Co-reporter:
Polymer Engineering & Science 2017 Volume 57(Issue 1) pp:69-77
Publication Date(Web):2017/01/01
DOI:10.1002/pen.24386
Poly(acrylic acid-co-acrylamide)/sodium carboxymethyl cellulose/vermiculite (VMT) superabsorbent polymers (SAPs) were prepared by frontal polymerization (FP), a kind of polymerization model characterized by short reaction times and low-energy consumption. The effects of VMT content and monomer ratios on frontal parameters and water absorbency were investigated. Due to the good heat insulation property of VMT, the propagating front still sustained at high VMT concentrations (over 30%). The preparation of SAPs with high VMT-loading via FP has advantages of low energy consumption and low materials prices, decreasing the cost of SAPs effectively. SAPs with slow-release fertilizer (SSRF) were obtained by embedding urea into their networks during the FP process. The addition of urea not only endows SAPs with slow release function of urea (more than 30 days in soil), but also increases their water absorbency (by 17.4%). The effects of obtained SSRF on tall fescue seeds germination and growth were studied. Compared with the control group, the germination rate and vigor index of tall fescue seeds applied SSRF with 10% urea increased by 17.5 and 80.2%, respectively. POLYM. ENG. SCI., 57:69–77, 2017. © 2016 Society of Plastics Engineers
Co-reporter:Jingkuo Zhou, Jianping Gao, Xiaoyang Xu, Wei Hong, Yahui Song, Ruinan Xue, Huilin Zhao, Yu Liu, Haixia Qiu
Journal of Alloys and Compounds 2017 Volume 709(Volume 709) pp:
Publication Date(Web):30 June 2017
DOI:10.1016/j.jallcom.2016.11.052
•Porous Bi@Cs networks have been synthesized by a facile one-step hydrothermal method.•Sodium alginate as a “green” reduction agent and carbon source.•The Bi@Cs displayed high catalytic activity for the reduction of 4-nitrophenol.•The activity factor of the Bi@Cs was 242.9 s−1g−1.•Factors that affect the catalytic performance were studied.In this work, a facile one-step hydrothermal method has been developed for the fabrication of bismuth nanoparticles embedded carbon nanocomposites (Bi@Cs) with porous network structure. In this approach, natural polysaccharide alginate acts as both carbon source and reducing agent that can reduce Bi3+ to form Bi nanoparticle. The Bi@Cs were characterized by X-ray diffraction, transmission electronic microscopy, energy dispersive X-ray spectrum, Fourier transform infrared spectroscopy, and Brunauer-Emmett-Teller analysis. The catalytic activity of the Bi@Cs for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride was tracked by UV–visible spectroscopy. It was found that the Bi@Cs displayed high activity in the 4-NP reduction, which is superior to many noble metal nanoparticle supported catalysts.
Co-reporter:Huilin Zhao
The Journal of Physical Chemistry C 2016 Volume 120(Issue 22) pp:11938-11946
Publication Date(Web):May 17, 2016
DOI:10.1021/acs.jpcc.6b01987
The synthesis of poly-2-hydroxyethyl methacrylate inverse-opal hydrogel (IOHGPHEMA) was realized by capillary-force-induced in situ polymerization in a polystyrene colloidal crystal template. The created IOHGPHEMA films show brilliant blue-violet color when they are immersed in deionized water and reach swelling equilibrium. The stop band of the IOHGPHEMA films can be tuned within the entire visible wavelength range by immersing them into different chemical solutions, such as aldehydes, ketones, amides, dimethyl sulfoxide, and alcohols. The extent of the reflective peak shift not only depends on the number of hydrogen band donors but also on the chain length and structure of the chemicals and their concentration. Since the IOHGPHEMA films have different reflectance spectra and structural colors in response to different compounds of the same series, this provides a potential way to visually detect homologues and other compounds with similar structure and properties. This simple, yet effective, method also has the potential to be used generically to determine approximate concentration of the solution by direct visual observation of the color change.
