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- 저자 : Chitiphon Chuaicham (검색결과 2 건)
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Chitiphon Chuaicham,Takumi Inoue,Vellaichamy Balakumar,Quanzhi Tian,Keiko Sasaki 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
Visible active photocatalysts have attracted interest as a potentially efficient and sustainable approach forpollutant degradation treatment. In this work, ZnCr mixed metal oxide/fly ash (ZnCr-MMO/FA) compositeswere prepared using fly ash (FA) from China coal mining power plants to improve photocatalytic performance. The formation of the ZnCr-MMO/FA composites was proved by XRD results which showed thetwo-phases combination of FA and MMO. Also, the presence of FA in the ZnCr-MMO/FA composite provideda good arrangement of small particles of ZnCr-MMO on the surface of FA and higher light absorptionability with a lower energy bandgap compared with the pure ZnCr-MMO. The photocatalyticperformance of the prepared ZnCr-MMO and ZnCr-MMO/FA composites in different FA contents wasevaluated by degradation of ciprofloxacin (CIP), which is an antibiotic and often found in pharmaceuticalwastes, under visible light irradiation. Clearly, the ZnCr-MMO/FA composites showed higher photocatalyticdecomposition of CIP than pristine ZnCr-MMO, and the highest degradation performance for CIPwas obtained from the ZnCr-MMO/FA sample with 0.5 mg FA, which has a reaction rate constant approximatelyfour times greater than that of pure ZnCr-MMO. The improved CIP degradation activity of theZnCr-MMO/FA composite might not only be due to the good arrangement of ZnCr-MMO particles onthe FA surface but also high separation and less recombination of photogenerated electrons-holes pairs,proven by the photoluminescence spectra, photocurrent density, and electrochemical impedance spectroscopyresults. The lower recombination of the charge carriers of the ZnCr-MMO/FA composite mightbe caused by the heterojunction between the ZnCr-MMO as a main photocatalyst and FA. Thus, the proposedZnCr-MMO/FA composite can be used as an effective photocatalyst for wastewater treatment,including the decomposition of organic pollutants, such as discarded pharmaceuticals.
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Sanetuntikul, Jakkid,Chuaicham, Chitiphon,Choi, Young-Woo,Shanmugam, Sangaraju The Royal Society of Chemistry 2015 Journal of materials chemistry. A, Materials for e Vol.3 No.30
<▼1><P>The effect of nitrogen type and content along with metal doping in hollow carbon spheres on oxygen reduction activity is described.</P></▼1><▼2><P>The development of inexpensive non-precious oxygen reduction catalysts has become one of the most important efforts in polymer electrolyte membrane fuel cells. In this report, we synthesized a non-precious electrocatalyst from a single precursor, iron(iii) diethylene triaminepentaacetate, using a heat-treatment effect to prepare an active catalyst. A series of catalysts were prepared at different temperatures leading to different degrees of graphitization, heteroatom content and activity. In 0.1 M KOH electrolyte solution, the oxygen reduction reaction (ORR) onset potential of the HNCS71 catalyst was as high as 0.97 V, and half-wave potentials were only 20 mV lower than those for Pt/C. X-ray absorption measurements of the Fe K-edge showed the structure of Fe–N4 centers, formed in HNCS71, which were responsible for the ORR activity. An alkaline exchange membrane fuel cell fabricated with HNCS71 as the cathode was tested in a H2–O2 single cell and showed a maximum power density of ∼68 mW cm<SUP>−2</SUP>. The 100 hour fuel cell durability test of the HNCS71 cathode showed a decay in the current density of about 14% at 0.4 V. Therefore, the HNCS catalyst appears to be a promising new class of non-precious catalysts for fuel cell applications.</P></▼2>
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