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41.
Ni‐Nanocluster Modified Black TiO2 with Dual Active Sites for Selective Photocatalytic CO2 Reduction
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Tadesse Billo Fang‐Yu Fu Putikam Raghunath Indrajit Shown Wei‐Fu Chen Hsiang‐Ting Lien Tzu‐Hsien Shen Jyh‐Fu Lee Ting‐Shan Chan Kuo‐You Huang Chih‐I Wu M. C. Lin Jih‐Shang Hwang Chih‐Hao Lee Li‐Chyong Chen Kuei‐Hsien Chen 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(2)
One of the key challenges in artificial photosynthesis is to design a photocatalyst that can bind and activate the CO2 molecule with the smallest possible activation energy and produce selective hydrocarbon products. In this contribution, a combined experimental and computational study on Ni‐nanocluster loaded black TiO2 (Ni/TiO2[Vo]) with built‐in dual active sites for selective photocatalytic CO2 conversion is reported. The findings reveal that the synergistic effects of deliberately induced Ni nanoclusters and oxygen vacancies provide (1) energetically stable CO2 binding sites with the lowest activation energy (0.08 eV), (2) highly reactive sites, (3) a fast electron transfer pathway, and (4) enhanced light harvesting by lowering the bandgap. The Ni/TiO2[Vo] photocatalyst has demonstrated highly selective and enhanced photocatalytic activity of more than 18 times higher solar fuel production than the commercial TiO2 (P‐25). An insight into the mechanisms of interfacial charge transfer and product formation is explored. 相似文献
42.
Omega-three fatty acids in purslane (Portulaca oleracea) Tissues 总被引:2,自引:0,他引:2
Thomas R. Omara-Alwala Tadesse Mebrahtu Debra E. Prior Michael O. Ezekwe 《Journal of the American Oil Chemists' Society》1991,68(3):198-199
Total lipids and omega-3 fatty acids in purslane(Portulaca oleracea) were determined in leaves, stems and whole plants at three ages. Significant differences (P<0.05) existed in levels of total
lipids among ages and between leaves and stems, but no relationship of age to plant part (>O5) was found. Contents of 18:3ω3,20:5ω3,
22:5ω3,22:6ω3,18:2ω6 and 18:loω9 showed that leaves were the richer source of omega-3 acids at each age. 相似文献
43.
An overview of construction and demolition waste management in Canada: a lifecycle analysis approach to sustainability 总被引:1,自引:1,他引:0
Muluken Yeheyis Kasun Hewage M. Shahria Alam Cigdem Eskicioglu Rehan Sadiq 《Clean Technologies and Environmental Policy》2013,15(1):81-91
The construction and demolition (C&D) waste generated by the Canadian construction industry accounts for 27 % of the total municipal solid waste disposed in landfills. However, it is evident that over 75 % of what the construction industry generates as waste has a residual value, and therefore could be recycled, salvaged and/or reused. The need for comprehensive and integrated waste management mechanisms, technologies, rating systems and policies is widely recognized. Owing to increasing C&D waste volumes, shortage of landfills and long-term adverse environmental, economic and social impacts of the disposed C&D waste, sustainable C&D waste management is becoming increasingly essential to protect public health and natural ecosystems. This paper proposes a conceptual C&D waste management framework to maximise the 3R (reduce, reuse and recycle) and minimise the disposal of construction waste by implementing sustainable and comprehensive strategy throughout the lifecycle of construction projects. In addition, a life cycle based C&D waste sustainability index is developed. This approach can be used to make decisions related to selection of material, sorting, recycle/reuse and treatment or disposal options for C&D waste. 相似文献
44.
Alemayehu Haddis Tadesse Getahun Embialle Mengistie Amana Jemal Ilse Smets Bart van der Bruggen 《Water and Environment Journal》2014,28(2):173-182
Rapid urbanization and industrialization, uncontrolled population growth, indiscriminate waste discharge and poor infrastructure are problems that African cities are facing. This paper describes an exemplary case study from Jimma, south‐west Ethiopia. A cross‐sectional study was conducted along the Awetu‐Kito drainage system in Jimma town to assess the level of pollution from urban dwellers and related activities. The study indicates that the Environmental Protection Agency (EPA) norms for biochemical oxygen demand (BOD), dissolved oxygen (DO) and orthophosphates are not met downstream of the major industrial and institutional activities. Small‐scale industries, Jimma University and residential areas contributed 50, 15 and 23% pollution load on the river, respectively. It can be concluded that the pollution effect in Jimma town is mainly as a result of the growing (uncontrolled) industrial activities and not to discharge of household wastewater. Given the same trends of urbanization and population growth, similar development (socio‐economic) indicators and similar climatic conditions, the key findings for Jimma are transferable to other mid‐sized African cities. 相似文献
45.
Ana F. Suzana Sizhan Liu Jiecheng Diao Longlong Wu Tadesse A. Assefa Milinda Abeykoon Ross Harder Wonsuk Cha Emil S. Bozin Ian K. Robinson 《Advanced functional materials》2023,33(19):2208012
When synthesized under certain conditions, barium titanate (BaTiO3, BTO) nanoparticles are found to have the non-thermodynamic cubic structure at room temperature. These particles also have a several-fold enhanced dielectric constant, sometimes exceeding 6000, and are widely used in thin-layer capacitors. A hydrothermal approach is used to synthesize BTO nanocrystals, which are characterized by a range of methods, including X-ray Rietveld refinement and the Williamson–Hall approach, revealing the presence of significant inhomogeneous strain associated with the cubic phase. However, X-ray pair distribution function measurements clearly show the local structure is lower symmetry than cubic. This apparent inconsistency is resolved by examining 3D Bragg coherent diffraction images of selected nanocrystals, which show the existence of ≈50 nm-sized domains, which are interpreted as tetragonal twins, and yet cause the average crystalline structure to appear cubic. The ability of these twin boundaries to migrate under the influence of electric fields explains the dielectric anomaly for the nanocrystalline phase. 相似文献