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Wang G.,Sun Yat Sen University | Wang G.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | Guan D.-S.,Sun Yat Sen University | Guan D.-S.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology
Chinese Journal of Applied Ecology | Year: 2012

By using Landsat-5 TM images, the land surface temperature (LST), vegetation cover, and normalized difference moisture index (NDMI) in different areas of Guangzhou were extracted, and the effects of vegetation cover and NDMI on the land surface temperature of the City were studied, based on the landscape ecological methodologies. There existed good linear correlations among the vegetation cover, land surface temperature, and NDMI, but the correlation coefficients for any two of the three items differed obviously with different areas. If the vegetation cover in different areas of Guangzhou was improved to the same level, urban center had the best cooling effect, followed by the suburbs in the north edge of urban center. The forest parks in different areas of the City also had different cooling effect on the surrounding environment. The difference of the average temperature between the 960-1080 m buffer zone and the inner park were 4.69°C in Baiyun Mountain, 1.27°C in Mazaishan, and 0.41°C in Liuxihe. High vegetation cover could increase the thermal landscape heterogeneity and the aggregation among different landscapes, and promote the energy exchange between the lower temperature patches and higher temperature patches, playing an important role in controlling hot island effect. NDMI and vegetation cover had the same effects on the formation of thermal landscape pattern. Source


Yang Y.-X.,Sun Yat Sen University | Yang Y.-X.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | Lu H.-L.,Sun Yat Sen University | Lu H.-L.,Guangdong Academy of Environmental Science | And 12 more authors.
Chinese Journal of Applied Ecology | Year: 2013

A five-year field trial was conducted at the surrounding area of Dabao Mountain Mine to explore the feasibility and availability of using kenaf (Hibiscus cannabinus), a fiber crop with strong heavy metals tolerance and potential economic value, to reclaim the multi-metal contaminated acidic farmland soil. Different amendments were applied prior to the kenaf planting to evaluate their effects on the soil properties and kenaf growth. After the amendments application, the kenaf could grow well on the heavy metals contaminated soil with the Pb, Zn, Cu, Cd, and As concentrations being 1600, 440, 640, 7.6, and 850 mg · kg-1, respectively. Among the amendments, dolomite and fly ash had better effects than limestone and organic fertilizer. With the application of dolomite and fly ash, the aboveground dry mass production of kenaf reached 14-15 t · hm-2, which was similar to that on normal soils, and the heavy metal concentrations in the bast fiber and stem of kenaf decreased significantly, as compared with the control. The mass of the bast fiber accounted for 32%-38% of the shoot production, and the extractable heavy metal concentrations in the bast fiber could meet the standard of 'technical specifications of ecological textiles'in China, suggesting that the bast fiber had potential economic value. It was suggested that planting kenaf combining with dolomite/fly ash application could be an effective measure to reclaim the multi-metal contaminated acidic farmland soil. Source


Chen K.,Sun Yat Sen University | Chen K.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | Zhang Z.-L.,Sun Yat Sen University | Zhang Z.-L.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | And 4 more authors.
Sensors (Switzerland) | Year: 2013

A glassy carbon electrode (GCE) coated with a graphene/polymer film was fabricated for rapid determination of phenols in aqueous solutions. The electrochemical behavior of different phenols at the graphene/polymer-coated GCE was also investigated. In PBS buffer solution with a pH of 6.5, hydroquinone exhibits a well-defined reduction peak at the modified GCE. Based on this, an electrochemical method for the direct determination of phenols is proposed. Investigating different parameters revealed the optimized detection conditions for the electrode are a scan rate of 50 mV/s, dosage of graphene-polyaniline of 8 μL, dosage of tyrosinase of 3 μL, and pH of 6.5. Under the optimal conditions, the reduction peak current varies linearly with the concentration of phenols, with a linear regression equation of I (10-6A) = -4.887 × 10-4C (mol/L)-5.331 × 10-6 with a correlation coefficient of 0.9963 and limit of detection (S/N = 3) of 2.00 × 10-4 mol/L. The electrochemical sensor is also used to detect phenols in actual samples, where it shows great promise for rapid, simple and quantitative detection of phenols. © 2013 by the authors; licensee MDPI, Basel, Switzerland. Source


Yu K.-S.,Sun Yat Sen University | Yu K.-S.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | Shi J.-Y.,Sun Yat Sen University | Zhang Z.-L.,Sun Yat Sen University | And 5 more authors.
Journal of Nanomaterials | Year: 2013

ZnO and Er-doped ZnO with different molar ratios of Er/Zn were prepared using the homogeneous precipitation method. The photocatalysts prepared were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), UV-vis spectroscopy, and photoluminescence spectroscopy. The results showed that the Er-doped ZnO displayed characteristic wurtzite-type peaks in the XRD spectra. The Er-doped ZnO absorbed much more light than ZnO in the ultraviolet region. And the doping of Er into ZnO enhanced the intensity of the fluorescence emission. The degradation of methylene blue (MB) solution demonstrated that the photocatalytic activity of ZnO was significantly improved with Er doping. © 2013 Kai-sheng Yu et al. Source


Zhang Z.-L.,Sun Yat Sen University | Zhang Z.-L.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | Zhang L.,Sun Yat Sen University | Zhang L.,Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology | And 8 more authors.
Journal of Environmental Chemical Engineering | Year: 2013

A pilot-scale study was carried out to evaluate the in situ anaerobic digestion of nutrient-deficient activated sludge (AS) from southern China. A single and two-stage system were compared and the performance of ultrasound pretreatment and co-digestion with kitchen garbage was evaluated by comparing volatile solids removal and biogas production. The results showed that two-stage systems performed better than single-stage systems at high feeding concentration and short retention time. Ultrasonic pretreatment significantly enhanced sludge solubilization though cell lysis and subsequently increased biogas yields. Mixture with kitchen garbage resulted in substantial volatile solids reductions in both single and two-stage systems of up to 47% as well as significant increases in biogas yields. Processes including digestion, dewatering, drying and incineration of this type of sludge were proposed, and mass balance calculation showed that these processes were feasible and had the potential to provide environmental and economic benefits for wastewater treatment plants in southern China. © 2013 Elsevier Ltd All rights reserved. Source

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