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采用水热晶化法制备了不同掺硼(B)量的B/TiO2,利用可见光催化降解有机污染物试验考察制备条件对其光活性的影响,得到最佳制备条件:TiCl4为钛源、氨水为碱化剂、前驱物粉体用量为65 g/L、介质pH为10、保温温度为120℃和保温时间为6 h.采用X射线衍射法(XRD)、扫描透镜(TEM)和紫外-可见反射吸收光谱对制备的催化剂进行表征.通过X-射线光电子能谱(XRS)测定活性最高的掺B/TiO2其掺B量(nB/nTi)为0.04,此时B/TiO2催化剂为金红石与锐钛矿混晶结构,其禁带宽度为2.7 eV.以酸性桃红(SRB)和2,4-二氯苯酚(2,4-DCP)的可见光降解为目标,测定SRB降解过程中总有机碳,发现SRB矿化率为42.4%.
Different amount of B (B) doped with boron (B) was prepared by hydrothermal crystallization method. The photocatalytic degradation of organic pollutants by visible light was used to investigate the influence of preparation conditions on its photoactivity. The optimum preparation conditions were obtained as follows: TiCl4 as titanium source, As the alkalizing agent, the amount of precursor powder was 65 g / L, the pH of the medium was 10, the temperature was 120 ℃ and the holding time was 6 h. XRD, scanning electron microscopy (TEM) and UV- The prepared catalyst was characterized by visible absorption spectrum.It was found that the best B / TiO2 content (nB / nTi) was 0.04 by X-ray photoelectron spectroscopy (XRS), and the B / TiO2 catalyst was rutile and Anatase mixed crystal structure with a forbidden band width of 2.7 eV.The degradation of SRB and 2,4-dichlorophenol (2,4-DCP) by visible light were measured to determine the total organic carbon The SRB mineralization was found to be 42.4%.