scholarly journals Removal of hexavalent chromium from graphene oxide supported on a cellulose acetate and polyacrylic acid membrane

2021 ◽  
pp. 1-8
Author(s):  
Juan SÁNCHEZ-MÁRQUEZ ◽  
Rosalba FUENTES-RAMÍREZ ◽  
Zeferino GAMIÑO-ARROYO
Keyword(s):  
Graphene Oxide ◽  
Cellulose Acetate ◽  
Hexavalent Chromium ◽  
Polyacrylic Acid ◽  
Contact Time ◽  
Polymeric Membrane ◽  
Point Of Zero Charge ◽  
Inversion Method ◽  
Initial Concentration ◽  
Phase Inversion Method

This work focused on the study of the hexavalent chromium removal process from graphene oxide supported on a cross-linked cellulose acetate and polyacrylic acid polymeric membrane. The membranes were synthesized by the phase inversion method and Graphene oxide was added in proportions of 1% by weight to the polymeric material. Graphene oxide was obtained from crystalline graphite (Electron Microscope Science, No. 70230). The graphite was oxidized using the improved method of Hummers. The characterization of polymer and graphene oxide was made by Raman spectroscopy. The surface charge and point of zero charge of the materials were evaluated using a potentiometric titration method proposed by Loskutov and Kuzin. The removal of Cr (VI) was studied as a function of contact time and of initial concentration of Cr (VI). The removal of Cr (VI) (~90%) mainly occurs in a contact time from 32 to 64 h when the initial concentration of Cr (VI) is 1 mg/L.

scholarly journals Membrane Made of Cellulose Acetate with Polyacrylic Acid Reinforced with Carbon Nanotubes and Its Applicability for Chromium Removal

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
J. A. Sánchez-Márquez ◽  
R. Fuentes-Ramírez ◽  
I. Cano-Rodríguez ◽  
Z. Gamiño-Arroyo ◽  
E. Rubio-Rosas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cellulose Acetate ◽  
Polyacrylic Acid ◽  
Contact Time ◽  
Phase Inversion ◽  
Acid Sites ◽  
Inversion Method ◽  
Chromium Removal ◽  
Initial Concentration ◽  
Phase Inversion Method

Membranes made of carbon nanotubes and cellulose acetate with polyacrylic acid were designed in order to study their properties and their applicability for chromium removal. The membranes were prepared by phase inversion method using cellulose acetate and polyacrylic acid. Carbon nanotubes were added to the membrane during their process of synthesis in proportions of 1% by weight. The pores in the material are formed in layers, giving the effect of depth and forming a network. Both the carbon nanotubes and membranes were characterized by IR, Raman, and SEM spectroscopy. In addition, the concentration of acidic and basic sites and the surface charge in the materials were determined. The concentration of acid sites for oxidized nanotubes was 4.0 meq/g. The removal of Cr(VI) was studied as a function of contact time and of initial concentration of Cr(VI). The removal of Cr(VI) (~90%) mainly occurs in a contact time from 32 to 64 h when the initial concentration of Cr(VI) is 1 mg/L.

scholarly journals Cellulose acetate butyrate graphene oxide nanocomposite membrane: Fabrication, characterization, and performance

2020 ◽  
pp. 22-22
Author(s):  
Majed Alghamdi ◽  
Adel El-Zahhar
Keyword(s):  
Graphene Oxide ◽  
Cellulose Acetate ◽  
Water Flux ◽  
Cellulose Acetate Butyrate ◽  
Inversion Method ◽  
Dramatic Improvement ◽  
Salt Rejection ◽  
And Performance ◽  
Phase Inversion Method ◽  
Acetate Butyrate

In this study the effects of graphene oxide (GO) nanosheets on the physicochemical properties and performances of cellulose acetate butyrate (CAB) membranes were investigated. Nanocomposite membranes were fabricated using Cand a small amount of GO in the range of 0 to 0.07 wt.%, using a conventional phase-inversion method. Membranes were characterized by different methods and their performances were tested using a dead-end filtration system. Compared with pristine Cmembrane, experimental results demonstrated an improvement in features such as hydrophilicity, permeability, salt rejection, antifouling, and stability. The results proved an increase in the porosity and pore sizes of membranes with GO addition. Furthermore, the membrane containing 0.07 wt.% of GO exhibited a low contact angle of 37? and a dramatic improvement in water flux of about 450% (from 2 to 11 L/m2 h). Moreover, it demonstrated a salt rejection of 39% for NaCl and 87% for Na2SO4, corresponding to improvements of about 144% and 93%, respectively. Furthermore, the results revealed a higher antifouling property with an 86% improvement in flux recovery and higher stability in terms of performance and thermal properties compared to CAB.

scholarly journals Adsorptive removal of cationic and anionic dyes using graphene oxide

