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Start Over Author "Rongfang, Li" Publisher iop publishing
2 results on '"Rongfang, Li"'

1. Facile Synthesis Gold-Polyindole-Reduced Graphene Oxide Ternary Nanocomposites with Enhanced Electrocatalytic Activity for the Electrochemical Sensing of Caffeine.

Author

Rongfang Li, Lei Yao, Zhongxia Wang, Weixin Lv, Wenjuan Wang, Fenying Kong, and Wei Wang

Subjects
GRAPHENE oxide, ELECTROCHEMICAL analysis
Abstract

An efficient and eco-friendly ultraviolet (UV) irradiation method was developed to synthesize a ternary nanocomposites of goldpolyindole-reduced graphene oxide (Au-PIn-RGO), and as-prepared nanomaterial was then used to fabricate an electrochemical caffeine (CAF) sensor. In the synthesis process, the polymerization of the indole monomer, the reduction of Au3+ ions and GO occurred simultaneously by UV irradiation without using any chemical reagents. The synthesis procedure was simple, inexpensive and green environmentally. Morphology, structure and composition of the Au-PIn-RGO nanocomposites were characterized by various technologies including UV-visible (UV-Vis) spectroscopy, fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the optimum conditions, a linear relationship existed between oxidation peak currents and the concentration of CAF in the range of 0.8-40 µM and 40-1000 µM, with a detection limit of 0.26 µM (S/N = 3). The proposed method was successfully applied to determine the CAF in beverages. [ABSTRACT FROM AUTHOR]

Published
2019
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2. Satellite observations make it possible to estimate Poyang Lake’s water budget

Author

Lian Feng, Chuanmin Hu, Rongfang Li, and Xiaoling Chen

Subjects
Hydrology, geography, geography.geographical_feature_category, Renewable Energy, Sustainability and the Environment, Public Health, Environmental and Occupational Health, Drainage basin, Water exchange, Environmental science, Satellite, Satellite imagery, Outflow, Moderate-resolution imaging spectroradiometer, Precipitation, Water budget, General Environmental Science
Abstract

Using moderate resolution imaging spectroradiometer (MODIS) satellite imagery with hydrologic and meteorological data, we developed a box model to estimate the water exchange between Poyang Lake (the largest freshwater lake of China) and the Changjiang (Yangtze) River from 2000 to 2009. Significant intra- and inter-annual variability of the water budget was found, with an annual mean outflow of Poyang Lake of 120.2 ± 31.2 billion m3 during 2000–2009 and a declining trend of 5.7 billion m3 yr−1 (p = 0.09). The impoundment of the Three Gorges Dam (TGD) on the Changjiang River in June 2003 led to a rapid lake–river outflow of 760.6 million m3 day−1, resulting in a loss of 7864.5 million m3 of water from the lake in a short period. Shortly thereafter, a statistically significant decrease in the drainage basin’s runoff coefficient was discovered. These findings provide large-scale evidence on how local precipitation and the TGD control the lake’s water budget, where continuous monitoring using the established approach and satellite data may provide critical information to help make water management decisions.

Published
2011

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