利用三聚氰胺和碳酸钙成功合成了一种新型吸附剂CaCO 3/g-C 3 N 4。通过XRD,FT-IR,SEM,TEM和BET对CaCO 3/g-C 3 N 4的结构进行深入研究。实验结果表明:CaCO 3/g-C 3 N 4对结晶紫(CV)具有快速、高效的吸附性能(89.34%)和出色的吸附容量(1...利用三聚氰胺和碳酸钙成功合成了一种新型吸附剂CaCO 3/g-C 3 N 4。通过XRD,FT-IR,SEM,TEM和BET对CaCO 3/g-C 3 N 4的结构进行深入研究。实验结果表明:CaCO 3/g-C 3 N 4对结晶紫(CV)具有快速、高效的吸附性能(89.34%)和出色的吸附容量(1209.75 mg/g)。CaCO 3/g-C 3 N 4对CV的吸附符合准二级动力学和Langmuir等温吸附模型。同时,基于吸附前后吸附剂的FT-IR和XPS分析,得出π-π堆积,n-π相互作用和氢键协同效应是CaCO 3/g-C 3N 4选择性吸附CV的重要因素。展开更多
The polycrystalline phase WO_3/g-C_3N_4 was synthesized under stirring using tungstenic acid(H_2WO_4) and graphitic carbon nitride(g-C_3N_4) as raw materials. The catalyst was characterized by X-ray diffraction(XRD), ...The polycrystalline phase WO_3/g-C_3N_4 was synthesized under stirring using tungstenic acid(H_2WO_4) and graphitic carbon nitride(g-C_3N_4) as raw materials. The catalyst was characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),the Fourier transform infrared spectroscopy(FT-IR),and the Brunauer-Emmett-Teller analysis(BET). The polycrystalline phase WO_3/g-C_3N_4 was determined by XRD technique. The oxidative desulfurization process was investigated using WO_3/g-C_3N_4 as the catalyst, 30% hydrogen peroxide(H202) as the oxidant, and 1-butyl-3-methylimidazolium tetrafluoroborate([bmim]BF4) ionic liquids(ILs) as the extractant. The operating conditions, including H_2WO_4 amount, IL dose, H_2 O_2 volume, temperature, catalyst dosage, and types of sulfur compounds,were systematically researched. The desulfurization rate could reach 98.46% for removing dibenzothiophene(DBT) from the model oil under optimal reaction conditions. In addition, the catalytic activity was slightly decreased after five recycles of catalysts. The reaction kinetics analysis shows that the oxidative desulfurization system was in accord with the first-order reaction kinetics equation. The mechanism of oxidative desulfurization was proposed.展开更多
基金the financial support of the Doctoral Fund of Liaoning Province (201501105)
文摘The polycrystalline phase WO_3/g-C_3N_4 was synthesized under stirring using tungstenic acid(H_2WO_4) and graphitic carbon nitride(g-C_3N_4) as raw materials. The catalyst was characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),the Fourier transform infrared spectroscopy(FT-IR),and the Brunauer-Emmett-Teller analysis(BET). The polycrystalline phase WO_3/g-C_3N_4 was determined by XRD technique. The oxidative desulfurization process was investigated using WO_3/g-C_3N_4 as the catalyst, 30% hydrogen peroxide(H202) as the oxidant, and 1-butyl-3-methylimidazolium tetrafluoroborate([bmim]BF4) ionic liquids(ILs) as the extractant. The operating conditions, including H_2WO_4 amount, IL dose, H_2 O_2 volume, temperature, catalyst dosage, and types of sulfur compounds,were systematically researched. The desulfurization rate could reach 98.46% for removing dibenzothiophene(DBT) from the model oil under optimal reaction conditions. In addition, the catalytic activity was slightly decreased after five recycles of catalysts. The reaction kinetics analysis shows that the oxidative desulfurization system was in accord with the first-order reaction kinetics equation. The mechanism of oxidative desulfurization was proposed.
