Removal of malachite green using carboxymethyl cellulose-g-polyacrylamide/montmorillonite nanocomposite hydrogel

Peighambardoust, Seyed Jamaleddin; Aghamohammadi-Bavil, Omid; Foroutan, Rauf; Arsalani, Nasser

doi:10.1016/j.ijbiomac.2020.05.093

Cited by 152 publications

(45 citation statements)

References 47 publications

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“…16 Hydrogels based on biopolymers such as starch, chitosan, gelatin, agar, pectin, cellulose, and sodium alginate have received special attention due to their low cost, biodegradability, non-toxic nature, and ease of modication. 17,18 Gelatin is a linear hydrophilic ionic polypeptide with amine, carboxylic, and alcohol functional groups, which can be used to modify the biopolymer backbone. This modication process can be performed by graing polymer chains that allow the incorporation of new functional groups into the polymeric network.…”

Section: Introductionmentioning

confidence: 99%

Magnetic methacrylated gelatin-g-polyelectrolyte for methylene blue sorption

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Magnetic methacrylated gelatin-g-polyelectrolyte for methylene blue sorption

et al. 2020

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“…The adsorption degree and internal driving force of adsorbent to adsorbate can be studied by adsorption thermodynamics , Gibbs and Van't Hoff (Seyed et al 2020) as shown in Equations ( 7) and ( 8):…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel

Wang¹,

Zhao²,

Wang³

2021

Water Science and Technology

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Super-absorbent polyaspartic acid/carboxymethyl salix psammophila powder (PASP/CMS) hydrogel was prepared by aqueous solution polymerization. PASP/CMS hydrogel was characterized by FT-IR, XRD, SEM and XPS. The results show that PASP/CMS hydrogel is prepared by graft copolymerization of the -COOH of polyaspartic acid (PASP) and the -CH2OH of carboxymethyl salix psammophila powder (CMS). The surface of that hydrogel becomes dense from loose porosity, and Pb2+ and Cd2+ are adsorbed onto the surface of hydrogel. The crystallinity of CMS is destroyed by the addition of PASP. The initial concentration of Pb2+ and Cd2+, pH, adsorption time and adsorption temperature on the adsorption effect were studied through experiments. And results showed that hydrogel has a good removal effect on Pb(II) and Cd(II) ions. Pseudo-second-order kinetic and Langmuir isotherm models are represented in the process, which are spontaneous, exothermic and decrease of randomness, and it's a single layer chemical adsorption. At the same time, the effect of desorption experimental parameters (HNO3 initial concentration, desorption time, and desorption temperature) on the experiment was studied and optimized.

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“…The AC powder can be immobilized in the hydrogels without dispersing in the water or impeding the adsorption of AC to the dyes. 23 , 24 …”

Section: Introductionmentioning

confidence: 99%

Recycling of Waste Cotton Sheets into Three-Dimensional Biodegradable Carriers for Removal of Methylene Blue

2021

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Waste cotton sheets (WCS) are promising cellulose sources due to their high content of cellulose and large amount of disposal every year, which could be recycled and employed as low-cost structural materials. The present work aims at investigating the efficacy of hydrogel adsorbents prepared from regenerated WCS as the carriers of activated carbon (AC) for treating the dye-contaminated water. Activated WCS was directly dissolved in lithium chloride/ N , N -dimethylacetamide (LiCl/DMAc) solvent and then regenerated into cellulose hydrogels, which were employed as three-dimensional biodegradable matrices for loading an extremely high content of AC (up to 5000%). The morphology and properties of resultant adsorbents were studied in detail. The results showed that different washing methods and contents of AC and cellulose had obvious effects on water contents, mechanical properties, and adsorption capacities of AC/WCS hydrogels. Especially, the hydrogels containing high AC content washed by gradient ethanol solvent exhibited outstanding compressive strengths of up to 3.0 MPa at 60% strain, while the adsorption capacity of 5000%AC/0.3CS toward a model dye methylene blue (MB, initial concentration of 200 mg/L) reached 174.71 mg/g at pH 6.9 and 35 °C. This was comparable to the adsorption capacity of original AC powders, while no AC powders were released from hydrogels to water. The adsorption of MB followed the Dubinin–Astakhov model and pseudo-first-order mechanism. Thermodynamic studies showed the spontaneous and endothermic nature of the overall physical adsorption process. Therefore, this work demonstrates the feasibility to recycle WCS into biodegradable carriers of functional compounds, and the AC/regenerated cellulose hydrogels have a high potential as a promising adsorbent with low-cost and convenient separation for dye removal from wastewater.

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Removal of malachite green using carboxymethyl cellulose-g-polyacrylamide/montmorillonite nanocomposite hydrogel

Cited by 152 publications

References 47 publications

Magnetic methacrylated gelatin-g-polyelectrolyte for methylene blue sorption

Magnetic methacrylated gelatin-g-polyelectrolyte for methylene blue sorption

Adsorption/desorption performance of Pb2+ and Cd2+ with super adsorption capacity of PASP/CMS hydrogel

Recycling of Waste Cotton Sheets into Three-Dimensional Biodegradable Carriers for Removal of Methylene Blue

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