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Pan R.,Sichuan Normal University | Wang L.L.,Sichuan Normal University | Liu Y.,Key Laboratory of Special Waste Water Treatment
Material Science and Environmental Engineering - Proceedings of the 3rd annual 2015 International Conference on Material Science and Environmental Engineering, ICMSEE 2015 | Year: 2016

Octa (propylglycidyl ether) polyhedral oligomeric silsesquioxane (Ope-POSS) with eight glycidyl groups was incorporated in concentrations of 5, 10, 15 and 20 wt% into Toluene-2, 4- Diisocyanate (TDI) and Poly-Propylene oxide Gloycol (PPG) to construct Ope-POSS/PU hybrid composites models, respectively. The glass transition temperature of these hybrid composite models was characterized by volume-temperature behavior analysis. As the result shows: the stiff enclosed cage of Ope-POSS linked to the polymer backbones acts as a rigid node with less mobility and results in the steric hindrance of polymer chain apparently, which lead to the increasing Tg and also broaden the glass transition region of Ope-POSS/PU hybrid composites. © 2016 Taylor and Francis Group, London.

Cai L.,Sichuan Normal University | Cai L.,Key Laboratory of Special Waste Water Treatment | Xiong X.,Sichuan Normal University | Liang N.,Sichuan Normal University | Long Q.,Sichuan Normal University
Applied Surface Science | Year: 2015

A series of high-performance photocatalysts of Ag3PO4-WO3/multi-walled carbon nanotubes (MWCNTs) were fabricated through a deposition-precipitation method. Their structures and physical properties were characterized by means of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), specific surface analyzer, X-ray diffraction (XRD), UV-vis absorption spectra, photoluminescence spectra (PL) and X-ray photo-electron spectroscopy (XPS). SEM, EDS and TEM analyses verified that Ag3PO4-WO3/MWCNTs composites have been successfully prepared. PL analysis illustrated that Ag3PO4-WO3/MWCNTs have the lower emission peak intensities, compared with Ag3PO4 and WO3. By using simultaneous decontaminations of Cr(VI) and orange II as model reactions, the photocatalytic efficiencies of Ag3PO4, WO3 and Ag3PO4-WO3/MWCNTs were evaluated. The reaction results showed that Ag3PO4-WO3/MWCNTs have strong photocatalytic activities. The effect of Ag3PO4:WO3 ratio on the photocatalytic activity was systemically studied. The catalyst AWM7/3 was found to exhibit the highest photocatalytic activity and excellent chemical stability in repeated and long-term applications. The improvement of photocatalytic activity and stability was mainly attributed to the highly effective separation of photo-generated electron-hole pairs and special transfer pathway of electrons and holes in Ag3PO4-WO3/MWCNTs composites. Therefore, the prepared Ag3PO4-WO3/MWCNTs could act as a high-performance catalyst for the simultaneous decontaminations of Cr(VI) and orange II, and also suggested the promising applications. © 2015 Elsevier B.V. All rights reserved.

Wang D.,Southwest Jiaotong University | Wang D.,Key Laboratory of Special Waste Water Treatment | Liu D.,Southwest Jiaotong University | Tao L.,Southwest Jiaotong University
Chinese Journal of Environmental Engineering | Year: 2014

To provide certain theoretical basis for selecting optimal recirculation landfill scientifically and reasonably, comprehensive evaluation of leachate concentrate recirculation landfill based on the grey analytic hierarchy process was researched. Firstly, the hierarchical structure model and evaluation index of grey analytic hierarchy process were constructed and the weights were calculated. Secondly, the evaluation index matrix was established based on the grey correlation theory. And then, the comprehensive evaluation matrix was established. This method was applied for the evaluation of different landfill ages which were one year, five years and fifteen years. The results showed that the correlation degree between the fifteen years recirculation landfill and ideal scheme was the largest, which is followed by the five years and the one year. So the fifteen years recirculation landfill was the best.

Zhao L.,Sichuan Normal University | Zhao L.,Key Laboratory of Special Waste Water Treatment | Zhao J.,Sichuan Normal University | Sun X.,Sichuan Normal University | And 4 more authors.
Synthetic Metals | Year: 2015

Abstract In the present work, we prepare hybridized conducting aerogels based on multi-walled carbon nanotubes (MWCNTs) and carbonized resorcinol-formaldehyde (RF) resin. We find that incorporation of MWCNTs into the hybridized conducting aerogels simultaneously increases the electrical conductivity and the Seebeck coefficient, and at the same time depresses the thermal conductivity. It demonstrates that the three thermoelectric parameters can be independently tuned in the unique structures of hybridized conducting aerogels, which provides a potential way to overcome the challenge in bulk semiconductors that increasing electrical conductivity is generally accompanied with decreased Seebeck coefficient and increased thermal conductivity. As a result, the hybridized conducting aerogels show an improvement of two orders of magnitude in the figure of merit (ZT), compared with that of pure carbonized RF aerogel. © 2015 Elsevier B.V. All rights reserved.

Zhao L.,Sichuan Normal University | Zhao L.,Key Laboratory of Special Waste Water Treatment | Sun X.,Sichuan Normal University | Lei Z.,Sichuan University | And 5 more authors.
Composites Part B: Engineering | Year: 2015

In this work, we presented that the Seebeck coefficient and electrical conductivity can be increased simultaneously in aerogels based on graphene and multi-walled carbon nanotube (graphene-MWCNT) nanocomposites, and at the same time the thermal conductivity is depressed due to 3D porous skeleton structure. As a result, graphene-MWCNT aerogels possess ultra-low thermal conductivities (∼0.056 W m-1 K-1) and apparent density (∼24 kg m-3), thereafter the figure of merit (ZT) of ∼0.001 is achieved. Although the ZT value is too low for practical application as a thermoelectric (TE) material, the unique structure in this project provides a potential way to overcome the challenge in bulk semiconductors that increasing electrical conductivity generally leads to decreased Seebeck coefficient and enhanced thermal conductivity. © 2015 Elsevier Ltd. All rights reserved.

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