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Gao H.,Scientific Research Academy of Guangxi Environmental Protection | Yang Y.,Chinese Research Academy of Environmental Sciences | Huang Q.,Chinese Research Academy of Environmental Sciences | Wang Q.,Chinese Research Academy of Environmental Sciences
Journal of Material Cycles and Waste Management | Year: 2015

Disposal of waste CRT glass is now an urgent environmental protection issue. We collected waste CRT glass from monochrome and color television sets, analyzed their chemical compositions using X-ray fluorescence, and studied the leaching characteristics of Pb in the glass using sulfuric and nitric acids and acetic acid buffer leaching toxicity tests. The results showed that the order of the Pb leaching levels was color panel glass < monochrome glass < color funnel glass. The average Pb concentrations leached in sulfuric and nitric acids from color funnel and panel glasses and from monochrome funnel and panel glasses did not exceed the regulatory limits for Pb according to the China Identification Standards for Hazardous Waste—Identification for Extraction Toxicity. Only the average concentration of Pb leached in acetic acid buffer from color funnel glass exceeded the regulatory levels for Pb while those from other glasses were lower than 1 mg/L. Monochrome panel and funnel glasses and color panel glass can be disposed off as common industrial solid waste or co-disposed off with municipal solid waste. Color funnel glass, however, should be managed and disposed off in strict conformity with the requirements for hazardous waste disposal. © 2015 Springer Japan Source

Diao M.,Scientific Research Academy of Guangxi Environmental Protection | Diao M.,University of Queensland | Nguyen T.A.H.,University of Queensland | Taran E.,University of Queensland | And 2 more authors.
Colloids and Surfaces B: Biointerfaces | Year: 2015

The surface appendages and extracellular polymeric substances of cells play an important role in the bacterial adhesion process. In this work, colloidal forces and nanomechanical properties of Acidithiobacillus ferrooxidans (A. f) interacted with silicon wafer and pyrite (FeS2) surfaces in solutions of varying salt concentrations were quantitatively examined using the bacterial probe technique with atomic force microscopy. A. f cells were cultured with either ferrous sulfate or elemental sulfur as key energy sources. Our results show that A. f cells grown with ferrous ion and elemental sulfur exhibit distinctive retraction force vs separation distance curves with stair-step and saw tooth shapes, respectively. During the approach of bacterial probes to the substrate surfaces, surface appendages and biopolymers of cells are sequentially compressed. The conformations of surface appendages and biopolymers are significantly influenced by the salt concentrations. © 2015 Elsevier B.V. Source

Die Q.,Chinese Research Academy of Environmental Sciences | Die Q.,Beijing Normal University | Nie Z.,Chinese Research Academy of Environmental Sciences | Liu F.,Chinese Research Academy of Environmental Sciences | And 6 more authors.
Atmospheric Environment | Year: 2015

Gas and particle phase air samples were collected in summer and winter around industrial sites in Shanghai, China, to allow the concentrations, profiles, and gas-particle partitioning of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl-PCBs) to be determined. The total 2,3,7,8-substituted PCDD/F and dl-PCB toxic equivalent (TEQ) concentrations were 14.2-182 fg TEQ/m3 (mean 56.8 fg TEQ/m3) in summer and 21.9-479 fg TEQ/m3 (mean 145 fg TEQ/m3) in winter. The PCDD/Fs tended to be predominantly in the particulate phase, while the dl-PCBs were predominantly found in the gas phase, and the proportions of all of the PCDD/F and dl-PCB congeners in the particle phase increased as the temperature decreased. The logarithms of the gas-particle partition coefficients correlated well with the subcooled liquid vapor pressures of the PCDD/Fs and dl-PCBs for most of the samples. Gas-particle partitioning of the PCDD/Fs deviated from equilibrium either in summer or winter close to local sources, and the Junge-Pankow model and predictions made using a model based on the octanol-air partition coefficient fitted the measured particulate PCDD/F fractions well, indicating that absorption and adsorption mechanism both contributed to the partitioning process. However, gas-particle equilibrium of the dl-PCBs was reached more easily in winter than in summer. The Junge-Pankow model predictions fitted the dl-PCB data better than did the predictions made using the model based on the octanol-air partition coefficient, indicating that adsorption mechanism made dominated contribution to the partitioning process. © 2015 Elsevier Ltd. Source

Mo Y.-Y.,Guangxi University | Tang Y.-K.,Guangxi University | Wang S.-Y.,Guangxi University | Lin J.-M.,Guangxi University | And 2 more authors.
Materials Letters | Year: 2015

Silver nanoparticles(Ag-NPs) are synthetized successfully by using leaf extract of eucalyptus. The Ag-NPs obtained are characterized by ultraviolet-visible (UV-vis) spectrometer, field emission transmission electron microscopy (FE-TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). FE-TEM analysis revealed the shape of those Ag-NPs being spherical morphologies, with the size range of 4-60 nm. FTIR spectrum assumed the polyphenols and proteins act as reducing and stabilizing agents in the synthesis of Ag-NPs. © 2015 Elsevier B.V. Source

Zhang D.,Guangxi University | Wang Y.,Guangxi University | Yu K.,Guangxi University | Li P.,Guangxi University | And 2 more authors.
Bulletin of Environmental Contamination and Toxicology | Year: 2014

The Lijiang River is a typical karst river of southwestern China. Karst-aquifer systems are more vulnerable to contamination compared to other types of aquifers. The occurrence and distribution of organochlorine pesticides (OCPs) in surface sediments from the Lijiang River were investigated to evaluate their potential ecological risks. The total concentrations of them in sediments ranged from 0.80 to 18.73 ng/g dry weight (dw) (mean 6.83 ng/g dw). The residue levels of OCPs varied in the order of HCB > HCHs > DDTs. Compositional analyses of OCPs showed that HCHs and DDTs were mainly from historical usage. The ecological risk assessment suggested that HCHs and DDTs in Lijiang River sediments may cause adverse ecological risks, particularly at sites near agricultural areas. © 2014 Springer Science+Business Media New York. Source

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