针对有机污染物废水排放对生态环境带来的严重危害问题,通过在氩气(Ar)条件下煅烧钛基金属有机框架[MIL-125(Ti)],制备了具有金红石和锐钛矿混合晶型的介孔圆盘状TiO2附着的碳骨架(TiO2/C)。利用红外光谱(FT-IR)、扫描电镜(SEM)、X射线衍射(XRD)、比表面积(BET)及紫外-可见光(UV-Vis DRS)等手段对TiO2/C进行表征,并研究了C骨架的引入对TiO2光催化性能的影响。结果表明:在一定温度和气氛条件下煅烧MIL-125(Ti),衍生得到的TiO2/C具有较大的比表面积(199.8m2/g)和适当的微孔与中孔比,C骨架支撑可有效地增强TiO2表面光生电荷的分离和迁移速率,抑制电子-空穴对(e-/h+)的再结合,从而促进TiO2在可见光照射下的催化活性。与MIL-125(Ti)和TiO2相比,TiO2/C表现出显著提高的光催化降解罗丹明B(RhB)效率,同时具有良好的光催化活性稳定性。
In view of the serious harm to the ecological environment caused by organic pollutant wastewater discharge,disc-shaped mesoporous TiO2-anchored carbon skeleton (TiO2/C) with a mixed crystalline morphology of rutile and anatase was prepared by calcining titanium-based organic framework (MIL-125(Ti)) in argon (Ar) atmosphere.The TiO2/C was characterized by Fourier-transform infrared spectroscopy (FT-IR),scanning electron microscopy (SEM),X-ray diffraction (XRD),specific surface area (BET) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS).The effect of the introduction of the C skeleton on the photocatalytic performance of TiO2 was investigated.The results showed that TiO2/C derived from MIL-125(Ti) calcined under a certain temperature and atmosphere possessed a larger specific surface area (199.8m2/g) and an appropriate ratio of micropore to mesopore.The C skeleton support effectively enhanced the separation and migration rates of photogenerated charges on TiO2 surface,thus promoting the catalytic activity of TiO2 under visible light irradiation by inhibiting the recombination of electron-hole pairs (e-/h+).Comparing with MIL-125(Ti) and TiO2,TiO2/C exhibited extraordinarily facilitated photocatalytic degradation efficiency for RhB,and outstanding photocatalytic stability.
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基金资助
国家自然科学基金(22072089);新疆生产建设兵团重大科技项目(2019AAA001)
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