Preparation and photocatalytic properties of Pt and Crco doped Nano TiO2 films 

Pt and Cr co doped Nano TiO2 film was prepared by the sol gel method. The film was characterized by AFM, XRD and UV Vis. The experiment showed that when the average TiO2 film diameter is 32 nm and the film thickness is 290 nm, the rate of photodegradation is 95% in 2.5 hours. Additionally, when the optimal co doping ratio for Pt Cr is n(Pt): n(TiO2) equals 0.03% and n(Cr):n(TiO2) equals 0.4%, the photodegradation of methylene blue for Nano TiO2 film can be enhanced. The photocatalytic properties of Pt and Cr co doped Nano TiO2 film is better than that of pure TiO2 and Pt, Cr separately doped TiO2 film.     

钛对草莓产量、品质影响的研究

匈牙利的I·Pais经多年研究后(1983)认为:钛是植物的一种有益元素。因此,笔者开展了钛在草莓上应用的研究,经两年的研究结果表明:对草莓于盛花期喷洒10ppm的钛溶液,可极显著增产(12-18%)。果实中V_c含量可增加7-30%,可溶性固形物的含量也增加,但有机酸的含量却显著减少;并可使其叶片中叶绿素含量显著增加(22-32%);且果实较对照提早3-4天着色,但不同品种的反应稍有不同。     

Improved biological effects of biomimetic nanoapatite coatings of titanium surface on osteoblasts-like viability

AIM: To investigate influence of biomimetic nanoapatite coatings of titanium surface on behavior of osteoblasts-like and provide evidence for surface modification and biological effects of titanium implant. METHODS: Biomimetic nanoapatite coatings were developed by functionally modified methods with a combination of topographic, chemical and biomimetic treatments on the surface of titanium (Ti) substrate. The biological behavior and bioactivity of functionally modified SLA implants with chemical and biomimetic treatments (SCB-treated Ti) were investigated to compare with untreated Ti and SLA Ti plates as controls. The cell attachment, proliferation, alkaline phosphotase (ALP) activity, cell morphology and differentiation were evaluated by using MTT, RT-PCR, scanning electron microscopy (SEM) and confocal laser-scanning microscope (CLSM) analysis system. RESULTS: The cell adhesion and proliferation were enhanced on functionalized titanium surface with nano-scale apatite compared to the controls. SEM micrographs also revealed that the osteoblast-like cells spreadly grew along the surface. Cell morphology and differentiation were further observed distinctly by CLSM graphs. Moreover, mRNA expression of alkaline phosphotase on the SCB-treated Ti increased obviously on the twelfth day compared with the controls. CONCLUSION: The in vitro results demonstrate the remarkable improvement on cell adhesion and proliferation of the biomimetic nanoapatite on SCB-treated Ti, which could improve early bone-implant interface bonding ability and be used for orthopaedic/dental implants.     

硫酸法钛石膏作为土壤调理剂在油菜上的施用效果研究

为研究钛白粉生产过程中经无害化处理的副产品钛石膏作为土壤调理剂的施用效果及安全性,试验对供试钛石膏通过成分鉴定—土柱淋溶—盆栽种植的方式,研究了钛石膏和钛石膏淋溶液中的有害元素含量以及钛石膏与土壤不同比例掺混后对油菜生长、产量和功能叶光合速率影响。结果表明:钛石膏主要成分为CaSO_4和Fe_2O_3,固体中的重金属含量均符合国家安全标准。钛石膏淋溶液中含有较少量的Ca~(2+)、Mg~(2+),不含其他有害物质,施用后不会随雨水和灌溉污染土壤和地下水。随着钛石膏添加比例的增加,油菜产量呈先增高后降低的趋势,过量的钛石膏施用会抑制油菜的生长。钛石膏与土壤按照1∶4体积比混合施用后效果最好,与常规土壤栽培方式相比,油菜出苗20天后功能叶蒸腾速率提高了11.86%;出苗30天后功能叶SPAD值增加了4.33%,收获时油菜株高提高了12.97%,产量增加了14.08%。相关性分析显示,油菜产量(y)与钛石膏添加比例(x)的关系为y=0.0001x~3-0.0212x~2+0.6966x+41.815(R~2=0.999 4),综合考虑函数及其他因素,在实际生产中若每公顷施用300t的钛石膏能起到最佳增产效果。     

紫色土壤风化发育程度与“钛值”关系的研究

在重庆地区按紫色土壤习惯命名采集各主要紫色地层母岩发育的54个土壤剖面样品,并进行全钛和无定形钛含量测定。结果表明:供试紫色土全钛含量范围为TiO22.70~23.9 g kg-1,平均值7.52±3.90 g kg-1;土壤全钛含量高低主要与成土紫色母岩有关,而受土壤风化发育程度的影响不大,在剖面中分布规律不明显;用土壤"钛值"(全钛/无定形钛)比较,各紫色地层母岩初期风化发育的土壤(如石骨子土)钛值大小与母岩基本保持一致,表现为:三叠系飞仙关组(T1f)>侏罗系蓬莱镇(J3p)>侏罗系自流井组(J1—2z)>侏罗系沙溪庙组(J2s)>侏罗系遂宁组(J3s)>白垩系夹关组(K2j);但随土壤风化发育程度加深,钛值显著降低,且钛值大小顺序与土壤硅铝铁率所描述的土壤风化发育程度结果基本吻合,二者达极显著相关(r=-0.809 1**),如果将紫色土壤钛值大小划分为Ⅰ~Ⅶ级,则可将不同风化发育度的紫色土壤归入相应的级别中,据此,可按级别对紫色土壤的风化发育程度做出描述。     

