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Sun D.,Dalian University | Han Y.,Dalian University | Gao S.,Low Carbon Technology | Zhang X.,Dalian University
Surface and Coatings Technology | Year: 2013

Titania-coated cobalt ferrite (TiO2/CoFe2O4) magnetic nano-photocatalysts were prepared by the hydrolysis of titanium tetrachloride in the presence of the CoFe2O4 magnetic particles. The photocatalysts were then modified by Ar, N2, and air plasmas. The crystal structures of the samples were characterized by X-ray diffraction. The active species in the plasma space were detected by optical emission spectroscopy (OES). The photocatalytic activities of the samples were evaluated by the photocatalytic degradation of methyl orange solution. The results indicated that the crystal structure of TiO2/CoFe2O4 was good, and that TiO2 exists in anatase and rutile forms. The photocatalytic activity of the sample modified by air plasma was higher than of that modified by N2 and Ar plasmas. The OES analyses of Ar, N2, and air plasmas confirmed that O active species played important roles in improving photocatalytic activity in the process of TiO2/CoFe2O4 modification by cold plasma. © 2012 Elsevier B.V. Source

Du X.,Shanxi Institute of Coal CAS Chemistry | Du X.,University of Chinese Academy of Sciences | Zhang R.,Shanxi Institute of Coal CAS Chemistry | Gan Z.,Low Carbon Technology | Bi J.,Shanxi Institute of Coal CAS Chemistry
Fuel | Year: 2013

Two kinds of coking wastewater were treated by supercritical water oxidation (SCWO) in a continuous-flow reactor using hydrogen peroxide (H 2O2) as an oxidant. These wastewater contained high concentrations of ammonia nitrogen (NH3-N), phenol, chemical oxygen demand (COD) and inorganic salts. A salt separator was applied for the separation of salts in the SCWO process to solve the problem of reactor plugging due to salt precipitation. Experiments were conducted to investigate the effects of the temperature, pressure, excess oxygen and residence time on the destruction of pollutants (includes NH3-N, phenol and COD). The efficiency of the salt separator was also investigated. Results showed that both phenol and COD can be easily destructed in SCWO process. NH3-N was inert and its conversion increased noticeably as the temperature and excess oxygen increased. At the condition of 650 °C and 300% excess oxygen, the conversions of all pollutants were over 99.94% and the effluent met the first grade discharge standard of China. The results also indicated that the efficiency of salt separation increased with an increasing temperature. By controlling the temperature of salt separator at 600 °C, more than 87% of the salts were separated from coking wastewater. © 2010 Elsevier Ltd. All rights reserved. Source

News Article | December 7, 2015
Site: http://www.greenbiz.com/

The Low Carbon Technology Partnership would help the world mitigate climate change and achieve sustainable development.

Deng Y.,Low Carbon Technology | Xu J.,Low Carbon Technology | Liu Y.,Technical and Economic Professional Committee of China Biogas Society | Mancl K.,Ohio State University
Renewable and Sustainable Energy Reviews | Year: 2014

Biogas technology has brought benefits to health, the environment, the economy and energy conservation. Vast biomass resources, including organic waste, have the potential for use as feedstock for biogas production in China. This paper presents the development status of biogas application in China. The goal was to provide quantitative information about biogas use, from villages to large cities, to assess the major characteristics of biogas application. Analysis of the opportunities and constraints of the different biogas applications provided the basis for policies for the development of biogas plants and for the adjustment of the scale of biogas development to match local requirements. Based on the characteristics of different biogas plants and geographic regions, a fuzzy analytic hierarchy process model was used to provide a suitability evaluation for development of the regional biogas industry. Results from this model could provide decision support for development strategies for regional distribution plans and the scale of biogas system construction. The findings can also aid further research on balancing energy supply and demand, energy policy formation, and the regional eco-environment development in China. © 2014 Elsevier Ltd. All rights reserved. Source

Zeng Y.,Tianjin Normal University | Zou R.,Low Carbon Technology | Zhao Y.,Nanyang Technological University
Advanced Materials | Year: 2016

As an emerging class of porous crystalline materials, covalent organic frameworks (COFs) are excellent candidates for various applications. In particular, they can serve as ideal platforms for capturing CO2 to mitigate the dilemma caused by the greenhouse effect. Recent research achievements using COFs for CO2 capture are highlighted. A background overview is provided, consisting of a brief statement on the current CO2 issue, a summary of representative materials utilized for CO2 capture, and an introduction to COFs. Research progresses on: i) experimental CO2 capture using different COFs synthesized based on different covalent bond formations, and ii) computational simulation results of such porous materials on CO2 capture are summarized. Based on these experimental and theoretical studies, careful analyses and discussions in terms of the COF stability, low- and high-pressure CO2 uptake, CO2 selectivity, breakthrough performance, and CO2 capture conditions are provided. Finally, a perspective and conclusion section of COFs for CO2 capture is presented. Recent advancements in the field are highlighted and the strategies and principals involved are discussed. Covalent organic frameworks (COFs) are excellent candidates for various important applications. Recent research progress on: i) experimental CO2 capture of different COFs according to the covalent bonds formed during the synthetic procedure, and ii) theoretical calculations of CO2 capture by COFs is highlighted. Analyses and discussions based on experimental and theoretical results are also provided. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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