水热法合成含锌羟基磷灰石

自然骨中的无机组分并不是纯的羟基磷灰石[（Ca10（PO4）6（OH）2,Hydroxyapatite,简称HA],还含有微量镁离子（Mg2＋）、锌离子（Zn2＋）等。为满足临床的需要,常常需要在HA中添加锌元素制成含锌羟基磷灰石（Zn-HA）,其有望成为新一代的骨修复和替换材料。以硝酸钙、磷酸三铵、硝酸锌为原料,在210℃下水热处理8h合成Zn-HA和Ca19Zn2（PO4）14混合粉末。采用X射线衍射（XRD）、电子扫描电镜（SEM）和热重—差热分析（TG-DTA）法对合成粉体的晶相、形貌和热稳定性进行分析。结果表明：在210℃、8h的实验条件下,反应釜的填充度较大时容易合成Zn-HA,但Zn掺量的摩尔分数不宜超过4%;随着Zn掺量和反应釜填充度的增加,HA的结晶度下降;Zn的掺入促使HA易分解,使其热稳定性较差。     

水合磷酸钴铵晶体材料的低热固相法合成及表征

以CoCl2.6H2O和(NH4)3PO4.3H2O为原料,在适量表面活性剂聚乙二醇(PEG-400)的存在下,在室温(R.T.)研磨反应混合物进行固相反应,将反应混合物在不同的温度(80℃,60℃,R.T.)保温陈化4 h,用水洗去混合物中可溶性的无机盐,在110℃下烘干2 h,得到一水合磷酸钴铵晶体材料。用XRD,IR,SEM及TG/DTA对产物进行了表征。结果表明,3种不同保温温度均得到具有正交晶系物相,空间群为Pmn21(31)的片状(NH4)3CoPO4.H2O晶体材料。     

磷酸钙沉淀法去除厌氧养猪废水中磷的实验研究

利用钙盐对模拟的厌氧养猪废水进行除磷研究,找出磷酸钙形成沉淀所需的适宜钙磷比。先后进行批次和连续流试验,比较生石灰与熟石灰的除磷效果以及石灰与钙盐在除磷应用上的区别,优化选出最佳除磷试剂。实验表明:磷酸钙沉淀法能有效去除厌氧养猪废水中的磷元素,同时降低废水的色度和浊度。     

表面磷化处理对固体润滑涂层性能的影响

磷化处理对粘结固润滑涂层的摩擦性能有很大影响。把氧化锌、磷酸、水按照不同比例配成磷化液,对金属表面进行不同参数(温度、时间)的磷化处理,并在其表面煮涂MoS2利用M-2摩擦磨损实验机测定不同磷化工艺下的MoS2涂层的磨擦学性能,确定了使MoS2固体润滑涂层摩擦性能达到最佳的磷化工艺参数,并讨论了磷化膜表面粗糙度对固体润滑涂层摩擦学性能的影响。     

薄层层析法分离重稀土元素

本文研究的薄层层析法分离重稀土元素的固定相为硅胶H/硝酸铵/CMC/H_2O(W/W33:4:1:110),展开剂为:1.二-2-乙基己基磷酸-异丙醚-乙醚-硝酸,2.单-2-乙基已基磷酸-异丙醚-乙醚-硝酸。本文测定了各重稀土元素的R_f值,研究了改变展开剂中各组分比例对各稀土元素色谱行为及分离效果的影响。当二-2-乙基已基磷酸-异丙醚-乙醚-硝酸体积比为1:10:6:1.1,单2-乙基己基磷酸-异丙醚-乙醚-硝酸体积比为1:8:8:1.1时,各相邻重稀土元素间均能表现出较明显的R_f值差异。分离上述稀土标准混合液,各元素的分离情况可达到定量测定要求,结果令人满意。     

Ultrasound effects on zinc recovery from EAF dust by sulfuric acid leaching

In this work, an ultrasound-assisted leaching process was studied for the recovery of zinc from electric arc furnace (EAF) dust, in which zinc was mainly present in the form of franklinite (60%). Hydrometallurgy is emerging as a preferred process for the recovery of a variety of metals, and the use of ultrasound could offer advantages over the conventional leaching process, especially for the dissolution of franklinite. Franklinite is a refractory phase that is difficult to leach and represents the main obstacle in conventional hydrometallurgy processing. Atmospheric leaching with different sulfuric acid concentrations (0.2-2.0 M) at two temperatures (323 and 353 K) was performed. The tests were conducted using both conventional and ultrasound-assisted leaching. After the leaching tests, the solid residues were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques, whereas the leach liquor was analyzed by inductively coupled plasma spectroscopy (ICP). The use of ultrasound facilitated the dissolution of franklinite at low acid concentrations and resulted in a greater zinc recovery under all of the investigated operating conditions.     

Synthesis and crystal structure of tetranuclear zinc benzoate

A tetranuclear zinc benzoate Zr4O(C6H5CO2)6 was synthesized and characterized by X-ray single crystal determination. It crystallizes in cubic, space group Ia-3d. Its crystal cell is very large, α=4.10063(18)nm, V=68.953(5)nm^3 and Z=48. The structure is composed of discrete Zr4O(C6H5CO2)6 molecules. In each molecule, four zinc atoms are held together by a central oxygen atom, which results in the formation of a regular tetrahedron. All benzoate ligands coordinate to zinc atoms in a bidentate bridging mode. Each zinc atom is in a slightly distorted tetrahedral geometry, coordinated by three benzoate oxygen atoms and the central oxygen atom. The intermolecular interactions result in the formation of a three-dimensional supramolecular framework, with non-intersecting parallel channels.     

人类新基因ZNF322的研究进展

根据计算机克隆的ZNF322基因序列设计引物,从人类胚胎心脏文库中克隆了ZNF322基因.该基因位于染色体6p22.1,编码由402个氨基酸残基组成、含有9个连续排列的C2H2型锌指蛋白质.Northern杂交的结果表明该基因在成人所有被检测组织中表达。亚细胞定位研究证明ZNF322蛋白分布在胞核和胞质中.报告基因分析显示ZNF322是一种潜在的转录激活因子.     

配合物Zn（phen）2[（C6H5）2C（OH）COO]2的水热合成及晶体结构

在甲醇和水的混合溶剂中用二苯乙醇酸、邻菲罗啉（phen）、高氯酸锌合成了一种新型配位聚合物Zn（phen）2[（C6H5）2C（OH）COO]2。该配合物晶体属三斜晶系,空间群C2／c,晶胞参数：a=2．5912（4）,b=1．13381（17）,c=1．7457（3）nm;β=1123．697（2）°,V=4．2671（11）nm°,Dc=1．370g／cm^3,Z=4,F（000）=1824。最终GooF=1．005,最终偏离因子R1=0．0367,wR2=0．0834。晶体中锌原子与2个邻菲罗啉的4个N原子及2个二苯乙酸根4个羧基氧原子中的两个氧原子配位,形成六配位的变形八面体结构。     

二苯基碳酰二肼光度法测定镀锌层中铬

研究了二苯基碳酰二肼与微量铬的显色反应，在硫酸介质中铬与二苯基碳酰二肼反应生成可溶性的紫红色络合物，在波长为550nm处测其吸光度。当铬含量在0-25μg／50mL范围内符合比尔定律，此法应用于铁片镀锌层中微量铬的测定获得满意结果。