Synthesis and characterization of graft copolymers of chitosan with NIPAM and binary monomers for removal of Cr(VI), Cu(II) and Fe(II) metal ions from aqueous solutions

Lalita, .; Singh, Anirudh P.; Sharma, Rajeev Kr.

doi:10.1016/j.ijbiomac.2017.02.091

Cited by 59 publications

(8 citation statements)

References 49 publications

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“…In patterns of hydrogels, there were no sharp peaks of AT-CNTs observed in formed hydrogels due to the hydrogen bonding among the functional groups of AT-CNTs and other functional groups of MAX and PNIPAM during the formation of the hydrogel [ 39 ]. This also showed that AT-CNTs changed from crystalline to amorphous due to the formation [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotubes Reinforced Maleic Anhydride-Modified Xylan-g-Poly(N-isopropylacrylamide) Hydrogel with Multifunctional Properties

et al. 2018

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Introducing multifunctional groups and inorganic material imparts xylan-based hydrogels with excellent properties, such as responsiveness to pH, temperature, light, and external magnetic field. In this work, a composite hydrogel was synthesized by introducing acid treated carbon nanotubes (AT-CNTs) into the maleic anhydride modified xylan grafted with poly(N-isopropylacrylamide) (MAX-g-PNIPAM) hydrogels network. It was found that the addition of AT-CNTs affected the MAX-g-PNIPAM hydrogel structure, the swelling ratio and mechanical properties, and imparted the hydrogel with new properties of electrical conductivity and near infrared region (NIR) photothermal conversion. AT-CNTs could reinforce the mechanical properties of MAX-g-PNIPAM hydrogels, being up to 83 kPa for the compressive strength when the amount was 11 wt %, which was eight times than that of PNIPAM hydrogel and four times than that of MAX-g-PNIPAM hydrogel. The electroconductibility was enhanced by the increase of AT-CNTs amounts. Meanwhile, the composite hydrogel also exhibited multiple shape memory and NIR photothermal conversion properties, and water temperature was increased from 26 °C to 56 °C within 8 min under the NIR irradiation. Thus, the AT-CNTs reinforced MAX-g-PNIPAM hydrogel possessed promising multifunctional properties, which offered many potential applications in the fields of biosensors, thermal-arrest technology, and drug-controlled release.

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Section: Resultsmentioning

confidence: 99%

Carbon Nanotubes Reinforced Maleic Anhydride-Modified Xylan-g-Poly(N-isopropylacrylamide) Hydrogel with Multifunctional Properties

et al. 2018

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“…• disposed of materials are incorporated rapidly once more into the creation cycle • waste material can be easily removed directly from the products • polymers after primary process can perform under high temperatures very effectively • after primary recycling the final product can work same as properties of the fresh product The best example of the primary mechanical recycling process is the recycling of the Television back covers which comprised of mixes of polycarbonate with acrylonitrile butadiene styrene with phosphor-based fire retardants were changed over into fresh back covers of the television [10].…”

Section: Thermoplastics Primary Mechanical Recyclingmentioning

confidence: 99%

Processing and Recycling of thermoplastic polymers: Current Scenario and Future Challenges

Singh¹

2021

TURCOMAT

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Thermoplastic polymers are extensively utilized in electronics, aerospace, automobile and additive manufacturing industries due to low cost, low temperature processing and reusability. Thermoplastics of different grades and chemical structures arereadily available in the market They can be reusedand reshaped, and also can be manufactured with less weight proportion as compared to the metals and ceramics by providing same strength of material. As a result, the plastics products in the market are getting popular day by day with high demand of customized products due to inception of additive manufacturing technologies. In any case, the issue of recycling these materials is challenge due to enormous energy requirements and varying chemical composition of different polymers. There are both mechanical and financial issues that restrict the advancements in this field. The recycling process of polymers can be done by the four different ways such as primary recycling process, secondary recycling process, tertiary recycling process and quaternary recycling process which can be discussed in this systematic review with practical examples. The modifications and implementation of these polymer waste recycling techniques could help to reduce wastage and save material cost which would directly affect the economy of contemporary industries.

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“…At lower pH, hydrogen ions occupy most of the adsorption sites of the adsorbent and this leads to a very low adsorption due to electrostatic repulsion. Lalita et al was grafted chitosan with Nisopropylacrylamide with the presence of azoisobutrylnitrile (AIBN) as an initiator [54]. Chitosan and the graft copolymer were characterized by different techniques such as by FTIR, TGA/DTA, XRD and SEM.…”

Section: Grafting Of Chitosanmentioning

confidence: 99%

Chitosan-Based Adsorbents for the Removal of Metal Ions From Aqueous Solutions

Sutirman¹,

Sanagi²,

Karim³

et al. 2018

MJAS

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Wastewater containing heavy metal ions is one of the most serious environmental concerns. Exposure to elevated levels of heavy metals can adversely affect water resources, endangering the ecosystems and human health. Among the various treatment technologies, adsorption using biopolymer seems a promising alternative method. Chitosan is a natural polymer produced from chitin with excellent properties such as biocompatibility, biodegradability and non-toxicity. Moreover, chitosan is known as an effective sorbent due to the presence of amino and hydroxyl groups in its molecules which can serve as attachment sites towards metal ions. Recently, chitosan derivatives as metal ion sorbents have gained considerable attention. These derivatives are prepared by either physical or chemical modifications or both in order to improve chitosan properties in adsorption. This paper discusses recent developments in the modifications of chitosan and the application of the derived materials in the removal of metal ions from aqueous solutions. The mechanisms of adsorption, metal sorption capacities, effect of pH, isotherm and kinetic models are also described.

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Synthesis and characterization of graft copolymers of chitosan with NIPAM and binary monomers for removal of Cr(VI), Cu(II) and Fe(II) metal ions from aqueous solutions

Cited by 59 publications

References 49 publications

Carbon Nanotubes Reinforced Maleic Anhydride-Modified Xylan-g-Poly(N-isopropylacrylamide) Hydrogel with Multifunctional Properties

Carbon Nanotubes Reinforced Maleic Anhydride-Modified Xylan-g-Poly(N-isopropylacrylamide) Hydrogel with Multifunctional Properties

Processing and Recycling of thermoplastic polymers: Current Scenario and Future Challenges

Chitosan-Based Adsorbents for the Removal of Metal Ions From Aqueous Solutions

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