Egyptian Petroleum Research Institute, 11727, Cairo, Egypt.
Egyptian Petroleum Research Institute, 11727, Cairo, Egypt.
J Environ Manage. 2019 Nov 15;250:109462. doi: 10.1016/j.jenvman.2019.109462. Epub 2019 Aug 29.
Preparation of active photocatalytic nanostructures to harvest the abundant sunlight energy is a recent worldwide direction for clean energy production and environmental management. Following this target, different calcium carbonate-titania nanostructures were prepared by three different pathways using available raw materials such as limestone as calcium precursor. After characterization of the prepared materials with X-ray diffraction (XRD), X-ray fluorescence (XRF) patterns, Fourier transmission infrared (FT-IR), high resolution transmission electron microscope (TEM), N adsorption-desorption isotherm, UV-vis diffuse reflectance and photoluminance (PL), the materials were applied as novel photocatalysts for desulfurization of dibenzothiophene (DBT) and gas oil using different radiation sources at room temperature. It has been obtained that, 95% desulfurization of DBT was possible under 1 h visible light irradiation with linear halogen lamp (LHL) at catalyst/DBT-solution = 10 g/L, while ultra-clean diesel production (99% removal, 3.47 ppm) could be obtained via normal sunlight photochemical desulfurization of diesel fuel by calcium carbonate titania photocatalyst in presence of HO and acetic acid as oxidizing agents and acetonitrile as a solvent. Here, the followed preparation pathway produced highly active calcium titanate photocatalysts with tunable band gap energy (2.05 eV), reduced electrons/hole pairs recombination and stable photocatalytic activity with enhanced visible light removal of organosulfur compounds for economic ultra-clean fuel production, pollution control, and environmental management.
制备能够利用丰富太阳光能的活性光催化纳米结构是目前全球范围内清洁能源生产和环境管理的一个新方向。为了实现这一目标，我们采用三种不同途径，利用石灰石等易得的原材料作为钙前体，制备了不同的碳酸钙-二氧化钛纳米结构。通过 X 射线衍射（XRD）、X 射线荧光（XRF）图谱、傅里叶变换红外（FT-IR）、高分辨率透射电子显微镜（TEM）、N2 吸附-脱附等温线、紫外-可见漫反射和光致发光（PL）对所制备材料进行了表征，然后将这些材料作为新型光催化剂，在室温下使用不同的辐射源对二苯并噻吩（DBT）和瓦斯油进行脱硫研究。结果表明，在 1 h 的可见光照射下，使用线性卤灯（LHL），催化剂/DBT 溶液比为 10 g/L，可实现 95%的 DBT 脱硫；而在碳酸钙-二氧化钛光催化剂存在下，HO 和乙酸作为氧化剂，乙腈作为溶剂，通过太阳光光化学脱硫，可以获得超清洁的柴油（去除率 99%，硫含量 3.47 ppm）。在这种情况下，所采用的制备途径能够制备出具有可调带隙能（2.05 eV）、减少电子/空穴对复合、可见光去除有机硫化合物的光催化活性高且稳定的活性钙钛矿光催化剂，从而实现经济的超清洁燃料生产、污染控制和环境管理。
