以聚苯乙烯-丙烯酸羟乙酯共聚(P (St-HEA))微球为模板、钛酸四丁酯和硫脲为主要原料,制备了硫掺杂二氧化钛(S-TiO2)空心球,采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X 射线衍射仪(XRD)和X光电子能谱(XPS)表征产物的形貌、晶型以及硫元素的掺杂状态,并以甲醛溶液模拟废水,研究了S-TiO2空心球的紫外光催化性能.结果表明,煅烧去除了 P(St-HEA)微球模板,成功得到 TiO2空心球,硫元素掺杂对TiO2空心球的粒径和形貌影响不大.S-TiO2空心球锐钛矿型晶粒的尺寸缩小,晶型由纯的锐钛矿型转化为锐钛矿/金红石型混合晶型.硫脲引入的硫离子,以S4＋状态取代 TiO2晶粒中的 Ti4＋离子,形成 Ti1－x Sx O2固溶体.S-TiO2空心球光催化性能优于TiO2空心球,且空心球的光催化性能优于粉体P25.S-TiO2空心球在紫外光下照射2 h,降解甲醛的催化效率为60％.
Sulfur-doped titanium dioxide (S-TiO2 )hollow spheres were prepared by the reaction of tetrabutyl ti-tanate and thiourea as the main raw material with polystyrene-hydroxyethyl acrylate copolymer (P (St-HEA)) microspheres templates.The morphology,crystal type and state of elemental sulfur doping of S-TiO2 hollow spheres was characterized by scanning electron microscopy (SEM),transmission electron microscopy (TEM), X-ray diffraction (XRD)and X-ray photoelectron spectroscopy (XPS).Study the catalytic properties of S-TiO2 hollow spheres using methanal solution simulated wastewater.The results showed that TiO2 hollow spheres were obtained by removing P (St-HEA)microspheres template successfully,the particle size and morphology of TiO2 hollow spheres are little effected by sulfur-doping,the crystallite dimension of TiO2 hollow spheres di-minished and the crystal shape of TiO2 hollow spheres was changed from pure anatase into anatase/rutile.Sul-phur was present in the form of S4+ which substitutes Ti4+ in the titania lattice,forming Ti1-x Sx O2 solid solu-tion.The performance of photocatalysis of doped sample was superior to the pure TiO2 hollow spheres,while they both preceded TiO2 powder.The catalytic efficiency of synthesized photocatalyst was 60% for degrading methanal under UV-light.
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