2018 ◽  
Vol 78 (4) ◽  
pp. 732-742 ◽  
Author(s):  
V. Sabna ◽  
Santosh G. Thampi ◽  
S. Chandrakaran
Keyword(s):  
Graphene Oxide ◽  
Contact Time ◽  
Uv Spectroscopy ◽  
Point Of Zero Charge ◽  
Order Kinetic ◽  
Dye Molecules ◽  
Anionic Dyes ◽  
Batch Mode ◽  
Initial Concentration ◽  
Adsorptive Removal

Abstract This paper presents the results of comparative study on the application of graphene oxide (GO) for the adsorptive removal of crystal violet (CV) and methyl orange (MO) in batch mode. GO, synthesised from graphite, was characterised by field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR) spectroscopy, point of zero charge (pHPZC) and ultra violet (UV) spectroscopy. Dispersion of GO in water revealed the conversion of hydrophobic graphite into hydrophilic. Performance with regard to adsorption of CV and MO on GO was evaluated at different values of the operational parameters such as contact time between GO and the dye molecules, dosage of GO, and initial concentration and pH of the dye solution. Uptake and percentage removal of the dyes increased with increase in contact time and adsorbent dosage, but declined with increase in initial concentration of the dye. Experimental data on the uptake of dye molecules by GO showed good fit with the Freundlich isotherm model and the pseudo second order kinetic model. The maximum uptake by GO was higher for CV (207.4 mg/g) than that for MO (37.2 mg/g). Results indicate that GO is an effective adsorbent for the removal of CV but not for MO.

scholarly journals Graphene oxide and graphite oxide used as reinforcement in composites synthesized from cellulose acetate and polyacrylic acid

2021 ◽  
pp. 6-13
Author(s):  
Juan Antonio Sánchez-Márquez ◽  
Rosalba Fuentes-Ramírez ◽  
Beatriz Ruíz-Camacho
Keyword(s):  
Graphene Oxide ◽  
Cellulose Acetate ◽  
Graphite Oxide ◽  
Polyacrylic Acid ◽  
Outer Edge ◽  
Synthesis Process ◽  
Inversion Method ◽  
Basic Sites ◽  
Structural Reinforcement

This work focused on the synthesis and characterization of composites, obtained based on polyacrylic acid and cellulose acetate, which incorporated graphite oxide and graphene oxide as structural reinforcement. The composites were obtained using the phase inversion method and the incorporation of the reinforcement, during the synthesis process, was carried out in proportions of 1% by weight. The characterization of the composites was carried out using IR, Raman, BET, SEM spectroscopy techniques and methods for determining acidic and basic sites. The results obtained showed that it is possible to synthesize composites that present a network configuration, made up of layers that give the material the effect of depth. Furthermore, it was possible to observe that both graphite oxide and graphene oxide were deposited on the outer edge of the hexagonal pores present in the material. Finally, the concentration values of acidic and basic sites were obtained. The presence of these sites could be associated with carboxylic groups inserted during the oxidation of graphitic materials and with non-reactive sites present in cellulose.

Purification of Contaminated Water with Chromium (VI) Using Pseudomonas aeruginosa

2016 ◽  
Vol 721 ◽  
pp. 143-148 ◽  
Author(s):  
Nora Noureddine ◽  
Samia Benhammadi ◽  
Fouad Kara ◽  
Hakim Aguedal ◽  
Abdelkader Iddou ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Hexavalent Chromium ◽  
Contact Time ◽  
Culture Broth ◽  
Contaminated Water ◽  
Toxic Heavy Metals ◽  
Initial Concentration ◽  
Chromium Vi ◽  
Batch System ◽  
Uncontaminated Soil

A bacterial strain Pseudomonas aeruginosa isolated from an uncontaminated soil has been used for the removal of hexavalent chromium (Cr (VI)). The experiments were carried out in batch system in a culture broth. The results obtained have shown that 100% of Cr (VI) are removed. Contact time, initial concentration of the hexavalent chromium, temperature, as well as the nature of the culture broth have influenced this elimination. To the initial concentration of 20g/L of Cr (VI) the elimination rates are lower, while the reverse occurs for an initial concentration of 8g/L. This study allows considering the use of Pseudomonas aeruginosa in the treatment of water polluted by toxic heavy metals such as Cr (VI).

scholarly journals Use of sweet ‘Pêra’ peel as an adsorbent in the treatment of textile effluents

2019 ◽  
Vol 23 (9) ◽  
pp. 716-722
Author(s):  
Ketyla K. R. do Nascimento ◽  
Fernando F. Vieira ◽  
Marcello M. de Almeida ◽  
Josué da S. Buriti ◽  
Aldre J. M. Barros ◽  
...  
Keyword(s):  
Contact Time ◽  
Exponential Model ◽  
Point Of Zero Charge ◽  
Infrared Analysis ◽  
Hydroxyl Groups ◽  
Solution Ph ◽  
Initial Concentration ◽  
Zero Charge ◽  
Adsorbed Quantity ◽  
Air Circulation

