Using TiOSO4 and iron as materials,a light catalyst with diameters varying between 40 to 70nm has been synthesized through the SAS process and is utilized to degrade a pharmaceutical wastewater.Under different conditi...Using TiOSO4 and iron as materials,a light catalyst with diameters varying between 40 to 70nm has been synthesized through the SAS process and is utilized to degrade a pharmaceutical wastewater.Under different conditions of combustion temperatures,sample pH values of sample,mole ratios of the mixed iron and stirring mode with aeration or supersonic wave as well as magnetic,the degradation effects on COD removal from the wastewater has been investigated.The nano-TiO2 has shown a higher catalytic activation at 600℃,and the removal rate of 80% or 72% is reached under conditions of pH of 4.5 and 3h of radiation with UV or sunshine respectively,while at pH of 2.0,the same treatment give 83% or 78% removal rate respectively.Under conditions of sunshine,600℃ and pH of 4.5,the nano-TiO2 mixed with iron of 0.8% get removal of 85%.The stirring mode has an influence on the COD removal,under the above conditions,stirring with aeration for 20min get a higher removal of 19% or 10% than that with supersonics wave or magnetic power,but after 40min,stirring with magnetic power get the highest removal rate.展开更多
The KxNa1-xNbO3 nanopowders with cubic-like morphology and an average size of about 50 nm were synthesized by sol-gel auto-combustion method.And then,the ceramics were prepared and the phase transition,microstructure ...The KxNa1-xNbO3 nanopowders with cubic-like morphology and an average size of about 50 nm were synthesized by sol-gel auto-combustion method.And then,the ceramics were prepared and the phase transition,microstructure and electrical properties of the KxNa1-xNbO3 ceramics were investigated.Pure perovskite phases of the KxNa1-xNbO3 ceramics were confirmed by XRD patterns and the K0.50Na0.50NbO3 ceramics show the coexistence of orthorhombic and monoclinic structures.SEM micrographs show that all samples have bimodal grain size distributions and the number of the small grains decrease with increasing K+content in the bimodal grain size distribution system.The K0.50Na0.50NbO3 ceramics with the uniform grain size and the maximum density show excellent electrical properties withεr=467.40,tanδ=0.020,d33=128 pC/N and kp=0.32 at the room temperature,demonstrating that the properties of the K0.50Na0.50NbO3 powers prepared by sol-gel auto-combustion are excellent and the ceramics are promising lead-free piezoelectric materials.展开更多
文摘Using TiOSO4 and iron as materials,a light catalyst with diameters varying between 40 to 70nm has been synthesized through the SAS process and is utilized to degrade a pharmaceutical wastewater.Under different conditions of combustion temperatures,sample pH values of sample,mole ratios of the mixed iron and stirring mode with aeration or supersonic wave as well as magnetic,the degradation effects on COD removal from the wastewater has been investigated.The nano-TiO2 has shown a higher catalytic activation at 600℃,and the removal rate of 80% or 72% is reached under conditions of pH of 4.5 and 3h of radiation with UV or sunshine respectively,while at pH of 2.0,the same treatment give 83% or 78% removal rate respectively.Under conditions of sunshine,600℃ and pH of 4.5,the nano-TiO2 mixed with iron of 0.8% get removal of 85%.The stirring mode has an influence on the COD removal,under the above conditions,stirring with aeration for 20min get a higher removal of 19% or 10% than that with supersonics wave or magnetic power,but after 40min,stirring with magnetic power get the highest removal rate.
基金Project(21501007)supported by the National Natural Science Foundation of ChinaProject(2016GY-226)supported by the Industrial Science and Technology Plan in Shaanxi Province of China+1 种基金Project(ZK15044)supported by the Doctoral Scientific Research Starting Foundation of Baoji University of Arts and Sciences,ChinaProject(201610721039)supported by Undergraduate Training Programs for Innovation and Entrepreneurship,China
文摘The KxNa1-xNbO3 nanopowders with cubic-like morphology and an average size of about 50 nm were synthesized by sol-gel auto-combustion method.And then,the ceramics were prepared and the phase transition,microstructure and electrical properties of the KxNa1-xNbO3 ceramics were investigated.Pure perovskite phases of the KxNa1-xNbO3 ceramics were confirmed by XRD patterns and the K0.50Na0.50NbO3 ceramics show the coexistence of orthorhombic and monoclinic structures.SEM micrographs show that all samples have bimodal grain size distributions and the number of the small grains decrease with increasing K+content in the bimodal grain size distribution system.The K0.50Na0.50NbO3 ceramics with the uniform grain size and the maximum density show excellent electrical properties withεr=467.40,tanδ=0.020,d33=128 pC/N and kp=0.32 at the room temperature,demonstrating that the properties of the K0.50Na0.50NbO3 powers prepared by sol-gel auto-combustion are excellent and the ceramics are promising lead-free piezoelectric materials.
