Fe-F/TiO_2复合微球的制备与光降解部分水解聚丙烯酰胺机制

以Span-80为调控剂,钛酸四丁酯(TBOT)为钛源,采用低温水解-回流法制备了Fe-F共掺杂TiO_2介孔复合微球(Fe-F/TiO_2)。通过XRD、SEM、FTIR、TG-DTA、BJH和UV-vis DRS测试方法对样品进行了结构性能表征;以部分水解聚丙烯酰胺(HPAM)为目标降解物,研究了Fe-F/TiO_2复合催化剂的光催化性能。结果表明,制得的Fe-F/TiO_2是由直径为10~15nm的纳米粒子堆砌而成的锐钛矿型介孔微球,其中Fe3+可以有效促进锐钛矿而抑制金红石相的生成,使其具有较高的热稳定性;比表面积、孔容积及平均孔径分别是145.11 m2/g、0.26cm3/g和6.23nm。在光降解HPAM的过程中,Fe3+和F-的协同效应可以提升材料的光催化性能,使FeF/TiO_2具有最高的催化活性。在紫外光及可见光条件下,0.1g的Fe-F/TiO_2降解100mL浓度为500mg/L的HPAM溶液120min,其COD去除率分别为81%和74%。

Preparation of Fe-F/TiO2 microsphere and its photodegradation mechanism for partially hydrolyzed polyacrylamide

With Span-80 as controlling agent,tetrabutyl orthotitanate (TBOT) as titanium source,Fe and F co-doped TiO2 composite (Fe-F/TiO2) microsphere was fabricated by hydrolysis-reflux method at low temperature.The structure and properties of as-prepared Fe-F/TiO2 samples were characterized using XRD,FTIR,SEM,TG-DTA,BJH and UV-Vis DRS.The photocatalytic performance was evaluated by degrading partially hydrolyzed polyacrylamide (HPAM).The results show that mesoporous anatase Fe-F/TiO2 microsphere is assembled with nanoparticles of which the diameter is 10-15 nm;Fe3+ can effectively promote the formation of anatase and inhibit the generation of rutile phase,which can result in high thermal stability;the specific surface area,pore volume,average pore diameter of catalyst are 145.11 m2/g,0.26 cm3/g and 6.23 nm,respectively.In the process of photodegradation of HPAM,the synergistic effect of Fe3+ and F-can enhance the photocatalytic performance which makes Fe-F/TiO2 have the highest photocatalytic activity.The COD removal rate of HPAM (initial concentration of 500 mg/L) can be up to 81% and 74% when illuminated under ultraviolet (UV) and visible light for 120 min using 0.1 g of catalyst.