摘要：

以原位合成法制备的Al₂O₃/Fe₃O₄磁性粒子为载体, 采用低温水解法制备了TiO₂/Al₂O₃/Fe₃O₄磁载光催化剂。用XRD、SEM、TEM等对制备的磁载光催化剂的结构进行了表征。以25 mg/L苯酚为模拟污染物, 对制备的磁载光催化剂的催化性能进行了考察。结果表明:对于n(TiO₂):n(Al₂O₃):n(Fe₃O₄)= 60:5:1条件下制备的磁载光催化剂, 当光催化反应时间为120 min, 催化剂质量浓度(以TiO₂计)为1 g/L时, 降解苯酚的反应速率常数为0.022 3, 循环使用5次后, 反应速率常数仅下降0.004 1, 平均回收率可达85.06%。

关键词: 二氧化钛, 三氧化二铝, 低温, 磁载光催化剂, 催化活性, 磁回收性能

Abstract:

Magnetic photocatalyst TiO₂/Al₂O₃/Fe₃O₄ has been successfully prepared by low temperature hydrolysis method, using magnetic particles Al₂O₃/Fe₃O₄ prepared by in-situ method and used as carriers. The structure of magnetic photocatalyst are characterized by XRD, SEM and TEM, etc. Taking 25 mg/L of phenol as simulated pollutant, the catalytic capacity of the prepared magnetic photocatalyst has been investigated. The results show that the magnetic photocatalyst prepared under the condition of n(TiO₂):n(Al₂O₃):n(Fe₃O₄)=60:5:1, the reaction rate constant of phenol degradation is 0.022 3, when photocatalystic reaction time is 120 min, and catalyst mass concentration(as TiO₂) 1 g/L. After it has been used circularly for five times, the reaction rate constant reduces only 0.004 1, and its average recovery rate can reach 85.06%.

Key words: titanium dioxide, aluminum oxide, low temperature, magnetic photocatalyst, photocatalytic activity, magnetic recovery capacity

中图分类号: 

• O643.36

• X703