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Ha Thi Thu Vu,Hanh Thi Vinh Le,Yen Thi Hai Pham,Hung Quoc Le,Phong Hong Pham 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.3
Different kinds of materials for electrodes based on glassy carbon, carbon fibers, and modified by an ionic liquid (BMIMBF4) were used to determine 2,4,6-trinitrotoluene (TNT) in water environment by differential pulse adsorptive stripping voltammetry. The modified electrode based on BMIMBF4 showed a better performance than those based on the microelectrode and glassy carbon electrode (GCE) in term of sensitivity. The best performance was obtained with the ionic liquid-modified electrode with 80:10:10 (w/w/w) of the graphite powder/paraffin oil/BMIMBF4 composition in PBS, pH 8. The TNT concentration was linear in the range 1.5 to ~30 ppm for all studied electrodes (r = 0.9978) with a detection limit of 88.6 ppb using IL-CPE (ionic liquid-modified carbon paste electrode). This latter electrode was used to measure real samples taken from Red River, Vietnam. The recovery study for TNT in natural samples gave values from 99.7% to 103.3%. IL-CPE demonstrated long-term stability and reproducibility, with a relative standard deviation of 1.67%.
Climate Change Issues of Paper Manufacturing Production at Phong Khe Craft Village
Ha, Vu Thi Hong,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.1
Today, the development of industries and rapid urbanization has a profound impact on the human environment. It can be said that the environment in the craft village is most affected. The environment in these areas is severely degraded and depending on the type of production, the environment in the craft villages is different. In Phong Khe ward of Bac Ninh Province, Vietnam, there are over 204 small and large facilities of recycling and producing paper. The paper facilities produce about 200,000 tons of paper each year and the amount of paper produced is not less than 500 tons each day in Phong Khe. They are creating livelihoods for more than 6,000 workers and generating local budgets from VND- 50 billion to VND 60 billion per year. Despite this great contribution, the use of old machines and "backward" modes of production means that paper recycling has caused serious air, soil, and water pollution in the region. The specific objectives of this study were as follows: (1) provide an overview of paper production process in the Phong Khe paper craft village; (2) comprehensive literature review of the current status of water environment, atmosphere environment, soil environment and solid waste; (3) figure out about waste treatment in Phong Khe ward.
Thi Vu, Hong Ha,Atabaev, Timur Sh.,Ahn, Ji Young,Dinh, Nguyen Nang,Kim, Hyung-Kook,Hwang, Yoon-Hwae The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.20
<▼1><P>Phosphor particles were introduced as a luminescent medium to improve the overall efficiency of dye sensitized solar cells (DSSCs).</P></▼1><▼2><P>Phosphor particles were introduced as a luminescent medium to improve the overall efficiency of dye sensitized solar cells (DSSCs). In the preparation process, TiO2 and phosphor particles were mixed to make photoelectrodes with bilayer (TiO2/mix), 3-layer (TiO2/mix/TiO2) and 4-layer (TiO2/mix/TiO2/mix) structures. The cell with the bilayer structure (TiO2/mix) after treating with TiCl4 solution showed the highest light-to-electric energy conversion efficiency (8.78%), which was ∼25.8% higher than that of a cell with a pure TiO2 layer under the same experimental conditions. The improvement in the energy conversion efficiency of DSSCs was attributed to phosphor enhanced incident light-harvesting <I>via</I> up- and down-conversion luminescence processes, resulting in an increase in the photocurrent.</P></▼2>
Vu, Hong Ha Thi,Hwang, Yoon-Hwae,Kim, Hyung-Kook Korea Photovoltaic Society 2016 Current Photovoltaic Research Vol.4 No.2
Increasing the efficiency of dye-sensitized solar cells (DSSCs) by the fabrication of new photoelectrodes (PEs) is an important challenge. This study examined the photovoltaic parameters of DSSCs composed of a $TiO_2$ PE with $WO_3$ nanoparticles (NPs). A number of PEs with the same thickness but different concentrations of $WO_3$ NPs in the $TiO_2PE$ were prepared. The morphology and structural properties of the prepared PEs were examined by field-emission scanning electron microscopy and X-ray diffraction, respectively. The effects of the $WO_3$ NPs mixing concentration on the efficiency of DSSCs were investigated under simulated solar light irradiation.
The Effects of WO₃ Nanoparticles Addition to the TiO₂ Photoelectrode in Dye-Sensitized Solar Cells
Hong Ha Thi Vu,Yoon-Hwae Hwang,Hyung-Kook Kim 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.2
Increasing the efficiency of dye-sensitized solar cells (DSSCs) by the fabrication of new photoelectrodes (PEs) is an important challenge. This study examined the photovoltaic parameters of DSSCs composed of a TiO₂ PE with WO₃ nanoparticles (NPs). A number of PEs with the same thickness but different concentrations of WO₃ NPs in the TiO₂PE were prepared. The morphology and structural properties of the prepared PEs were examined by field-emission scanning electron microscopy and X-ray diffraction, respectively. The effects of the WO₃ NPs mixing concentration on the efficiency of DSSCs were investigated under simulated solar light irradiation.