CAJ | 학술논문

本文以醋酸锌、浓氨水为原料,采用均匀沉淀法,制备了在太阳光下具有优良光催化性能的纳米氧化锌粉体,并利用透射电镜(TEM)、UV-Vis、X射线衍射(XRD)和ξ电位对所得样品进行了表征;以亚甲基蓝(MB)溶液的光催化脱色降解为模型反应,考察了煅烧温度对其结构与催化性能的影响.研究结果表明:在·150℃下煅烧4 h得到了具有良好分散性和结晶性能的纳米氧化锌粒子,粒径分布均匀、平均粒径约10 nm;该纳米材料在太阳光下具有高的光催化活性和稳定性,照射2h可以使MB溶液的脱色率达100%,且重复使用5次时染料的脱色率仍在95%以上;所得样品的ξ电位均为负值,样品表面过剩的负电荷源自于样品的结构缺陷,即Zn~(2+)空位或O~(2-)过剩,且表面电荷量随煅烧温度的不同而不同;结构缺陷是其光谱响应范围的拓展和在太阳光条件下具有良好催化性能等的重要原因.
본문이작산자、농안수위원료,채용균균침정법,제비료재태양광하구유우량광최화성능적납미양화자분체,병이용투사전경(TEM)、UV-Vis、X사선연사(XRD)화ξ전위대소득양품진행료표정;이아갑기람(MB)용액적광최화탈색강해위모형반응,고찰료단소온도대기결구여최화성능적영향.연구결과표명:재·150℃하단소4 h득도료구유량호분산성화결정성능적납미양화자입자,립경분포균균、평균립경약10 nm;해납미재료재태양광하구유고적광최화활성화은정성,조사2h가이사MB용액적탈색솔체100%,차중복사용5차시염료적탈색솔잉재95%이상;소득양품적ξ전위균위부치,양품표면과잉적부전하원자우양품적결구결함,즉Zn~(2+)공위혹O~(2-)과잉,차표면전하량수단소온도적불동이불동;결구결함시기광보향응범위적탁전화재태양광조건하구유량호최화성능등적중요원인.
ZnO nanoparticles with good photocatalytic property under solar light were prepared by cooperation-precipitation method with zinc acetate and ammonia as raw materials.The as-made samples were characterized by TEM,UV-Vis,XRD and ξ potential measurement.Decolorizing of MB dye solution as the model reaction,the effect of calcining temperature on the structure and catalytic property of the samples was examined.Results showed that ZnO nanoparticles with well-dispersion and crystal property,obtained by calcining the precursor at 150 ℃ for 4 h,had the average diameter of about 10 nm,the even particle size distribution,and higher photocatalytic property under solar light.After being illuminated for 2 h under solar light,the decolorizing efficiency of the MB solution reached 100% and the efficiency remained above 95% after being reused for five times.The ξ potential of the samples was negative.Excess negative charge on its surface was related to the structure defect,that was Zn~(2+) vacancy or O~(2-) excess.And charge quantity changed with calcining temperature.The structure defect was a very important factor of extending the light response of ZnO nanoparticles and improving catalytic property of the samples under solar light.