Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, 11727, Egypt.
Chemistry department, Faculty of Science, Al-Azhar University, Assuit, Egypt.
Environ Sci Pollut Res Int. 2021 Oct;28(38):52993-53009. doi: 10.1007/s11356-021-14501-5. Epub 2021 May 22.
Irradiated waste high-density polyethylene@Zn/ionic liquid novel composite well-fabricated via coacervation method was irradiated by gamma-irradiation and studied the effect of that radiation on the desulfurization process. The prepared composites were characterized by various analytical techniques as follows: X-ray diffraction (XRD), Fourier-Transform infrared (FT-IR), X-ray photoelectron spectrometer (XPS), scanning electron microscope (SEM), High Resolution Transmission Electron Microscopy (HRTEM), N-adsorption-desorption isotherm, and thermal gravimetric analysis (TG/DTA). The adsorptive desulfurization process of benzothiophene (BT) and dibenzothiophene (DBT) which are harmful compounds in diesel model fuel was investigating using the irradiated and unirradiated composite. The results illustrated that the unirradiated and irradiated composites exhibit an adequate adsorption capacity reached (50-75 mg S/g) and (60-85 mg S/g) for BT and DBT, respectively. The adsorption process over the prepared adsorbents follows the pseudo-second-order kinetic models. The irradiated composite exhibited more adsorption capacity than the unirradiated one due to the radiation generated more surface area and created proton-bond donor sites in the composite surface, which increases the interaction between the surface and sulfur species. The adsorption capacity and adsorption percentage for irradiated and unirradiated composites towards (SCCs) were studied using response surface methodology based on the central composite design (CCD). The thermodynamic factors (∆H°, ∆G°, and ∆S°) reveal that these processes are endothermic adsorption processes. The irradiated PEt @Zn/IL was re-used without significant loss of adsorption activity. This novel irradiated PEt @Zn/IL is the first time used as an adsorbent with an advantage that includes its excellent adsorption capacity, which ensures the product will be efficient in a real process such as the petrochemical industry.
辐照废高密度聚乙烯@Zn/离子液体新型复合凝聚法制备，经γ射线辐照，研究辐射对脱硫过程的影响。采用各种分析技术对制备的复合材料进行了表征，如：X 射线衍射（XRD）、傅里叶变换红外（FT-IR）、X 射线光电子能谱（XPS）、扫描电子显微镜（SEM）、高分辨率透射电子显微镜（HRTEM）、N-吸附-解吸等温线和热重分析（TG/DTA）。采用辐照和未辐照复合材料研究了二苯并噻吩（DBT）和苯并噻吩（BT）在柴油模型燃料中有害化合物的吸附脱硫过程。结果表明，未辐照和辐照复合材料对 BT 和 DBT 的吸附容量分别达到（50-75）mg S/g 和（60-85）mg S/g。制备的吸附剂的吸附过程符合准二级动力学模型。辐照复合材料的吸附容量大于未辐照复合材料，这是因为辐照产生了更多的表面积，并在复合材料表面形成质子供体位，增加了表面与硫物种之间的相互作用。采用基于中心复合设计（CCD）的响应面法研究了辐照和未辐照复合材料对（SCCs）的吸附容量和吸附率。热力学因素（∆H°、∆G°和∆S°）表明，这些过程是吸热吸附过程。辐照后的 PEt @Zn/IL 无需进行重大的失活处理即可重复使用。这种新型的辐照后的 PEt @Zn/IL 首次被用作吸附剂，其优点是具有优异的吸附容量，这确保了该产品在石化等实际过程中具有高效性。
