Removal of copper using novel amidoxime based chelating nanohybrid adsorbent

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Polyaniline (PANI) grafted conducting nanohybrids are successfully synthesized by emulsion graft polymerization. Maximum grafting of 644% is obtained on sepiolite at optimized concentrations and reaction conditions. The Fourier transform infrared (FT‐IR) spectra of sepiolite grafted polyaniline (MS‐g‐PANI) nanohybrid revealed the presence of stretching vibrations of C=C bonds of polyaniline at 1580 and 1490 cm−1 along with the characteristic peaks of sepiolite. Increased thermal stability of the nanohybrid is observed with the increase in polyaniline grafting. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to study the structural changes caused by grafting. A progressive increase in electrical conductivity is observed with the increase in grafting yield. Maximum electrical conductivity of 0.427 Scm−1 is observed in the nanohybrid having 644% grafting. 24.2 dB (>99% attenuation) EMI shielding effectiveness has been exhibited by the developed nanohybrids in X‐band frequency range.

mentioning

confidence: 85%

Synthesis and EMI shielding studies of polyaniline grafted conducting nanohybrid

Raza

Nasir

Tahir

et al. 2020

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“…It is an ecofriendly technology, which requires no chemical initiators, minimizes additives, and uses catalysts with zero activation energy for the initiation of free‐radical processes. Various kinds of polymeric adsorbents and ion‐exchange resins for the separation and preconcentration of heavy metals from industrial wastewaters have been produced with radiation grafting . Previous studies have demonstrated the radiation grafting of styrene (St) monomer onto different polymers, including PP, polyethylene, and Teflon, to prepare precursor polymers; these were subsequently activated by sulfonation into strongly acidic cation‐exchange resins having SO 3 H groups .…”

Section: Introductionmentioning

confidence: 99%

Surface modification of polypropylene waste by the radiation grafting of styrene and upcycling into a cation‐exchange resin

Hassan

Taimur

Khan

et al. 2018

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In this study, we radiation‐grafted polypropylene waste (PPw) powder obtained from the accelerated aging of pristine polypropylene with styrene (St) using γ rays from a Co‐60 source at dose rate of 4.78 kGy/h. The influence of the variation of the γ absorbed dose, solvent types, and monomer concentration on the grafting yield was investigated. Solution grafting in methanol resulted in a higher grafting yield of 162.6% at 30 kGy in contrast to the 69.5% obtained in the absence of solvent. Grafting was found to be enhanced with the increased dilution of St with methanol. The grafted St units were incorporated with sulfonic (SO3H) groups by a sulfonation reaction with sulfuric acid. Fourier transform infrared spectroscopy, X‐ray diffraction spectrometry, scanning electron microscopy/energy‐dispersive X‐ray spectroscopy, and thermogravimetric analysis were used to characterize the grafted and sulfonated products. Sulfonation of 162.6% grafted PPw powder exhibited a maximum ion‐exchange capacity (IEC) of 3.56 mequiv/g. The utilization of PPw and its conversion into sulfonated PPw with comparable IECs is a new addition to already existing radiation grafting systems. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47145.

“…With a AN/St/DVB = 4/4/2 ratio. In this spectrum, the characteristic vibration absorption band of the nitrile groups, C ≡ N, from AN appears at 2234 cm −1 . The absorption band of C=C at 3027 cm −1 shows there were still unreacted, unsaturated double bonds in the terpolymer.…”

Section: Resultsmentioning

confidence: 94%

“…Among them, the amidoxime reaction is the use of a nucleophilic addition reaction of a cyano group and a hydroxylamine reagent to obtain a compound having an amidoxime group. These kinds of porous spherical resins could be used as the precursors of the amidoxime resin which have been adopted in the field of dissipated metal recycling …”

Section: Introductionmentioning

confidence: 99%

Influence of solubility parameter difference between monomer and porogen on structures of poly (acrylonitrile–styrene‐divinylbenzene) resins

Cai

Peng

Liang

et al. 2018

In this work, the acrylonitrile (AN)-styrene (St)-divinylbenzene (DVB) resin was synthesized via suspension polymerization in the presence of inert porogens as diluent. The relationship of the solubility parameter (SP) of the materials and the porous properties of the resin was investigated. These porous spherical resin particles (0.25-0.84 mm) can be used as precursors of amidoxime resin which has a high metal ion chelating efficiency. The results showed that the porous properties (surface area and mean pore width) of the resin changed with variation in the compatibility between monomers and porogens. According to the the BET theory to N 2 sorption and scanning electron microscopy (SEM), the specific surface area of the obtained beads was strongly dependent on the compatibility of the components of the system and achieved values from 3.3 to 66.8 m 2 /g. The surface area of the terpolymer beads was found to rise with a decrease in the content of acrylonitrile or an increase in the SP of the porogens. However, the variation of the pore size was just the opposite.