摘要
采用热聚合法结合溶胶法制备了TiO_(2)改性g-C_(3)N_(4)异质结光催化材料。采用透射电子显微镜(TEM)、X射线衍射仪(XRD)、紫外-可见漫反射光谱仪以及光致发光(PL)光谱仪等对其结构和性能进行了表征,研究了其对有机染料亚甲基蓝(MB)溶液的光催化降解活性。结果表明,TiO_(2)颗粒分布在g-C_(3)N_(4)的片层表面与其形成稳固的异质结结构,g-C_(3)N_(4)和TiO_(2)之间具有强烈的协同作用,提高了光催化材料在可见光区域的响应强度,并且有效地阻止了光催化材料中光生电子和空穴的复合,大大提高了催化剂的光催化反应效率。在可见光照射下,3.0 g g-C_(3)N_(4)制备的异质结复合材料对MB的降解率可达90.3%,与纯g-C_(3)N_(4)相比光催化性能有显著提高。循环测试表明该异质结光催化材料具有很好的光催化稳定性。
TiO_(2) modified g-C_(3)N_(4) heterojunction photocatalytic materials were prepared by thermal polymerization method combined with sol method. The structures and properties of the photocatalytic materials were characterized by transmission electron microscope(TEM), X-ray diffractometer(XRD), ultraviolet-visible diffuse reflectance spectroscope and photoluminescence(PL) spectroscope. The photocatalytic activity of the g-C_(3)N_(4)-TiO_(2)heterojunction photocatalysis was investigated by degradation of methylene blue(MB). The results show that the TiO_(2)nano-particles are dispersed on the surface of g-C_(3)N_(4)with lamellar structure, and a stable heterojunction structure is formed with g-C_(3)N_(4). There is strong synergistic effect between g-C_(3)N_(4)and TiO_(2), which improves the response strength of the photocatalytic materials in visible light region, effectively prevents the recombination of photo-generated electrons and holes in the photocatalytic materials, and greatly improves the photocatalytic efficiency of the catalysts. Un-der the visible light, the degradation rate of MB by heterojunction composite materials prepared with 3.0 g g-C_(3)N_(4)is up to 90.3%, which is obviously higher than that of the pure g-C_(3)N_(4). Cyclic tests show that the heterojunction photocatalytic materials have good photocatalytic stability.
作者
刘威
张淑婷
卢秋莹
张家杰
Liu Wei;Zhang Shuting;Lu Qiuying;Zhang Jiajie(Key Laboratory for Biobased Materials and Energy of Ministry of Education,South China Agricultural University,Guangzhou 510642,China;College of Materials and Energy,South China Agricultural University,Guangzhou 510642,China)
出处
《微纳电子技术》
CAS
北大核心
2021年第12期1064-1070,共7页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(21207041)。
