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以工业硫酸氧钛为原料水解制得SO42-/TiO2光催化剂,并以苯酚为目标降解物,考察了SO24-/TiO2的光催化性能。结果表明:随着SO42-/TiO2制备过程中焙烧温度的升高,其光催化活性逐渐增加,650℃焙烧获得的SO24-/TiO2的光催化活性最好,此后再升高温度会因催化剂中硫的挥发而下降;在确定苯酚原液初始浓度为50 mg/L条件下,SO42-/TiO2的光催化降解苯酚的最佳工艺条件为反应时间2 h、苯酚pH为7、催化剂用量1 g/L。XRD、SEM和FTIR的分析结果显示实验温度下制得的SO42-/TiO2均为锐钛型TiO2;其间掺杂的SO24-在TiO2表面分散性较好,没有聚集成大的颗粒;红外分析的结果初步判定低温(<550℃)焙烧制得的催化剂SO42-在TiO2表面是螯合双配位吸附,高温焙烧时(>550℃)SO42-在TiO2表面是桥式配位吸附。
The SO42- / TiO2 photocatalyst was hydrolyzed by using industrial titanyl sulfate as raw material and the photocatalytic activity of SO24- / TiO2 was investigated. The results show that with the increase of calcination temperature, the photocatalytic activity of SO42- / TiO2 increases gradually and the photocatalytic activity of SO24- / TiO2 calcined at 650 ℃ is the best. After that, Under the condition of initial concentration of phenol solution of 50 mg / L, the optimum conditions for the photocatalytic degradation of phenol by SO42- / TiO2 were reaction time 2 h, phenol pH 7, catalyst dosage 1 g / L. The results of XRD, SEM and FTIR show that the SO42- / TiO2 obtained at the experimental temperature are all anatase TiO2. The doped SO24- is better than TiO2 on the TiO2 surface and does not agglomerate into large particles. Results The results showed that the SO42- catalyst prepared by calcination at low temperature (<550 ℃) was chelate bi-coordinated adsorption on the surface of TiO2. At high temperature calcination (> 550 ℃), SO42- adsorbed on the TiO2 surface.