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Liu B.,Lanzhou University | Hou F.,Lanzhou University | Du Y.,Gansu Natural Energy Research Institute
2011 International Conference on Multimedia Technology, ICMT 2011 | Year: 2011

As a big province which owns many grasslands, the potential carbon sequestration of Qinghai province is very great. The strong (A2a) and weak (B2a) scenarios in global climate warming and drying scenarios, the climate in Qinghai Province is opposite to the climate of the global trends, taking on warm trend; The main subject of Qinghai grassland carbon is the alpine tundra categories, accounting for Qinghai Province the total area of potential grassland is 75.69%, the annual carbon potential is 87.22% of the potential carbon potential of grassland of Qinghai province. compared with nearly 50 years (1950-2000) ,the grassland area will show a decrease trend in Qinghai Province, the trend of increasing forest area, grassland area will be reduced respectively by 30.71% and 28.5%;In the future (2001-2050) A2a, B2a scenario in Qinghai Province on carbon sequestration potential of grassland decreased by 25.55% and 20.82%, The warm and humid trend of climate is conducive to increase total vegetation carbon sink, the subject is that the carbon sequestration of alpine tundra categories has a significant reduction, but temperate forests (it is cold temperate coniferous forest class in Qinghai province ) is characterized by increased carbon sink . © 2011 IEEE. Source

Shao K.,Northwest Normal University | Li J.,Northwest Normal University | An X.,Gansu Natural Energy Research Institute | Lei Z.,Northwest Normal University | Su B.,Northwest Normal University
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2014

Ag+/Ag/ZnO porous nano-structured fiber materials were prepared by the template-assisted two-steps method and characterized by thermogravimetric analysis(TG), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM) and UV-Vis spectroscopy(UV-Vis) techniques. The effect of modified silver amount(molar fraction, 0-1.5%) on the photocatalytic property of ZnO materials was studied by the degradation of methylene blue(MB) as the model reaction. The results show that the Ag+-Ag co-modified ZnO porous nano-structured fiber materials are successfully prepared via the template-assisted two-steps method and the Ag+-Ag co-modifification affects the photocatalytic performance of ZnO materials by affecting its cell structure and light adsorption property and morphology. Under the irradiation of visible light, the Ag+/Ag/ZnO porous nano-structured fiber materials showed better catalytic performance than pure ZnO and the catalytic perfrmace of Ag+/Ag/ZnO is related to the modified amount of Ag+-Ag. In this paper, the way of Ag+ and Ag for improving photocatalytic performance of the ZnO materials was discussed. And the obtained results are helpful to understand the photocatalytic phenomena and mechanisms on the multi-structured material. Source

Li Z.,East China University of Science and Technology | Zhang H.,East China University of Science and Technology | Ge X.,East China University of Science and Technology | Liang Y.,East China University of Science and Technology | And 5 more authors.
New Journal of Chemistry | Year: 2013

Reduced graphene oxide is modified with sulfanilic acid diazonium salt followed by copper(ii) chelating to form a Cu complex nanocomposite. Characterization by Raman spectroscopy, FTIR and EDS, XPS, cyclic voltammetry demonstrates the successful functionalization of the graphene surfaces. Electrodes that are prepared by drop-casting the suspended nanocomposite solution on interdigitated electrodes (IDE) are tested for a novel pulsed amperometric detection of a series of sulfurated organophosphorus (SOP) pesticides, parathion, fenitrothion and malathion. A linear relationship of the pulsed amperometric current to the logarithmic value of concentration of the three SOPs is demonstrated with a R2 value of ∼0.95 at the S-OP concentration range of 1 ppb to 104 ppb. Negligible amperometric currents are observed in the control experiments using diethyl ethylphosphonate (DEEP) and dimethyl methyl phosphonate (DMMP), or S2-, SO 3 2-, SO4 2- ions, suggesting sensing specificity to sulfurated compounds. © 2013 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. Source

Shi X.,East China University of Science and Technology | Li Z.,East China University of Science and Technology | Ge X.,East China University of Science and Technology | Yang C.,East China University of Science and Technology | And 6 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2012

We report a graphene-based nanocomposite prepared by noncovalently engineering reduced graphene oxide (rGO) with neutral red (NR). The water-soluble reduced graphene nanocomposite (rGO-NR) was well characterized by using X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), UV-vis spectroscopy, and 1HNMR spectroscopy; the results suggest a strong φ-φ interaction between the rGO and NR molecules. Fluorescence spectroscopy and electrochemistry studies indicate a direct electron transfer interaction among the graphene-NR hybrid, in which NR is electron donor and graphene is electron acceptor. The photocurrent generating property of this nanocomposite was confirmed from the photoelectrochemical measurements. The graphene-NR coated electrodes are capable of generating photocurrent under visible excitation. Such photocurrent generating nanocomposite provides potential application in optoelectronic devices. Copyright © 2012 American Scientific Publishers. Source

Li Z.,East China University of Science and Technology | Shi X.-J.,East China University of Science and Technology | Ge X.-P.,East China University of Science and Technology | Wei J.-J.,East China University of Science and Technology | And 4 more authors.
Chemical Research in Chinese Universities | Year: 2012

The electron interaction among the noncovalently engineered graphene-methylene blue(MB) nanocomposite with a dipolar pull-push hybrid model was studied. The π-π interaction between reduced graphene oxide(rGO) and MB molecule was studied by 1HNMR spectroscopy. The electrochemical investigation indicates MB has a stronger electron transfer interaction with rGO than with GO. The ability of graphene-MB nanocomposites to undergo photoinduced electron transfer was confirmed from the capability of the nanocomposites coated electrode to generate photocurrent in a photoelectrochemical cell. The role of graphene as electron acceptor in the opto-electronic assembly was discussed. Source

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