喷钛对甜叶菊糖苷含量和积累量的影响

为探索喷钛对甜叶菊叶片中糖苷、甜菊苷(St)和莱鲍迪苷A(RA)的含量、积累量及其比例的影响,为中药材的施肥提供科学依据,应用盆钵培养方法,在甜叶菊生长前期和中期进行叶面喷钛。结果表明:菊隆5号的最佳喷施区间12.22~19.36 mg·kg-1,在喷钛浓度为19.36 mg·kg-1时含量达到最高;新品种2号的最佳喷施区间为12.10~16.71 mg·kg-1,在喷钛浓度为16.71 mg·kg-1时含量达到最高;喷钛后新品种2号St所占比例的最高增幅为156.71%,菊隆5号St的最高增幅为42.28%。喷钛可明显提高糖苷含量和积累总量,与对照相比,差异显著;经回归发现糖苷含量或积累量与喷钛浓度间存在二次曲线关系,相关极显著;喷钛可以增加2个品种糖苷中St的比例。     

Phase Transformation Diffusion Bonding of Titanium Alloy to Stainless Steel

Jointing of titanium alloy and stainless steel is very often in the fields like aviation, chemical plants etc. The combination of materials has the advantages of both titanium alloy and stainless steel and will reduce the consumption of titanium resource. The phase transformation diffusion bonding of TA17 titanium alloy to 0CriSNigTi stainless steel are carried out on Gleeble - 1500D. The effcet of maximum thermal cycle temperature, the tensile strength, the fracture surface and microstruture of the joints are investigated. The results show that TiFe and TiFe2 intermetallics and some solid solutions are formed along the interface, when maximum thermal cycle temperature increase, the area proportion of intermetallics in the fracture surface increase, which are detrimental to the mechanical properties of the transition joints.     

Effects of different preparation methods onphotocatalytic activity of Fe3+/TiO2

Two kinds of Fe3+/TiO2 catalysts are prepared by Sol-gel method and hydrolysis method. XRD, UV-Vis, BET, curves of N 2 adsorption-desorption and 3D fluorescence are used to analyze the structures and properties of the catalysts, and their photocatalytic activities are investigated through degradation of DBP. The results show that two kinds of catalysts are anatase TiO 2. The band gap of the Fe3+/TiO 2 catalysts prepared by Sol-gel and hydrolysis method are 2.6 eV and 3.2 eV respectively, and the former with an absorption edge at 477 nm, while the latter with no redshift. The curves of N 2 adsorption-desorption of the Fe3+/TiO 2 catalysts prepared by Sol-gel and hydrolysis method are type Ⅳ and Ⅴ, their BET specific surface areas are 57.03 m2/g and 10.94 m2/g, and the hysteresis loop of the latter shifts to the high relative pressure region with a smaller pore volume and a bigger average pore diameter. Two kinds of catalysts can reduce photoluminescence properties of TiO 2 at various degrees, and the catalyst prepared by Sol-gel method shows a weaker photoluminescence property. The results of degradation experiment show the degradation rate of DBP by catalyst prepared by Sol-gel method and hydrolysis method are 60.53% and 31.83% respectively after 2 h.     

光催化氧化法降解微囊藻毒素研究进展

近年来蓝藻水华现象日益严重,甚至威胁了人类饮用水的安全。传统水处理技术对微囊藻毒素去除效果不明显,新型降解技术亟待研究。概述了光Fenton氧化法、二氧化钛系列光催化氧化法的特点和类型,研究其应用进展,并提出未来光催化氧化法降解微囊藻毒素的主要研究方向。     

硬脂酸/TiO_2/CNF超疏水复合材料的制备与表征

研究了一种利用硬脂酸对纳米二氧化钛(Nano-TiO_2)和纤维素纳米纤维(CNF)复合物进行有机表面修饰的新方法,主要包括纳米二氧化钛、纤维素纳米纤维的制备和利用硬脂酸对Nano-TiO_2/CNF复合体系进行有机表面修饰制得超疏水材料三个工艺过程。通过傅里叶变换红外光谱仪(FTIR)和场发射扫描电子镜(SEM)等对所得的样品进行表征,得出硬脂酸中的—COOH基团与TiO_2/CNF复合体系表面的—OH基团发生脱水反应,并将疏水性—CH_3基团引入复合体系中,复合体系表面构建的纳米级粗糙结构协同体系内引入的疏水基团使最终产物具有超疏水性。     

