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Titania produced from Ti-salt flocculated sludge: photocatalytic activity under solar light.
Shon, Ho Kyong,Okour, Yousef,Park, Se Min,Kim, Jong Beom,Kim, Jong-Ho American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.8
<P>In this study, titania photocatalyst was produced from the wastewater sludge of Ti-salt flocculation. The high photocatalytic activity of titania reported was evaluated based on a single organic substrate. However, the photocatalytic activity is a substrate-specific; one photocatalyst showed different photocatalytic degradation rates for different substrates. Thus, to investigate the substrate-specific photocatalytic activity of titania, various substrates of humic acid (HA), dichloroacetic acid (DCA), rhodamine B (RhB), metsulfuron methyl (M&M) and phenol were used under simulated solar light irradiation. Results showed titania had a high activity rate for RhB, moderate activity for HA and DCA and low activity for M&M and phenol indicating substrate-specific activities. When compared with Degussa-P25, titania showed higher activity for M&M, while the opposite was observed for HA and phenol. The specific-substrate behaviour of titania could depend on specific physicochemical and electronic interactions between titania, substrates, and their intermediates compounds formed.</P>
Ibrahim El Saliby,Yousef Okour,Jaya Kandasamy,Woong Eui Lee,김종호,Ho Kyong Shon 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
In this study, dye and secondary effluent wastewaters were used to generate a non-hazardous sludge. Anatase TiO2 nanoparticles have been successfully synthesised from the calcination of the TiCl4flocculated sludge. A conventional hydrothermal method was adopted to produce anatase nanofibres (calcined at 600 8C) from TiO2 nanoparticles. X-ray diffraction, scanning electron microscopy and transmission electron microscopy investigations showed the highly crystalline nanoparticles and nanofibres after calcination. The size of nanofibres was related to the size of their nanoparticles precursors. Nanoparticles had larger surface area than nanofibres, lower pore volume and bigger pore diameter. Energy dispersive X-ray analysis revealed that impurities can be successfully removed by a subsequent hydrothermal/acid wash of nanoparticles. Nanoparticles had better overall photocatalytic activity for the degradation of organics in synthetic wastewater compared to nanofibres. On the other hand, nanofibres had a better adsorption capacity.
손호경,조동련,김경석,이휘지,나숙현,김종범,김종호,Shon, Hokyong,Phuntsho, Sherub,Okour, Yousef,Cho, Dong-Lyun,Kim, Kyoung Seok,Li, Hui-Jie,Na, Sukhyun,Kim, Jong Beom,Kim, Jong-Ho The Korean Society of Industrial and Engineering C 2008 공업화학 Vol.19 No.1
산화티탄은 가장 많이 연구된 반도체 산화물로 환경 정화와 에너지 생산에 응용이 크게 기대되고 있다. 공기와 물 속의 유해 유기물을 제거하고 물분해를 통한 수소 생산은 대표적인 응용 분야이다. 산화티탄의 저렴한 가격, 낮은 독성, 화학적 및 열적 안정성은 잘 알려진 장점이다. 그러나, 산화티탄의 단점은 가시광 영역에서 광촉매 활성이 낮다는 점이다. 이러한 문제점을 해결하기 위하여, 귀금속, 금속, 양이온, 음이온 도핑 방법으로 산화티탄의 표면과 전기적 구조를 변형시켜 가시광 영역에서 광촉매 활성을 높이기 위한 연구가 많이 진행되고 있다. 이번 총설에서는 산화티탄의 가시광 감응을 유도하는 방법에 대한 광범위한 정보를 정리하였다. Titanium dioxide ($TiO_2$) is one of the most researched semiconductor oxides that has revolutionised technologies in the field of environmental purification and energy generation. It has found extensive applications in heterogenous photocatalysis for removing organic pollutants from air and water and also in hydrogen production from photocatalytic water-splitting. Its use is popular because of its low cost, low toxicity, high chemical and thermal stability. But one of the critical limitations of $TiO_2$ as photocatalyst is its poor response to visible light. Several attempts have been made to modify the surface and electronic structures of $TiO_2$ to enhance its activity in the visible light region such as noble metal deposition, metal ion loading, cationic and anionic doping and sensitisation. Most of the results improved photocatalytic performance under visible light irradiation. This paper attempts to review and update some of the information on the $TiO_2$ photocatalytic technology and its accomplishment towards visible light region.