Absorbency

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Aiqin Wang - One of the best experts on this subject based on the ideXlab platform.

  • acetylated modification of kapok fiber and application for oil absorption
    Fibers and Polymers, 2013
    Co-Authors: Jintao Wang, Aiqin Wang
    Abstract:

    A novel kapok fiber-based sorbent for oil absorption was successfully prepared by the modification of kapok fiber with acetic anhydride using pyridine as a catalyst. The acetylated kapok fiber was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). The effects of volume ratio of pyridine to acetic anhydride, reaction temperature and time on the oil Absorbency were investigated. The highest oil Absorbency of as-prepared acetylated kapok fiber was 44.0 g/g, 52.5 g/g, and 84.4 g/g for cyclohexane, toluene, and chloroform, respectively. In addition, the oil Absorbency for cyclohexane, toluene, and chloroform reduces by 33.9 %, 39.0 %, and 35.7 % after recycling nine times, respectively. Therefore, the natural renewable kapok fiber could replace those of non-biodegradable oil sorbents in removing toxic organic solvents from industrial sewage.

  • effects of modified vermiculite on the synthesis and swelling behaviors of hydroxyethyl cellulose g poly acrylic acid vermiculite superabsorbent nanocomposites
    Journal of Polymer Research, 2011
    Co-Authors: Jinlei Wang, Wenbo Wang, Yian Zheng, Aiqin Wang
    Abstract:

    A series of hydroxyethyl cellulose-g-poly(acrylic acid)/vermiculite (HEC-g-PAA/VMT) superabsorbent nanocomposites were prepared by radical solution polymerization among hydroxyethyl cellulose (HEC), partially neutralized acrylic acid (AA), raw vermiculite (RVMT), acidified vermiculite (AVMT) and organo-vermiculite (OVMT) in the presence of initiator ammonium persulfate (APS) and crosslinker N,N’-methylenebisacrylamide (MBA). FTIR results revealed that AA was grafted onto HEC backbone and VMT participated in polymerization. VMT was exfoliated during polymerization reaction and a nanocomposite structure was formed as shown by XRD and TEM analysis. Effects of VMT content, concentration of HCl solution and organification degree of OVMT on water Absorbency were investigated and the swelling kinetics of the developed nanocomposites was also evaluated. Results showed that incorporation of VMT greatly enhanced the water Absorbency, and the modified VMT by acidification and organification can improve the water Absorbency more remarkably than raw one. OVMT can improve the swelling capabilities and swelling rate to the highest degree in contrast to RVMT and AVMT.

  • synthesis characterization and swelling behaviors of hydroxyethyl cellulose g poly acrylic acid attapulgite superabsorbent composite
    Polymer Engineering and Science, 2010
    Co-Authors: Jinlei Wang, Wenbo Wang, Aiqin Wang
    Abstract:

    In this work, a series of novel hydroxyethyl cellulose- g-poly(acrylic acid)/attapulgite (HEC-g-PAA/APT) superabsorbent composites were prepared through the graft polymerization of hydroxyethyl cellulose (HEC), partially neutralized acrylic acid (AA), and attapulgite (APT) in aqueous solution, and the composites were characterized by means of Fourier-transform spectroscopy, scanning electron microscopy, and transmission electronmicroscopy. The effects of polymerization variables including concentrations of the initiator and crosslinker and APT content on water Absorbency were studied, and the swelling properties in various pH solutions as well as the swelling kinetics in various saline solutions were also systematically evaluated. Results showed that the introduction of 5 wt% APT into HEC-g-PAA polymeric network could improve both water Absorbency and water absorption rate of the superabsorbent composites. In addition, the superabsorbent composites retained high water Absorbency over a wide pH range of 4–10, and the swelling kinetics of the superabsorbent composites in CaCl2 and FeCl3 solutions exhibited a remarkable overshooting phenomenon. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers

  • study on superabsorbent composites xix synthesis characterization and performance of chitosan g poly acrylic acid vermiculite superabsorbent composites
    Journal of Polymer Research, 2009
    Co-Authors: Aiqin Wang
    Abstract:

