Co-reporter:Huacai Ge, Jincui Wang
Chemosphere 2017 Volume 169(Volume 169) pp:
Publication Date(Web):1 February 2017
DOI:10.1016/j.chemosphere.2016.11.069
•A novel grafted activated carbon adsorbent was prepared.•The adsorbent had a unique and ear-like nanosheet structure.•This nanosheet had the diameter of about 300 nm and the thickness of about 40 nm.•The adsorbent had high uptake and very fast rate for the adsorption of Cd(II).•The adsorbent could reach 98.5% Cd(II) removal for real electroplating wastewater.Poly (acrylic acid) modified activated carbon nanocomposite (PAA-AC) was synthesized. The structure and morphology of this nanocomposite were characterized by FTIR, SEM, TEM, XRD and Zeta potential. The adsorption of some heavy metal ions on PAA-AC was studied. The characterization results indicated that PAA-AC was a novel and ear-like nanosheet material with the thickness of about 40 nm and the diameter of about 300 nm. The adsorption results exhibited that the introduction of carboxyl groups into activated carbon evidently increased the uptake for heavy metal ions and the nanocomposite had maximum uptake for Cd(II). Various variables affecting adsorption of PAA-AC for Cd(II) were systematically explored. The maximum capacity and equilibrium time for adsorption of Cd(II) by PAA-AC were 473.2 mg g−1 and 15 min. Moreover, the removal of Cd(II) for real electroplating wastewater by PAA-AC could reach 98.5%. These meant that the removal of Cd(II) by PAA-AC was highly efficient and fast. The sorption kinetics and isotherm fitted well with the pseudo-second-order model and Langmuir model, respectively. The adsorption mainly was a chemical process by chelation. Thermodynamic studies revealed that the adsorption was a spontaneous and endothermic process. The results revealed that PAA-AC could be considered as a potential candidate for Cd(II) removal.
Co-reporter:Huacai Ge, Tingting Hua
Carbohydrate Polymers 2016 Volume 153() pp:246-252
Publication Date(Web):20 November 2016
DOI:10.1016/j.carbpol.2016.07.110
•Poly(maleic acid)-grafted crosslinked chitosan nanomaterial was prepared.•The graft polymerizing and crosslinking degree of chitosan was controlled.•The nanomaterial had selectivity and high uptake for sorption of Hg(II).•The Hg(II)-loaded nanomaterial could be regenerated with EDTA.Chitosan-poly(maleic acid) nanomaterial (PMACS) with the size of 400–900 nm was synthesized by grafting poly(maleic acid) onto chitosan and then crosslinking with glutaraldehyde. The synthesis conditions were optimized. The structure and morphology of PMACS were characterized by FT-IR, XRD, SEM and TGA. PMACS was used to adsorb some heavy metal ions such as Hg(II), Pb(II), Cu(II), Cd(II), Co(II), and Zn(II). The results indicated that PMACS had selectivity for Hg(II) sorption. The effects of various variables for sorption of Hg(II) were further explored. The maximum capacity for Hg(II) sorption was found to be 1044 mg g−1 at pH 6.0, which could compare with the maximal value of the recently reported other sorbents. The sorption followed the pseudo-second-order kinetics and Langmuir isotherm models. The rising of temperature benefited the uptake and the sorption was a spontaneous chemical process. The sorbent could be reused with EDTA. Hence, the nanomaterial would be used as a selective and high uptake sorbent in the removal of Hg(II) from effluents.
Co-reporter:Huacai Ge, Senkang Wang
Carbohydrate Polymers 2014 Volume 113() pp:296-303
Publication Date(Web):26 November 2014
DOI:10.1016/j.carbpol.2014.06.078
•Superabsorbent resin was prepared by thermal reaction.•The thermal reaction conditions were optimized.•The resin had water absorbency equivalent to the radical inducing product.•The possible mechanism for the thermal reaction was suggested.•Thermal reaction was a safer method.Chitosan–acrylic acid superabsorbent polymer was successfully prepared by the thermal reaction without using initiator and crosslinker in air. The effects of some reaction variables on the water absorbency of this polymer were investigated by orthogonal tests, and the optimal conditions were described. The influences of temperature, time, ratio of the reactants and neutralization degree of acrylic acid on the reaction were further studied. These polymers were also prepared in nitrogen atmosphere and by using a radical initiator and compared against thermal reaction obtained polymers. The structures of the polymers were characterized by FT-IR, TGA, XRD, 13C NMR and elemental analyses. The results showed that the thermal reaction product of acrylic acid with chitosan might form N-carboxyethyl grafted and amide-linked polymer and this product could absorb water 644 times its own dry weight. The possible mechanism for the thermal reaction was further suggested. The purpose of this research was to explore the friendly synthesized method of the superabsorbent.
