沸石特性对负载纳米TiO2光催化去除水中土霉素的影响

通过固体扩散法将纳米TiO2负载在不同亲疏水性及孔径的沸石上制成复合光催化剂,研究不同配比的复合光催化剂在32 W紫外灯照射下对水中土霉素的去除和矿化效果,结果表明：UV/10％TZ2（亲水沸石）较UV/40％TZ1（疏水沸石）,UV/15％T5A（孔径为0.5 nm的亲水沸石）较UV/10％T13X（孔径为1 nm的亲水沸石）对水中的土霉素具备更佳的去除效果,即亲水型及小孔径的沸石分子筛更适合负载纳米TiO2光催化氧化去除水中的土霉素.由于羟基自由基的作用距离限制,被吸附在13X内孔的土霉素无法被降解去除.

Influence of Characteristic of Zeolite on Loading Nano-TiO2 for Photocatalytic Degradation of Oxytetracyline in Aqueous Solution

The composite photocatalysts were made by using solid dispersion method with nano-TiO2 loaded on hydrophobic or hydrophilic zeolite and zeolite with different pore diameters. The removal and mineralization efficiency of oxytetracycline （OTC） in aqueous solution were investigated under the irradiation of 32 W UV lamps by composite photocatalysts loaded with different ratios of nano-TiO2. The results showed that UV/10%TZ2 （hydrophilic zeolite） achieved a better removal efficiency of OTC than UV/40%TZ1 （hydrophobic zeolite） while UV/15%TSA （hydrophilic zeolite with a pore diameter of 0.5 nm） achieved a better removal efficiency of OTC than UV/10%T13X （hydrophilic zeolite with a pore diameter of 1 nm）. That is to certify that the hydrophilic zeolite and zeolite with small pore diameters loaded with nano-TiO2 could achieve better removal effects for OTC in aqueous solution. The OTC that adsorbed on the inside surface of 13X cannot be degraded due to the out range of hydroxyl radicals attack.