二氧化钛纳米棒在可见光下的光催化活性及其在降解有机污染物中的应用

The FTO/TiO2 seed layer/TiO2 nanorods were prepared by ion beam deposition and hydrothermal methods. Under UV light, the photocurrent density of FTO/TiO2 seed layer/TiO2 nanorods can reach 1.39 mA/cm2, which is higher than that without seed layer and nanorods structure. Not only that, the FTO/TiO2 seed layer/TiO2 nanorods can also adsorb visible light, which overcomes the defect that traditional TiO2 can not absorb visible light. The photocurrent density of FTO/TiO2 seed layer/TiO2 nanorods can reach 0.21 mA/cm2 under visible light. The increased performance resulted from the deposition of the TiO2 seed layer, which can reduce the band gap of TiO2. FTO/TiO2 seed layer/TiO2 nanorods also exhibited high photodegradation ability for organic pollutant methylene blue (MB). Within 120 min, 77.3% MB can be degraded, and the degradation rates remained almost unchanged after four cycles. Not only that, compared with powdered photocatalysts, FTO/TiO2 seed layer/TiO2 nanorods is easy to recover, and it can be reused by rinsing it with water several times and drying it naturally after the reaction.     

Si纳米线/ZnFe2O4/AgBr光催化剂的构建及其磁场可调控性能

采用金属辅助化学刻蚀法和水热法制备了Si纳米线/ZnFe₂O₄/AgBr复合光催化剂,考察了Si纳米线/ZnFe₂O₄/AgBr在磁场作用下的光催化性能。结果表明：Si纳米线/ZnFe₂O₄/AgBr复合光催化剂在未使用HNO₃溶液浸泡且无磁场作用时的光电流密度为0.25 mA/cm²,开启电压为0.4 V;Si纳米线/ZnFe₂O₄/AgBr复合材料在合成时表面会产生Ag,采用HNO₃溶液将其浸泡除去Ag,浸泡后光电流密度为0.07 mA/cm²,相比于未使用HNO₃溶液浸泡时的光电流密度明显下降,这是由于Ag具有传输电子与空穴的能力,可加快ZnFe₂O₄和Si纳米线间光生电子和光生空穴对的分离,从而提高光电流密度;当外加80000 A/m磁场时,其光电流密度...