Adsorption behaviors of Hg(II) on chitosan functionalized by amino-terminated hyperbranched polyamidoamine polymers

Ma, Fang; Qu, Rongjun; Sun, Changmei; Wang, Chunhua; Ji, Chunnuan; Zhang, Ying; Yin, Ping

doi:10.1016/j.jhazmat.2009.07.066

Cited by 114 publications

(52 citation statements)

References 26 publications

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“…The solution is kept under continuous agitation with a magnetic stirrer at 600 RPM for 2 h, the sample was taken out for each 10 min and filtrated quickly on Whatman paper number GF-A layer, and the residual calcium ion concentration in the liquid phase was analyzed using AAS (Ma et al 2009;Couper et al 2012). …”

Section: Adsorption Kineticsmentioning

confidence: 99%

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

et al. 2016

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Sorption of calcium ion from the hard underground water using novel oxidized graphene (GO) sheets was studied in this paper. Physicochemical properties and microstructure of graphene sheets were investigated using Raman spectrometer, thermogravimetry analyzer, transmission electron microscope, scanning electron microscope. The kinetics adsorption of calcium on graphene oxide sheets was examined using Lagergren first and second orders. The results show that the Lagergren secondorder was the best-fit model that suggests the conception process of calcium ion adsorption on the Go sheets. For isothermal studies, the Langmuir and Freundlich isotherm models were used at temperatures ranging between 283 and 313 K. Thermodynamic parameters resolved at 283, 298 and 313 K indicating that the GO adsorption was exothermic spontaneous process. Finally, the graphene sheets show high partiality toward calcium particles and it will be useful in softening and treatment of hard water.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

et al. 2016

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“…Furthermore, chitosan possesses such properties as good biocompatibility, high adhesion to the surface, a wide range of pH stability, expressed chelating properties. It has been proved that chitosan is an effective bioadsorbent toward some toxic ions, dyes and organic contaminants [20][21][22][23]. Silicas are characterized by advanced surface stability in the acidic medium and highly developed surface, acceptable kinetics, thermal stability, resistance to microbial attack and low cost.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of organomineral adsorbent obtained by sol–gel technology

Budnyak

Yanovska

Kołodyńska

et al. 2016

J Therm Anal Calorim

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Organomineral nanocomposite material has been obtained by sol-gel method through in situ formation of inorganic network in the presence of organic polymer. The most common silica precursor tetraethoxysilane (TEOS) and polysaccharide chitosan solution were used for the sol-gel transformations. The obtained chitosan-silica nanocomposite has been characterized by the physicochemical methods such as differential scanning calorimetry-thermogravimetry-mass spectrometry, Fourier transform infrared spectroscopy-thermogravimetry, elemental analysis, nitrogen adsorption/desorption isotherms, scanning electron microscopy, Fourier transform infrared spectroscopy to determine possible interactions between silica and chitosan macromolecules. Thermal destruction and products from gaseous phase in atmosphere of air and nitrogen were studied. It was found that introducing chitosan in silica network drastically change behavior of polymer during heat treatment in inert atmosphere. Adsorption of microquantities of Zn(II), Cu(II), Fe(III), Cd(II) and Pb(II) cations from the aqueous solutions by the obtained composite has been studied in comparison with the chitosan beads, previously cross-linked with glutaraldehyde. The adsorption capacity and kinetic sorption characteristics of the composite material were estimated. The obtained data were analyzed using the Langmuir and Freundlich isotherms, and the characteristic parameters for each isotherm were determined.

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“…HBP-NH 2 has shown excellent adsorption to several organic polymers [41][42][43][44][45][46] and inorganic materials [47,48]. Furthermore, HBP-NH 2 also has shown enhanced metalbinding behavior [49].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of amino-terminated hyperbranched polymer and its effect on impact resistance of epoxy resin thermosets

Cui

Hou

2015

Colloid Polym Sci

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Amino-terminated hyperbranched polymer (HBP-NH 2 ) was synthesized from diethylenetriamine (DETA) and methyl acrylate (MA) by melt polycondensation through AB 3 and AB 2 route, and its chemical structure was characterized by attenuated total internal reflectance infrared spectroscopy (ATR-IR) and 1 H nuclear magnetic resonance ( 1 H-NMR) spectroscopy. Then, the influence of HBP-NH 2 content on the toughness improvement and fractural surface morphology of diglycidyl ether of bisphenol A (DGEBA) cured systems was investigated through impact resistance test and field emission scanning electron microscopy (FESEM), respectively. The results indicated that HBP-NH 2 can enhance the toughness of epoxy cured system near 61 % than the neat DGEBA cured thermosets. FESEM images show that the toughness enhancement of epoxy system should be based on shearing deformation mechanism (the thermosets modified with low content of HBP-NH 2 ) and the second phase toughening mechanism (the thermosets modified with high content of HBP-NH 2 ).

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Adsorption behaviors of Hg(II) on chitosan functionalized by amino-terminated hyperbranched polyamidoamine polymers

Cited by 114 publications

References 26 publications

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

Absorption of calcium ions on oxidized graphene sheets and study its dynamic behavior by kinetic and isothermal models

Preparation and properties of organomineral adsorbent obtained by sol–gel technology

Synthesis and characterization of amino-terminated hyperbranched polymer and its effect on impact resistance of epoxy resin thermosets

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