Rapid Adsorption of Crystal Violet onto Magnetic Zeolite Synthesized from Fly Ash and Magnetite Nanoparticles

Amodu, Olusola Solomon; Ojumu, Tunde Victor; Ntwampe, Seteno Karabo Obed; Ayanda, Olushola Sunday

doi:10.4236/jeas.2015.54016

Cited by 35 publications

(22 citation statements)

References 36 publications

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“…In recent years, there has been growing interest in the search for cheaper sources, such as low-cost adsorbent materials, for the immobilization of dyes and heavy metals from mixtures [11][12][13][14][15][16][17]. For this reason, there are studies on the utilization of this solid waste [18][19][20][21][22] for the removal of heavy metals [23][24][25] and dyes [26][27][28] from polluted waters.…”

Section: Introductionmentioning

confidence: 99%

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Novel Application of Mineral By-Products Obtained from the Combustion of Bituminous Coal–Fly Ash in Chemical Engineering

2020

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The aim of this work was the chemical modification of mineral by-products obtained from the combustion of bituminous coal (FA) treated with hydrogen peroxide (30%), used as an adsorbent for the removal of Cr(III) and Cd(II) ions and crystal violet (CV) from a mixture of heavy metal and organic dye in a solution containing either Cr(III)–CV or Cd(II)–CV. Fourier transform infrared (FT-IR), thermogravimetric analysis (TG), scanning electron microscopy–energy dispersive spectroscopy (SEM-EDS), and X-ray diffraction (XRD) analyses suggested that the mechanism of Cr(III)–CV or Cd(II)–CV sorption onto FA–H2O2 includes ion-exchange and surface adsorption processes. The effect of pH on the adsorption equilibrium was studied. The maximum adsorption was found for pH values of 9. The values of the reduced chi-square test (χ2/degree of freedom (DoF)) and the determination coefficient R2 obtained for the sorbate of the considered isotherms were compared. Studies of equilibrium in a bi-component system by means of the extended Langmuir (EL), extended Langmuir–Freundlich (ELF), and Jain–Snoeyink (JS) models were conducted. The estimation of parameters of sorption isotherms in a bi-component system, either Cr(III)–CV or Cd(II)–CV, showed that the best-fitting calculated values of experimental data for both sorbates were obtained with the JS model (Cr(III) or CV) and the EL model (Cd(II) or CV). The maximum monolayer adsorption capacities of FA–H2O2 were found to be 775, 570 and 433 mg·g−1 for Cr, Cd and CV, respectively. Purification water containing direct Cr(III) or Cd(II) ions and CV was made with 90%, 98% and 80% efficiency, respectively, after 1.5 h. It was found that the chemical enhancement of FA from coal combustion by H2O2 treatment yields an effective and economically feasible material in chemical engineering for the treatment of effluents containing basic dyes and Cr(III) and Cd(II) ions.

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Section: Introductionmentioning

confidence: 99%

“…It is a typical cationic dye that has been widely used as a colorant in textile products. Incrustation is the most visible effect of wastewater discharge from the textile industry [28,30]. The distribution of compounds containing Cr(III) and Cr(VI) depends on the redox potential.…”

Section: Introductionmentioning

confidence: 99%

Novel Application of Mineral By-Products Obtained from the Combustion of Bituminous Coal–Fly Ash in Chemical Engineering

2020

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“…Rhodamine B (RB) is a highly water-soluble, basic red dye of the xanthene class [3]. It is a typical cationic dye that has been widely used as a colorant in textile products [7]. The most visible effect of wastewater discharge from the textile industry is incrustation, which reduces light penetration into the water and can adversely affect marine life [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…It is a typical cationic dye that has been widely used as a colorant in textile products [7]. The most visible effect of wastewater discharge from the textile industry is incrustation, which reduces light penetration into the water and can adversely affect marine life [7,8]. Rhodamine B is used as the active medium in pulsed and continuous wave lasers, as a staining fluorescent dye in biology, and as a tracer dye to track the movement of water.…”

Section: Introductionmentioning

confidence: 99%

Immobilizing and Removal of Cadmium and Rhodamine B from an Aqueous System by Converting Solid Waste from Poland; Studies of Equilibrium and Kinetic Sorption

Sočo¹,

Kalembkiewicz²

2020

Pol. J. Environ. Stud.