Co-reporter:Huacai Ge;Hui Chen ;Shiying Huang
Journal of Applied Polymer Science 2012 Volume 125( Issue 4) pp:2716-2723
Publication Date(Web):
DOI:10.1002/app.36588
Abstract
A novel chitosan-based adsorbent (CCTM) was prepared by the reaction of epichlorohydrin O-crosslinked chitosan with maleic anhydride under microwave irradiation. The chemical structure of this polymer was characterized by infrared spectroscopy and X-ray diffraction analyses. The effects of various variables such as degree of substitution, adsorption time, initial metal ion concentration, solution pH, and temperature, on the adsorption of Pb2+ and Cu2+ by CCTM were investigated. The results demonstrate that the microwave irradiation can remarkably enhance the reaction. CCTM has higher adsorption capacity than chitosan. The maximum adsorption capacities for Pb2+ and Cu2+, with initial concentrations of 0.02 mol L−1 at pH 5, are 246.3 and 132.5 mg g−1, respectively. The adsorbent can be recycled. These results have important implications for the design of effective chitosan-based adsorbents in the removal of heavy metal ions from wastewaters. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Co-reporter:H. Ge;X. Fan
Chemical Engineering & Technology 2011 Volume 34( Issue 10) pp:1745-1752
Publication Date(Web):
DOI:10.1002/ceat.201000182
Abstract
A novel activated carbon-chitosan complex adsorbent (ACCA) was prepared via the crosslinking of glutaraldehyde and activated carbon-(NH2-protected) chitosan complex under microwave irradiation. The surface morphology of this adsorbent was characterized. The adsorption of ACCA for Pb2+ and Cd2+ was investigated. The results demonstrate that ACCA has higher adsorption capacity than chitosan. The adsorption follows pseudo first-order kinetics. The isotherm adsorption equilibria are better described by Freundlich and Dubinin-Radushkevich isotherms than by the Langmuir isotherm. The adsorbent can be recycled. These results have important implications for the design of low-cost and effective adsorbents in the removal of heavy metal ions from wastewaters.
Co-reporter:Huacai Ge;Shiying Huang
Journal of Applied Polymer Science 2010 Volume 115( Issue 1) pp:514-519
Publication Date(Web):
DOI:10.1002/app.30843
Abstract
A novel chitosan-based adsorbent (CCTE) was synthesized by the reaction between epichlorohydrin O-cross-linked chitosan and EDTA dianhydride under microwave irradiation (MW). The chemical structure of this new polymer was characterized by infrared spectra analysis, thermogravimetric analysis, and X-ray diffraction analysis. The results were in agreement with the expectations. The static adsorption properties of the polymer for Pb2+, Cu2+, Cd2+, Ni2+, and Co2+ were investigated. Experimental results demonstrated that the CCTE had higher adsorption capacity for the same metal ion than the parent chitosan and cross-linked chitosan. In particular, the adsorption capacities for Pb2+ and Cd2+ were 1.28 mmol/g and 1.29 mmol/g, respectively, in contrast to only 0.372 mmol/g for Pb2+ and 0.503 mmol/g for Cd2+ on chitosan. Kinetic experiments indicated that the adsorption of CCTE for the above metal ions achieved the equilibrium within 4 h. The desorption efficiencies of the metal ions on CCTE were over 93%. Therefore, CCTE is an effective adsorbent for the removal and recovery of heavy metal ions from industrial waste solutions. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
Co-reporter:Zuoying Cao, Huacai Ge, Shengli Lai
European Polymer Journal 2001 Volume 37(Issue 10) pp:2141-2143
Publication Date(Web):October 2001
DOI:10.1016/S0014-3057(01)00070-2
A series of cross-linked chitosan resins have been synthesized by forming chitosan coordination of Cu(II) as template in dilute acetic acid solutions under microwaves irradiation, then reacting the Cu(II)–chitosan complex with glutaraldehyde as cross-linking agent under microwave irradiation, and finally removing off the Cu(II ) with dilute acid. The adsorption capacity and selectivity of the cross-linked chitosan for Cu2+, Ni2+ and Co2+ have also been investigated. The experimental results show that these resins obtained have better adsorption capacity for Cu2+ than Ni2+ and Co2+, very good stability and reusability in acidic solutions.