ABSTRACT The disposal of industrial wastewater into aquatic bodies without proper treatment can cause severe damage to the environment and human health. The objective of this study was to perform the drying of the sweet orange (Citrus sinensis L. Osbeck) peel cultivar Pêra and evaluate the viability of its use as biosorbent in the removal of a direct dye. Drying was carried out in an oven with air circulation at temperatures of 60 and 80 ºC. The mathematical models of Page, Henderson and Pabis, Logarithmic, Midilli and Two-term exponential were fitted to the moisture data as a function of time. The material was characterized by scanning electron microscopy, point of zero charge, and infrared spectroscopy. In the adsorption study, a complete 24 factorial design was used to analyze the influence of mass, initial concentration, solution pH and contact time on adsorbed quantity (qt) and removal percentage of the dye (R%). In the drying, the two-term exponential model fitted best to the experimental data. The characterization of the material indicated that the adsorbent has zero charge point of 3.5 and porous structure, and the infrared analysis indicated the presence of carboxylic and hydroxyl groups. In the adsorption, the adsorbed quantity of the dye increased under conditions of lower pH and biosorbent mass and higher initial concentration and contact time. The removal percentage of dye increases with higher biosorbent mass. The biosorbent used is a promising waste for the adsorption of the burgundy-16 dye.

scholarly journals Synthesis and performance of antifouling and self-cleaning polyethersulfone/graphene oxide composite membrane functionalized with photoactive semiconductor catalyst

2016 ◽  
Vol 75 (3) ◽  
pp. 670-685 ◽  
Author(s):  
Nadir Dizge ◽  
Hakan Gonuldas ◽  
Yasin Ozay ◽  
Hasan Ates ◽  
Kasim Ocakoglu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sol Gel ◽  
Composite Membranes ◽  
Graphite Powder ◽  
Inversion Method ◽  
Functionalized Membranes ◽  
Self Cleaning ◽  
And Performance ◽  
Pes Membrane ◽  
Phase Inversion Method

This study was performed to synthesize membranes of polyethersulfone (PES) blended with graphene oxide (GO) and PES blended with GO functionalized with photoactive semiconductor catalyst (TiO2 and ZnO). The antifouling and self-cleaning properties of composite membranes were also investigated. The GO was prepared from natural graphite powder by oxidation method at low temperature. TiO2 and ZnO nanopowders were synthesized by anhydrous sol–gel method. The surface of TiO2 and ZnO nanopowders was modified by a surfactant (myristic acid) to obtain a homogeneously dispersed mixture in a solvent, and then GO was functionalized by loading with these metal oxide nanopowders. The PES membranes blended with GO and functionalized GO into the casting solution were prepared via phase inversion method and tested for their antifouling as well as self-cleaning properties. The composite membranes were synthesized as 14%wt. of PES polymer with three different concentrations (0.5, 1.0, and 2.0%wt.) of GO, GO-TiO2, and GO-ZnO. The functionalization of membranes improved hydrophilicity property of membranes as compared to neat PES membrane. However, the lowest flux was obtained by functionalized membranes with GO-TiO2. The results showed that functionalized membranes demonstrated better self-cleaning property than neat PES membrane. Moreover, the flux recovery rate of functionalized membranes over five cycles was higher than that of neat membrane.

scholarly journals Elaboration and characterization of multilayer polymeric membranes: effect of the chemical nature of polymers

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Youcef Sedkaoui ◽  
Naima Abdellaoui ◽  
Omar Arous ◽  
Hakim Lounici ◽  
Noreddine Nasrallah ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Chemical Nature ◽  
Cellulose Triacetate ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Inversion Method ◽  
Ion Separation ◽  
Phase Inversion Method ◽  
Pvc Membranes

AbstractThe transport phenomena across polymeric membrane may be enhanced by applying various strengths inside or outside the system. Recently, polymer inclusion membrane (PIM) has been considered one of the most popular methods that acts as a sink for the contaminant and immobilizes it. In the literature, there is no report about how to achieve the synthesis of multi-layer PIMs. In this paper, an improvement of a novel category of membrane without carrier for performing ion separation is reported. Different membranes were elaborated from binary mixtures of polymers, cellulose triacetate (CTA), polymethyl methacrylate (PMMA) and polyvinyl chloride (PVC) using 2-nitrophenyl octyle-ether (NPOE) as plasticizer and carrier in the same time, in order to increase specific interactions between the different polymers. The membranes (Polymer 1– NPOE – Polymer 2) were synthesized by phase inversion method modified by changing the procedure of a plasticizer/carrier addition and characterized by FTIR, TGA, SEM, zeta potential and contact angle. The CTA-based membranes exhibited well-defined pores partially filled with the second polymer and NPOE. Overall, our results showed that the addition of NPOE resulted in homogeneous membranes with modified physical properties, such as thickness, and hydrophobicity. A study of transport of Pb(II) using the synthesized membranes was studied. Dialysis experiments of lead ions across a polymeric membrane have shown that (CTA + NPOE + PMMA) and (PMMA + NPOE + PVC) membranes proved a good performance in one stage by fixing 12.15 and 25.31% of lead, respectively, without any additionally added carrier and acids. These results confirm the affinity between a basic polymer (poly-methyl methacrylate) and the metallic ion (Pb2+).

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