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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.
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Liujun Shi,Wei Hu,Yongjin He,Yu Ke,Gang Wu,Meng Xiao,Langhuan Huang,Shaozao Tan 한국고분자학회 2020 Macromolecular Research Vol.28 No.4
Amphiphilic triblock copolymers, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) as a hydrophobic block and poly(ethylene glycol) (PEG) as a hydrophilic block, were successfully synthesized, with an aim to broaden the potential application of PHBV in biomedical areas. Isophorone diisocyanate having two different reactive isocyanate groups was used as the coupling agent. Telechelic hydroxylated PHBV was prepared by alcoholysis reaction, isocyanate modified and finally reacted with PEG. Molecular weight of triblock copolymer increased with the increasing molecular weight of PHBV-diol and PEG. The length of the PHBV block and PEG block had a great influence on the crystallization behavior of the triblock copolymers. Thermal degradation temperature of PHBV segment enhanced greatly. The triblock copolymer showed a tendency toward formation of aggregation in aqueous solution with a critical aggregation concentration of 5.01×10-4 g·L−1, and the rod-shape assembly with a uniform hydrophilic shell might be employed as hydrophobic drug delivery systems.
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