Adsorptive removal of multi-azo dye from aqueous phase using a semi-IPN superabsorbent chitosan-starch hydrogel

Ngwabebhoh, Fahanwi Asabuwa; Gazi, Mustafa; Oladipo, Akeem Adeyemi

doi:10.1016/j.cherd.2016.06.023

Cited by 139 publications

(62 citation statements)

References 49 publications

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“…A paper by Ngwabebhoh et al . reports the efficient removal of Direct Red 80 (DR80) dye from an aqueous phase using a semi‐interpenetrating network (IPN) superabsorbent chitosan − starch (ChS) hydrogel (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Chitosan adsorbents for dye removal: a review

2017

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One of the most important decontamination techniques is considered to be adsorption. It is fast, simple, low cost with many opportunities to modify the initial materials after appropriate synthesis routes etc. Numerous adsorbent materials have been prepared in the last few years having as the ultimate scope to remove some pollutants especially from contaminated waters (effluents originating from industry). But the composition of each type of effluent varies. Dyes are some major components of industrial wastewaters. Chitosan (poly--(1 → 4)-2-amino-2-deoxy-D-glucose) is a nitrogenous (amino-based) polysaccharide which is produced in large quantities by N-deacetylation of (its source compound) chitin. The major advantage of chitosan is the existence of modifiable positions in its chemical structure. Modification of the chitosan molecule by (i) grafting (inserting functional groups) or (ii) crosslinking reactions (uniting the macromolecular chains with each other) leads to the formation of chitosan derivatives with superior properties (enhancement of adsorption capacity and resistance in extreme medium conditions, respectively). This review summarizes the important contribution of chitosan derivatives to the dye removal process by adsorption.

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Section: Discussionmentioning

confidence: 99%

“…Depiction of semi‐interpenetrating network chitosan − starch hydrogel formation and crosslinking reaction. Reprinted with permission from Elsevier …”

Section: Discussionmentioning

confidence: 99%

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Chitosan adsorbents for dye removal: a review

2017

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“…Pseudo-first-and second-order kinetic models 40 were used to investigate the adsorption mechanism and possible velocity control step. where q t is the adsorption capacity at time t; q e is the equilibrium adsorption capacity; and k 1 is the pseudo-firstorder rate constant of the equation.…”

Section: Adsorption Kinetics Studymentioning

confidence: 99%

Optimization of the removal of reactive golden yellow SNE dye by cross-linked cationic starch and its adsorption properties

Guo

Wang

Zheng

et al. 2019

Journal of Engineered Fibers and Fabrics

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In this study, cross-linked cationic starch was synthesized with corn starch as a raw material, epichlorohydrin as a cross-linked agent, and 3-chloro-2-hydroxypropyl trimethylammonium chloride as a cationic etherification agent, respectively, and it was characterized by X-ray photoelectron spectroscopy, X-ray powder diffraction, scanning electron microscopy, and thermogravimetry. The X-ray photoelectron spectroscopy results showed that cationic N appeared on the surface of cross-linked cationic starch; that is, a quaternary ammonium group was introduced. The X-ray powder diffraction results indicated that although the crystallinity of cross-linked cationic starch was lower than that of corn starch, cross-linked cationic starch still had an A-type crystal structure. The scanning electron microscopy results demonstrated that cross-linked cationic starch maintained a granular structure with small holes on the surface. Finally, the thermogravimetric results illustrated that the thermal stability of cross-linked cationic starch decreased. Before the adsorption experiment, the pHpzc of cross-linked cationic starch was obtained by the pH drift method, and it was 6.8. The optimal removal rate of reactive golden yellow SNE dye obtained by response surface methodology was 99.59%, and the optimal adsorption time, temperature, concentration of dye, and cross-linked cationic starch dosage were 14.3 min, 39°C, 100 mg/L, and 0.7 g/L, respectively. The adsorption of SNE by cross-linked cationic starch conformed to pseudo-second-order kinetics and the Langmuir isothermal adsorption model. The equilibrium adsorption capacity from pseudo-second-order kinetics and the maximum adsorption capacity from Langmuir isotherm model were 123.76 and 208.77 mg/g at 308.15 K, separately. In addition, this adsorption was an endothermic process.

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“…Superabsorbent resins with moderately crosslinked 3D hydrophilic network polymers which can absorb and conserve a large amount of water, saline solutions, or physiological solutions even under the conditions of certain heat or pressure . Superabsorbents, which possess special properties superior to conventional absorbents, have extensively been applied into agriculture , medical materials , hygiene products, baby diapers, waste water treatment , and soil for agriculture and horticulture . Most of the traditional water absorbing resins, however, have the disadvantages of high price and low water absorption capacities.…”

Section: Introductionmentioning

confidence: 99%

Construction and water absorption capacity of a 3D network‐structure starch‐g‐poly(sodium acrylate)/PVP Semi‐Interpenetrating‐Network superabsorbent resin

et al. 2017

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A new semi‐interpenetrating network superabsorbent resin (semi‐IPN SAR), starch‐g‐poly (sodium acrylate)/PVP, with a three‐dimensional (3D) network structure constructed from a starch‐g‐poly(sodium acrylate) (starch‐g‐PNaA) network and linear poly(vinylpyrrololidone) (PVP) was synthesized by a free‐radical solution polymerization method in the presence of initiator ammonium persulfate (APS) and crosslinker N,N′‐methylene‐bis‐acrylamide (MBA). The synthesis conditions were systematically investigated. The optimum synthesis mass ratio of PVP, starch, APS, and MBA to AA was 20, 30, 1.25, and 0.15%, respectively, the neutralization degree of acrylic acid was 80%, and the reaction temperature was 60°C. Furthermore, the semi‐IPN SAR was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and three‐dimensional X‐ray diffraction microscopy (3D‐XRDM). FTIR and TGA results agreed that PNaA had been grafted onto the starch macromolecular chains and the starch‐g‐PNaA network was penetrated by linear PVP polymers by a hydrogen binding action. Moreover, the surface morphology of the resin exhibited apparent wrinkling due to the introduction of PVP. The 3D‐XRDM result further proved that the resin was provided with a three‐dimensional network structure. The introduction of PVP and the formation of the semi‐IPN structure greatly enhanced the water absorbency of the resin. The water and saline absorbency of the optimized material was improved to 2017.8 g/g distilled water and 89.7 g/g NaCl aqueous solution (0.9 wt%), respectively. Furthermore, kinetic analysis agreed that the pseudo‐second‐order kinetic model was fitted to describe a whole adsorption process, which indicated the adsorption process was not controlled by diffusion steps.

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Adsorptive removal of multi-azo dye from aqueous phase using a semi-IPN superabsorbent chitosan-starch hydrogel

Cited by 139 publications

References 49 publications

Chitosan adsorbents for dye removal: a review

Chitosan adsorbents for dye removal: a review

Optimization of the removal of reactive golden yellow SNE dye by cross-linked cationic starch and its adsorption properties

Construction and water absorption capacity of a 3D network‐structure starch‐g‐poly(sodium acrylate)/PVP Semi‐Interpenetrating‐Network superabsorbent resin

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