http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kim, J.-H.,Okour, Y.,Yang, H. S.,Kim, J. B.,Shon, H. K. American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.2
<P>This study aimed to prepare and characterise titanium dioxide (TiO2) nanoparticles and titanate nanotubes produced from Ti-sat flocculated sludge with drinking water (DW) and seawater (SW). The Ti-salt flocculated sludge from DW and SW was incinerated at 600 degrees C to produce TiO2 nanoparticles. XRD results showed that the anatase TiO2 structure was predominant for TiO2 from DW (TiO2-DW) and TiO2 from SW (TiO2-SW), which were mainly doped with carbon atoms. Titanate nanotubes (tiNT) were obtained when TiO2-DW and TiO2-SW were hydrothermally treated with NaOH solution. Structure phase, shape, crystallisation and photocatalytic activity of tiNT were affected by the incineration temperature and the amount of sodium present in different tiNT. The tiNT doped with thiourea incinerated at 600 degrees C presented anatase phase, showing a high increase of the degree of crystallisation with nanotube-like structures. The photocatalytic activity of these photocatalysts was evaluated using photooxidation of gaseous acetaldehyde. Thiourea doped tiNT-DW and tiNT-SW showed similar photocatalytic activity compared to commercially available TiO2-P25 under UV light and indicated a photocatalytic activity under visible light.</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.
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>
El Saliby, Ibrahim J.,Okour, Yosef H.,Shon, Ho K.,Vigneswaran, Saravanamuthu,Kandasamy, Jaya,Kim, J.-H. De Gruyter 2009 Journal of advanced oxidation technologies Vol.12 No.2
<P><B>Abstract</B></P><P>In this study, the effect of washing TiO<SUB>2</SUB>produced from flocculated sludge was investigated. Produced TiO<SUB>2</SUB>was washed with HCl, NaOH and Milli-Q-water and the washed TiO<SUB>2</SUB>was then characterized in terms of X-ray diffraction imaging, scanning electron microscope/energy dispersive using X-ray analysis and surface area. Washed TiO<SUB>2</SUB>was tested for adsorption and photocatalytic oxidation of acetaldehyde, and the decomposition of organics from synthetic wastewater (SWW) in terms of total organic carbon (TOC) and absorbance at UV-254. Results revealed that the anatase structure was dominant and TiO<SUB>2</SUB>was mainly doped with C atoms. The surface area of TiO<SUB>2</SUB>generated form TiCl<SUB>4</SUB>flocculation was found to be twice larger than the TiO<SUB>2</SUB>generated from Ti(SO<SUB>4</SUB>)<SUB>2</SUB>flocculation. Acid and base washings of TiO<SUB>2</SUB>improved its photocatalytic ability in decomposing acetaldehyde under UV-irradiation. Similarly, acid, base and Milli-Q water washings of TiO<SUB>2</SUB>were better in reducing TOC and humic acids from SWW.</P>
El Saliby, I.,Okour, Y.,Shon, H.K.,Kandasamy, J.,Lee, W.E.,Kim, J.H. Korean Society of Industrial and Engineering Chemi 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 TiO<SUB>2</SUB> nanoparticles have been successfully synthesised from the calcination of the TiCl<SUB>4</SUB> flocculated sludge. A conventional hydrothermal method was adopted to produce anatase nanofibres (calcined at 600<SUP>o</SUP>C) from TiO<SUB>2</SUB> 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.
The Effect of Corporate Social Responsibility Disclosure on Market Performance: Evidence from Jordan
Omar ZRAQAT,Qasim ZUREIGAT,Hani Ali AL-RAWASHDEH,Samer Mohammed OKOUR,Lina Fuad HUSSIEN,Atef Aqeel AL-BAWAB 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.8
The current study aims to investigate the relationship between CSRD and firm performance, as an indicator for corporate socially responsible behavior, and corporate market performance of listed companies on the Amman stock exchange (ASE). The study adopts a quantitative methodology and utilizes pooled data sets that was collected following content analysis approach of the annual reports for the period 2014 to 2019. The study sample consists of 42 listed companies. The study ran a multiple regression model in order to capture the relationship between the independent variable CSRD and the dependent variable that is Firm performance which was measured using Tobin’s Q. The study also utilized five control variables in order to control the hypothesized relationship between CSRD and Firm Performance. The results indicate a negative but significant relationship between CSRD and corporate market performance measured by Tobin’s Q. The results stand against the notion of the business case for CSR, and indicate the opposite position, so, the higher CSRD, the lower will be Tobin’s Q. Such results support the notion of the institutional theory, and provide an initial evidence for legitimacy seeking behavior in Jordanian companies. However, the results indicate a lower level of awareness of CSR across investors and market players, which support arguments of the difference in market perceptions towards CSR.