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Xie X.-L.,Guilin University of Technology | Peng P.,Guilin University of Technology | Zhu W.-F.,Guilin University of Technology | Wang L.-I.,Ministry province Jointly constructed Cultivation Base for State Key Laboratory of Processing for Non ferrous Metal and Featured Materials
Advanced Materials Research | Year: 2014

Geopolymeric material (geopolymer) was synthesized by casting and curing method using Bayer process red mud and metakaolin as starting materials. The fixation ability of the geopolymer for Pb2+ was studied by leaching method. The results shown that metakaolin played the role of aluminum and silicon donor during the initial strong alkaline aqueous phase. Red mud had principally the role of filler, increasing in this way the final compressive strength of the geopolymer. The compress strength of geopolymer curing 3 days from metakaolin and red mud mixture is 66MPa. The leaching concentration of Pb2+ from 50% red mud geopolymer is 0.891mg/L as the Pb2+ content in geopolymer is 2.5%; the metakaolin-red mud geopolymer has better Pb2+ fixation ability than metakaolin geopolymer. © (2014) Trans Tech Publications, Switzerland.

Liang Q.-C.,Guilin University of Technology | Chen Y.,Guilin University of Technology | Li C.-J.,Guilin University of Technology | Xie X.-L.,Guilin University of Technology | And 3 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

Acetate-intercalated layered double hydroxide (Aco-LDH) was prepared by ion-exchange of NO3-LDH with sodium acetate trihydrate. The Aco-LDH was delaminated by ultrasonic processing in aqueous solution and montmorillonite (MMT) was dispersed into lamella in water. The LDH/MMT layered composite was gained by electrostatic attraction of delaminated LDH nanosheets with the interlayer of MMT. The composite was characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), atomic force microscope (AFM) and N2-adsorption/desorption. The results show that the thickness of delaminated Aco-LDH nanosheets was 5 nm to 20 nm at the Aco-LDH concentration of 1 mg/mL. The LDH/MMT layered composite obtained by intercalation assembly has sheet-by-sheet assembly structure, and the interlayer space of the composite is 1.50 nm, which is almost the thickness summation of one LDH sheet and one MMT sheet. The specific surface area of the composite is 105.89 m2/g. © 2015, Chinese Ceramic Society. All right reserved.

Li C.,Guilin University of Technology | Zhang J.,Guilin University of Technology | Lin Y.,Guilin University of Technology | Chen Y.,Guilin University of Technology | And 5 more authors.
Applied Clay Science | Year: 2015

Layered double hydroxide (LDH) was in situ grown on the disordered platelets of montmorillonite (Mt), and a self-assembled sheet-on-sheet nanohybrid was obtained. To obtain a nanohybrid of cationic/anionic clay with exfoliated Mt platelets, NaMt (sodium-montmorillonite) was fractionated and subsequently treated by ultrasonication in a solution of aluminum nitrate and magnesium nitrate to ensure good dispersion of the NaMt and cation adsorption. Subsequently, the precursors were reacted with ammonia under hydrothermal conditions. The phase compositions of the as-prepared samples were analyzed by X-ray diffraction and Fourier transform infrared spectroscopy. Field-emission scanning electron microscopy and high-resolution transmission electron microscopy investigations revealed the typical sheet-on-sheet and exfoliated Mt structures. The results demonstrated that the LDH grown on the disordered platelets of montmorillonite was successfully synthesized by a simple in situ growth route. A possible formation mechanism for the sheet-on-sheet architecture has been suggested. Using ultrasonically pre-exfoliated disordered Mt platelets as matrixes provided an essential substrate for the nucleation and in situ growth of LDH crystallites. The ammonia solution provided hydroxyl moieties for LDH growth and split the Mt platelets via a breaker effect. It is suggested that the in situ-grown LDH crystals, as spacers, played a crucial role in preventing the reaggregation of the disordered Mt platelets. This study can offer some new insights into developing a nanohybrid of cationic/anionic clay with a unique sheet-on-sheet structure. © 2015 Elsevier B.V.

Sun F.M.,Ministry province Jointly constructed Cultivation Base for State Key Laboratory of Processing for Non ferrous Metal and Featured Materials | Sun F.M.,Key Laboratory of Nonferrous Materials and New Processing Technology | Sun F.M.,Guilin University of Technology | Xu W.F.,Ministry province Jointly constructed Cultivation Base for State Key Laboratory of Processing for Non ferrous Metal and Featured Materials | And 8 more authors.
Journal of Polymer Research | Year: 2014

A series of polymerized high internal phase emulsions (polyHIPEs) with different cavities and windows (named PSD) were used as microreactors. Then methyl methacrylate (MMA) was polymerized in the spaces of the polyHIPE by reverse atom transfer radical polymerization (RATRP). The resulting materials and PMMA in the polyHIPEs were characterized by scanning electron microscopy, gel permeation chromatography, Fourier transform infrared spectroscopy, thermogravimetry, hydrogen nuclear magnetic resonance and differential scanning calorimetry. The results suggest that the monomer MMA is polymerized in the PSDs by RATRP. The confinement effect of the different cavities and pores is obvious but it weakens with the increase of the pore size. Compared with the conventional PMMA by RATRP, the number-average molecular weight and temperature of the initial decomposition of the PMMA obtained from PSDs is significantly high, which suggests that the confined space in the PSDs plays an active role in RATRP. © 2014, Springer Science+Business Media Dordrecht.

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