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Minjia Meng,Yonghai Feng,Weisheng Guan,Yan Liu,Yanfang Xi,Yongsheng Yan 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Highly effective molecularly imprinted nano-polymer on wollastonite (nano-WMIP) was prepared byimprinting technique using oil-in-water emulsion polymerization in the presence of salicylic acid (SA) astemplate. The adsorption behavior of nano-WMIP including adsorption kinetic, isotherms, selectiveadsorption, recognition, and effects of initial pH, ionic strength, initial concentration, adsorptiontemperature, and amount of adsorbents were investigated in detail. Moreover, the selective recognitionof nano-WMIP was further investigated by HPLC toward analogs of SA. The relative selectivitycoefficients for p-HB, MS, and MP were 113.4, 8.049, and 6.239, respectively, showing that much higherselectivity of SA on nano-WMIP was obtained than that of wollastonite-based non-imprinted polymer(nano-WNIP).
Gas phase dehydration of glycerol catalyzed by rutile TiO_2-supported heteropolyacids
Lingqin Shen,Aili Wang,Hengbo Yin,Yonghai Feng,Longbao Yu,Tingshun Jiang,Yutang Shen,Zhanao Wu,박은덕 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
Gas phase dehydration of glycerol catalyzed by the rutile TiO2-supported heteropolyacids was investigated. The TiO_2-supported heteropolyacid catalysts were prepared by the incipient wetness impregnation method using silicotungstic, phosphotungstic, and phosphomolybdic acids as active compounds. The as-prepared catalysts were characterized by X-ray diffraction, infrared spectroscopy,temperature programmed desorption of ammonia, and surface area measurement. The heteropolyacids supported by rutile TiO_2 were crystallites. The catalytic activity of the catalysts in the gas phase dehydration of glycerol was significantly affected by the type and loading of heteropolyacids. TiO_2-supported silicotungstic acid (20 wt.%) catalyst showed the highest catalytic activity with an acrolein selectivity of 80 mol% at a conversion of glycerol of 99% and a reaction temperature of 280 8C under ambient pressure. The possible reaction route in the gas phase dehydration of glycerol catalyzed by the TiO_2-supported heteropolyacid catalysts was also discussed briefly.
Yujun Fu,Hengbo Yin,Yiqian Jiang,Lingqin Shen,Yonghai Feng,Aili Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Methylchlorophenyldichlorosilane (MeClPhSiCl2) and methyldichlorophenyldichlorosilane (MeCl2Ph-SiCl2) were synthesized by the catalytic chlorination of methylphenyldichlorosilane (MePhSiCl2) withCl2 over Lewis acid catalysts. The catalytic activities of Lewis acid catalysts were in an order ofFeCl3 > SbCl5 > AlCl3 > SnCl4. However, FeCl3 also highly catalyzed the cleavage of chlorophenyl–siliconbond to form chlorobenzene. At a low mole ratio of SbCl5 to MePhSiCl2 of 1.4 × 10-5:0.45, the yield ofMeClPhSiCl2 was around 60% after reacting at 25–100 8C for 15–20 h. At a high mole ratio of1.4 × 10-4:0.45, the yield of MeCl2PhSiCl2 reached 44% after reacting at 80–100℃ for 20 h.
Methylation of methyltrichlorosilane with methyl chloride over active metals and activated carbon
Yanjun Liu,Yiqian Jiang,Weiguang Chen,Yutang Shen,Yonghai Feng,Lingqin Shen,Aili Wang,Tingshun Jiang,Zhanao Wu 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.12
Gas phase methylation of methyltrichlorosilane with methyl chloride to high-valued dimethyldichlorosilane was carried out by using metallic aluminum as a chlorine acceptor in the co-presence of activated carbon, tin, and zinc. The addition of activated carbon in metallic aluminum significantly enhanced the methylation of methyltrichlorosilane,and dimethyldichlorosilane was dominantly produced. Activated carbon played a catalyst role in the methylation reaction. When active metals, such as tin and zinc, were added in the mixture of aluminum and activated carbon,the active metals and activated carbon synergistically catalyzed the methylation of methyltrichlorosilane with methyl chloride toward the formation of dimethyldichlorosilane.
Yanhua Cui,Lili Yang,Yan Yan,Zengkai Wang,Jian Zheng,Binrong Li,Yonghai Feng,Chunxiang Li,Minjia Meng 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.2
The photocatalytic efficiency of conventional blending photocatalytic membranes suffers a significant reduction due to effective photocatalyst embedded in membrane matrix. Therefore, in this study, inspired by the bioadhesive technology of polydopamine (pDA), a novel Ti doped bismuth oxyiodide (BiOI)-polydopamine (pDA)-coated cellulose acetate (CA) (Ti/BiOI-pDA/CA) photocatalytic nanocomposite membranes were successfully developed for effective removal of tetracycline (TC). The Ti/BiOI-pDA/CA nanocomposite membranes displayed very high photocatalytic activity toward TC (about 98% after 120 min) under visible light irradiation and superior photodegradation kinetics (k=0.03214 min1). The removal rate of Ti/BiOI/-pDA/CA nanocomposite membranes under dynamic cyclic degradation system could be further improved, giving TC removal efficiency of 91% in 60min. Remarkably, the permeate flux, flux recovery ratio (FRR), reversible fouling (Rr), irreversible fouling (Rir) and the total fouling ratio (Rt) revealed the Ti/BiOI-pDA/CA nanocomposite membranes had excellent antifouling performance. In addition, the Ti/ BiOI-pDA/CA nanocomposite membranes exhibited excellent stability and reusability. Therefore, this work gives insight into the effective removal of TC wastewater and has a great potential for new generation of high-performance photocatalytic membranes for practical wastewater treatment in the future.