It is well known that the photocatalytic activity of TiO_2 thin filmsstrongly depends on the preparing methods and post-treatment conditions, since they have a decisiveinfluence on the chemical and physical properties...It is well known that the photocatalytic activity of TiO_2 thin filmsstrongly depends on the preparing methods and post-treatment conditions, since they have a decisiveinfluence on the chemical and physical properties of TiO_2 thin films. Therefore, it is necessary toelucidate the influence of the preparation process and post-treatment conditions on thephoto-catalytic activity and surface microstructures of the films. This review deals with thepreparation of TiO_2 thin film photo-catalysts by wet-chemical methods (such as sol-gel,-reversemicellar and liquid phase deposition) and the comparison of various preparation methods as well astheir advantage and disadvantage. Furthermore, it is discussed that the advancement ofphotocatalytic activity, super-hydrophilicity and bactericidal activity of TiO_2 thin filmphotocatalyst in recent years.展开更多
基于胶束增强荧光法测定高温煤焦油中酚类含量。取100 m L的煤焦油样品,将样品放入带有温度计的蒸馏烧瓶中,随后再将样品转放到蒸馏仪器转子中经过对蒸馏烧瓶的加热,再用调节弹簧对连接仪器的连接部分进行加紧,防止气体泄漏,随后再将煤...基于胶束增强荧光法测定高温煤焦油中酚类含量。取100 m L的煤焦油样品,将样品放入带有温度计的蒸馏烧瓶中,随后再将样品转放到蒸馏仪器转子中经过对蒸馏烧瓶的加热,再用调节弹簧对连接仪器的连接部分进行加紧,防止气体泄漏,随后再将煤焦油进行温度段位划分启动真空装置,观察蒸馏装置中的空余体积,防止样品在蒸馏装置中产生爆沸现象或者起泡现象,经过煤焦油的蒸馏实验可以得到煤焦油中的杂质较多的酚类化合物,测定高温煤焦油中酚类含量。结果表明胶束荧光灯对不同温度阶段的煤焦油酚类测定在实验初始状态下酚类含量呈不同斜率的线性增长,当温度段达到高温状态时,酚类含量的测定曲线逐渐归于平稳状态。基于胶束增强荧光法的高温煤焦油中酚类含量测定方法具备有效性。展开更多
文摘It is well known that the photocatalytic activity of TiO_2 thin filmsstrongly depends on the preparing methods and post-treatment conditions, since they have a decisiveinfluence on the chemical and physical properties of TiO_2 thin films. Therefore, it is necessary toelucidate the influence of the preparation process and post-treatment conditions on thephoto-catalytic activity and surface microstructures of the films. This review deals with thepreparation of TiO_2 thin film photo-catalysts by wet-chemical methods (such as sol-gel,-reversemicellar and liquid phase deposition) and the comparison of various preparation methods as well astheir advantage and disadvantage. Furthermore, it is discussed that the advancement ofphotocatalytic activity, super-hydrophilicity and bactericidal activity of TiO_2 thin filmphotocatalyst in recent years.
文摘为减小酶与表面活性剂之间的静电作用,提高酶的活性,在丁二酸二异辛酯磺酸钠(AOT)/异辛烷反胶束体系中加入了正辛醇,并用微量量热法研究了AOT/正辛醇/异辛烷反胶束体系中正辛醇浓度(c),含水量(wo),pH及温度(T)对纤维素酶降解纤维素的影响.结果表明,正辛醇的加入确实有利于纤维素酶活性的提高,而在上述反胶束体系中纤维素酶降解纤维素的最佳条件是c=0.11mol.L-1,wo=3.1,pH=5.01,T=315.57 K.
文摘基于胶束增强荧光法测定高温煤焦油中酚类含量。取100 m L的煤焦油样品,将样品放入带有温度计的蒸馏烧瓶中,随后再将样品转放到蒸馏仪器转子中经过对蒸馏烧瓶的加热,再用调节弹簧对连接仪器的连接部分进行加紧,防止气体泄漏,随后再将煤焦油进行温度段位划分启动真空装置,观察蒸馏装置中的空余体积,防止样品在蒸馏装置中产生爆沸现象或者起泡现象,经过煤焦油的蒸馏实验可以得到煤焦油中的杂质较多的酚类化合物,测定高温煤焦油中酚类含量。结果表明胶束荧光灯对不同温度阶段的煤焦油酚类测定在实验初始状态下酚类含量呈不同斜率的线性增长,当温度段达到高温状态时,酚类含量的测定曲线逐渐归于平稳状态。基于胶束增强荧光法的高温煤焦油中酚类含量测定方法具备有效性。