以钛酸四丁酯为钛源、尿素为氮源、磷酸为磷源,采用溶胶凝胶-水热法制备了氮磷共掺杂TiO2光催化剂,用于高湿度氯苯(Chlorobenzene,CB)废气的净化.通过响应面法确定了最佳制备比例,N、P、(NH4)2CO3与Ti的物质的量比为0.5:0.5:0.5:1.利用XRD、TEM和XPS等方法对催化剂进行表征,氮磷共掺杂TiO2为锐钛矿和金红石混合晶型,具有较大的比表面积,吸收波长红移至497 nm.在相对湿度10%、CB初始进气浓度150 mg·m?3、停留时间60 s时,CB去除率达到94.6%;该催化剂的光催化活性随着相对湿度的增加下降非常缓慢,在相对湿度90%时仍可获得较高的CB转化率(>70%);催化剂连续使用24 h后,对CB的催化转化率从94%降至74%,表明催化性能稳定性较好.%Nitrogen and phosphorus co-doped TiO2 photocatalysts were synthesized by a hydrothermal sol-gel method using tetrabutyl titanate as titanium source, urea as nitrogen source and phosphoric acid as phosphorus source. Response surface methodology (RSM) was employed to obtain the optimum ratio of 0.5:0.5:0.5:1 (N:P:(NH4)2CO3:Ti) for achieving the best chlorobenzene (CB) removal rate. The catalysts were characterized by XRD, TEM, XPS, etc., and the results suggest that the nitrogen and phosphorus co-doped TiO2 consists of anatase and rutile with larger surface area. The UV-vis absorption spectra are red-shifted to 497 nm. CB removal efficiency is 94.6% under conditions of relative humidity 10%, initial concentration 150 mg·m?3 and residence time 60 s. The catalyst remains high removal efficiency (over 70%) under relative humidity 90%, and the removal efficiency decreases slowly under high relative humidity. The catalytic activity slightly reduces from 94% to 74% after continuous running for over 24 h, which reveals that the prepared catalyst has good stability.
展开▼
