized reduced graphene oxide (fRGO)

2019

Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711 103, West Bengal, India E-mail: sgcoolspandan@gmail.com Manuscript received online 28 January 2019, accepted 25 March 2019 Industrial wastewater contains heavy metals like arsenic which may enter into the food chain and may affect human beings. In this study As(V) removal was done by GO and fRGO and a comparative study was made. At equilibrium pH (pH 6) fRGO gives more As(V) removal than GO. For both the materials, Langmuir adsorption isotherm fit better than Freundlich isotherm. The adsorption capacities of GO and fRGO are determined (12.04 mg/g) and (28.57 mg/g) respectively. Both materials follow pseudo-second order removal kinetics and fRGO (0.09 g/mg/min) shows a faster removal rate than GO (0.07 g/mg/min). It was found that fRGO can remove 2.4 times more arsenic than graphene oxide (GO).

Removal of Arsenic, Chromium and Uranium from Water Sources by Novel Nanostructured Materials Including Graphene-Based Modified Adsorbents: A Mini Review of Recent Developments

Applied Sciences

Groundwater is commonly used as a drinking water resource all over the world. Therefore, groundwater contamination by toxic metals is an important issue of utmost concern for public health, and several technologies are applied for their effective removal, such as coagulation, ion exchange, adsorption, and membrane applications like reverse osmosis. Adsorption is acknowledged as a simple, effective and economic technology, which has received increased interest recently, despite certain limitations regarding operational applications. The respective scientific efforts have been specifically focused on the development and implementation of novel nano-structured adsorbent materials, which may offer extensive specific surface areas, much higher than the conventional adsorbents, and hence, are expected to present higher removal efficiencies of pollutants. In this paper, the recent developments of nanomaterial applications for arsenic, chromium and uranium removal from groundwaters are crit...

Functionalized graphene sheets for arsenic removal and desalination of sea water

Desalination, 2011

Water pollution is a major problem in the global context and main cause of some diseases especially in India. Graphene has fascinated the scientific community by its different novel properties for various applications. In the present work, we have synthesized the graphene sheets by hydrogen induced exfoliation of graphitic oxide followed by functionalization. Graphene sheets were characterized by electron microscopy, X-ray diffraction, infra-red and Raman spectroscopy techniques. These functionalized graphene sheets were used for simultaneous removal of high concentration of inorganic species of arsenic (both trivalent and pentavalent) and sodium from aqueous solution using supercapacitor based water filter. In addition, these functionalized graphene sheets based water filter was used for desalination of sea water. Adsorption isotherms and kinetics were studied for the simultaneous removal of sodium and arsenic. Maximum adsorption capacities, using Langmuir isotherm, for arsenate, arsenite and sodium were found to be nearly 142, 139 and 122 mg/g, respectively. High adsorption capacity for both inorganic species of arsenic and sodium along with desalination ability of graphene based supercapacitor provides a solution for commercially feasible water filter.