Adsorption of Cr(VI) using silica-based adsorbent prepared by radiation-induced grafting

Qiu, Jingjiang; Wang, Ziyue; Li, Huibo; Xu, Ling; Peng, Jing; Zhai, Maolin; Yang, Changchun; Li, Jiuqiang; Wei, Genshuan

doi:10.1016/j.jhazmat.2008.11.053

Cited by 100 publications

(45 citation statements)

References 47 publications

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“…to work optimally (45,46) Radiation grafting Free radical/ionic Generation of radicals/ions by gamma radiation (11,47) Direct radical/ion generation eliminates the need of initiators and washout steps (48) Serious degradation and/or decomposition of the polymer can occur (49)(50)(51) the molecule capable of triggering a reaction (34). The reaction that eventuates is the transfer of this high energy radical to a substrate polymer that can subsequently react with monomer composites to effect a modification on the polymer surface presenting a grafted product (32).…”

Section: Photo-initiated Graftingmentioning

confidence: 99%

“…These high energy sites/radicals on a polymer backbone can then react with monomer to synthesize a grafted chain polymer in the same manner as explained before (11,47,48). This process is extremely resourceful as it eliminates the requirement for initiator chemicals thereby excluding further contamination, has a Fig.…”

Section: Radiation Graftingmentioning

confidence: 99%

“…The irradiation of macromolecules can cause homolytic fission generating free radicals on the polymer itself (48). This is the only grafting process where an initiator is not imperative (48).…”

Section: Free Radical Grafting Via a Radiation Approachmentioning

confidence: 99%

“…This is the only grafting process where an initiator is not imperative (48). However, the medium in which this technique is carried out is important (48,49). If irradiation is carried out in air, then peroxides maybe formed on the polymer due to oxygen in the atmosphere (49).…”

Section: Free Radical Grafting Via a Radiation Approachmentioning

confidence: 99%

“…Grafting is feasible in three different ways, namely (a) pre-irradiation, (b) peroxidation, and (c) mutual irradiation approach. In the pre-irradiation approach, the parent polymer is irradiated in a vacuum or under an inert atmosphere such as nitrogen to generate free radicals (48,49,75). The irradiated polymer is then amalgamated with the monomer as a liquid, solution in solvent, or gas state to initiate grafting (48,49,75).…”

Section: Free Radical Grafting Via a Radiation Approachmentioning

confidence: 99%

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A Review of Polymeric Refabrication Techniques to Modify Polymer Properties for Biomedical and Drug Delivery Applications

et al. 2013

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Abstract. Polymers are extensively used in the pharmaceutical and medical field because of their unique and phenomenal properties that they display. They are capable of demonstrating drug delivery properties that are smart and novel, such properties that are not achievable by employing the conventional excipients. Appropriately, polymeric refabrication remains at the forefront of process technology development in an endeavor to produce more useful pharmaceutical and medical products because of the multitudes of smart properties that can be attained through the alteration of polymers. Small alterations to a polymer by either addition, subtraction, self-reaction, or cross reaction with other entities have the capability of generating polymers with properties that are at the level to enable the creation of novel pharmaceutical and medical products. Properties such as stimuli-responsiveness, site targeting, and chronotherapeutics are no longer figures of imaginations but have become a reality through utilizing processes of polymer refabrication. This article has sought to review the different techniques that have been employed in polymeric refabrication to produce superior products in the pharmaceutical and medical disciplines. Techniques such as grafting, blending, interpenetrating polymers networks, and synthesis of polymer complexes will be viewed from a pharmaceutical and medical perspective along with their synthetic process required to attain these products. In addition to this, each process will be evaluated according to its salient features, impeding features, and the role they play in improving current medical devices and procedures.