Co-reporter:Cheng Pan, Lei Zhang, Zeng Pan, Mingxi Chen, Yue Liu, Guanbo Huang, Heya Na, Wei Wang, Haixia Qiu, Jianping Gao
Materials Chemistry and Physics 2015 Volume 167() pp:315-319
Publication Date(Web):1 November 2015
DOI:10.1016/j.matchemphys.2015.10.050
•PANI intercalates into the EG sheets and forms a sandwich structure.•Ultrasonic mixing PANI with EG method is simple and effective.•Power factor of PANI/EG is higher than some PANI based composites.Polyaniline/expanded graphite (PANI/EG) composites with enhanced thermoelectric properties have been successfully synthesized by a simple ultrasonic mixing method with different EG contents. Their structure and morphology were investigated by XRD, SEM, and FTIR. Besides, thermal stability was investigated by TG analysis, which indicated that the PANI/EG composites exhibit better thermal stability than pure PANI. The PANI/EG composites show an interesting structure: PANI intercalates into the EG sheets and forms a sandwich structure. The thermoelectric properties of the samples were measured at room temperature. With the EG content increasing, the electrical conductivity and Seebeck coefficient were improved. As a result, a remarkably improved thermoelectric power factor was achieved. This work demonstrates a simple and effective method for improving the thermoelectric properties of conducting polymers.
Co-reporter:Mingyi Tang, Guanbo Huang, Sai Zhang, Yue Liu, Xianxian Li, Xingrui Wang, Xiaobo Pang, Haixia Qiu
Materials Chemistry and Physics 2014 Volume 145(Issue 3) pp:418-424
Publication Date(Web):16 June 2014
DOI:10.1016/j.matchemphys.2014.02.030
•A new poly(acrylamide-co-acryl acid) hydrogel with ordered macropores.•A simple in situ fabrication of nickel nanoparticles under mild conditions.•High-performance heterogeneous catalyst for removal of nitrophenol from water.•Good recyclability of catalyst without any complicated regeneration process.A facile route for the in situ preparation of catalytically active Ni nanoparticles (NPs) in ordered macroporous hydrogel (OMH) has been developed. The hydrogel was fabricated based on polystyrene colloid template. The electronegativity of amide and carboxyl groups on the poly(acrylamide-co-acryl acid) chains of the hydrogel caused strong binding of Ni2+ ions which made them distribute uniformly inside the hydrogel. When immersed in NaBH4 aqueous solution, the Ni2+ ions on the hydrogel were reduced to Ni NPs. The resultant Ni NPs loaded OMH showed good catalytic activity for the reduction of a common organic pollutant, 4-nitrophenol, with NaBH4. A kinetic study of the catalytic reaction was carried out. The rate constant per unit weight could reach 0.53 s−1 g−1, which is much better than many common hydrogel loaded nickel catalysts. Moreover, the current catalyst can be easily separated and recovered with stable catalytic activity.
Co-reporter:Ruobing Zhang;Zhaoxia Qiu;Xionghui Zhang
Journal of Applied Polymer Science 2014 Volume 131( Issue 3) pp:
Publication Date(Web):
DOI:10.1002/app.39825
ABSTRACT
Polyacrylic acid/montmorillonite(MMT)/carboxymethylcellulose (CMC) superabsorbent nanocomposites were prepared by frontal polymerization (FP), an economic method characterized by low-energy consumption and short-reaction time. They were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. The effects of reaction parameters on the front propagation and the water absorbency of the nanocomposites were investigated. Furthermore, the effects of the obtained products on soil water holding capacity and soil water stable macro-aggregates were studied. Compared with the control soil, soil mixed with the nanocomposites showed a significant increase (by 52.4%) in field water holding capacity. The incorporation small amounts of MMT effectively promoted the formation of soil water stable macro-aggregates, which increased by 76% as the addition of the MMT increased to 4 wt %. The samples obtained by FP showed much better performance in the formation of soil water stable macro-aggregates, salt resistance, and thermal stability than those obtained by conventional batch polymerization. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39825.
Co-reporter:Haixia Qiu;Zhaoxia Qiu;Jialing Wang;Ruobing Zhang;Fuyuan Zheng
Journal of Applied Polymer Science 2014 Volume 131( Issue 6) pp:
Publication Date(Web):
DOI:10.1002/app.40013
ABSTRACT
Polyacrylamide/sodium alginate modified montmorillonite (PAM/SA-MMT) superabsorbent composites were synthesized by free-radical polymerization under normal atmospheric conditions. They were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy (FTIR). Their water absorbency and methylene blue (MB) adsorption behaviors were studied. Compared with PAM/MMT composites, PAM/SA-MMT composites demonstrated greater water absorbency (863 g g−1 in distilled water and 101 g g−1 in 0.9 wt % NaCl solution) and higher adsorption capacity of 2639 mg g−1 for MB. The adsorption behaviors of the composites showed that the isotherms and adsorption kinetics were in good agreement with the Langmuir equation and pseudo-second-order equation, respectively. FTIR analysis suggested that the MB adsorption of PAM/SA-MMT composites via a mechanism combined electrostatic, H-bonding and hydrophobic interaction. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014, 131, 40013.
