Removal of Cu2+ ions by cellulose nanofibers-assisted starch-g-poly(acrylic acid) superadsorbent hydrogels

Baghbadorani, Nooshin Bahadoran; Behzad, Tayebeh; Etesami, Nasrin; Heidarian, Pejman

doi:10.1016/j.compositesb.2019.107084

Cited by 47 publications

(27 citation statements)

References 53 publications

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“…Obviously, the adsorption capacity decreased sharply at pH 1. This was due to the fact that the functional groups were protonated again under strong acid conditions, which hindered the interaction between the hydrogel and cations [ 44 ]. Under weakly acidic conditions, the adsorption capacity of the hydrogel can still be maintained at a relatively high level.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

et al. 2021

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In order to avoid the secondary pollution of the toxic residue of chemical crosslinking agent accompanied by chemical hydrogel adsorbent and enhance the adsorption performance of physical hydrogel, chitosan/calcium alginate/bentonite (CTS/CA/BT) composite physical hydrogel was constructed. The formation mechanism and structure of the composite hydrogel were determined by FTIR, XRD and SEM. Adsorption performances of the hydrogel toward Pb2+, Cu2+ and Cd2+ in water under different condition as well as multi-ion competitive sorption were investigated. The adsorption processes were described with the canonical adsorption kinetics and isotherms models. With the utilization of XPS analysis and adsorption thermodynamics analysis, it was found that the adsorptions were spontaneous physico-chemical adsorptions. The results showed that the maximum adsorption capacity of the hydrogel for Pb2+, Cu2+ and Cd2+ reached up to 434.89, 115.30 and 102.38 mg·g−1, respectively, better than those of other physical hydrogels or chitosan/bentonite composite. Moreover, the composite hydrogel improved the collectability of bentonite and showed a good reusability. The modification of bentonite and the formation of hydrogel were completed simultaneously, which greatly simplifies the operation process compared with the prior similar works. These suggest that the CTS/CA/BT composite hydrogel has promising application prospects for removal of heavy metal ions from water.

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Section: Resultsmentioning

confidence: 99%

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

et al. 2021

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“…Cellulose nanofibers (CNFs) can be used as adsorbent material. Baghbadorani et al [ 15 ] treated cellulose nanofibers on starch-g-poly(acrylic acid) (St-g-PAA) for Cu 2+ elimination in an aqueous medium. This composite improved the adsorption of ions in the study.…”

Section: Starchmentioning

confidence: 99%

“…Meanwhile, when starch is treated with kaolin at high temperature, a starch with improved biodegradability properties is obtained [ 2 ]. Some of their applications are encapsulating agent [ 7 , 8 , 9 ], bio-adsorbent [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ], foams [ 19 , 20 , 21 , 22 , 23 , 24 ], food packaging [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ], and medical applications [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ] ( Figure 3 ).…”

Section: Introductionmentioning

confidence: 99%

Two Fascinating Polysaccharides: Chitosan and Starch. Some Prominent Characterizations for Applying as Eco-Friendly Food Packaging and Pollutant Remover in Aqueous Medium. Progress in Recent Years: A Review

2021

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The call to use biodegradable, eco-friendly materials is urgent. The use of biopolymers as a replacement for the classic petroleum-based materials is increasing. Chitosan and starch have been widely studied with this purpose: to be part of this replacement. The importance of proper physical characterization of these biopolymers is essential for the intended application. This review focuses on characterizations of chitosan and starch, approximately from 2017 to date, in one of their most-used applications: food packaging for chitosan and as an adsorbent agent of pollutants in aqueous medium for starch.

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“…As an example, starch in particular, is an inexpensive and readily-available polysaccharide with branched (amylopectin) and linear (amylose) polymeric forms [ 1 , 13 ]. However, its brittleness and moisture-sensitivity render it difficult to employ in load-bearing applications [ 3 , 12 , 14 , 15 ], while its lack of electroconductivity makes it equally difficult for use in soft wearable strain sensors [ 16 , 17 ]. Found in the exoskeleton of arthropods and synthesized linearly by glucosamine monomers with β-(1-4)- N -acetyl glucosamine linkages, chitin nanofibers (ChNF) is the second most abundant polysaccharide in nature and contains highly crystallized fibrous structures with diameters usually between 2–20 nm [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

Heidarian

Yousefi

Kaynak

et al. 2021

Sensors

Self Cite

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Electroconductive hydrogels with stimuli-free self-healing and self-recovery (SELF) properties and high mechanical strength for wearable strain sensors is an area of intensive research activity at the moment. Most electroconductive hydrogels, however, consist of static bonds for mechanical strength and dynamic bonds for SELF performance, presenting a challenge to improve both properties into one single hydrogel. An alternative strategy to successfully incorporate both properties into one system is via the use of stiff or rigid, yet dynamic nano-materials. In this work, a nano-hybrid modifier derived from nano-chitin coated with ferric ions and tannic acid (TA/Fe@ChNFs) is blended into a starch/polyvinyl alcohol/polyacrylic acid (St/PVA/PAA) hydrogel. It is hypothesized that the TA/Fe@ChNFs nanohybrid imparts both mechanical strength and stimuli-free SELF properties to the hydrogel via dynamic catecholato-metal coordination bonds. Additionally, the catechol groups of TA provide mussel-inspired adhesion properties to the hydrogel. Due to its electroconductivity, toughness, stimuli-free SELF properties, and self-adhesiveness, a prototype soft wearable strain sensor is created using this hydrogel and subsequently tested.

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Removal of Cu2+ ions by cellulose nanofibers-assisted starch-g-poly(acrylic acid) superadsorbent hydrogels

Cited by 47 publications

References 53 publications

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

Two Fascinating Polysaccharides: Chitosan and Starch. Some Prominent Characterizations for Applying as Eco-Friendly Food Packaging and Pollutant Remover in Aqueous Medium. Progress in Recent Years: A Review

Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

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