Controlled synthesis of Sn doped ZnO microspheres stringed on carbon fibers with enhanced visible-light photocatalytic activities
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Field emission microscopy
Carbon fibers
Visible spectrum
Degradation
Methylene blue
To get CaTiO3catalyst with high photocatalytic properties,the effect of calcination conditions,on the photocatalytic activity of CaTiO3 was investigated.The calcination conditions included heating rate of calcination precursors,calcination temperature,calcination time and cooling rate of calcination products,The catalyst was synthesized by solid-state reaction method with Ca(NO3)2and TiO(OH)2as raw materials and NaOH as mineralizer.The physical properties of the catalyst were characterized using XRD and SEM.The experimental results showed that the activity increased until reached a maximum,and then decreased with the increasing heating rate of calcination precursors;the photocatalytic activity decreased drastically with the fast cooling rate of calcination products.Moreover,the optimal values of calcination temperature and calcination time were obtained.As a result,the CaTiO3catalysts with high photocatalytic activity can be obtained under an optimized calcination conditions after loading CoO(0.2 wt%)co-catalyst.
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Acrolein
Bismuth
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Three dimensional highly hierarchical flower-like Bi2WO6 microspheres, self aggregated from nanoplates, have been fabricated in a green hydrothermal way at low temperature, without using any template or setting a certain pH value in solution. We investigated the formation mechanism and also studied the visible-light-driven photocatalytic activities of the as obtained flower-like Bi2WO6 microspheres, which showed excellent performance for the degradation of an organic dye under visible light irradiation. Such a cost effective way to obtain well-organized flower-like Bi2WO6 microspheres has potential applications in water treatment by full use of solar light.
Visible spectrum
Degradation
Hydrothermal Synthesis
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In order to improve the activation effect of deactivation catalysts, calcination of V2O5-WO3-MoO3/TiO2 catalysts were investigated. The experimental results demonstrate that calcination time have an effect for recovering the activity of V2O5-WO3-MoO3/TiO2 catalyst. Calcination not only ensures the better mechanical strength and integrity of the catalyst, but also plays an important role in the denigration activity of the catalyst. However, the particles of the catalyst surface enlarged with the increase of the calcination temperature. The suitable calcination time can improve the denigration efficiency and increase the mechanical strength of the catalyst. In addition, the calcination time mainly affects the formation of MoO3. These findings can provide reference for the activation of SCR-Den Ox catalyst.
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Calcination rectorite(CREC) was obtained using the rectorite from Hubei Zhongxiang Mine.And setting the white degree and the residual sulfur content as the indices,the calcination conditions of rectorite were systematically seeked.Then CREC was characterized and thermally analyzed by XRD,SEM and TG-DTA,etc.The results suggested the optimum calcination condition was that the material granularity was less than 0.050 mm,the calcination temperature was 850 ℃,the rising temperature time was 4 h,the holding temperature time was 4 h.
Granularity
Characterization
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We calcined six kinds of limestone from various localities up to 900, 1000, 1100, 1200, 1300 and 1400°C with or without NaCl, and observed the growth of CaO crystals in their thin sections. The CaO crystals occurring in the specimens calcined with NaCl are, as usual, better grown than those without NaCl, and it is more evident at lower temperature calcination. In the case of higher temperature calcination, the formers are hardly over-burnt.With regard to the limestones, those of cryptcrystalline make finer CaO crystals. Especially it is evident at higher temperature calcination. This may show to have larger range for optimum calcination, that is easy to work with.
Atmospheric temperature range
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Atmospheric temperature range
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MoS2/TiO2 nanomaterial prepared by sol-gel process was characterized by XRD,UV-VIS-DRS,BET and so on.Meanwhile methylene blue(MB) was taken as the probe molecular to evaluate the visible light photocatalytic activity of the compound semiconductor materials.The effects of ration of MoS2 in composite catalyst,the initial concentration of methylene blue and the quantity of catalyst on the degradation rate of the methylene blue solution were investigated.The results show that the compound semiconductor materials exhibited the best photocatalytic activity being the decolorization proportion of methylene blue is 96.5% when the quantity of catalyst 0.5 g·L-1,the initial concentration of methylene blue is 0.284 mmol·L-1 under visible light.
Methylene blue
Visible spectrum
Methylene
Degradation
Nanomaterials
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Mg was extracted from boron mud through calcining method. The technological process is that the boron mud was calcined at 700 °C for 3 h then uniformly mixed with (NH 4 ) 2 SO 4 in proportion and calcined. The reaction process was studied by TG-DTA and XRD, which is that MgO in calcined boron mud reacts with (NH 4 ) 2 SO 4 to produce (NH 4 ) 2 Mg 2 (SO 4 ) 3 at low temperature, then with increasing the temperature, (NH 4 ) 2 Mg 2 (SO 4 ) 3 decomposes into MgSO 4 . The effects of calcination temperature, mol ratio of reaction substrates and calcination time on conversion rate of Mg were studied. The results indicate that the conversion rate of Mg increases with the increasing of calcination temperature first then decreases, increases with the increasing of calcination time and mol ratio of (NH 4 ) 2 SO 4 and MgO. When the calcination temperature is 500 °C, the calcination time is 3 h, the mol ratio of (NH 4 ) 2 SO 4 and MgO is 0.9:1, the conversion rate of Mg is 81.9 %.
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