Co-reporter:Feihui Li, Yongqin Guo, Yue Liu, Haixia Qiu, Xiying Sun, Wei Wang, Yu Liu, Jianping Gao
Carbon 2013 Volume 64() pp:11-19
Publication Date(Web):November 2013
DOI:10.1016/j.carbon.2013.05.056
Pt–Cu/reduced graphene oxide (Pt–Cu/RGO) hybrids with different Pt/Cu ratios were prepared by the reduction of H2PtCl6 and CuSO4 by NaBH4 in the presence of graphene oxide (GO). The Pt–Cu nanoparticles were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The reduction of GO was verified by ultraviolet–visible absorption spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. Compared to Pt/RGO, the Pt–Cu/RGO hybrids have superior electrocatalytic activity and stability for the oxidation of methanol and formic acid. Thus they should have potential applications in direct methanol and formic acid fuel cells.
Co-reporter:Feihui Li, Yongqin Guo, Mingxi Chen, Haixia Qiu, Xiying Sun, Wei Wang, Yu Liu, Jianping Gao
International Journal of Hydrogen Energy 2013 Volume 38(Issue 33) pp:14242-14249
Publication Date(Web):4 November 2013
DOI:10.1016/j.ijhydene.2013.08.093
•Pt–Cu/RGO was prepared via a one step reduction using NaBH4 as reducing agent.•Pt–Cu supported on RGO as anode catalyst for DMFCs and DEFCs.•Pt–Cu/RGO showed enhanced catalytic activity for methanol oxidation than Pt/RGO.•Pt–Cu/RGO showed enhanced catalytic activity for ethanol oxidation than Pt/RGO.Pt–Cu bimetallic nanoparticles supported on reduced graphene oxide (Pt–Cu/RGO) were synthesized through the simple one-step reduction of H2PtCl6 and CuSO4 in the presence of graphene oxide (GO) at room-temperature. The Pt–Cu/RGO was characterized with UV–vis spectrophotometer, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy and its catalytic behavior for the direct oxidation of methanol was investigated. Compared to Pt/RGO and Pt/C catalysts, Pt–Cu/RGO hybrids exhibited markedly superior catalytic activity for the electrocatalytic oxidation of methanol and ethanol. This improved catalytic activity can be attributed to the dendritic structure of the Pt–Cu bimetallic nanoparticles.
Co-reporter:Yongqiang He, Xingrui Wang, Di Wu, Qiaojuan Gong, Haixia Qiu, Yue Liu, Tao Wu, Junkui Ma, Jianping Gao
Materials Chemistry and Physics 2013 Volume 142(Issue 1) pp:1-11
Publication Date(Web):15 October 2013
DOI:10.1016/j.matchemphys.2013.05.036
•GO/amylose composite films were prepared by a solution casting method.•GO/amylose composite films had good dispersion of GO in the composite.•GO/amylose composite films had a significant improvement in mechanical properties.•GO/amylose composite films were stable in both acidic and alkaline aqueous mediums.Graphene oxide/amylose (GO/amylose) composite films with different amounts of graphene oxide (GO), glycerol and polyvinyl alcohol (PVA) were prepared by a solution casting method. The structure, morphologies, and properties of the films were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis, UV–vis spectroscopy and tensile tests. The results indicated good dispersion of the GO nanosheets in the GO/amylose composite films and consequently a significant improvement in their mechanical properties. The addition of GO increased the tensile strength of the GO/amylose films, significantly. When glycerol was used as a plasticizer, the elongation at break of the films increased. When PVA was also added to the composite films, the films were mechanically strong and flexible. The incorporation of GO also decreased the moisture absorbability and UV transmittance of the films. The stability of the GO/amylose films in acidic and alkaline solutions was also studied and the films had excellent stability in both acidic and alkaline aqueous mediums.
