用过氧酸对大豆磷脂进行羟基化改性,主要研究了双氧水用量对羟基化磷脂碘值和过氧化值的影响;考察了羟基化改性对磷脂加脂革在存放、干/湿热、光照等条件下性能变化的影响。结果表明,当双氧水的用量为40%时,羟基化磷脂的碘值降至14.51 g...用过氧酸对大豆磷脂进行羟基化改性,主要研究了双氧水用量对羟基化磷脂碘值和过氧化值的影响;考察了羟基化改性对磷脂加脂革在存放、干/湿热、光照等条件下性能变化的影响。结果表明,当双氧水的用量为40%时,羟基化磷脂的碘值降至14.51 g I_(2)/100 g。对磷脂进行羟基化改性有效解决其加脂皮革在存放、干/湿热和光照等条件下的异味、六价铬上升、柔软度下降和黄变等问题。但由于羟基化改性大豆磷脂中过氧化物的生成,需要进一步研究消除过氧化物的方法,以达到彻底解决磷脂加脂革中六价铬及异味的产生问题。展开更多
Surface modification with metal oxide nanoclusters has emerged as a candidate for the enhancement of the photocatalytic activity of titanium dioxide. An increase in visible light absorption and the suppression of char...Surface modification with metal oxide nanoclusters has emerged as a candidate for the enhancement of the photocatalytic activity of titanium dioxide. An increase in visible light absorption and the suppression of charge carrier recombination are necessary to improve the efficiency. We have studied Mg4O4 and Sn4O4 nanoclusters modifying the（101） surface of anatase TiO2 using density functional theory corrected for on-site Coulomb interactions（DFT ＋ U）. Such studies typically focus on the pristine surface, free of the point defects and surface hydroxyls present in real surfaces. We have also examined the impact of partial hydroxylation of the anatase surface on a variety of outcomes such as nanocluster adsorption, light absorption, charge separation and reducibility. Our results indicate that the modifiers adsorb strongly at the surface, irrespective of the presence of hydroxyl groups, and that modification extends light absorption into the visible range while enhancing UV activity. Our model for the excited state of the heterostructures demonstrates that photoexcited electrons and holes are separated onto the TiO2 surface and metal oxide nanocluster respectively. Comparisons with bare TiO2 and other TiO2-based photocatalyst materials are presented throughout.展开更多
文摘用过氧酸对大豆磷脂进行羟基化改性,主要研究了双氧水用量对羟基化磷脂碘值和过氧化值的影响;考察了羟基化改性对磷脂加脂革在存放、干/湿热、光照等条件下性能变化的影响。结果表明,当双氧水的用量为40%时,羟基化磷脂的碘值降至14.51 g I_(2)/100 g。对磷脂进行羟基化改性有效解决其加脂皮革在存放、干/湿热和光照等条件下的异味、六价铬上升、柔软度下降和黄变等问题。但由于羟基化改性大豆磷脂中过氧化物的生成,需要进一步研究消除过氧化物的方法,以达到彻底解决磷脂加脂革中六价铬及异味的产生问题。
基金support from Science Foundation Ireland through the US-Ireland R&D Partnership Program (No. SFI 14/US/ E2915)the European Commission through COST Action CM1104 "Reducible Metal Oxides, Structure and Function"+1 种基金funded by SFIby the SFI and Higher Education Authority funded Irish Centre for High End Computing
文摘Surface modification with metal oxide nanoclusters has emerged as a candidate for the enhancement of the photocatalytic activity of titanium dioxide. An increase in visible light absorption and the suppression of charge carrier recombination are necessary to improve the efficiency. We have studied Mg4O4 and Sn4O4 nanoclusters modifying the（101） surface of anatase TiO2 using density functional theory corrected for on-site Coulomb interactions（DFT ＋ U）. Such studies typically focus on the pristine surface, free of the point defects and surface hydroxyls present in real surfaces. We have also examined the impact of partial hydroxylation of the anatase surface on a variety of outcomes such as nanocluster adsorption, light absorption, charge separation and reducibility. Our results indicate that the modifiers adsorb strongly at the surface, irrespective of the presence of hydroxyl groups, and that modification extends light absorption into the visible range while enhancing UV activity. Our model for the excited state of the heterostructures demonstrates that photoexcited electrons and holes are separated onto the TiO2 surface and metal oxide nanocluster respectively. Comparisons with bare TiO2 and other TiO2-based photocatalyst materials are presented throughout.