日粮添加钛对山羊瘤胃消化代谢的影响

试验分２个系列研究了日粮中添加铁对山羊瘤胃消化代谢及日增重的影响。系列Ⅰ体内试验结果表明，日粮添加钛不影响瘤胃液ｐＨ值；试验期与对照期相比，瘤胃液氨氮浓度明显升高（Ｐ＜０．０５）；瘤胃液三氯醋酸沉淀蛋白、细菌蛋白及原虫蛋白的含量均显著提高（Ｐ＜０；０５）；添加钦后瘤胃液总挥发性脂肪酸增加，乙酸、丁酸降低，但差异均不显著（Ｐ＞０．０５），而丙酸显著增加（Ｐ＜０．０５），乙酸／丙酸值从对照期的３．１５降至试验期的２．３３（Ｐ＜０．０５），说明添加钛使瘤胃发酵类型趋于丙酸型。添加钛使血清尿素氮明显降低（Ｐ＜０．０５），但对血清总蛋白含量、血糖水平无明显影响（Ｐ＞０．０５）。添加钛能显著提高山羊日增重（Ｐ＜０．０５）。系列Ⅱ体外培养试验结果表明添加钛后人工瘤胃中细菌蛋白、原虫蛋白、氨氮浓度以及挥发性脂肪酸含量等项指标与系列Ⅰ体内试验结果基本一致。     

DETERMINATION OF METALLIC IRON IN HIGH TITANIUM SLAG BY HEADSPACE GAS CHROMATNGRALHY

The following details are discussed in the present paper, after high titanium slag and H3PO4 is put in the closed system,the .reaction takes place under controlled temperature conditions, and the gas produced is collected. The two phases of gas liquid attain kinetic equilibrium, ihe gas above the liquid is used to make GC analysis with the aid of chromatographic column of 5A molecular sieve, TCD and N2 30ml/min. Satisfactory quantitative results can be achieved with simple instruments and uncomplicated operation technique.     

纳米二氧化钛光催化降解毒死蜱的动力学研究

以高压汞灯为光源,研究纳米二氧化钛(TiO2)降解毒死蜱的反应动力学,考察纳米TiO2用量、毒死蜱起始质量浓度及溶液pH值对毒死蜱光催化降解速率的影响.结果表明,纳米TiO2最佳用量为50～100 mg/L,毒死蜱初始质量浓度在5～80 mg/L时,其降解反应符合一级反应动力学规律,表现为毒死蜱质量浓度越大,降解速率常...     

空气净化网上光催化剂和活性炭相互增强净化能力的作用机理

采用浸涂法在活性炭空气净化网上负载纳米二氧化钛，在紫外光的照射下，净化网对一氧化碳、甲醛、硫化氢等污染物的净化能力明显增强，对比实验表明，在紫外光照射下光催化剂使被吸附的污染物发生降解反应而提高活性炭的净化能力。活性 吸附作用为光催化反应浓度环境，加速反应速率。     

Titanium dioxide photoinduced degradation of some pesticide/fungicide precursors

Five-membered nitrogen heterocycles (pyrrole, imidazole and 1,2,4-triazole) have been degraded using titanium dioxide and simulated solar radiation at pH = 8. The degradations followed a simple Langmuir-Hinshelwood mechanism. Accordingly, the adsorption equilibrium constants K of the heterocycles on the titanium dioxide surface and the rate constants k of degradation of the heterocycle-catalyst adduct have been obtained experimentally. While the K values decrease with heterocycle pKa, the k values increase with increasing pKa. Therefore, apparently, the rate constant depends on the availability of the electron pair on nitrogen, but at the same time the electron pair repulsion induced by the negatively charged titanium dioxide surface at pH = 8 causes a reverse effect in the adsorption equilibrium constant. Only in the case of imidazole, where the adsorption equilibrium constant is low enough (K = 0.013 M(-1)), can the rate constant be approximated to a pseudo-first-order rate expression: k(obs) = Kk. In all other cases, k(obs) = Kk/(1 + K(heterocycle)).