Co-reporter:Yongqiang He, Nana Zhang, Qiaojuan Gong, Haixia Qiu, Wei Wang, Yu Liu, Jianping Gao
Carbohydrate Polymers 2012 Volume 88(Issue 3) pp:1100-1108
Publication Date(Web):15 April 2012
DOI:10.1016/j.carbpol.2012.01.071
Sodium alginate/graphene oxide (NaAlg/GO) fibers were prepared using a wet spinning method. Their structures and properties were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction and mechanical strength testing. The incorporation of GO significantly improved the strength of the NaAlg/GO fibers owing to the uniform distribution of the GO nanosheets in the NaAlg matrix. The maximum tensile strength and Young's modulus increased from 0.32 and 1.9 to 0.62 and 4.3 GPa, respectively, at 4 wt% GO loading. The composite fibers had an even higher strength when they were stretched. The tensile strength increased by 43% over the un-stretched fiber, and Young's modulus increased to 9.39 GPa. In aqueous solution, the GO/NaAlg fibers swelled to form hydrogel fibers that are nontoxic to cells which demonstrated the potential applications of the as-spun fibers in wound dressing materials.Highlights► Graphene oxide/sodium alginate (GO/NaAlg) fibers were prepared using a wet spinning method. ► Their tensile strength and Young's modulus reached 0.62 and 4.3 GPa with 4 wt% GO, respectively. ► Young's modulus of the GO/NaAlg fibers could be higher when they were stretched. ► The GO/NaAlg fibers swelled in aqueous solution to form hydrogel fibers that are nontoxic to cells.
Co-reporter:Yongqiang He, Nana Zhang, Qiaojuan Gong, Zhiliang Li, Jianping Gao, Haixia Qiu
Materials Chemistry and Physics 2012 Volume 134(2–3) pp:585-589
Publication Date(Web):15 June 2012
DOI:10.1016/j.matchemphys.2012.04.011
Graphene oxide (GO) and reduced graphene oxide (RGO) 3D porous monoliths were prepared using a simple and green method, unidirectional freeze-drying method. Gold or silver nanoparticles were deposited on the GO nanosheets to form Au/GO and Ag/GO nanocomposites under the reducing action of GO without using any reducing agent or surfactant. The Au or Ag nanoparticles loaded GO 3D porous monoliths (Au/GO or Ag/GO 3D porous monoliths) prepared from Au/GO and Ag/GO nanocomposites by unidirectional freeze-drying method had an order (unidirectional) porous structure and high porosity. The Au/GO or Au/RGO 3D porous monoliths not only had high catalytic activity in the reduction of 4-nitrophenol and Suzuki–Miyaura coupling reaction, but also showed good recyclability.Highlights► Au/GO and Ag/GO hybrid materials were fabricated without adding any reducing agents. ► Au/GO and Ag/GO aerogels were prepared using unidirectional freeze-drying method. ► The Au/GO aerogels were excellent catalysts for the reduction of 4-nitrophenol. ► The Au/RGO aerogels showed superior catalytic activity for the Suzuki reaction. ► The Au/RGO aerogels exhibit good reusability.
Co-reporter:Haixia Qiu ;Jiugao Yu
Journal of Applied Polymer Science 2008 Volume 107( Issue 1) pp:118-123
Publication Date(Web):
DOI:10.1002/app.26261
Abstract
Montmorillonite (MMT) was modified with carboxymethylcellulose (CMC). The X-ray diffraction (XRD) and FTIR analyses showed that the CMC chains had intercalated into the MMT sheets, and the strong chemical interaction between the ether bonds from CMC and SiO bonds from MMT was the driving force for intercalation. Polyacrylate (PAA)/modified MMT superabsorbent nanocomposites were fabricated by effectively dispersing the modified MMT in acrylic acid solution and polymerizing the acid. The superabsorbent composites were characterized by XRD, TEM, and FTIR. The influence of modified MMT, weight ratio of CMC to MMT, and modified MMT content in the nanocomposites on the water absorbency was investigated. Results showed that the introduction of pure MMT could decrease the water absorbency of the gel, but adding modified MMT could not only effectively increase the water absorbency of the gel, but also improve its water retention ability. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Co-reporter:Mingyi Tang, Guanbo Huang, Chunjuan Gao, Xianxian Li, Haixia Qiu
Materials Chemistry and Physics (15 April 2017) Volume 191() pp:
Publication Date(Web):15 April 2017
DOI:10.1016/j.matchemphys.2017.01.014
•In situ synthesis of cobalt nanoparticles on the reduced graphene oxide nanosheets.•Graphene based composite as cladding material for commercial polyurethane sponge.•Catalyst for the hydrolysis reaction of sodium borohydride to generate hydrogen.•High performance, easily recoverable and durable catalyst system.Cobalt nanoparticles supported elastic foam (Co-F) was prepared by coating commercial polyurethane foam with cobalt nanoparticle loaded hybrids (Co/rGO). The Co-F was applied to catalyze hydrolysis reaction of sodium borohydride to produce hydrogen gas. Co-F has large surface area and interconnected pores, so it showed outstanding activity in catalyzing the hydrolysis reaction and achieved a hydrogen production rate of 33.2 mL·min−1. The conditions for Co/rGO and Co-F preparation as well as reaction conditions like the reaction temperature, the concentration of NaBH4 and pH value all affected the catalytic hydrolysis of NaBH4. The Co-F could be easily recovered by taking out, pressing and rinsing in distilled water, and it exhibited almost unfaded catalytic activity in the reusage. The unique properties will make Co-F potential applications in catalytically chemical reactions.