    A novel chitosan-g-poly (acrylic acid)/unexpanded vermiculite (CTS-g-PAA/UVMT) superabsorbent composite was prepared by graft polymerization among chitosan (CTS), acrylic acid (AA) and unexpanded vermiculite (UVMT) in aqueous solution. The effect of polymerization variables, including the content of crosslinker, initiator and UVMT, the weight ratio of AA to CTS, the reaction temperature, time and drying method, on water Absorbency were studied. The swelling rate of the superabsorbent composite in distilled water was also investigated. The results from FTIR spectra showed that CTS and UVMT participated in graft polymerization reaction with AA. Introducing UVMT into the CTS-g-PAA polymeric network could form a loose and more porous structure by the SEM analysis, and the polymerization reaction is performed on the surface of UVMT micropowders from the results of XRD. The introduced UVMT enhanced the swelling rate and the water Absorbency of CTS-g-PAA/UVMT superabsorbent composite.

  • synthesis characterization and swelling behaviors of sodium alginate g poly acrylic acid sodium humate superabsorbent
    Carbohydrate Polymers, 2009
    Co-Authors: Shuibo Hua, Aiqin Wang
    Abstract:

    Abstract A novel sodium alginate- g -poly(acrylic acid)/sodium humate superabsorbent was prepared by graft copolymerization with sodium alginate, acrylic acid and sodium humate in aqueous solution, using N,N’ -methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator. The effects of crosslinker, sodium alginate and sodium humate content on water Absorbency of the superabsorbent were studied. The swelling behavior in solutions of various pH and the swelling kinetics in saline solutions (5 mmol/L NaCl and CaCl 2 ) were also investigated. The results from IR analysis showed that both sodium alginate and sodium humate react with the acrylic acid monomer during the polymerization process. The introduction of sodium humate into the sodium alginate- g -poly(acrylic acid) system could enhance the water Absorbency and the superabsorbent containing 10 wt% sodium humate acquired the highest water Absorbency (1380 g/g in distilled water and 83 g/g in 0.9 wt% NaCl solution).

Junping Zhang - One of the best experts on this subject based on the ideXlab platform.

  • study on superabsorbent composites ix synthesis characterization and swelling behaviors of polyacrylamide clay composites based on various clays
    Reactive & Functional Polymers, 2007
    Co-Authors: Junping Zhang, Aiqin Wang
    Abstract:

    Abstract A series of clay-based superabsorbent composite from acrylamide (AM) and various clays, such as attapulgite, kaolinite, mica, vermiculate and Na + -montmorillonite, was prepared by free-radical aqueous polymerization, using N , N ′-methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator, and then saponified with sodium hydroxide solution. In this paper, the reaction mechanism and thermal stability of the superabsorbent composites incorporated with various clays were characterized by FTIR, XRD and TGA, respectively. The effects of clay kind and clay content on equilibrium water Absorbency of these composites were also investigated and compared. In addition, the influences of clay kind on comprehensive swelling behaviors of the PAM/clay superabsorbent composites were studied. The results indicated that the introduced clays could influence physicochemical properties of obtained superabsorbent composites. Mica could improve thermal stability of corresponding superabsorbent composites to the highest degree comparing with the other clays. The PAM/clay superabsorbent composites incorporated with 10 wt% clay of various kinds were all endowed with equilibrium water Absorbency of more than 1300 g g −1 . The equilibrium water Absorbency decreases with increasing clay content and correlates with the kind of clay. Attapulgite-based superabsorbent composite was endowed with higher water Absorbency in univalent cationic saline solution, however, the vermiculite- and the kaolinite-based ones acquired the highest water Absorbency in CaCl 2 and FeCl 3 aqueous solution, respectively. Moreover, the superabsorbent composites incorporated with Na + -montmorillonite have higher swelling rate and that of doped with mica was endowed with higher reswelling capability.

