Advanced Materials Research Vols. 1092-1093

Abstract: In recent years, with the aggravating of environmental pollution, the purification of carbon monoxide is currently a subject of interest. The catalytic oxidation method is an effective way. Manganese oxide nanoparticles were prepared by emulsion self-assembly method and then, synthetic and commercial manganese oxide-supported gold nanoparticle catalysts were successfully synthesized by the deposition-precipitation (DP) method. The catalysts were characterized by XRD, Raman, BET, ICP and HRTEM. The activity of the oxide and oxide-supported gold nanoparticle catalysts were evaluated on the fixed bed microreactor and Au/MnO_x had the highest activity. The intrinsic activity of Au/MnO_x at 35 °C is 0.81 mol_CO·mol^-1_Au·min^-1. Compared with O₂, CO concentration has bigger effect on the reaction activity.

Abstract: The hybrid-photocatalyst was successfully prepared by compositing graphene and TiO₂ in this thesis. The properties of the hybrid-photocatalyst was stydited by XRD, SEM. The hotocatalytic activity of the hybrid-photocatalyst was evaluated by decolorization of acid yellow dye solution under visible light irradiation. The result shows that the main phase of the hybrid-photocatalyst is antase TiO₂. The effects of different titanium carbon ratio, photocatalysis time, catalyst dosage and pH on the photocatalytic for acid yellow dye are discussed. Under the conditions that titanium carbon ratio 100:50, the photocatalytic time 120 min, catalyst dosing concentration 0.1g / L and the optimum pH 8, the treatment of methyl orange dye is the best.

Abstract: This paper analyzed the seasonal and vertical variations of cyanide in Jiaozhou Bay, and tried to reveal the transfer processes based on investigation data in different seasons in 1982. Results showed that cyanide contents in surface waters were showing obvious seasonal variations, and were in orders of spring < summer < autumn, due to the inputs of cyanide were mainly occurred in wet season. The vertical variations seem to be not regular, and the influences of cyanide contents in surface waters to bottom waters were not significant, because the degradation of cyanide were rapid in summer and early autumn, leading to most of the cyanide was degraded before or in the process of sedimentation.

Abstract: Time-space distribution characteristics of nitrogen in surface sediment from the Inner Mongolia of the Yellow River were investigated using the sequential extraction method. Sedimentary nitrogen were fractionized into four forms: ion exchange nitrogen (IEF-N), nitrogen combined with carbonate (CF-N), nitrogen combined with iron-manganese oxide (IMOF-N), organic nitrogen and combined with sulfides (OSF-N). The rank order according to the mean concentration of N-fraction in surface sediments from the Inner Mongolia of the Yellow River was OSF-N > IMOF-N > IEF-N > CF-N and the N-fraction content in surface sediments of autumn was higher than that of spring. Moreover, the different degrees of positive correlation between different morphological transformation nitrogen forms and the sum of TN, TP, CEC and organic matter of 12 sediment samples.

Abstract: Few study was about the fine particulate matter (PM_2.5) in Nanning. This paper analyzed the time-space distribution character and influences of PM_2.5 in Nanning. We collected data of 4 monitoring stations in 2013 year in Nanning, Guangxi. Our results showed that concentration of PM_2.5 in Nanning were Dec. > Jan > Oct. > Nov. > Mar. > Apr. = Sep. > Feb. > May = Aug. > June > July. The obvious hazy day occurred in winter and autumn. The monitoring stations located in the north suffered higher PM_2.5 pollution compared with the other stations. Concentration of PM_2.5 was significantly higher in the month when currents came from island than the month when currents from sea. The increased monthly concentration of PM_2.5 was associated with the northwest and northeast currents from inland. A combination of lower speed of wind, northwestly wind and regional transport made contribution to the evaluated PM_2.5 concentration.

Abstract: Four kinds of granular activated carbon GAC were treated by water taken from surface drinking-water sources in Ji’nan. Five adsorption performance indicators of granular activated carbon (GAC) were investigated. The correlation between the indicators and the removal rate of organic matter in raw water was analysed and the results showed that the removal rates of COD_Mn and DOC were well correlated with iodine value, the coefficient correlations, R² were 0.8745 and 0.8474 respectively, the removal rates of UV₂₅₄ was well correlated with methylene blue value (R² = 0.9454), indicating the capability as indicator for GAC selection. Additionally, one original GAC was used to adsorb organic matter in raw water, as well as the GAC samples treated with four different saturation time in raw water, to investigate the residue rate of adsorption ability. Of all five adsorption performance indicators, it was found that the iodine value, methylene blue value, and tannic acid were negatively related to the residual rate of the GAC absorption ability (R² was over 0.9). Based on the research, the activated carbon filters in Quehua Water plant in Ji’nan was evaluated and the replacement of them was suggested.

Abstract: This paper analyzed the content, distribution and source of Cu in Jiaozhou Bay in 1982. Results showed that the Cu contents in surface waters were relatively low, and the pollution level of Cu in 1982 was very slight. The major Cu source in the southwest of the bay was overland runoff; while for the northeast ocean current was responsible. The input contents of overland runoff and ocean current ranged from 2.22-3.56 μg.L^-1 and 0.15-5.31μg.L^-1, respectively.

Abstract: The Environment Kuznets Curve (EKC) hypothesis was applied to explore the relationship between economic growth and heavy metal pollution of lake sediments in Nansi Lake basin. The indicator of economic growth (IEG) was extracted from ten important economic indexes by the method of principal component analysis based on the data from 1978 to 2007. Some representative heavy metals including Hg, Cu, Br and Mn were chosen to analyze the level of heavy metals pollution in Nansi Lake basin. According to the previous research results that the deposition rate of Nansi Lake sediments was 3.5 mm/a, Kriging interpolation method was used to segment the 10.5cm core into 30 parts. The coupling results show that there is an inverted U-shaped curve between IEG and the element Br, half of an inverted U-shaped curve between IEG and Hg and Mn, and a N-shaped curve between IEG and Cu.

Abstract: This paper analyzed the content, distribution and source of Zn in Jiaozhou Bay in 1982. Results showed that the Zn contents in surface waters in April, June, July and October ranged from 1.75-167.71 μg.L^-1, 8.31-36.97 μg.L^-1, 7.05-12.18 μg.L^-1 and 1.75-5.25 μg.L^-1, respectively. Cu contents in most of the monitoring sites in April were meeting Grade III or Grade IV in National Sea Water Quality Standard (GB 3097-1997). While most of the monitoring sites in June, July and October were meeting Grade I or Grade II. The major Zn sources in the bay was overland runoff, ocean current, and deposition, whose input contents ranged from 37.90-167.71 μg.L^-1, 1.31-36.97μg.L^-1 and 1.75-12.18 μg.L^-1.

Abstract: This article mainly refers to purification technology and material technology of air purifiers. There are several purification technologies in air purifiers such as HEPA(high efficiency particulate air filter), Mineralization technology of ultra light structure, Negative ion technology, the photocatalyst technology, electrostatic dust collection, Activated carbon adsorption technology and etc. And material technologies are classified as Photocatalyst, Activated carbon, Synthetic fiber, HEPA, Negative ion generator and etc. The paper reviews the characteristics, purification theory, research status and applications of every kind of purification technologies and material technologies. On this basis, we put forward outlook on the future development of air purifier.