J Environ Sci Health A Tox Hazard Subst Environ Eng
a College of Earth & Environmental Sciences , University of the Punjab, Lahore, Pakistan.
Published: May 2014
The synthesis, characterization and photocatalytic performance of non-traditional Al₂O₃-TiO₂-based photocatalysts is reported. Al₂O₃-TiO₂ support was loaded with various fractions of CuO and ZrO₂. A sound agreement was observed between the bandgaps of synthesized powders measured by UV-Visible diffuse reflectance spectroscopy (DRS) in the solid phase and UV-Visible spectroscopy in the aqueous medium. X-ray diffraction (XRD) analysis revealed the composite nature of the catalysts with the retention of individual identity of each component. The average crystallite size of the individual component was found to be in the range of 20 to 40 nm. Scanning electron microscopy (SEM) analysis authenticated the presence of CuO and ZrO₂ at the surface of Al₂O₃-TiO₂ support, while Rutherford Back Scattering Spectroscopy (RBS) confirmed the quantity of the modifiers as per theoretical calculations. The composites showed an enhanced photocatalytic activity in sunlight compared to Al₂O₃-TiO₂ for the degradation of dyes. Efforts were made to elucidate the enhanced sunlight response of the synthesized composite catalysts compared to Al₂O₃-TiO₂. As monitored by ion chromatography (IC), the synthesized photocatalysts completely mineralized the dyes leaving behind inorganic ions in solution. The kinetics of photocatalytic degradation of dyes was evaluated for optimum correlation with the existing models. The stability of the photocatalysts against the photo-corrosion was monitored by analyzing the samples for respective metals in solution after sunlight exposure. Supplemental materials are available for this article. Go to the publisher's online edition of the Journal of Environmental Science and Health, Part A, to view the supplemental file.
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http://dx.doi.org/10.1080/10934529.2013.824789 | DOI Listing |
Angew Chem Int Ed Engl
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Hong Kong Polytechnic University, Applied Biology and Chemical Technology, 8/F Lee Shau Kee Building, The Hong Kong Polytechnic University, 00000, Hong Kong, HONG KONG.
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Department of Life Science and Agriculture, Zhoukou Normal University Zhoukou Henan 466001 China
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High-Tech Research and Development Center, Kim Il Sung University Pyongyang Democratic People's Republic of Korea
In this study, we synthesized a water-based, rosin-modified, polymerized oil (WRPO) an addition and polymerization reaction of dehydrated castor oil (DCO), rosin acid (RA), zinc resinate (ZR) and dehydrated castor oil acid (DCOA). Addition and polymerization reactions at 240 °C, followed by neutralization with ammonia, dissolution into butyl alcohol and subsequent dilution with water, were performed at varying DCOA contents of 10%, 20%, 30%, 35% and 40%. WRPO was mixed with butoxymethylmelamine (BMM), a curing agent, at a weight ratio of 80 : 20, and then cured for 2 hours at 130 °C.
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College of Chemical and Material Engineering, Quzhou University, Quzhou, Zhejiang Province, 324000, People's Republic of China.
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Department of Pharmaceutical Sciences, School of Pharmacy, Lebanese American University, Byblos, Lebanon.
Introduction: Androgenetic alopecia (AGA) is a multifactorial and age-related dermatological disease that affects both males and females, usually at older ages. Traditional hair repair drugs exemplified by minoxidil have limitations such as skin irritation and hypertrichosis. Thus, attention has been shifted to the use of repurposing drugs.
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