  • study on superabsorbent composite xvi synthesis characterization and swelling behaviors of poly sodium acrylate vermiculite superabsorbent composites
    European Polymer Journal, 2007
    Co-Authors: Yian Zheng, Junping Zhang, Ping Li, Aiqin Wang
    Abstract:

    Abstract A series of superabsorbent composites were synthesized by copolymerization reaction of partially neutralized acrylic acid on unexpanded vermiculite (UVMT) micropowder using N,N′-methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator in aqueous solution. And the samples were further characterized by means of fourier-transform spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The effects of vermiculite content on water Absorbency were studied. Swelling behaviors of the superabsorbent composites in various cationic salt solutions (NaCl, CaCl2 and FeCl3), anionic salt solutions (NaCl, Na2SO4 and Na3PO4) and pH solutions were also systematically investigated. Results obtained showed that the equilibrium water Absorbency increased with increasing UVMT content and the concentration of 20 wt.% clay gave the best absorption (1232 g/g in distilled water and 89 g/g in 0.9 wt.% NaCl). Data achieved also suggested that the water Absorbency in various saline solutions decreased with an increase in the ionic strengths of these solutions. And it was found that at a higher ionic strength (>1 × 10−3 M), the water Absorbency in monovalent cationic solutions was higher than those in multivalent cationic solutions. However, at the same ionic strength (>1 × 10−3 M), the effect of three anionic salt solutions on the swelling has the following order: NaCl

  • synthesis and characterization of chitosan g poly acrylic acid attapulgite superabsorbent composites
    Carbohydrate Polymers, 2007
    Co-Authors: Junping Zhang, Qin Wang, Aiqin Wang
    Abstract:

    A novel chitosan-g-poly(acrylic acid)/attapulgite superabsorbent composite with water Absorbency of 159.6 g g � 1 in distilled water and 42.3 g g � 1 in 0.9 wt% NaCl solution was prepared by graft polymerization with chitosan, acrylic acid and attapulgite in aqueous solution, using N,N 0 -methylenebisacrylamide as a crosslinker and ammonium persulfate as an initiator. Factors influencing water Absorbency of the superabsorbent composite were investigated, such as average molecular weight of chitosan, weight ratio of acrylic acid to chitosan, dewatering method, the amount of crosslinker and attapulgite. The result from FTIR spectra showed that –OH of attapulgite, –OH, –NHCO and –NH2 of chitosan participated in graft polymerization with acrylic acid. The introduced attapulgite enhanced thermal stability of the chitosan-g-poly(acrylic acid) superabsorbent and formed a loose and more porous surface. Introducing a small amount of attapulgite also enhanced water Absorbency of the chitosan-g-poly(acrylic acid) superabsorbent. � 2006 Elsevier Ltd. All rights reserved.

  • preparation and properties of chitosan g poly acrylic acid montmorillonite superabsorbent nanocomposite via in situ intercalative polymerization
    Industrial & Engineering Chemistry Research, 2007
    Co-Authors: Junping Zhang, Li Wang, Aiqin Wang
    Abstract:

    A novel chitosan-g-poly(acrylic acid)/montmorillonite superabsorbent nanocomposite with water Absorbency of 160.1 g g-1 in distilled water and 46.6 g g-1 in 0.9 wt % NaCl solution was prepared by in situ intercalative polymerization among chitosan, acrylic acid, and montmorillonite in aqueous solution, using N,N‘-methylenebisacrylamide as a cross-linker and ammonium persulfate as an initiator. Chitosan could intercalate into layers of montmorillonite and form superabsorbent nanocomposites through in situ graft-polymerization with acrylic acid according to XRD, IR spectra, TEM, and SEM analysis. The one-step method is more convenient, and the corresponding nanocomposites have higher swelling ability and pH-responsivity as compared to the two-step method. Factors influencing water Absorbency of the superabsorbent nanocomposite were investigated, such as weight ratio of acrylic acid to chitosan and montmorillonite content. The introduced montmorillonite could form a loose and porous surface and improve water...

