CAJ | 학술논문

以玉米秸秆为模板,采用溶胶-凝胶法制备N掺杂FeVO4光催化剂,采用 X射线衍射(XRD)、扫描电镜(SEM)、比表面积分析(BET)、X射线光电子能谱(XPS)、紫外-可见吸收光谱(UV-Vis)等测试、分析手段,对样品进行表征。在可见光照射下,通过光催化降解甲基橙溶液评价N 掺杂对 FeVO4光催化剂活性的影响。结果表明,掺杂 N 前后 FeVO4均为三斜型, N取代了 FeVO4晶格中 O 形成了 N-Fe-O 键,产生了杂质能级,N掺杂导致FeVO4表面形成了大量束缚单电子的氧空位,产生缺陷能级,二者共同作用致使带隙窄化,光吸收带红移。光催化降解结果表明,N 掺杂能有效提高 FeVO4的可见光催化活性。当掺杂 N为15%(摩尔分数)时,样品活性最高,光照100 min对甲基橙的脱色率达56%左右,远高于未掺杂的脱色率(16.7%)。
이옥미갈간위모판,채용용효-응효법제비N참잡FeVO4광최화제,채용 X사선연사(XRD)、소묘전경(SEM)、비표면적분석(BET)、X사선광전자능보(XPS)、자외-가견흡수광보(UV-Vis)등측시、분석수단,대양품진행표정。재가견광조사하,통과광최화강해갑기등용액평개N 참잡대 FeVO4광최화제활성적영향。결과표명,참잡 N 전후 FeVO4균위삼사형, N취대료 FeVO4정격중 O 형성료 N-Fe-O 건,산생료잡질능급,N참잡도치FeVO4표면형성료대량속박단전자적양공위,산생결함능급,이자공동작용치사대극착화,광흡수대홍이。광최화강해결과표명,N 참잡능유효제고 FeVO4적가견광최화활성。당참잡 N위15%(마이분수)시,양품활성최고,광조100 min대갑기등적탈색솔체56%좌우,원고우미참잡적탈색솔(16.7%)。
N-doped FeVO4 photocatalysts were successfully prepared via sol-gel method with the corn stem as template.The samples were characterized by X-ray diffraction (XRD),scanning electron microscope(SEM), specific surface area(BET),X-ray photoelectron spectroscopy (XPS)and UV-Vis absorption spectroscopy(UV-Vis).The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO)solution under visible light.The results showed that all the FVO or N/FVO photocatalysts were consisted of triclinic phase.The enhanced photocatalytic activity was ascribed to a synergic effect of impurity energy levels due to the substitutional N-doping forming the N-Fe-O bonding structures and defect energy levels resulted from the formation of oxygen vacancies,which result in the band gap narrowing and red-shift of optical absorption band. The appropriate amount of N doping can signifcantly increase the photocatalytic activity and the highest photo-catalytic degradation rate can be about 56% in 100 min when then doping amount was 15%,which was 40% or so than that of pure FeVO4 under visible light irradiation.