Adsorption of organic phosphorus in pesticide wastewater by CaAI hydrotalcite

采用共沉淀法制备了CaAl水滑石（CaAl-LDH），并运用扫描电子显微镜（SEM）和热重／差示扫描量热分析（TG—DSC）技术对CaAl-LDH的形貌及热稳定性进行了表征。采用CaAl-LDH对含膦农药废水进行除膦吸附试验，探讨了搅拌时间、pH值、CaAl-LDH的加入量对吸附性能的影响。结果表明：当CaAl-LDH的加入量为80g／L，搅拌时间为3h，pH值为6—8时，CaAl-LDH对膦的吸附性最强，废水中膦质量分数仅为0．1×10^-6。CaAl hydrotalcite （CaAl-LDH） was prepared by coprecipitation method. The morphology and thermal stability of CaAl-LDH was characterized by scanning electron microscopy （SEM） and thermogravimetry/differential scanning calorimetry （TG - DSC ）. The test of phosphine adsorption removal by CaAl-LDH from phosphine pesticide wastewater was carried out. The results showed that when the addition amount of CaAl-LDH was 80 g/L, the stirring time was 3 h, and the pH value was from 6 to 8, CaAl-LDH had the strongest adsorption to phosphine, and the mass fraction of phosphine in wastewater was only 0.1× 10^-6

Electrochemical Behavior of Redox Proteins on ZnO Nanorod-Modified Electrodes Prepared by Electrodeposition

Corresponding authors. ZHOU Jian-Zhang, Email: [email protected]; Tel: +86-592-2189663.[中文文摘]采用恒电位阴极还原法在金电极表面一步修饰ZnO纳米棒,制备成ZnO纳米棒修饰电极.扫描电子显微镜(SEM)和X射线衍射(XRD)结果显示制得的ZnO为直径约100nm的六棱柱状纤锌矿晶体纳米棒.使用ZnO纳米棒修饰的金电极研究细胞色素c的直接电化学行为,结果表明:ZnO纳米棒修饰的金电极能有效探测到细胞色素c的铁卟啉辅基在不同价态下的电化学行为;细胞色素c吸附后,ZnO纳米棒修饰的金电极对过氧化氢的电流响应呈现良好的线性关系.[英文文摘]We successfully prepared ZnO nanorod-modified Au (ZnO nanorod/Au) electrodes using one-step cathodic electrodeposition. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and crystal phase of the ZnO nanorods. The data showed that the ZnO nanorods were wurtzite type crystals with a hexagonal rod shape and a diameter of about 100 nm and that the ZnO nanorods were arranged well on the surface of electrodes. These ZnO nanorod-modified electrodes were able to detect direct electron transfer from cytochrome c (cyt c). Cyclic voltammograms showed that the direct electron transfer of cyt c with heme iron in different valence states was easily achieved by the ZnO nanorod/Au electrode. Data of amperometric responses demonstrated that a linear amperometric response to hydrogen peroxide was observed on the ZnO nanorod/Au electrodes after adsorbing cyt c.国家自然科学基金(20603027,21021002,20973134); 国家高技术研究发展专项经费项目(2009AA03Z327)资

一种新型二元判定图器件和电路

提出了一种基于二元判定图(BDD)原理的新型逻辑器件和电路.BDD器件以电流模式的开关电流存储器为基本单元,具有符合二元判定图的两向通路的特点.用这种器件按照BDD树形图可以构成任意形式的组合逻辑电路.给出了或门、异或门及四位加法器电路的例子,并使用HSPICE仿真器进行了仿真,验证了这种器件及其电路的正确性

Mobile rainwater collection on slope and drip irrigation system

雨水利用是干旱半干旱地区农业发展的生长点 ,该文依据干旱半干旱地区自然降水特征、农耕地分布特点、农业种植制度、作物需水与土壤水分动态变化规律 ,提出了“上坡春季种粮 ,秋季覆膜集雨 ,地边打窖贮水 ,补灌下部作物”的坡地活动式集雨及灌溉系统 ,并对其集雨效率、农田水分效应和系统产出效益进行了试验研究。研究结果表明 ,该系统具有集水效率高、保水效果好和增产效益明显的优点 ,是一种适合于干旱半干旱地区的集雨灌溉农业模式

高导热低填量聚合物基复合材料研究进展

高导热低填量聚合物基复合材料在电子封装和大功率电子设备等领域有着巨大需求。通常高导热聚合物是通过在高分子基体中均匀分散高含量的导热填料来实现的,然而较高填料含量会极大地恶化复合材料力学性能和提升材料经济成本,因此高填量复合材料很难满足当前工业应用上的需求。综述了近年来高导热低填量聚合物基复合材料制备研究进展,简要介绍了导热机制和影响低填量聚合物基复合材料导热性能的主要因素,按照不同填料类型介绍了一些热导率高于1.0 W/(m·K)且填充量低于10vol%的高导热低填量聚合物基复合材料的制备方法和研究进展,展望了高导热低填量聚合物基复合材料的发展方向