Promising activated carbons derived from cabbage leaves and their application in high-performance supercapacitors electrodes

In this paper, cabbage leaves (CLs) were used to synthesize porous activated carbon by the carbonization and activation processes. The material for CLs were carbonized at 600 °C and activated at 800 °C with the KOH/C-600 mass ratio 4 (denoted as AC-800) show typical amorphous character and display porous structures with high specific surface areas 3102 m²/g via XRD and BET measurements. As the electro-active material, AC-800 electrode exhibit ideal capacitive behaviors in aqueous electrolytes and the maximal specific capacitance is as high as 336 F/g at the current density of 1 A/g. Furthermore, AC-800 electrode shows excellent electrochemical cycle stability with ～95 % initial capacitance being retained after 2000 cycles. The desirable capacitive performances enable the CLs to act as a new biomass source of carbonaceous materials for high-performance supercapacitors and low-cost electrical energy storage devices.     

2-(3,5-二溴-2-吡啶偶氮)-5-二乙氨基苯酚作络合滴定指示剂连续测定铁和铝

对2-(3,5-二溴-2-吡啶偶氮)-5-二乙氨基苯酚作铁(Ⅲ),铜(Ⅱ)的配位滴定指示剂进行了研究.在pH1.8～2.0时用EDTA标准溶液滴定铁(Ⅲ).在滴定铁(Ⅲ)后的溶液中,加入对铝过量的EDTA标准溶液,在pH3.8～4.0煮沸下,铝(Ⅲ)与EDTA生成稳定的络合物,过量的EDTA用硫酸铜标准溶液滴定,从而测定铝(Ⅲ).     

二溴羟基苯基荧光酮荧光熄灭法测定铜

研究了在pH 6 2～ 8 2磷酸二氢钾 磷酸氢二钠缓冲体系中 ,非离子表面活性剂TritonX 10 0存在下 ,铜 (Ⅱ )与二溴羟基苯基荧光酮 (DBH PF)形成 1∶2红色三元混配合物而使荧光熄灭 ,建立了荧光熄灭法测定铜的新方法。配合物的λex=5 3 0nm ,λem=5 60nm ,含量在 0～ 80 μg·L-1范围内有良好的线性关系 ,检测限为 0 2 μg·L-1。体系的灵敏度高 ,选择性好。Al(Ⅲ )、Fe(Ⅲ )、Ti(Ⅳ )的干扰 ,可用氟化钠、苦杏仁酸掩蔽。方法快速简便 ,用于人发、茶叶及水中微量铜的测定与AAS相符 ,RSD(n=5 ) <6 9% ,回收率在 98%～ 10 4 %之间。     

基于GPU加速的几何纹理合成方法

提出了一种基于GPU加速的几何纹理合成方法,以解决几何纹理合成过程中高计算量、高存储占用和高耗时等问题.首先,对样本几何纹理数据进行子块划分,并根据子块在样本中的位置关系设计可重用样本顶点数据的数据结构,优化存储以降低内存的占用率;然后,采用GPU多线程并发技术设计并行加速算法,将串行的几何纹理合成过程并行化,从而实现快速生成任意尺寸的新的几何纹理.实验结果表明,该算法不仅占用存储较少,而且在保证合成质量的同时极大地降低了几何纹理的合成耗时.     

d-f跃迁发光稀土配合物研究进展

稀土配合物独特的发光性质使其在众多领域有很大的应用价值.其中,d-f跃迁发光稀土配合物具有跃迁宇称允许、激发态寿命短和光谱可调等特点,但相关研究还有待进一步深入.本文介绍了稀土配合物的发光机制,综述了具有d-f跃迁发光性质的稀土配合物(主要是Ce3+,Eu2+,Yb2+和Sm2+配合物)的研究进展,并初步总结了配合物分...     

铝－5＇－硝基水杨基荧光酮－溴化十六烷基吡啶显色反应的研究及应用

本文研究了铝－５＇－硝基水杨基荧光酮（５＇－ＮＳＦ）－溴化十六烷基吡啶（ＣＰＢ）体系的显色条件。试验结果表明，在ｐＨ４．５～６．０范围内，铝与５＇－ＮＳＦ及ＣＰＢ形成紫红色的三元配合物，其最大吸收波长为５５８ｎｍ，摩尔吸光系数为１．３×１０￣５，配合物的组成为Ａｌ：５＇－ＮＳＦ：ＣＰＢ＝１：２：２。铝浓度在０～４μｇ／２５ｍＬ范围内符合比耳定律。方法用于石灰石、石英沙、石膏中铝的测定，结果令人满意。     

表面活性剂流动相用于混合固定相薄层色谱

将表面活性剂流动相用于ＧＤＸ与硅胶Ｇ混合固定相薄层色谱,用表面活性剂、乙醇和水的混合流动相对一些水溶性食品染料及指示剂等进行了分离,得到满意的结果,可以部分代替非极性键合相薄板。     

Flexible and Hierarchical Metal–Organic Framework Composites for High‐Performance Catalysis

The development of porous composite materials is of great significance for their potentially improved performance over those of individual components and extensive applications in separation, energy storage, and heterogeneous catalysis. Now mesoporous metal–organic frameworks (MOFs) with macroporous melamine foam (MF) have been integrated using a one‐pot process, generating a series of MOF/MF composite materials with preserved crystallinity, hierarchical porosity, and increased stability over that of melamine foam. The MOF nanocrystals were threaded by the melamine foam networks, resembling a ball‐and‐stick model overall. The resulting MOF/MF composite materials were employed as an effective heterogeneous catalyst for the epoxidation of cholesteryl esters. Combining the advantages of interpenetrative mesoporous and macroporous structures, the MOF/melamine foam composite has higher dispersibility and more accessibility of catalytic sites, exhibiting excellent catalytic performance.     

Calixarene/pillararene-based supramolecular selective binding and molecular assembly

This review mainly summarized the recent researches on the supramolecular selective binding and molecular assembly based on calixarene and pillararene. Several representative examples were provided to expound the progress in the area of recognition and sensing, multi-functional assembly and crosslinked multi-dimensional materials.