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Section: Photo-initiated Graftingmentioning

confidence: 99%

Section: Radiation Graftingmentioning

confidence: 99%

Section: Free Radical Grafting Via a Radiation Approachmentioning

confidence: 99%

Section: Free Radical Grafting Via a Radiation Approachmentioning

confidence: 99%

Section: Free Radical Grafting Via a Radiation Approachmentioning

confidence: 99%

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A Review of Polymeric Refabrication Techniques to Modify Polymer Properties for Biomedical and Drug Delivery Applications

et al. 2013

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Rapid removal of Cr(VI) ions from aqueous solutions by the macroporous poly(N, N′‐dimethylamino ethyl methacrylate) hydrogels

Zhu

Song

et al. 2012

J of Applied Polymer Sci

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To improve the adsorption ability of hexavalent chromium [Cr(VI)], the macroporous poly(N, N 0 -dimethylamino ethyl methacrylate) [poly(DMAEMA)] hydrogels were successfully fabricated by free-radical copolymerization in ethanol/water mixture using N, N 0 -dimethylamino ethyl methacrylate (DMAEMA) as the monomer, N, N 0 -methylenebisacrylamide (MBAA) as the crosslinker, and Na 2 SO 4 solution as the porogen. The effects of various parameters, such as the concentration of Na 2 SO 4 solutions, the dosage of MBAA, pH values, adsorption kinetic, and isotherm curves, were all investigated through systematic experiments. Scanning electron microscope (SEM) was employed to characterize the various pore structures. The experimental results showed that the influence of Na 2 SO 4 solution to the pore morphology in the matrix was significant. The poly(DMAEMA) hydrogels can effectively adsorb Cr(VI) ions in aqueous media, and the macroporous structures could obvious improve the response rate and adsorption capacity. These results prove that the macroporous poly(DMAEMA) gels can be treated as a potential material for environmental pollution control.

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Cover Picture: Structure‐Dependent Electrocatalysis of Ni(OH)₂ Hourglass‐like Nanostructures Towards L‐Histidine (Chem. Eur. J. 2/2013)

Nai

Chen

et al. 2013

Chemistry A European J

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Hourglass‐like Ni(OH)2 nanostructures were selected to serve as electrode modifiers to demonstrate the correlation between the structure of nanomaterials and their electrocatalytic activity on L‐histidine. All three types of Ni(OH)2 nanostructure‐modified electrodes have a lower detection limit and wider linear range than the commercial materials. The electrocatalytic activity of these unique nanostructures was found to not only depend on their external architecture, but also on their relevant internal degree of crystallinity. These findings may enable the design of new and better electrocatalytic materials by using shape‐controlled nanoparticles. For more details see the Full Paper by Li and Guo et al. on

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Adsorption of Cr(VI) using silica-based adsorbent prepared by radiation-induced grafting

Cited by 100 publications

References 47 publications

A Review of Polymeric Refabrication Techniques to Modify Polymer Properties for Biomedical and Drug Delivery Applications

A Review of Polymeric Refabrication Techniques to Modify Polymer Properties for Biomedical and Drug Delivery Applications

Rapid removal of Cr(VI) ions from aqueous solutions by the macroporous poly(N, N′‐dimethylamino ethyl methacrylate) hydrogels

Cover Picture: Structure‐Dependent Electrocatalysis of Ni(OH)₂ Hourglass‐like Nanostructures Towards L‐Histidine (Chem. Eur. J. 2/2013)

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Adsorption of Cr(VI) using silica-based adsorbent prepared by radiation-induced grafting

Cited by 100 publications

References 47 publications

A Review of Polymeric Refabrication Techniques to Modify Polymer Properties for Biomedical and Drug Delivery Applications

A Review of Polymeric Refabrication Techniques to Modify Polymer Properties for Biomedical and Drug Delivery Applications

Rapid removal of Cr(VI) ions from aqueous solutions by the macroporous poly(N, N′‐dimethylamino ethyl methacrylate) hydrogels

Cover Picture: Structure‐Dependent Electrocatalysis of Ni(OH)2 Hourglass‐like Nanostructures Towards L‐Histidine (Chem. Eur. J. 2/2013)

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Product

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About

Cover Picture: Structure‐Dependent Electrocatalysis of Ni(OH)₂ Hourglass‐like Nanostructures Towards L‐Histidine (Chem. Eur. J. 2/2013)