Advanced Materials Research Vols. 1010-1012

Abstract: A model of aerosol particles being removed from high temperature and humidity gas when passing across cooling walls is constructed, which takes thermophoretic deposition and diffusiophoretic deposition into consideration. The axial distribution of the temperature, humidity and aerosol concentration of the gas can be obtained from this model. The simulated prediction matches well with the experimental data from the literature^[1]. The key factors which affect the aerosol particles deposition efficiency under different humidity conditions have also been revealed.

Abstract: The influence of H₂O₂、addition of Fe²⁺、pH、reaction time and temperature to advanced treatment effect of printing and dyeing wastewater with Fenton oxidation was studied. The results showed that when the addition of H₂O₂ (the concentration was 30%) was 3mL/L,the addition of FeSO₄·7H₂O was 1.6g/L,pH was 4,the temperature was about 30°C,reacting time was 35min,the COD removal efficiency achieved above 55%,COD of effluent was below 45mg/L.

Abstract: The research which is the species selection of constructed wetland plants and the resistance of the plants is the key to ecological wastewater treatment technology. This paper studies the change of chlorophyll content in 4 wetland plants (Phragmites communis, Typha orientalis, Arundo donax and Canna generalis) in different wastewater duress time. The results show: chlorophyll contents in Canna generalis and Arundo donax have less change, and their anti-stress capability are stronger.

Abstract: It analyses the major pollution sources from airport oil depot and the harm they will cause, then it discusses the countermeasures to prevent and control these pollutions from four aspects, i.e. the oil depot construction, the daily management, pollution prevention and controlling methods and perfecting related laws and regulations.

Abstract: Adsorption of uranium(VI) ions by Sodium alginate (SA) immobilized nano-α-Fe₂O₃ particles beads were investigated in the batch experiments.The influences of the nano-ferric oxide content in beads，cross-linking time, solution pH, initial U(VI) concentration, temperature and contact time on U(VI) sorption were studied. The results indicated that the adsorption capacities are strongly affected by the solution pH, the best adsorption rate can be thought of to be at pH 3. The adsorption was rather fast in the initial 1.5 h, and the equilibrium was established in 9 h with the sorption capacity 2.64 mg/g. The kinetic adsorption data was simulated better by a pseudo-second-order equation. The removal rate increased slowly with temperature ascending . The adsorption process conformed to the Langmuir and Freundlich isothermal adsorption models, and the data fitted the latter better.

Abstract: We perform a study of the waste water from overflow in the Zhenjiang Neijiang . Determine content of COD、NH3-N、TP which changing along the distance at different water levels . Based on the SPSS14.0 correlation analysis , single factor pollution index and the comprehensive pollution index we study water movement rule and quality assessment. The results showed that : At low water level COD、NH3-N、TP decrease alleviation, the whole datum are high; at high water level COD、NH3-N、TP decrease greatly between 0~7m,but decrease alleviation between 7~200m. (2) Only the content of NH3-N (0~7m ) has significant differences (p<0.05),the other content all has not significant differences (p>0.05), the waste water from overflow was seriously polluted so that the wetland can not purify it adequately. (3)Based on the Vwater quality grade standard, at low water level the content of COD、NH3-N、TP(0~200m ) are all beyond standard; at high water level the content of COD、NH3-N、TP(80~200m ) are all beyond standard; the order of the potential ecological rick is: NH3-N>TP>COD. The study on the datum could offer a favorable plan for purifying the waste water from overflow in the Zhenjiang Neijiang. Keyword: overflow; water movement rule; correlation analysis; water quality assessment

Abstract: Based on the method of high performance liquid chromatography - diode array detector (HPLC - DAD) ,this experiment rapidly detected rhodamine B of Chinese wolfberry from market sale. Rhodamine B in the samples was dissolved by hexane.And after it was evaporated, it was extracted quantitatively.And then rhodamine B was measured with high performance liquid chromatography (HPLC) detector, using external standard method of peak area for quantitation. Results showed that the test conditions: 80 percent methanol and 20 percent water as mobile phase; sample volume was 20 μL ; column temperature was 35 degree centigrade; the flow rate was 1.0 ml per min and detection wavelength of 545nm, a reference to the wavelength of 600nm.Rhodamine B of the linear correlation coefficient was 0.9998 between the concentration of 0.06 and 0.20μg per ml. The stability of the method was in the range of 2.4 percent to 3.3 percent, precision was about 1.60 percent, recovery rate determination results were between 85.75 percent and 103.80 percent,The positive rate of rhodamine B was 80 percent. This method has the advantages of simple, rapid and accurate, and is very suitable for the determination of rhodamine B in Chinese wolfberry.

Abstract: A novel large-sized macroporous silica was chemically modified and employed as support for immobilization of laccase. The immobilized laccase was applied to the degradation of 2-chlorophenol (2-CP). The biodegradation conditions such as degradation time, pH, temperature and initial concentration of 2-CP were investigated. Under the optimized conditions, it was found that a maximum of 96.4% of 2-CP could be removed after 5 h.

Abstract: It is showed that in the buffer solution of Tris-HCl (pH=8.50), the presence of SDBS could enhance the fluorescence of AAT, and the enhanced level is linear with the concentration of amaranth in a certain range. The detection limit of amaranth is 3.27×10^-7mol·mL^-1.The linear range of amaranth is 1.00×10^-7- 1.00×10^-3mol·L^-1 with R =0.9920. At the same time, its mechanism is discussed by resonance light scattering and absorption spectra. Compared with other analysis methods for amaranth which have been reported, this method has a relatively wider linear range and higher sensitivity.

Abstract: In recent years, China's air pollution control achieved great results, but for various reasons,the situation faced by the atmospheric environment in China is still very grim. Total emissions of air pollutants are high. It can be said that air pollution is still serious, it is still the major environmental problems we solved.