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首页> 外文期刊>RSC Advances >Photocatalytic degradation of imidazolium ionic liquids using dye sensitized TiO2/SiO2 composites
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Photocatalytic degradation of imidazolium ionic liquids using dye sensitized TiO2/SiO2 composites

机译：染料敏化的TiO 2 / SiO 2 复合材料对咪唑鎓离子液体的光催化降解

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Ionic liquids (ILs) are widely applied in diverse fields, however, ILs bring considerable challenges to the ecosystem when exposed to the environment due to their cytotoxicity and high chemical stability. It is thus increasingly important to investigate measures for the degradation of IL wastes in industrial processes. This paper presents the preparation of dye-sensitized photocatalysts (DCQ-TiO2/SiO2) and their applications in the degradation of 4 imidazolium ILs (1-butyl-3-methylimidazolium bromide, [BMIM]Br; 1-butyl-3-methylimidazolium tetrafluoroborate, [BMIM]BF4; 1-butyl-3-methylimidazolium hexafluorophosphate, [BMIM]PF6; 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [BMIM]NTf2). The photocatalysts are prepared through in situ incorporation of TiO2 into silica matrices and sensitization with 2,9-dichloroquinacridone (DCQ). The photocatalysts are then characterized with N2 adsorption–desorption isotherm measurements, transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), elemental analysis and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results show that these photocatalysts exhibit high catalytic activities when they are applied in the degradation of imidazolium ILs. The degradation efficiency for [BMIM]Br can reach up to 95% under simulated sunlight irradiation in 180 minutes. The photodegradation intermediates of [BMIM]+ are identified as harmless and easily biodegradable moieties.
机译：离子液体（ILs）广泛应用于各个领域，但是，由于离子液体具有细胞毒性和高化学稳定性，因此暴露于环境中会给生态系统带来巨大挑战。因此，研究在工业过程中降解IL废物的措施变得越来越重要。介绍了染料敏化光催化剂（DCQ-TiO 2 / small> / SiO 2 ）的制备及其应用降解4个咪唑类ILs（1-丁基-3-甲基咪唑鎓溴化物，[BMIM] Br; 1-丁基-3-甲基咪唑鎓四氟硼酸盐，[BMIM] BF 4 ; 1-丁基-3-甲基咪唑鎓六氟磷酸盐，[BMIM] PF 6 ; 1-丁基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺，[BMIM] NTf 2 ）。通过将TiO 2 原位掺入二氧化硅基质并用2,9-二氯喹ac啶酮（DCQ）敏化来制备光催化剂。然后通过N 2 吸附-解吸等温线测量，透射电子显微镜（TEM），X射线衍射（XRD），拉曼光谱，傅里叶变换红外光谱对光催化剂进行表征（FT-IR），元素分析和紫外可见漫反射光谱（UV-vis DRS）。结果表明，当将这些光催化剂用于咪唑类ILs的降解中时，它们显示出高催化活性。在180分钟的模拟阳光照射下，[BMIM] Br的降解效率可达到95％。 [BMIM] + 的光降解中间体被鉴定为无害且易于生物降解的部分。

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