Adsorptive removal of cationic dye by synthesized sustainable xanthan gum-g p(AMPS-co-AAm) hydrogel from aqueous media: Optimization by RSM-CCD model

Gohari, Roghayeh Mohafezatkar; Safarnia, Mehrnaz; Koohi, Ahmad Dadvand; Salehi, Mahsa Baghban

doi:10.1016/j.cherd.2022.10.028

Cited by 35 publications

(11 citation statements)

References 51 publications

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“…The dye removal percentage increased from 64 to 95% when the photocatalyst dose was increased from 25 to 100 mg, and when the US power was increased from 30 to 100W. It is due to the high availability of active reaction sites, OH radicals, and electron–hole pairs 8 , 43 , 46 .…”

Section: Resultsmentioning

confidence: 99%

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Capability of TiO2 and Fe3O4 nanoparticles loaded onto Algae (Scendesmus sp.) as a novel bio-magnetic photocatalyst to degration of Red195 dye in the sonophotocatalytic treatment process under ultrasonic/UVA irradiation

Zamani,

Rastgar,

Hedayati

2023

Sci Rep

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In this study, the magnetic photocatalyst Scendesmus/Fe3O4/TiO2 was synthesized, and its sonophotocatalytic properties in relation to the degradation of the Red195 dye were evaluated. Particles were characterized using a scanning electron microscope (SEM), Fourier's transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and a vibrating-sample magnetometer (VSM). At a pH of 5, a photocatalyst dosage of 100 mg, an initial R195 concentration of 100 mg/l, an ultrasound power of 38W, and an exposure time of 20 min, the maximum Red195 removal efficiency (100%) was achieved. After five cycles of recycling, the composite's sonophotocatalytic degradation stability for R195 remains above 95%. Experiments on scavenging indicate that electrons (h+) and hydroxyls (OH-) are indispensable decomposition agents. The removal of R195 by Scendesmus/Fe3O4/TiO2 is consistent with the pseudo-first-order kinetic, Freundlich, and Henderson's isotherm models, as determined by kinetic and isotherm investigations. The negative activation enthalpy of the standard (ΔH°) illuminates the exothermic adsorption mechanism. The increase in standard Gibbs activation free energy (ΔG°) with increasing temperature reveals the process is not spontaneous. As indicated by the negative value of the standard entropy of activation (ΔS°), activation of the reactants resulted in a loss of freedom.

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Section: Resultsmentioning

confidence: 99%

“…Among pH, exposure time, photocatalyst dosage, R195 concentration, and US power as a single variable, each factor with a high mean square and high F-value exerts the greatest influence on the sono-photodegradation of R195. Thus, the effect of variables on R195's degradation is 43 :…”

Section: Resultsmentioning

confidence: 99%

Capability of TiO2 and Fe3O4 nanoparticles loaded onto Algae (Scendesmus sp.) as a novel bio-magnetic photocatalyst to degration of Red195 dye in the sonophotocatalytic treatment process under ultrasonic/UVA irradiation

Zamani,

Rastgar,

Hedayati

2023

Sci Rep

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“…Crosslinks between the molecules of HG-cl-poly(AAm) occur as a result of the crosslinker's reaction with the reactive sites on the graft copolymer. The addition of MBA as a crosslinker to the HG-clpoly(AAm) system results in a more stable and mechanically reliable polymer network by forming covalent connections between the polymer chains [51]. These crosslinking events are greatly facilitated by the reactive or binding sites on the polymer, and the resulting crosslinked structure may affect how the polymer interacts with other substances through adsorption mechanisms.…”

Section: Reaction Mechanism Of the Synthesis Of Hg-cl-poly(aam)mentioning

confidence: 99%

“…Because there are more adsorption sites at higher concentrations of dose, more adsorption sites were available, resulting in an increase in the proportion of dye removal from 85% to 99%, as shown in Figures 9 & 11(a) [64]. Although a higher percentage of removal is observed at an adsorbent dose of 0.6g/L, however, there is no significant improvement in removal when the dose is increased beyond that, possibly due to the saturation occurred due to the occupied binding sites [37,44]. .…”

Section: Effect Of Dose Concentrationmentioning

confidence: 99%

“…Conventional single-parameter optimization overlooks the cumulative interactions between independent variables and is ineffective and time-consuming. RSM, employing mathematical and statistical techniques, illustrates the overall impact of process parameters and optimizes procedures with a minimal number of experimental runs [44,45]. Central composite design (CCD) was used to produce second-order response surface models.…”

