The ethanol concentration, solid-to-solvent ratio, extraction temperature and extraction time were optimized by using orthogonal array design, an ultrasonic-assisted extraction (UAE) method was formed for extracting total flavonoids from Cassia Seeds. The optimal conditions for total flavonoids preparation were found to be extracted at 55 °C for 40 min with 75% (v/v) ethanol and a solid-to-liquid ratio of 1:30 (g/mL). The UAE was proven more efficient than the conventional extraction (CE) technique, which could be considered a time-saving method. Therefore, the UAE could be a promising candidate for extracting phenolic phytochemicals from natural plants.

Mg-doped ZnO was synthesized using a co-precipitation technique. X-ray diffraction (XRD) measurements and absorption spectra show that Mg ions are doped into the lattice positions of ZnO. In the room temperature photoluminescence (PL) spectra, two emission bands, ultraviolet (UV) and visible, were observed. Either of two emissions shows a blue-shift. The visible emission band is composed of the green emission and the blue emission. The amount of blue-shift in green emission is 0.03 eV, about half of the amount of blue-shift in blue emission. Mg substitution raises and lowers conduction- and valence-band edges, respectively.

The stain of Fusarium sp. HJ01 used in 4-chlorophenol (4-CP) degradation was isolated in our laboratory. The effects of pH, temperature, 4-CP concentration, carbon source on 4-CP degradation rate were studied. It was concluded that Fusarium sp. HJ01 could grow with 4-CP as the sole carbon and energy source. 4-CP concentration of 100mg/L in the pH range of 4~10 and temperature range of 25°C~35°C could be degraded completely. The capacity of 4-CP degradation was effectively enhanced by the addiction of sucrose. The kinetics of 4-CP degradation could well accord with the Haldane model for 4-CP as the sole carbon source and with first order equation for added other sucrose.

The effects of the supply voltage, water flow rate, concentration of H2O2absorption and flue gas flow rate on NO removal rate were studied. The chemical reaction mechanism of NO removal was discussed. It was concluded that the NO removal rate increased the increasing of supply voltage, water flow rate and concentration of H2O2, and decreased with the increasing of the flue gas flow rate on the experimental conditions. On the synergy with corona discharge and H2O2solution oxidation, NO removal rate reached 60.2%.

The effects of the supply voltage, water flow rate, concentration of inlet SO2and Fe2+in liquid phase on the desulfurization efficiency were investigated by corona discharge with liquid phase on the condition of DC discharge and pulse discharge. The experimental results showed that the desulfurization efficiency increased with the increasing of the supply voltage, water flow rate, and concentration of Fe2+. However, the desulfurization efficiency was nearly unchanged with the increasing of the initial concentration of SO2. The desulfurization efficiency in pulse discharge was better than that of the DC discharge on the same condition, and the highest desulfurization efficiency could be more than 99%.