The Apocynum venetum L. of Apocynaceae plant is a traditional Chinese herbal medicine. In this paper, we analyzed qualitatively the active compounds in the aqueous extract from the leaves of Apocynum venetum L. by HPLCMS and HPLCDAD. The aqueous extracts method of the mainly active compounds from dried leaves of Apocynum venetum L. was based on HPLC/DAD coupled to an electrospray ionization (ESI) interface. Overall, 8 constituents were separated and identified, which belong to flavonoids.

The dyeing wastewater is processed by photoelectric catalytic oxidation with nickel foam electrode of titanium dioxide， which is prepared with ion liquid. The main influence factors including electrode distance, electrolysis voltage, pH and electrolytic time were studied in processing waste. Results show the optimal operating condition is the electrode gap of 1.0 cm, pH value of 4.4, electrolysis voltage of 5.0V and 100 mg∙L-1 dosages of Na2SO4 in 120 minutes electrolysis time under the irradiation of ultraviolet light . The effect of processing the wastewater with catalytic electrolysis can be greatly improved in water cycle system with continuous air, flocculent and activated carbon. Consequently the removal rate of the Chemical Oxygen Demand (COD)is 78.69%, and the decolored rate is 97.02%. The COD of the processed wastewater is within 100.0 mg∙L-1, and meets the first national emission standards. It is expected that the method will have good prospect in protecting the water resources and environment.

With the medium of triethanolamine acetate ionic liquids and the help of cavitation effect of ultrasonic resonance, the TiO2 collosol is prepared by the sol-gel method and being loaded on nickel foam. The TiO2 electrodes are formed by calcinating at the high temperature. The results show that the optimal electrodes can be obtained with the medium of triethanolamine acetate ionic liquids, under the condition of high power ultrasound resonance for 15 minutes, the ionic liquid volume of 3 mL and the calcination temperature of 400 °C. After the wastewater is processed by photoelectric catalysis under the conditions of electrolysis voltage of 12V, electrode spacing of 1 cm, wastewater pH of 4 and illumination time of 90 minutes, the COD removal rate can reach 63.5%, while the decolorization rate can reach 93.6%.