Synthesis process and photocatalytic properties of BiOBr nanosheets for gaseous benzene.

A series of nano-BiOBr were prepared by an effective hydrothermal method in the presence of cetyltrimethyl ammonium bromide (CTAB) and ethanol at different calcination temperatures. The as-prepared nano-BiOBr samples were characterized by measuring the specific area (S BET), UV-Vis diffuse reflectance spectrum, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The results show that the calcination temperature has an important impact on the morphology and microstructure of BiOBr.

[Fouling behavior of sodium alginate during microfiltration at various ionic compositions: XDLVO approach].

The extended Derjaguin-Laudau-Verwey-Overbeek (XDLVO) theory was utilized to quantitatively evaluate short-range interfacial interactions involved in microfiltration (MF) membrane fouling by sodium alginate (SA) at various ionic compositions. Results showed that for hydrophilic membrane surfaces, van der Waals interactions facilitated fouling, whereas acid-base interactions alleviated fouling; for hydrophobic membrane surfaces, however, van der Waals interactions mitigated fouling and acid-base interactions turned out to be favorable for fouling. Electrostatic double layer interactions contributed minimally to fouling when SA molecules came into contact with MF membrane surface.

[Characteristics of dioxin-like polychlorinated biphenyls contamination in soils of Gudao Region in Dongying].

To investigate pollution characteristics of dioxin-like polychlorinated biphenyls (DL-PCBs) in Gudao Region, Dongying City, twenty surface soil samples were collected in April, 2011. The DL-PCBs in soil samples were determined by Soxhelt extraction-Florisil purification-Gas Chromatography(GC)-Electron Capture Detector (ECD). The concentration of DL-PCBs in surface soils ranged from 1.

Nanopaper based on Ag/TiO2 nanobelts heterostructure for continuous-flow photocatalytic treatment of liquid and gas phase pollutants.

The Ag/TiO(2) nanobelt heterostructures were prepared by the acid-assisted hydrothermal method followed by an in situ photo-reduction process. The photocatalytic activity of TiO(2) nanobelts was evidently enhanced by the heterostructures between Ag nanoparticles and TiO(2) nanobelts. The nanopapers based on Ag/TiO(2) nanobelt heterostructures were fabricated via a modified paper-making process.

Size distribution and seasonal variations of particle-associated organochlorine pesticides in Jinan, China.

The concentrations of organochlorine pesticides (OCPs) in atmospheric particulate matter in Jinan, China, over the period from July 2009 to June 2010, were determined to study their pollution levels, compositions, size distribution and seasonal variations. All target compounds except endosulfan sulfate were detected. The annual average concentration of ∑18 OCPs was 92 ± 82 pg m(-3).

Analysis of the surface ozone during summer and autumn at a coastal site in East China.

The levels and temporal variations of surface ozone at a coastal site in East China during summer and autumn were analyzed and the influences of meteorological parameters on ozone were investigated. An inland city was chosen as a comparison site. The main results and conclusions of this study are: (1) ozone pollution, with a maximum 1 h concentration of 150.

Analysis of observed ozone episode in urban Jinan, China.

Using a trajectory model (HYSPLIT) analyzed the ozone episodes observed at urban Jinan in 2005. There were 84 h (in 24 days) of ozone episodes (>100 ppbv) observed during the study. June was the most polluted month in the year.

Surface ozone and meteorological condition in a single year at an urban site in central-eastern China.

Surface ozone and some meteorological parameters were continuously measured from June 2003 to May 2004 at urban Jinan, China. The levels and variations of surface ozone were studied and the influences of meteorological parameters on ozone were analyzed. Annual and diurnal ozone variation patterns in Jinan both show a typical pattern for polluted urban areas.

[Photo-catalytic degradation of gas phase benzene and toluene over multi-composite TiO2 catalyst].

Photo-catalytic degradation of gas-phase benzene and toluene were studied in the condition of no catalyst, pure anatase catalyst, pure rutile catalyst and multi-composite catalyst. The influences of initial concentration of reactants and the catalysts of different composite on photo-catalytic degradation rate of gas-phase benzene and toluene were investigated. The results show that the degradation efficiency of benzene and toluene is improved a lot on anatase catalyst, but improved a little on rutile catalyst in relation to the crystal-structure of anatase and rutile catalyst.

[Characteristics of atmospheric ozone in the urban area of Ji'nan].

Based on the observational data of near surface O3 in the urban area of Ji'nan during the latest two years, the O3 concentrations and their temporal variation characteristics were analyzed. The results showed that O3 concentrations fluctuated periodically,and the photochemical pollution in Ji'nan was serious. Diurnal variations of ozone concentrations exhibited with the characteristic of a single peak, and showed the maximum in the afternoon and minimum in the early morning before sunrise.

[Ozone pollution, influence factors and their correlation at urban area in summer].

Based on the observational data of near surface O3, NO, NO2, CO and meteorological factors in the urban area of Ji'nan during summer 2003, the 03 concentrations and their temporal variation characteristics were studied. The correlation between O3 and its precursors (NO, NO2, CO) and related meteorological factors (solar radiation, temperature) was analyzed. The results show that O3 pollution during summer was very serious in Ji'nan, and the levels of O3, NO, NO2, NOx and CO were quite high during the observational period.

[Ozone and carbon monoxide concentration distribution on Taishan Mountain].

The concentrations of ozone (O3) and carbon monoxide (CO) on the top of Taishan Mountain were monitored, and the variations and correlation were studied. The results show that the frequency of O3 hourly concentrations more than the first-degree of National Ambient Air Quality Standard(GB-3095-1996, NAAQS) was 15.81%, and the frequency of CO concentrations more than the first-degree of NAAQS was zero.

[Ozone concentration distribution of urban].

The increase of ozone concentration in urban is one of the most important research topics on environmental science. With the increase of nitrogen oxides and hydrogen-carbon compounds which are exhausted from cars, the ozone concentration in urban is obviously increased on sunlight, and threat of photochemistry smog will be possible. Therefore, it is very important to monitor and study the ozone concentration distribution in urban.