A Photoactivated Cu–CeO2 Catalyst with Cu-[O]-Ce Active Species Designed through MOF Crystal Engineering

Fully utilizing solar energy for catalysis requires the integration of conversion mechanisms and therefore delicate design of catalyst structures and active species. Herein, a MOF crystal engineering method was developed to controllably synthesize a copper–ceria catalyst with well-dispersed photoactive Cu-[O]-Ce species. Using the preferential oxidation of CO as a model reaction, the catalyst showed remarkably efficient and stable photoactivated catalysis, which found practical application in feed gas treatment for fuel cell gas supply. The coexistence of photochemistry and thermochemistry effects contributes to the high efficiency. Our results demonstrate a catalyst design approach with atomic or molecular precision and a combinatorial photoactivation strategy for solar energy conversion.     

Highly Active Hydrogen-rich Photothermal Reverse Water Gas Shift Reaction on Ni/LaInO3 Perovskite Catalysts with Near-unity Selectivity

Photo-assisted reverse water gas shift (RWGS) reaction is regarded green and promising in controlling the reaction gas ratio in Fischer Tropsch synthesis. But it is inclined to produce more byproducts in high H₂ concentration condition. Herein, LaInO₃ loaded with Ni-nanoparticles (Ni NPs) was designed to obtain an efficient photothermal RWGS reaction rate, where LaInO₃ was enriched with oxygen vacancies to roundly adsorbing CO₂ and the strong interaction with Ni NPs endowed the catalysts with powerful H₂ activity. The optimized catalyst performed a large CO yield rate (1314 mmol g_Ni⁻¹ h⁻¹) and ≈100 % selectivity. In situ characterizations demonstrated a COOH* pathway of the reaction and photoinduced charge transfer process for reducing the RWGS reaction active energy. Our work provides valuable insights on the construction of catalysts concerning products selectivity and photoelectronic activating mechanism on CO₂ hydrogenation.     

抗癌药物6-巯基嘌呤与DNA相互作用的电化学研究

用循环伏安法、示差脉冲伏安法和紫外光谱法研究了抗癌药物6-巯基嘌呤与DNA的相互作用。在pH 5.6的乙酸缓冲溶液中,两者以静电形式结合形成1:1的缔合物,其缔合物为非电活性化合物,结合常数是5.17×10~6。同时对DNA与6-MP电极过程机理进行了研究,并求得了电极过程动力学参数。     

基于酚藏花红掺杂有机改性溶胶-凝胶膜的亚硝酸盐光学传感器

利用溶胶-凝胶法,研制出基于有机改性溶胶-凝胶膜的亚硝酸盐光学传感器.以甲基三乙氧基硅烷为有机交联剂,与正硅酸乙酯进行水解和缩聚,制备了酚藏花红包埋的有机-无机硅酸盐杂化材料,并采用旋涂法将其涂抹在显微镜载玻片上,形成薄膜.在酸性条件下,NO<'-><,2>与酚藏花红掺杂的溶胶-凝胶膜发生作用,使溶胶-凝胶膜从红色变为...     

铋掺杂介孔二氧化钛的制备及光催化动力学

以介孔分子筛(KIT-6)为载体,采用溶液浸渍法合成了铋(Bi)掺杂的介孔二氧化钛(TiO₂)光催化剂。利用XRD、TEM、SEM、XPS、N₂吸附-脱附法和拉曼光谱法等技术手段对材料的结构和形貌进行表征。通过紫外-可见吸收光谱法考察了催化剂对罗丹明B光催化降解效率,进一步考察了Bi的掺杂量对光催化反应速率的影响,并对光催化降解动力学进行了初步研究。结果表明,Bi掺杂的介孔TiO₂具有较窄的孔径分布(3~4 nm),而且吸收范围扩展到可见光区,其光催化活性明显高于商品TiO₂(P25)。随之Bi掺杂量的提高,反应速率常数也增大,其光催化降解罗丹明B的反应均符合准一级动力学方程。     

东天山造山带晚古生代构造演化与多金属矿产成矿规律

东天山造山带在晚古生代时期经历了四阶段演化过程,即泥盆纪吐-哈古大洋形成,早石炭世俯冲造山,晚石炭世碰撞造山,以及二叠纪造山期后造山带的进一步变形.自北而南划分为大南湖-哈尔里克岛弧带、康-阿板块碰撞缝合带和中天山岛弧带等三个一级构造单元(带).东天山的矿产严格受构造控制,在晚古生代构造演化期间发育的铜、金、铜镍硫化物等多金属矿床的成矿具有十分明显的时-空演化规律.发育有斑岩型铜矿床、铜(镍)硫化物矿床、矽卡岩型铜多金属矿床、韧性剪切带型金矿床和热液型金矿床等矿床类型.这些矿床在东天山地区构成四条大的成矿带:康古尔断裂以北铜矿带;金、铜镍硫化物矿床成矿带(北带);阿齐山-雅满苏铁(铜)、银多金属成矿带(南带)和中天山地块铁、铅锌、银成矿带.     

A Photoactivated Cu–CeO2 Catalyst with Cu‐[O]‐Ce Active Species Designed through MOF Crystal Engineering

Fully utilizing solar energy for catalysis requires the integration of conversion mechanisms and therefore delicate design of catalyst structures and active species. Herein, a MOF crystal engineering method was developed to controllably synthesize a copper–ceria catalyst with well‐dispersed photoactive Cu‐[O]‐Ce species. Using the preferential oxidation of CO as a model reaction, the catalyst showed remarkably efficient and stable photoactivated catalysis, which found practical application in feed gas treatment for fuel cell gas supply. The coexistence of photochemistry and thermochemistry effects contributes to the high efficiency. Our results demonstrate a catalyst design approach with atomic or molecular precision and a combinatorial photoactivation strategy for solar energy conversion.     

新疆和田透闪石软玉的振动光谱

采用X荧光光谱、X光粉晶衍射、红外光谱和拉曼光谱等对新疆和田地区的白色、青色和黑色透闪石软玉进行了化学成份和振动光谱研究。在通过X光粉晶衍射判定所采样品全部属于透闪石质软玉后,采用红外光谱仪和拉曼光谱仪对样品进行振动光谱测试,并结合化学成分测试结果分析白玉、青玉和墨玉等不同颜色的软玉中透闪石晶体结构M1、M3位置中阳离子占位情况。红外光谱中M—OH吸收谱带显示样品在M1及M3位置不仅有Mg2+和Fe2+,还有Fe3+。M—OH的吸收谱带和振动光谱特征与化学成分测试结果一致。在此基础之上,总结了新疆和田透闪石软玉中阳离子的种类和含量对振动光谱的影响。     

毛细管电泳电化学发光法测定盐酸帕罗西汀的研究

实验发现盐酸帕罗西汀能增强钌联吡啶的电化学发光信号,据此建立了一种盐酸帕罗西汀的毛细管电泳-电化学发光测定新方法。在实验中,分别对毛细管电泳分离条件和电化学发光检测条件进行了优化。在优化的实验条件下,盐酸帕罗西汀检出限为3.45&#215;10^-8g/mL（S/N=3）,线性范围为3.0&#215;10^-7-1.0&#215;10^-4g/mL。通过对1.0&#215;10^-5g/mL的盐酸帕罗西汀进行11次平行测定,峰高的RSD为2.5%。已用于盐酸帕罗西汀片剂的测定。