Recycling of reactive dye using semi‐interpenetrating polymer network from sodium alginate and isopropyl acrylamide

Dhanapal, V.; Subramanian, K.

doi:10.1002/app.40968

Cited by 14 publications

(4 citation statements)

References 55 publications

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“…The maximum water contents of Figure 1 were taken as equilibrium values to calculate Δ m 1 ,∞ . The representation of all the Δ m 1 ,t /Δ m 1 ,∞ vs. t 1 / 2 /l plots showed a non-Fickian sorption mechanism [51] in these alginate hydrogels with and without CNFs, which is in good agreement with earlier studies carried out with liquid and vapour water in alginate-based hydrogels [52,53,54,55] and in alginate composites hydrogels with other carbon materials [21,56]. However, an apparent diffusion coefficient can be determining by linear regression fitting of Equation (1) for low values of time t or Δ m 1 ,t /Δ m 1 ,∞ < 0.5 to compare liquid water diffusion behaviour in all these similar polymeric systems.…”

Section: Resultssupporting

confidence: 89%

Low-Cost Advanced Hydrogels of Calcium Alginate/Carbon Nanofibers with Enhanced Water Diffusion and Compression Properties

Llorens-Gámez

Serrano‐Aroca

2018

Polymers

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A series of alginate films was synthesised with several calcium chloride cross-linker contents (from 3 to 18% w/w) with and without a very low amount (0.1% w/w) of carbon nanofibers (CNFs) in order to reduce the production costs as much as possible. The results of this study showed a very significant enhancement of liquid water diffusion and mechanical compressive modulus for high calcium chloride contents when this minuscule amount of CNFs is incorporated into calcium alginate hydrogels. These excellent results are attributed to a double cross-linking process, in which calcium cations are capable of cross-linking both alginate chains and CNFs creating a reinforced structure exhibiting ultrafast water diffusion through carbon nanochannels. Thus, these excellent results render these new alginate composites very promising for many bioengineering fields in need of low-cost advanced hydrogels with superior water diffusion and compression properties.

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Section: Resultssupporting

confidence: 89%

Low-Cost Advanced Hydrogels of Calcium Alginate/Carbon Nanofibers with Enhanced Water Diffusion and Compression Properties

Llorens-Gámez

Serrano‐Aroca

2018

Polymers

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“…Starch‐g‐PAA SAPs exhibit three main decomposition stages as temperature increases from 50 to 800°C. At the first stage, about 12.2 and 14.9% weight loss is observed at 243–326°C and 229–327°C for amylose‐g‐PAA and amylopectin‐g‐PAA, respectively, which can be attributed to the decomposition of amylose and amylopectin including the dehydration of saccharide rings, chain scission eliminating CO and CO 2 , and splitting of the starch structure . The weight losses in the second stage at 327–414°C (8.6 and 10.2%) and the third stage at 414–536°C (23.4 and 23.4%) are associated with the degradation of grafted PAA chains in amylose‐g‐PAA or amylopectin‐g‐PAA copolymers.…”

Section: Resultsmentioning

confidence: 99%

Effects of chain structures of corn starches on starch‐based superabsorbent polymers

Zhang

Cui

2015

Starch Stärke

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Biodegradable superabsorbent polymers (SAPs) were synthesized in this study by graft copolymerization of monomers (acrylic acid or acrylamide) onto amylose and amylopectin, respectively, using potassium persulfate as an initiator and N,N 0 -methylenebisacrylamide as a cross-linker. The main purpose of this study is to investigate the effects of the chain structures of corn starches on the grafting ratio (GR) and physicochemical properties of starch-based SAPs including starch-graft-polyacrylic acid and starch-graft-polyacrylamide SAPs. The structure of these SAPs was characterized by FTIR, 13 C nuclear magnetic resonance ( 13 C-NMR), and thermogravimetric analysis (TGA), and the GR was evaluated by acid hydrolysis. We also investigated their swelling kinetics and reswelling capacity. The results show that the water absorption capacity and GR of amylose graft copolymers are superior to those of amylopectin graft copolymers; this may be due to the differences in structures and physicochemical properties between amylose and amylopectin.

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“…However, the applications of hydrogel-based heavy -metal adsorbents are limited by their poor mechanical strengths. , Many reports show that the mechanical strengths of hydrogels can be enhanced by introducing an optimum amount of natural clay into the semi-interpenetrating polymer network (semi-IPN) hydrogels. , In recent years, such ternary composite hydrogels, which consist of natural linear polymers, synthetic polymer monomers, and inorganic clay, are becoming a popular system. , …”

Section: Introductionmentioning

confidence: 99%

Mechanistic Understanding of the Adsorption Behavior of Metal Lead Ions by Attapulgite-Induced Porous Nanocomposite Hydrogels

2018

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Hydrogels have many advantages as a kind of heavy-metal adsorbent, such as simple separation, high efficiency, and recyclability, but their applications are limited by their poor mechanical strengths. To this end, versatile natural phyllosilicate minerals are introduced into hydrogels to enhance the mechanical strengths of hydrogels. However, mechanistically understanding the clay-induced effect is still limited. In this work, attapulgite-induced porous network structures were observed, which are interpreted in terms of the nonsacrificial starch-like pore formation mechanism. Furthermore, the influence of the porous structure of the attapulgite nanocomposite hydrogels on the adsorption of Pb 2+ from an aqueous solution was comprehensively studied. The adsorption kinetics fits a pseudo-second kinetic model well, and the syllogistic Weber−Morris model study reveals that the porous structures of nanocomposite hydrogels improves their ability to internally diffuse. The adsorption isotherm displays over 98.2% of goodness of fit for the Langmuir isothermal model, with a maximum adsorption capacity of 864.5 mg/g for the adsorption of Pb 2+ . Moreover, the adsorption thermodynamics study indicates that the enthalpy changes of chemical adsorption decrease from 62.31 to 51.01 kJ/mol for hydrogels after the addition of 10% attapulgite. On the basis of the above findings, a reasonable adsorption mechanism including surface adsorption and internal diffusion is proposed.

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Recycling of reactive dye using semi‐interpenetrating polymer network from sodium alginate and isopropyl acrylamide

Cited by 14 publications

References 55 publications

Low-Cost Advanced Hydrogels of Calcium Alginate/Carbon Nanofibers with Enhanced Water Diffusion and Compression Properties

Low-Cost Advanced Hydrogels of Calcium Alginate/Carbon Nanofibers with Enhanced Water Diffusion and Compression Properties

Effects of chain structures of corn starches on starch‐based superabsorbent polymers

Mechanistic Understanding of the Adsorption Behavior of Metal Lead Ions by Attapulgite-Induced Porous Nanocomposite Hydrogels

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