Co-reporter:Yahui Song, Jianping Gao, Xiaoyang Xu, Huilin Zhao, Ruinan Xue, Jingkuo Zhou, Wei Hong, Haixia Qiu
Materials Science and Engineering: C (1 June 2017) Volume 75() pp:
Publication Date(Web):1 June 2017
DOI:10.1016/j.msec.2017.02.118
•An improved mechanical supramolecular hybrid gel based on folic acid•The hybrid gel is thermal sensitive and the gelation temperature can be adjusted under external stimuli.•The hybrid gel can be used as an injectable gel for drug delivery.Thermal sensitive supramolecular hybrid gels for injectable drug release were prepared by adding different amounts of agar into folic acid (FA) gelator. The gelation temperature was modulated in order to form injectable gel with body temperature (37 °C). Such kind of folic acid-agar (FAG) hybrid gel makes it possible to use supramolecular gel as injectable drug loaded gels for drug release. FT-IR and UV–vis spectra indicate that agar macromolecules involve in the self-assembly process through intermolecular H-bonding and π-π stacking interactions with FA molecules. The SEM and TEM images demonstrate that the fiber diameter of FAG hybrid gel is about 20 nm, much smaller than that of FA gel (40 nm). However, FAG hybrid has a denser nano-fibrous network structure than FA gels. Moreover, FAG hybrid gel is endowed with a more ordered network structure and a little better crystallization capability by adding agar. FAG hybrid gel also shows a shear-thinning behavior but the shear viscosity is about 2 times higher than that of FA gel. Compared with FA gel, the storage (G′) and loss (G″) moduli of the FAG gel are higher, which implies an enhanced gel strength. At the same time, both FA and FAG gels are facilely affected by some external factors such as acid, base and salts. In acidic or basic conditions, the strength became weak and the gelation temperature (Tg) decreased. While, within certain concentrations, the salt (NaCl) increased the gel strength and Tg. FAG gel suffered lower mass loss and owned better stability in different pH solutions compared with pure FA gel. The release behavior of the FA and injectable FAG gels was investigated by using Rhodamine B as a mimic model drug. FAG hybrid gel shows a long release profile and the release time is 3 times longer than that of FA gel, up to 30 h, and the accumulative release amount reaches about 86%. So it is a potential injectable gel for sustained release drug delivery system.
Co-reporter:Xiang Ji, Yahui Song, Jing Han, Lin Ge, Xiaoxiang Zhao, Chen Xu, Yongqiang Wang, Di Wu, Haixia Qiu
Journal of Colloid and Interface Science (1 July 2017) Volume 497() pp:
Publication Date(Web):1 July 2017
DOI:10.1016/j.jcis.2016.09.049
•This approach provides a green method to produce stable RGO from GO.•Sodium salicylate (SS) was loaded onto the RGO through π-π interactions.•The release of the loaded SS can be controlled by adjusting the solution pH.A green approach for the preparation of a stable reduced graphene oxide (RGO) suspension from graphene oxide (GO) has been developed. This method uses l-serine (l-Ser) as the reductant and yellow dextrin (YD) as the stabilizing agent. X-ray photoelectron spectroscopy, UV–vis spectroscopy, X-ray diffraction and thermogravimetric analyses showed that l-Ser can efficiently reduce GO at a comparatively low temperature, and that the YD adsorbed onto the RGO facilitating the formation of a stable RGO aqueous suspension. Since l-Ser and YD are natural environmentally friendly materials, this approach provides a green method to produce stable RGO from GO on a large scale. Sodium salicylate (SS) which has an aromatic structure was loaded onto the RGO through π-π interactions and a maximum loading capacity of 44.6 mg/g was obtained. The release of the loaded SS can be controlled by adjusting the solution pH, and a 74.8% release was reached after 70 h at pH 7.4. The release profile of SS could be further controlled by incorporating it into RGO Dispersed carboxylated chitosan films.
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