CAJ | 학술논문

采用H2S硫化的方法合成硫氧化物La3NbS2O5，并通过X射线衍射(XRD)、紫外?可见漫反射(DRS)、场发射扫描电镜(FE-SEM)等技术对其进行表征和分析，研究硫化条件与光催化分解水产氢活性的关系。结果表明：与传统固相法比较，硫化法使La3NbS2O5在更低的温度和更短的反应时间(1 h)合成；合成的La3NbS2O5粒子呈规则的盘子状，粒径为0.1?0.6μm，粒子表面光滑；在1073 K硫化1 h制得的La3NbS2O5具有极高的产氢活性，大约为固相法制得La3NbS2O5的产氢活性的1.83倍。
채용H2S류화적방법합성류양화물La3NbS2O5，병통과X사선연사(XRD)、자외?가견만반사(DRS)、장발사소묘전경(FE-SEM)등기술대기진행표정화분석，연구류화조건여광최화분해수산경활성적관계。결과표명：여전통고상법비교，류화법사La3NbS2O5재경저적온도화경단적반응시간(1 h)합성；합성적La3NbS2O5입자정규칙적반자상，립경위0.1?0.6μm，입자표면광활；재1073 K류화1 h제득적La3NbS2O5구유겁고적산경활성，대약위고상법제득La3NbS2O5적산경활성적1.83배。
The oxysulfide La3NbS2O5 was synthesized by sulfurization using H2S and characterized by X-ray diffraction (XRD), UV?Vis diffuse reflectance spectroscopy (DRS) and field emission scanning electron microscopy (FE-SEM). The relationship between the sulfurization conditions and the photocatalytic activities for H2 evolution was investigated. Sulfurization method allowed for synthesis of La3NbS2O5 at much lower temperatures and significantly shortened reaction time of 1 h compared with conventional solid-state techniques. The particle morphologies were regular platelike with sizes of 0.1?0.6μm and smooth surfaces. The highest activity for H2 evolution was obtained at 1073 K for 1 h, which was about 1.83 times that of La3NbS2O5 prepared by solid-state method.