Section: Introductionmentioning

confidence: 99%

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Novel Hing gum-based adsorbent with optimized synthesis parameters for cationic dye removal

Gautam,

Kumar

2024

Preprint

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This research investigates the utilization of Hing gum-based hydrogel as an effective adsorbent for the removal of Malachite Green (MG) dye from aqueous solutions. The hydrogel was synthesized using Hing gum as the backbone, acrylamide as the monomer, ammonium persulfate (APS) as an initiator in free radical polymerization, and N, N'-Methylenebisacrylamide (MBA) as a crosslinking agent. Optimization of different reaction parameters was carried out using the Response surface methodology. A full factorial model was utilized to achieve the maximum swelling percentage, and key factors were identified through a Pareto chart. The optimized variables, including the initiator (2.19 ×10− 2 mol L− 1), monomer (8.65 × 10− 1 mol L− 1), and solvent (13 mL), resulted in a maximum percentage swelling of 760%. The significance of the model was confirmed using ANOVA statistics. Various properties were analyzed using Fourier transform infrared spectroscopy, X-ray diffraction, Field emission scanning electron microscopy, thermogravimetric analysis, Zeta Potential, and Brunauer-Emmett-Teller theory. The effectiveness of the prepared hydrogel in MG dye adsorption was evaluated by measuring contact time, pH impact, adsorbent dose, and temperature. The synthesized hydrogel exhibited high efficiency in removing MG dye from aqueous solutions, achieving a noteworthy adsorption rate of approximately 97% over 6 hours at room temperature. Adsorption calculations were described using kinetics and isotherm models. The results indicate that the pseudo-second-order kinetic model and Langmuir isotherm model provided the best fit for the absorption process of MG. The obtained results highlight the adsorbent high absorption capacity and demonstrate its potential as an eco-friendly and cost-effective solution for removing MG dye from water.

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PVA/AMPS hydrogels: Promising adsorbents for wastewater treatment with high efficiency and reusability

Yadav,

Afgan,

Singh

et al. 2024

J of Applied Polymer Sci

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A PVAMPS hydrogel was synthesized through chemical cross‐linking and semi‐interpenetration of Poly (vinyl Alcohol) (PVA) and 2‐Acrylamido‐2‐methyl‐1‐propanesulfonic acid (AMPS) with glutaraldehyde in distilled water. Various ratios of PVA/AMPS, namely PVAMPS‐1 (2:1), PVAMPS‐2 (1:1), and PVAMPS‐3 (1:2), were examined to understand their individual impacts on gel formation. The synthesis of hydrogels was confirmed using FT‐IR and solid‐state 13C NMR spectroscopy. The PVAMPS hydrogels demonstrated high efficiency as a selective adsorbent for removing cationic dyes, such as Methylene Blue, Safranine‐O, and Thionine, from aqueous solutions, with over 90% removal of cationic dyes observed within 18 hours. Regeneration and reusability studies revealed that even after four cycles, the adsorption capacity of the PVAMPS hydrogels remained exceptionally high, with removal rates exceeding 90% for Methylene Blue. However, for Safranine‐O and Thionine, the removal rates dropped to 20% and 23%, respectively, after four cycles. These findings underscore the promising potential of PVAMPS hydrogels for the removal of cationic dyes in wastewater treatment.

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Adsorptive removal of cationic dye by synthesized sustainable xanthan gum-g p(AMPS-co-AAm) hydrogel from aqueous media: Optimization by RSM-CCD model

Cited by 35 publications

References 51 publications

Capability of TiO2 and Fe3O4 nanoparticles loaded onto Algae (Scendesmus sp.) as a novel bio-magnetic photocatalyst to degration of Red195 dye in the sonophotocatalytic treatment process under ultrasonic/UVA irradiation

Capability of TiO2 and Fe3O4 nanoparticles loaded onto Algae (Scendesmus sp.) as a novel bio-magnetic photocatalyst to degration of Red195 dye in the sonophotocatalytic treatment process under ultrasonic/UVA irradiation

Novel Hing gum-based adsorbent with optimized synthesis parameters for cationic dye removal

PVA/AMPS hydrogels: Promising adsorbents for wastewater treatment with high efficiency and reusability

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