Research Of Synthesis And Photocatalytic Properties On ZnO Nanostructures And Bi Doping

Nanometer ZnO can present some properties that common materials can not because ofits volume effect, surface effect, quantum size effect and dielectric confinement effect, andalso it has been widely used in biomedical, paint industry, household products etc.,especially in eliminating environmental pollution problems. Its light catalytic performancehas become a hot spot in the study of international experts. Under the light irradiation,organic pollutants take place oxidation-reduction by the function of Nanometer ZnO, andthen gradually been degraded,and ultimately be completely oxidated into CO₂, H₂O andnon-toxic inorganic small molecule which all are environmental-friendly. This provides anew train of thought to control organic pollutants.（1） This paper has successfully prepared bismuth doped ZnO microspheres structure onthe basis of using Hydrothermal method to prepare ZnO nanometer ball. This paper, withmethyl orange solution for the target, researched the zinc oxide nanometer ball and bismuthdoped ZnO microspheres’s influence on the light catalytic degradation of methyl orange.（2） By changing the temperature and time, to explore the degradability influence ofZnO samples grown in different conditions to methyl orange. on this basis, and then bychanging the temperature, bismuth doping concentration and other experimental parameters,to explore the light catalytic performance of bismuth doping ZnO samples in differentgrowing condition to methyl orange and then to find out the best experimental conditions forbismuth doping ZnO. Through the scanning electron microscope, X-ray diffraction spectrumand other representation method to analyze the morphology, material composition ofaccquired samples, combined with the light catalytic efficiency of product, to deeplyresearch growth mechanism and light catalytic mechanism of nano zinc oxide.By comparing the light catalytic performance of bismuth doping ZnO grown indifferent processes, draw the following conclusion:（1） Extension of time will contribute to the growth of ZnO microspheres, which doesn’thave too big effect on the surface of ZnO microsphere.Increasing of the water hottemperature will lead to part of the nanometer ZnO microspheres rupture, and size will bedeclined. （2） The photo-catalyzed efficiency of Bismuth-doped ZnO is obviously higher than thatof no doping Bismuth.（3） In the temperature of90°C and the reaction time is3hours, Zn（NO₃）₂6H₂Oconcentration is0.002mol/L, C₆H₍120N₄concentration is0.002mol/L, Na₃C₆H₅O₇·2H₂O is0.0025mol/L, Bi₂（NO₃）₃.5H₂O concentration is0.0001mol/L. under the condition ofbismuth ions doping ratio is5%conditions, ZnO microspheres can degradate1×10^-5mol/Lof methyl orange solution ion into25%in4hours.