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以纳米二氧化钛(TiO2)光催化降解甲醛, 使用2-甲基-2-亚硝基丙烷(2-methyl-2-nitroso-propane, MNP)作为自旋捕截剂(spin trap, ST), 研究了反应过程中的自由基中间体, 得到了一种新的自旋加合物(spin adduct, ST-R). 电子顺磁共振(Electron Paramagnetic Resonance, EPR)的结果表明, 甲醛在水溶液中降解的反应中间体为8226;CH(OH)2, 并提出了一种新的降解机理. 相似文献
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The silver seed on silicon was prepared through aqueous I-IF and AgNO3 solution at room temperature. In order to explore the formation process of silver seed on silicon, the methods of open circuit potential with time (OCP-t), anodic stripping sweep voltammetry (ASV) and scanning tunneling microscope (STM) were used in this work. The procedure of silver nucleus growing into large particles was explained by electro-negativity. The growth mechanism of silver seed on silicon has been presented: at first, the silver monolayer and multilayer firstly grows onto silicon without fully covering the surface at the expense of silicon etching due to the silver seed attracting the electron from silicon, after that, the monolayer coalesces together, forming continuous grain film with some silver atoms diffusing into the silicon and the multilayer still grows thick simultaneously. 相似文献
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以水合肼为还原剂,在2.25 mol/L NH3-0.56 mol/L HAe(pH 10~10.5)的基本镀浴中,用化学镀方法将镀浴中的微量Ag 离子选择性地沉积于玻碳旋转圆盘电极表面,从而将Ag 与其它共存金属离子分离.用开路电位-时问谱技术(OCP-t)、循环伏安法(CV)和微分脉冲伏安法(DPASV)表征了该化学镀分离银的机理和效果.证明在多种金属离子和常见阴离子共存的复杂溶液体系中,可将银进行有效分离;电极表面化学镀富集银量的OCP-t曲线与镀浴中还原剂NH2NH2的浓度在0.1~1.5mol/L范围内有线性关系;而CV法溶出峰电量与镀浴中Ag 浓度在1~10 mmoL/L范围内呈线性关系.电极表面富集的银溶出峰电流与Ag 浓度在6~20μmol/范围内有很好的线性关系.该方法已应用于粗铅样中银的还原、分离和测定,分析结果与电感耦合等离子体发射光谱法(ICP/AES)基本一致. 相似文献
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合成了一种卟啉类小分子荧光探针5,10,15,20-四对羟苯基卟啉(THPP)并对其结构进行表征.通过荧光光谱法,可以分别定性、定量检测铜离子(Cu2+)、焦磷酸根(PPi)及碱性磷酸酶(ALP).研究结果可以转化为一个代表性综合实验,激发学生对科学研究的极大兴趣,培养学生利用综合知识的能力.实验囊括了有机化学、分析化学、生物化学及无机化学等多个学科的多个知识点及多种重要的仪器操作技术,有助于学生综合实验能力的提升. 相似文献
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