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The presented work introduces the chemical modification of coal fly ash (FA) treated with NaOH and hexadecyltrimethylammonium bromide (HDTMABr) used as adsorbent for the removal of cadmium(II) ions and rhodamine B (RB) from aqueous solution. The FTIR spectrum shows the presence of organic and inorganic entities that are also seen on the XRD chart. The SEM analysis shows clearly the surface morphology and roughness of FA-HDTMABr. The effect of pH on adsorption equilibrium was studied. Maximum adsorption was found for pH values of 9. The Cd(II) ions and RB dye sorption is attributed to different mechanisms of the ion-exchange processes as well as to the adsorption. On the basis of reduced chi-square test (χ 2 /DoF) values obtained for both sorbates of the considered isotherms, the fitting degree follows the immediate sequence: Langmuir>Jovanović>Redlich-Peterson>Tóth>Freundl ich>generalized Langmiur-Freundlich>extended Jovanović>Halsey>Temkin>Dubinin-Radushkevich> Fumkin-Fowler-Guggenheim>Fowler-Guggenheim-Jovanović-Freundlich>Brunauer Emmett and Teller. The maximum monolayer adsorption capacity of the FA-HDTMABr was found to be 744 mg·g -1 and 666 mg·g -1 for Cd(II) and RB, respectively. The PFO, PSO, Elovich mass transfer, liquid film diffusion and intra-particle diffusion models were analysed. The PSO model (R 2 = 0.996) was slightly lower for Cd than those of the PFO model (R 2 <0.7), which is an indication that the PSO model was better than the PFO model. Purification water containing direct Cd and RB was made with 94% efficiency after 1 hour. We found that the chemical enhancement of FA from coal combustion by HDTMABr treatment yields an effective and economically feasible material for the treatment of basic dye and Cd(II) ions containing effluents.

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“…CV encapsulation and entrapment in matrices such as particles made of acrylamide and acrylates derivatives or in magnetic zeolite nanoparticles and in sol-gel silica clusters were reported [9,11,12]. However, the mentioned systems are requiring chemical synthetic precursors (i.e., acrylamide, tetraethoxysilane) or materials produced by coal combustion (i.e., fly ash) which are not environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

Development of Crystal Violet encapsulation in pectin - Arabic gum gel microspheres

Revuelta

Villalba

Navarro

et al. 2016

Reactive and Functional Polymers

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Six pectins with 35% to 91% methoxylation degree were purified and characterized to encapsulate Crystal Violet (CV). Amidated low methoxylated pectin (ALMP) was selected based on microsphere morphologies, aqueous solubility, viscosity and the effect of calcium concentration. Pectin microspheres were stabilized with Arabic gum (AG) and optimized according to the loading. Microspheres composed of 2.0% ALMP-1.0% AG crosslinked with 450 mM calcium(II) were able to encapsulate 217 ± 2 μM CV. Optical microscopy of the gels revealed spheroid microspheres with 250 ± 50 μm diameter containing homogenous CV distribution. Dried microspheres observed by SEM and epifluorescence showed a highly shrinkable matrix keeping the spheroidal morphology. Low relative viscosity of the ALMP-AG-CV solutions was found compared to ALMP and ALMP-AG. The Young moduli (60-80 Pa) of ALMP-AG microspheres by texturometric analysis indicated that the CV could interfere with the gel crosslinking. Raman spectroscopy analysis suggested some interaction of CV nucleophilic center within the matrix. FTIR of the matrix showed largest shifts in the carbonyl and carboxylate groups probably associated to H-bridges. CV stability studies performed on ALMP-AG microspheres, synthetized from polymer solutions with pH values above and below pectin pKa and showed faster CV release rates in presence of ionic strength.

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Rapid Adsorption of Crystal Violet onto Magnetic Zeolite Synthesized from Fly Ash and Magnetite Nanoparticles

Cited by 35 publications

References 36 publications

Novel Application of Mineral By-Products Obtained from the Combustion of Bituminous Coal–Fly Ash in Chemical Engineering

Novel Application of Mineral By-Products Obtained from the Combustion of Bituminous Coal–Fly Ash in Chemical Engineering

Immobilizing and Removal of Cadmium and Rhodamine B from an Aqueous System by Converting Solid Waste from Poland; Studies of Equilibrium and Kinetic Sorption

Development of Crystal Violet encapsulation in pectin - Arabic gum gel microspheres

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