高效负载型光催化剂制备及其加铂修饰技术

Tetrabutyl Titanate Hydrolysis Prepared TiO_2 Photocatalysis Loaded with Platinum Technology

通过光催化氧化五氯苯酚钠实验 ,结合对催化剂晶型结构、比表面积的表征分析 ,优化钛酸四丁酯水解制备TiO2 负载型催化剂并加铂修饰的制备条件 :R值、烧结温度、粘合剂添加量、空心玻璃珠粒径大小及催化剂中铂含量 ,从而制备出高效、实用的负载加铂修饰型半导体光催化剂 .实验结果表明 ,当R =1 0 ,温度为 65 0℃烧结 1h ,TiO2 ∶硅酸钠∶空心玻璃珠 =1 0∶2 5∶2 0 (W) ,铂在催化剂中的重量百分比为 1 .4 %～ 1 .6% ,空心玻璃珠的粒径为0 .5mm时 ,所制备的加铂修饰负载型催化剂催化活性、使用寿命和牢固度均比较理想 .用该催化剂做光催化实验 ,当反应液初始五氯苯酚钠浓度为 1 0 0mg/L、pH值为 6.5 ,催化剂投加量为 2 g/L ,通氧气量为 1 6mL/s ,光照强度为 30kW /m2 时 ,五氯苯酚钠 2h光催化氧化率达 92 0 %

Photocatalysts Pt /TiO 2 coated on hollow glass beads were prepared by tetrabutyl titanate hydrolysis with Sodium silicate on hollow glass beads at various condition and loaded with platinum varying from 0 2% to 2 4% by weight. Sodium pentachlorophenolate (PCP Na ) solution were used to examined for their photoactivity and characterized by X ray and BET. The results indicated that the optimization condition to prepare photocatalysts: Water to titanium alkoxides was 100, Sintering temperature was 650℃, Diameter of hollow glass beads was 0 5mm , TiO 2 ∶ sodium silicate ∶ hollow glass beads was 10∶2 5∶20, Platinum content of photocatalysts was about 1 4%～1 6%. When the experiments were carried out in such conditions, the initial concentration of PCP Na was 100 mg/L, initial pH was 6 5, oxygen flux was 1 6mL/s, illumination intensity was 30 kW·m 2 , catalysts was 2 g/L, illumination time was 2 hours , respectively. Then the rates removals of PCP Na could reach 92 0%.