论文部分内容阅读
以无定形TiO2沉淀为前驱体,在水热条件下得到了含板钛矿(121)相混晶纳米TiO2,考察了水热反应的温度和时间等因素对含板钛矿型TiO2光催化活性的影响.采用XRD、TEM对制备的TiO2进行初步表征,并结合光催化(λ≤387 nm)降解有机染料的光活性探针反应.结果表明,水热温度为150℃,时间为24 h时,可制得具有较高光催化活性的纳米TiO2,其纳米尺寸为14.20 nm,板钛矿相含量63.6%,锐钛矿含量为36.4%.光催化实验中跟踪研究了其对染料酸性桃红(sulforhodmineB,SRB)的褪色及2,4-DCP的降解情况,并对降解中间产物H2 O2、.OH进行跟踪测定,实验结果表明板钛矿相混晶TiO2的光催化主要涉及.OH氧化历程,光照射9 h对SRB和2,4-DCP的矿化氧化分别达到89%和78%,循环5次光催化降解SRB实验,催化剂表现出较好的稳定性,催化性能无明显变化.
The amorphous TiO2 precipitates were used as precursors, and titanate (121) phase mixed nanostructured TiO2 was obtained under hydrothermal conditions. The effects of hydrothermal reaction temperature and time on the photocatalytic activity of brookite TiO2 The prepared TiO2 was characterized by XRD and TEM, and combined with the photocatalytic (λ≤387 nm) degradation of the photoactive probe reaction of organic dyes.The results showed that when the hydrothermal temperature was 150 ℃ and the time was 24 h , The nanosized TiO2 with high photocatalytic activity can be obtained, the nanosize size is 14.20 nm, the content of brookite is 63.6% and the content of anatase is 36.4%. The photocatalytic activity of the nanosized TiO2 on sulforhodmineB , SRB) and degradation of 2,4-DCP. The degradation products of H2O2 and .OH were also measured. The photocatalysis of TiO 2 photocatalyst mainly involved the oxidation process of OH, light The mineralization oxidation of SRB and 2,4-DCP reached 89% and 78% respectively after 9 h of irradiation, and the photocatalytic degradation of SRB was carried out 5 times. The catalyst showed good stability and no obvious change in the catalytic performance.