ChCl/C6H8O7 deep eutectic solvent(DES) was synthesized by choline (ChCl) as hydrogen bond acceptor and citric acid (C6H8O7) as hydrogen bond donor. Meanwhile, twenty percent of water was added into ChCl/C6H8O7 to reduce the viscosity. The structure was characterized and analysed by FI⁃IR and 1H⁃NMR. The denitrification of basic nitrogen in simulated oil was studied by using ChCl/C6H8O7 DES as extractant. The results show that the removal rate of quinoline in the simulated oil can attach to 95.64%, when the mass ratio of solvent to oil is 1∶5, the extraction time is 35 min, and the extraction temperature is 20 ℃. At the same time, taking toluene and cyclohexene as examples, the effects of aromatic hydrocarbons and olefins on the denitrification of DES are investigated. The mechanism of denitrification of DES is determined by infrared spectroscopy

In this paper, ascorbic acid as combustion agent, composite oxides of nickel ferrite were prepared by combustion method. The optimal molar ratio of ferric nitrate to nickel nitrate was determined by XRD. The UV absorbance properties of composite were analyzed by UV spectra. The morphology of composites was characterized by scanning electron microscopy. The photocatalytic properties were studied using methylene blue as the degradation substrate and composite as catalyst. The experiment showed important effect of amount of catalyst, the pH value of the solution, the amount of hydrogen peroxide and irradiation time of the photocatalyst. The optimal photocatalytic condition is: dose of catalyst 20 mg, pH at 6, and hydrogen peroxide 6 mL. The results indicate that the nickel ferrite with molar ratio of nickel nitrate, ferric nitrateand ascorbic acid of 1:2:1 is photocatalytic effective under UV and visible light. Moreover, the nickel ferrite with molar ratio of nickel nitrate, ferric nitrateand ascorbic acid of 2:1:1 and 1:3:1 are photocatalytic effective under UV light.

Series of CdS/Ag2S composite photocatalysts with different Ag2S concentrations were prepared by the precipitation-grinding method. The prepared samples were characterized by X-ray diffraction, scanning electron microscopy, UVvisible spectroscopy, and photoluminescence spectroscopy. The catalyst particle size of CdS/Ag2S was proved to be smaller than the catalyst particle size of CdS. The reaction system was set under visible light irradiation to study the influence to the photocatalytic performance of CdS/Ag2S with different condentration of Ag2S. The CdS/Ag2S composite photocatalyst with the weight of 100% concentration of Ag2S showed the highest photocatalytic activity and the degradation of Rhodamine B was 71%.The presence of Ag2S also restrained the recombination rate of e-/h+ pairs.The photocatalytic activity of degradation of Rhodamine B was significantly improving.

Base on the twostep method, ionic liquid \[BPy\]\[CF3SO3\] was synthesized from 1,4Butane sultone, ridine trifluoromethane sulfonic acid and py. Oxidationextraction desulfurization of model oil has been carried out with the ionic liquid as catalyst and 30% H2O2 as the oxidant. Desulfurization rate of model oil could reach to 94%, when treating 10 mL model oil with 0.6 g ionic liquid, 0.2 mL H2O2 at 50 ℃ for 30 min. After drying with rotary evaporator, the ionic liquid was regenerated for nextrun use, and the desulfurization rate could be still as high as 70% after recycling 5times.

In this work, controlling the pH of the solution was 8, which ensure that the carbonate exists in the form of bicarbonate. The bicarbonate were decomposed carbonate by heating. The carbonate and zinc ions producted zinc carbonate precipitation, zinc carbonate were decomposed ZnO by calcination. Nanometer ZnO were preparated by homogeneous precipitation. Samples were characterized by Xray diffraction(XRD),scanning electron microscopy(SEM),UV spectroscopy. The rhodamine B(RhB) was aim of degradation.The photocatalytic activity of the samples was evaluated by the photocatalyst of rhodamine B(RhB) under UV light irradiation.It was studied on effects of catalyst dosage, pH and H2O2 dosage on photocatalytic time. The experimental results show 100 mL RhB was completely photocatalized in 130 min under adding the mass of calalyst was 24 mg ,pH was 4 and the volue of H2O2 was 2 mL.