甲基橙光谱法测定杀菌剂中DDBA的含量

十二烷基二甲基苄基铵(DDBA)是一种广泛使用的杀菌剂。基于甲基橙(MO)与DDBA在水中能够形成离子复合物使其吸收光谱显著改变的现象,建立了一种简单、快速测定DDBA的方法。该方法检测的线性范围是6～40μmol·L^-1,线性方程为y=-0.01556x+0.7784,其线性相关系数R² 为0.9964,检出限为0.58μmol·L^-1。溶液中的常见阴离子、溶液pH值和温度对该检测方法都没有明显影响。用精确度、精密度和灵敏度等方法进一步验证了该方法的可靠性。该方法应用于商品新洁尔灭消毒液中的DDBA测定,结果满意。     

钛硅复合氧化物晶体结构及光催化性能研究

用溶胶-凝胶法制备了TiO2和钛硅复合氧化物,对样品进行了X射线衍射(XRD)、比表面积测试(BET)和紫外-可见漫反射光谱(DRS)分析,并以甲基橙为模拟污染物,考察了其光催化性能.结果发现,添加硅能有效的阻碍TiO2晶型转变,抑制TiO2晶粒生长,细化晶粒,增大粒子的比表面积,加入硅还能使TiO2带隙能增加,使其具有更强的氧化还原能力;钛硅复合氧化物具有较高的光催化活性,当煅烧温度为900℃,添加硅的摩尔分数为20;时,光催化活性最佳.     

甲基橙制备实验的衍生与探索

通过对经典基础有机化学实验——甲基橙制备实验的衍生,将合成制备反应与光谱分析结合,设计成小综合实验,以达到学科交叉的目的。改良后的实验有利于学生对偶氮苯类化合物性质的进一步认识,提高固体有机化合物的合成操作技能,同时还可掌握光谱分析方法与科学前沿知识,拓宽基础实验训练的单一性,有助于培养学生科学思维方法。     

杂多酸/聚乙烯醇复合膜的制备及光催化性能研究

合成了过渡金属取代的硅钨酸盐K₆SiM(H₂O)W₁₁O₃₉(M=Co、Ni、Cu,简称为SiMW₁₁),利用硅钨酸(H₄SiW₁₂O₄₀·nH₂O,简称为SiW₁₂)与SiMW₁₁做母体,分别将它们负载于聚乙烯醇(polyvinyl alcohol,PVA)上,制成一系列杂多酸/聚乙烯醇复合膜光催化剂,利用IR、SEM进行了表征.以高压汞灯为光源,分别研究了SiW₁₂/PVA、SiCoW11/PVA、SiNiW₁₁/PVA、SiCuW₁₁/PVA复合膜对有机染料甲基橙的光催化脱色,它们都具有很高的催化活性,60 min内对甲基橙的脱色率均可达到90%以上,其中SiW₁₂/PVA复合膜效果最好,12 min内脱色率达100%.提高SiW₁₂负载量可有效提高膜的光催化活性,当SiW₁₂与PVA质量比为1:1时催化活性最高.     

Solution-Processed White Circularly Polarized Organic Light-Emitting Diodes Based on Chiral Binaphthyl Emitters

By combining the blue and orange CPL or functionalized bis-benzoxanethones emitters (S-/R- BN-tCz and S-/R- BN-PXZ ), warm white CP-OLEDs were fabricated using solution-processed single emitting layer strategy. The successful realization of white CP-EL benefited from the same stable binaphthyl chirality and similar rigid structure of the two emissive CPL emitters. The devices exhibited the low turn-on voltage of ≈4.3 V, maximum luminance of ≈10200 cd m⁻² and maximum current efficiency of ≈2.0 cd A⁻¹. Most significantly, the devices with CIE coordinates of (0.32, 0.45) displayed intense CP-EL signals in the spectral range of 450 to 650 nm, and showed stable g_EL values of ≈10⁻³ as the luminance increased from 100 to 6000 cd m⁻². To the best of our knowledge, this work provides for the first time a simple and feasible strategy to fabricate solution-processed white CP-OLEDs based on the co-doping of the CPL emitters.     

Modulating the Electron-Donating Ability of Acridine Donor Units for Orange–Red Thermally Activated Delayed Fluorescence Emitters

The development of thermally activated delayed fluorescence (TADF) emitters with orange–red emission still lags behind that of their blue, green, and yellow counterparts. Recent research to address this problem mainly focused on developing new acceptor units. There were few donor units designed especially for orange–red emitters. Herein, with benzothiophene fused to a diphenylacridine donor unit, a new donor moiety, namely, 5,5-diphenyl-5,13-dihydrobenzo[4,5]thieno[3,2-c]acridine (BTDPAc), was designed and synthesized. Benefiting from the strong electron-donating ability of the new donor moiety, a new TADF emitter, 2-[4′-(tert-butyl)(1,1′-biphenyl)-4-yl]-6-[5,5-diphenylbenzo[4,5]thieno[3,2-c]acridin-13(5H)-yl]-1H-benzo[de]isoquinoline-1,3(2H)-dione (BTDPAc-PhNAI), shows an orange–red emission with a maximum at 610 nm in dilute toluene solution. Also, with the help of the diphenyl rings of the donor unit, high photoluminescence quantum yields were achieved for BTDPAc-PhNAI over a wide concentration range. Consequently, an orange–red organic light-emitting diode based on BTDPAc-PhNAI achieved a high external quantum efficiency of nearly 20 %, which was comparable to state-of-the-art device performances with similar emission spectra.     

多媒体柑桔栽培专家系统

通过对园艺专家的柑桔栽培知识的研究,研制了多媒体柑桔栽培专家系统MOES,MOES将柑桔生产分为品种选择、改土建园、繁育壮苗、定植与嫁接、田间管理、病虫害防治、采收与贮藏7个子系统,采用描述型知识、数据型知识、规则型知识、集合型知识等知识表示形式,配以土壤信息系统（GIS）、超文本数据库、图片数据库=知识规则库等专家决策支持系统,采用“产生式”、“决策树”和“加权模糊逻辑”的方法构建了品种决策、播期决策、定植密度决策、肥料决策和病虫害诊断五个决策模块。以Authorware为开发工具设计了MOES的我媒体流程图,程序采用构件化技术设计。     

119Sn Mössbauer spectroscopic insight into the effect of surface-located tin dopant cations on the visible-light photocatalytic activity of anatase TiO2

The presence of Sn⁴⁺ dopant ions on the surfaces of titania crystallites results in a nearly fourfold increase in the rate constant of a white-light photocatalytic bleaching reaction of methyl orange. Thus, the positive effect of a Sn^II electronic lone pair, which was theoretically predicted in 2013 by Iwaszuk and Nolan for a SnO-nanocluster modified anatase model, can be experimentally revealed using catalyst powders containing surface-located oxidized Sn⁴⁺ species.