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The simultaneous photocatalytic degradation of phenol and reduction of Cr(VI) by TiO2/CNTs
Langhuan Huang,Qizhong Chan,Xiaojing Wu,Houjin Wang,Yingliang Liu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
The main objective of this paper is to verify the potential of TiO2/CNTs in the simultaneous photocatalytic degradation of phenol and reduction of Cr(VI). From the present results it can be concluded that there is a synergistic effect between the photocatalytic degradation of phenol and reduction of Cr(VI). Under all tested conditions, the degradation of phenol and reduction of Cr(VI) were examined to follow pseudofirst-order kinetic. The rate constant of 40 mg/L of Cr(VI) was evaluated as 4.34 103 min1 in the absence of phenol, and was increased up to 9.27 103 min1 by adding 10 mg/L of phenol, and to 10.73 103 min1 by adding 15 mg/L of phenol. The presence of Cr(VI) also accelerated the degradation process of phenol, with a factor of 1.84–3 times. Such a great synergistic effect was likely to be attributed to two kinds of effects from CNTs: adsorption effect and electron trap effect. The synergistic effect induced by CNTs was also confirmed by the detection of degradation intermediates of phenol.
Jilin Hu,Qizhong Huang,Hongxia Peng,Xiuying Tian,Zhanjun Chen,Yangxi Peng 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.3
Aluminium oxide (Al2O3)-aluminium nitride (AlN) composites were prepared at 1500-1600 oC by pressureless sintering. Themain raw materials used were AlN and Al2O3, and appropriate amounts of TiO2-Y2O3-CaO-La2O3 quaternary sintering aidswere added. The effects of different AlN contents and sintering temperatures on the bulk density, bending strength, Rockwellhardness, thermal conductivity, and other properties of Al2O3-based ceramics were studied. The phase composition andmicrostructure of the samples were analysed with an X-ray diffractometer and scanning electron microscope. Results showedthat the Al2O3-AlN composites had excellent overall performance in terms of a flexural strength of 295.7MPa, a Rockwellhardness of 61.5 HRA, and a thermal conductivity of 38.8W/(m·K) (at 25 oC) after pressureless sintering at 1600 oC for 3 hwith 10 wt% AlN content. These properties met the requirements of high-power ceramic LED lamp holders. The Al2O3-10 wt%AlN composites sintered at 1600 oC had a dense microstructure, tight bonding among grains, and few pores, whichexplained the excellent performance of the samples.
Chen, Jianxun,Huang, Qizhong Korean Carbon Society 2006 Carbon Letters Vol.7 No.4
Carbon/Carbon composite was been manufactured by the technology of warmer-molding process of clutter chopped carbon fiber, using phenolic resin as an adhesive. The degree of graphitization, the microstructure and the friction properties were studied. The results show that the clutter chopped carbon fiber fully scatter in the Carbon/Carbon composite and the degree of graphitization of phenolic resin can reach up to 86.2%, this matrix carbon can form the continuous and stable graphitic thin film on the friction surface during braking process so that the composite has fine friction properties and low wear rate.
Jianxun Chen,Qizhong Huang 한국탄소학회 2006 Carbon Letters Vol.7 No.4
Carbon/Carbon composite was been manufactured by the technology of warmer-molding process of clutter chopped carbon fiber, using phenolic resin as an adhesive. The degree of graphitization, the microstructure and the friction properties were studied. The results show that the clutter chopped carbon fiber fully scatter in the Carbon/Carbon composite and the degree of graphitization of phenolic resin can reach up to 86.2%, this matrix carbon can form the continuous and stable graphitic thin film on the friction surface during braking process so that the composite has fine friction properties and low wear rate.