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Experimental Study on Thermal Catalytic Degradation of SF6 Waste Gas by Metal Phosphate
Zhang Xiaoxing,Li Xiaohan,Wang Yi,Meng Fei,Zou Yi,Tian Shuangshuang,Cui Zhaolun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
In recent years, SF6 has been widely used in the electrical industry. The amount of SF6 waste gas produced by the corresponding gas insulated equipment is increasing year by year. However, SF6 has high global warming potential and long atmospheric life. Proper treatment of SF6 waste gas is particularly important for environmental protection. Thermal degradation can effectively eliminate the greenhouse effect caused by direct emission of SF6. In this paper, AlPO4, Zr3(PO4)4 and CePO4 were used as catalysts to degrade SF6/air mixture gas (The concentration of SF6 is 15%) at 800 °C. The concentration of SF6 gas was detected by gas chromatography (GC), and the gas decomposition products of SF6 were detected by gas chromatography mass spectrometry (GCMS) and fourier transform infrared spectroscopy (FTIR). The surface morphology and composition of the catalyst were analyzed by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that the three kinds of metal phosphates can promote the decomposition of SF6 gas, among which CePO4 had the best catalytic degradation effect, and the degradation rate of SF6 reached 84.7% in 12 h. The main products of SF6 gas thermal catalytic degradation include SF4, S2F10, SO2F2, SOF2, SiF4 and SO2 gas, etc. SEM scanning image shows that there were some objects adsorbed on the surface of CePO4 catalyst after the experiment. XPS spectra showed that Si and F elements were added to the catalyst. According to the binding energy, SiF4 was adsorbed on the catalyst. After the experiment, CeF3 was produced by CePO4 catalyst. Different catalysts have their own selectivity to the decomposition products of SF6, which is convenient for the treatment of products, and it is of great significance to eliminate the greenhouse effect caused by the waste gas of SF6.
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SF6 abatement in a packed bed plasma reactor: Role of zirconia size and optimization using RSM
Yuan Tian,Xiaoxing Zhang,Yufei Wang,Zhaolun Cui,Ju Tang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
This work describes plasma destruction of SF6 in a zirconia (ZrO2) packed bed plasma reactor (PBR). Electric signals, equivalent parameters, emission spectra and degradation results have been utilized toevaluate the influence of ZrO2 size on PBR discharge characteristics and SF6 degradation. The resultspresent that the size of ZrO2 has a significant impact on PBR discharge characteristics due to its influenceon physical parameters. Moreover, bigger ZrO2 beads packing shows a better performance in SF6degradation because of longer gas residence time. In addition, the key operating parameters includingflowrate, SF6 concentration, oxygen concentration, and water vapor concentration were optimized byresponse surface methodology (RSM) with Box-Behnken design (BBD). The proposed optimization modelshows satisfactory correlation between the predicted and actual results. For energy yield (EY), the mutualeffect offlowrate, SF6 concentration and water vapor concentration was significant. For SO2F2 selectivity,the mutual effect of SF6 concentration and water vapor concentration was significant. The optimum SF6abatement was predicted from RSM as 14.64 g/kWh and 14.42% for EY and SO2F2 selectivity atflowrate of200 mL/min, SF6 concentration of 3%, oxygen concentration of 0.83% and water vapor concentration of1.89%.
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Ying Tang,Lei Liu,Jinju Han,Zhaolun Zhang,Shuyan Yang,Shuxian Li,Shuxian Li,Zhanhua Fan,Hua Zhao 한국섬유공학회 2021 Fibers and polymers Vol.22 No.2
Herbal extracts have recently received considerable interest in acne therapy owing to their enhanced skincompatibility compared with antibiotics and synthetic agents. In this study, electrospun poly (vinyl alcohol)/chitosan (PVA/CS) fibrous patch incorporating a combination of herbal extracts with complementary mechanisms of action was developedas an alternative acne therapy for patients with resistance to the conventional treatments. The herbal extracts-loadedelectrospun fibers displayed uniform and smooth-surfaced nanofibers (dia. 100-300 nm), high drug loading efficiency (89.5-97.7 %) and good water absorbing properties. Results of the in vitro release and antibacterial studies suggest the patches arecapable of sustained release of polyphenol-rich extracts, which may, together with the chitosan present in the fiber, endow thepatch with potent bacterial inhibition of Propionibacterium acnes. The herbal extracts-loaded patches exhibited pronouncedclinical therapeutic efficacy in treating mild-to-moderate facial acne by rapidly reducing inflamed lesions and restoringepidermal barrier. Also, the herbal patches demonstrated improved biocompatibility or tolerability in comparison with thesynthetic drug benzoyl peroxide. Overall, the present study has provided a facile approach to develop biocompatiblepolymers based electrospun fibrous patch for the efficient delivery of herbal extracts for topical skin therapy, opening newperspectives for a new generation of cosmetotextiles.
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RBPJ contributes to acquired docetaxel resistance in prostate cancer cells
Li Xue,Zhenlong Wang,Hecheng Li,Zhaolun Li,Qi Chen,Peng Zhang,Haiwen Chen,Ziming Wang,Tie Chong,T. Chong 대한독성 유전단백체 학회 2017 Molecular & cellular toxicology Vol.13 No.3
Our previous work has shown that depletion of recombination signal-binding protein J (RBPJ) results in reduced cell growth in prostate cancer cells. In this study, we aimed to investigate the function of RBPJ in the chemoresistance of prostate cancer. The expression of RBPJ was quantified in docetaxel-resistant and parental prostate cancer cells. Loss- and gainof- function experiments were conducted to explore the regulatory role of RBPJ in prostate cancer sensitivity to docetaxel. The pro-apoptotic effect of RBPJ silencing was checked in docetaxel-resistant prostate cancer cells. We found that docetaxel-resistant PC3-DR and DU145- DR cells expressed 3-5-fold high levels of RBPJ than parental PC3 and DU145 cells. Short hairpin RNAmediated knockdown of RBPJ inhibited cell proliferation and colony formation and reversed docetaxel resistance in docetaxel-resistant prostate cancer cells. In contrast, overexpression of RBPJ promoted cell growth, colony formation, and docetaxel resistance in parental prostate cancer cells. Downregulation of RBPJ induced apoptosis in docetaxel-resistant cells, which was accompanied by enhanced cleavage of caspase-3. In addition, RBPJ silencing or overexpression markedly modulated the expression of the Bcl-2 family members including Bcl-2, Bcl-xL, Mcl-1, Bax, and Bak. Altogether, RBPJ contributes to acquisition of docetaxel resistance in prostate cancer cells and may thus represent a potential target for overcoming chemotherapeutic resistance in this malignancy.
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