A series of visible light photocatalysts of TiO 2 codoped with N and S (denoted as NS/TiO2 ) were prepared by facile grinding-calcination method with thiourea (TU ) as the source of sulfur and nitrogen and H 2 TiO3 (HT ) as the precursor of TiO2 .The crystal structure ,micro-morphology ,chemical state of typical elements ,and spectrometric properties of as-prepared NS/TiO2 photocatalysts were analyzed by means of X-ray diffraction ,transmission electron mi-croscopy ,X-ray photoelectron spectroscopy ,Raman spectrometry ,and ultraviolet-visible light absorption spectrometry .The specific surface area of as-prepared NS/TiO2 photocatalysts was determined by BET method ,and their catalytic activity towards the degradation of Rhodamine B under visible light irradiation was evaluated .Results show that as-prepared NS/TiO2 photo-catalyst with a TU to HT mass ratio of 0 .5∶1 exhibits the highest photocatalytic activity and provides a Rhodamine B degradation rate of 44 .4% after 70 min of irradiation .Besides ,N in the form of NH3 is adsorbed on the surface of TiO2 ,and S exists in the form of S6+ and partially substitutes Ti 4+ in TiO2 lattice .In the meantime ,N and S codoping contributes to reduce the prohibited bandgap of TiO 2 thereby increasing its photocatalytic activity .% 采用研磨煅烧法，以硫脲（TU）作为氮源和硫源，H2 TiO3（HT ）为TiO2的前驱体，制备了不同TU/HT比例的N ，S共掺杂TiO2光催化剂（NS/TiO2）；利用X射线衍射仪、透射电镜、X射线光电子能谱仪、拉曼光谱仪、紫外-可见吸收光谱仪等分析了NS/TiO2的晶体结构、显微形貌、典型元素的化学状态以及光谱性质；利用BET法测定了NS/TiO2的比表面积，同时测定了其在可见光照下催化降解罗丹明B的活性．结果表明，当 TU/HT质量比为0．5时，NS/TiO2的光催化活性最佳，光照70 min时的罗丹明B降解率为44．4％．氮元素以NH3形式吸附在TiO2表面，硫元素以S6＋形式存在，部分S6＋取代Ti4＋的位置．与此同时N ，S共掺杂使得TiO2的禁带宽度减小，可见光催化活性提高．
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