竹活性炭比表面积及其孔径对TiO_2/BAC光催化降解甲醛性能的影响

[目的]研究竹活性炭比表面积及其孔径对TiO2/BAC光催化降解甲醛性能的影响。[方法]以竹子为原料,按照不同浸渍比,用磷酸活化法制备不同孔径和比表面积的系列竹活性炭（BAC）作为载体;通过溶胶凝胶法制备负载型光催化剂（TiO2/BAC）,以水溶液中的甲醛作为目标污染物,考察所得的一系列负载型光催化剂的光催化性能;采用氮气吸附、SEM进行表征,研究了竹活性炭的孔径和比表面积对负载型光催化剂性能的影响。[结果]竹活性炭吸附和TiO2光解的协同效应使TiO2/BAC光催化剂对水溶液中甲醛的处理效率显著提高;比表面积较大、微孔较多、平均孔径为2~3 nm的竹活性炭有利于TiO2的负载,制备得到的复合光催化活性较高。[结论]为TiO2光催化剂的固化负载研究提供了理论依据。     

钛离子注入对3种石蒜属植物种子生物化学特性的影响

为探讨离子注入对石蒜属植物种子生物化学特性的影响,采用不同剂量的钛离子注入3种石蒜属植物种子,研究注入后钛离子对种子电解质外渗率(REC)、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)和发芽率的影响。结果表明:随着钛离子注入剂量的增加,3种石蒜属植物种子相对电解质外渗率不断上升;MDA含量先升后降,随后又小幅回升;SOD、POD活性先升后降,但峰值因离子注入剂量和植物不同而异;石蒜和换锦花种子CAT活性先升后降,中国石蒜种子CAT活性呈"升－降－升"的变化趋势;石蒜种子发芽率曲线呈"马鞍型",中国石蒜和换锦花种子发芽率呈"双马鞍型"曲线,能量为30keV的Ti+诱变石蒜种子的适宜剂量为25×1016ions·cm-2,适于中国石蒜和换锦花种子诱变的注入剂量分别是50×1016ions·cm-2和500×1016ions·cm-2。一定剂量的钛离子注入能激活细胞合成自由基清除酶的能力,3种石蒜属植物的种子发芽率、REC、MDA、SOD、POD以及CAT间存在不同程度的相关性,酶类物质通过相互协调作用减低自由基造成的伤害。     

钛合金表面火焰喷焊镍基耐磨涂层的组织和性能

采用火焰喷焊技术在T i 6A l 4V合金基体上制备了镍基耐磨涂层,研究了其显微组织、合金元素的扩散、显微硬度和干摩擦磨损性能。结果表明,喷焊涂层具有韧基体加硬质相的耐磨组织;涂层横切面的组织、显微硬度和合金元素的扩散沿层深方向呈现连续性和渐变性,基体和涂层表现为冶金结合;喷焊表层的显微硬度为933.2 HV,是基体钛合金的3倍以上;涂层在不同条件下的磨损量都较小,耐磨性有较大的提高,转速和温度对其耐磨性能影响较大。     

A Study Raising the Grade of Silico-titanium Ferroalloy

It is studied in this paper that the influences of various factors,such as the smelting temperature,the basicity of the slag,and the quantity of reductant on the titanium content of alloy,silicon content of alloy,TiO2 content of the remaining slag and the titanium recovery in smelting silico-itanium ferroalloy using silicoaluminium ferroalloy as reductant.With this study,the optimum techn ological parameters are obtained of raising the titanium content of alloy and re-$$$ucing the silicon content of alloy. The stable experiments in laboratory and factory using this opti-mum technological parameters are conducted.     

纳米TiO2对贮藏期南丰蜜桔抑菌性能研究（英文）

[目的]重点考察纳米二氧化钛对贮藏期南丰蜜桔的抑菌性能。[方法]以酞酸丁酯为原料,在无水条件下,采用溶胶-凝胶法合成纳米二氧化钛粉末,通过正交实验法确定制备纳米二氧化钛的最佳工艺条件,并利用XRD衍射仪进行结构表征。采用牛津杯法研究纳米二氧化钛悬浮液对寄生于南丰蜜桔常见菌类的活性抑制效果,并进行实证性保鲜实验。[结果]纳米二氧化钛平均粒径为14.6nm,实际平均产率可达90.83%,RSD（Relative standard Deviation）为0.86%。[结论]纳米二氧化钛对贮藏期南丰蜜桔具有一定的抑菌性能。