  • study on superabsorbent composite vi preparation characterization and swelling behaviors of starch phosphate graft acrylamide attapulgite superabsorbent composite
    Carbohydrate Polymers, 2006
    Co-Authors: Junping Zhang, Aiqin Wang
    Abstract:

    Abstract A novel starch phosphate-graft-acrylamide/attapulgite superabsorbent composite was prepared by graft-copolymerization among starch phosphate, acrylamide, and attapulgite in aqueous solution. In this paper, factors influencing water Absorbency of the superabsorbent composite such as the molar ratio of NaOH to AM and the amount of starch phosphate and attapulgite were investigated. The superabsorbent composite acquired the highest equilibrium water Absorbency of 1268 g g −1 when the molar ratio of COO − , COOH, and CONH 2 is 10:3:11, the weight ratio of AM to starch phosphate is 5:1, and 10 wt% attapulgite was incorporated. The graft-copolymerization reaction mechanism, morphology, and thermal stability of the composites were also investigated by FTIR, scanning electron microscopy, and thermo-gravimetric analysis, respectively. The introduced starch phosphate and attapulgite endowed the composite a higher thermal stability. In addition, swelling rate, and equilibrium water Absorbency in various saline solutions were investigated to study the effect of starch phosphate and attapulgite on swelling behaviors of the composite. The results indicate that the phosphorylation of starch and the introduction of attapulgite could greatly improve equilibrium water Absorbency, swelling rate and salt-resistant properties of corresponding superabsorbent composite.

Jihuai Wu - One of the best experts on this subject based on the ideXlab platform.

Yian Zheng - One of the best experts on this subject based on the ideXlab platform.

  • effects of modified vermiculite on the synthesis and swelling behaviors of hydroxyethyl cellulose g poly acrylic acid vermiculite superabsorbent nanocomposites
    Journal of Polymer Research, 2011
    Co-Authors: Jinlei Wang, Wenbo Wang, Yian Zheng, Aiqin Wang
    Abstract:

    A series of hydroxyethyl cellulose-g-poly(acrylic acid)/vermiculite (HEC-g-PAA/VMT) superabsorbent nanocomposites were prepared by radical solution polymerization among hydroxyethyl cellulose (HEC), partially neutralized acrylic acid (AA), raw vermiculite (RVMT), acidified vermiculite (AVMT) and organo-vermiculite (OVMT) in the presence of initiator ammonium persulfate (APS) and crosslinker N,N’-methylenebisacrylamide (MBA). FTIR results revealed that AA was grafted onto HEC backbone and VMT participated in polymerization. VMT was exfoliated during polymerization reaction and a nanocomposite structure was formed as shown by XRD and TEM analysis. Effects of VMT content, concentration of HCl solution and organification degree of OVMT on water Absorbency were investigated and the swelling kinetics of the developed nanocomposites was also evaluated. Results showed that incorporation of VMT greatly enhanced the water Absorbency, and the modified VMT by acidification and organification can improve the water Absorbency more remarkably than raw one. OVMT can improve the swelling capabilities and swelling rate to the highest degree in contrast to RVMT and AVMT.

  • study on superabsorbent composite xvi synthesis characterization and swelling behaviors of poly sodium acrylate vermiculite superabsorbent composites
    European Polymer Journal, 2007
    Co-Authors: Yian Zheng, Junping Zhang, Ping Li, Aiqin Wang
    Abstract:

    Abstract A series of superabsorbent composites were synthesized by copolymerization reaction of partially neutralized acrylic acid on unexpanded vermiculite (UVMT) micropowder using N,N′-methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator in aqueous solution. And the samples were further characterized by means of fourier-transform spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The effects of vermiculite content on water Absorbency were studied. Swelling behaviors of the superabsorbent composites in various cationic salt solutions (NaCl, CaCl2 and FeCl3), anionic salt solutions (NaCl, Na2SO4 and Na3PO4) and pH solutions were also systematically investigated. Results obtained showed that the equilibrium water Absorbency increased with increasing UVMT content and the concentration of 20 wt.% clay gave the best absorption (1232 g/g in distilled water and 89 g/g in 0.9 wt.% NaCl). Data achieved also suggested that the water Absorbency in various saline solutions decreased with an increase in the ionic strengths of these solutions. And it was found that at a higher ionic strength (>1 × 10−3 M), the water Absorbency in monovalent cationic solutions was higher than those in multivalent cationic solutions. However, at the same ionic strength (>1 × 10−3 M), the effect of three anionic salt solutions on the swelling has the following order: NaCl

Guoqing Li - One of the best experts on this subject based on the ideXlab platform.

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