| With the development of economy,the issue of energy and resources has been gradually attracted people’s attention.In order to adapt to the new environment and solve new problem,the research of new energy-saving inorganic materials gradually started.In this experiment,the preparation and research of compounds,Fe/N co-doped MgTiO3 and Mn/N co-doped ZnAl2O4 have been done.The samples have been synthesized by Sol-Gel method and ammonolysis.Performance testing mainly adopts synchronous thermal analyzer(TG-DSC),X-ray diffraction analyzer(XRD),Fourier transform infrared spectroscopy(FTIR),high resolution scanning electron microscopy(FE-SEM)and colorimeter(Lab),High resolution transmission electron microscopy(TEM/HR-TEM),X-ray photoelectron spectroscopy analyzer(XPS),UV-vis-NIR spectrophotometer(UV-vis-NIR),box simulation and infrared thermal camera,which are used to carry out the detailed research,analysis and evaluate the preperation of compounds,crystal structure,particle size and distribution,surface morphology,characteristics of color,element type,reflective performance,thermal performance and energy saving performance.The results show that:(1)800℃ is best temperature to form Fe/N co-doped MgTiO3 particles.The doping of Fe/N does not change the main hexagonal structure of MgTiO3 phase(the space group,R3).The particles of synthesized compounds are of uniformly distributed diameters(200-400 nm)and display spherical shapes.(2)700 ℃ is best temperature to form Mn/N co-doped ZnAl2O4 particles.The doping of Mn/N does not change the main cubic structure of ZnAl2O4 phase(the space group,Fd-3m(227)).The particles of synthesized compounds are of uniformly distributed diameters(80-100 nm)and display spherical shapes.(3)In the region of 800-2500 nm,the NIR reflectance and the NIR solar reflectance of powdered compounds(Fe/N co-doped MgTiO3)are 93%-65%and 88.58%-53.51%,respectively.And the NIR reflectance and the NIR solar reflectance of corresponding coatings are 96%-37%and 74.93%-44.94%,respectively.Meanwhile,absorption edges of samples red shift toward long-wavelength region from 494 nm to 557 nm,and the corresponding band gaps distribute between 2.11ev and 1.89ev.The interior air temperature of boxes presents that the difference of temperature stabilized at 2.3-3.2℃.Infrared images of coatings shows the difference of temperature of aluminum plate back surface keep between 2.4℃ and 8.6℃.Under the light of a lamp,the surface temperature increases and the obvious difference appear after a few minutes.(4)In the region of 800-2500 nm,the NIR reflectance and the NIR solar reflectance of powdered compounds(Mn/N co-doped ZnAl2O4)are 94%-20%and 90.85%-30.62%,respectively.And the NIR reflectance and the NIR solar reflectance of corresponding coatings are 87%-15%and 60.99%-11.56%,respectively.Meanwhile,absorption edges of samples red shift toward long-wavelength region from 370 to 665nm,and the corresponding band gaps distribute between 3.33ev and 2.90ev.The interior air temperature of boxes presents that the difference of temperature stabilized at 1.4-6.70C.Infrared images of coatings indicates the temperature of aluminum plate back surface(Mn/N co-doped ZnAl2O4(x=0.3)coating)shows an increasing process and finally tends to a stable value(58.2℃).By comparison,temperature of conventional pigment coating finally risen to 63.9℃,and the difference of temperature stabilized at 5.7℃.Under the light of a lamp,the surface temperature shows an increasing process.The temperature of aluminum plate surface(Mn/N co-doped ZnAl2O4(x=0.3)coating)shows an increasing process and finally tends to the value of 40.28℃.However,temperature of conventional pigment coating one is 49.46℃,and the difference of temperature stabilized at 9.18 ℃.(5)According to the power plant,per megawatt of electricity needs discharge 563 kg CO2,17 g of NOx and 14 g SOx,which can be achieved by conserving electricity and reducing the amount of greenhouse gases and harmful gases,and ultimately assessing the energy saving properties of the material.Fe/N co-doped MgTiO3(x = 0.3)coating can save energy by 2.45GWh/yr and reduce 1379.35 tons/yr of CO2,41.65 tons/yr of NOx,34.30 tons/yr of SOx emissions;Mn/N co-doped ZnAl2O4(x = 0.3)coating can save up to 24.61 GWh/yr,and can reduce emissions by 1.39 × 104 tons/yr of CO2,41.45 tons/yr of NOx,and 344.60 tons/yr of SOx.Box simulation and results illustrates that the prepared compounds could be used in the coatings and have excellent energy-saving effect.In this work,the preparation and research of this kind of powder sample is valuable in the field of heat reflection,also provides ideas for energy saving. |
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