间苯二酚荧光光度法测定空气中的敌百虫

敌百虫在碱性溶液中与间苯二酚反应可生成荧光性的化合物。敌百虫的浓度在每２５ｍＬ０－１５０μｇ的范围内与荧光强度呈线性关系，回收率为９１％－１０２％，相对标准偏差为４．６％，检测限为０．０７０ｍｇ／ｍ＾３。研究了２３种离子和农药的干扰情况。     

Scalable Template Synthesis of Resorcinol–Formaldehyde/Graphene Oxide Composite Aerogels with Tunable Densities and Mechanical Properties

Resorcinol–formaldehyde (RF) and graphene oxide (GO) aerogels have found a variety of applications owing to their excellent properties and remarkable flexibility. However, the macroscopic and controllable synthesis of their composite gels is still a great challenge. By using GO sheets as template skeletons and metal ions (Co²⁺, Ni²⁺, or Ca²⁺) as catalysts and linkers, the first low‐temperature scalable strategy for the synthesis of a new kind of RF–GO composite gel with tunable densities and mechanical properties was developed. The aerogels can tolerate a strain as high as 80 % and quickly recover their original morphology after the compression has been released. Owing to their high compressibility, the gels might find applications in various areas, for example, as adsorbents for the removal of dye pollutants and in oil‐spill cleanup.     

间苯二酚在TiO2-石墨烯修饰玻碳电极上的电化学行为及测定

制备了TiO2-石墨烯修饰玻碳电极。用循环伏安法(CV)和差分脉冲伏安法(DPV)对间苯二酚在该修饰电极的电化学行为进行了研究。实验结果表明,在pH值为6.0的磷酸盐缓冲液(PBS)中,该修饰电极对间苯二酚具有良好的电催化作用。对TiO2-石墨烯用量、支持电解质、pH和扫描速度等实验条件进行了优化。在优化条件下,利用DPV测定,间苯二酚的氧化峰电流与其浓度在1.0×10-6～1.0×10-4mol/L范围内呈良好的线性关系,线性相关系数为0.995。检出限为2×10-7mol/L。将该方法应用于模拟水样中间苯二酚的测定,回收率为96.5～104.2%。     

Erbium(III) PVC Membrane Ion-Selective Sensor based on 4-(2-Thiazolylazo)resorcinal

Abstract

4-(2-Thiazolylazo)resorcinol (TR) was used as a new compound to play the role of an excellent ion carrier in the fabrication of an Er(III) membrane electrode. The electrode shows a very good selectivity toward Er(III) ions over a wide variety of cations, including alkali, alkaline earth, transition, and heavy-metal ions. The proposed sensor exhibits a Nernstian behavior (with slope of 19.6 ± 0.6 mV per decade) over a wide concentration range (1.0 × 10^?6 to 1.0 × 10^?2 M). The detection limit of the sensor is 6.6 × 10^?7 M. It has a very short response time, in the whole concentration range (～10 s), and can be used for at least 12 weeks in the pH range of 2.8–9.3. The proposed sensor was successfully applied as an indicator electrode for the potentiometric titration of a Er(III) solution, with EDTA. It was also successfully applied to the F^? ion determination in some mouthwashing solutions.     

Synergistic Effect of Phosphorus-Containing Montmorillonite with Intumescent Flame Retardant in Polypropylene

Phosphorus-containing montmorillonite (P-MMT) was successfully prepared via intercalating resorcinol bis(diphenyl phosphate) (RDP) into montmorillonite (MMT) layers, and was utilized as a synergistic agent in the polypropylene/melamine pyrophosphate/pentaerythritol (PP/MPP/PER) intumescent flame retardant (IFR) system. The synergistic effect of P-MMT and IFR was investigated by dynamic mechanical analysis (DMA), thermogravimetry (TG), limiting oxygen index (LOI), UL-94 test, cone calorimeter test (CCT), and scanning electron microscopy (SEM). It was found that P-MMT could significantly improve the thermostability and flame retardancy of the PP/IFR composite. When 2.0 wt% P-MMT replaced the same amount of IFR in the composite, both the onset decomposition temperature (T _onset) and the maximum-rate decomposition temperature (T _max) of the PP/IFR composite were increased by more than 14°C. Meanwhile, the LOI value was increased from 29.5% to 32.5%, the UL-94 rating was enhanced from V-1 to V-0, and the heat release rate (HRR), total heat release (THR), and mass lose rate (MLR) were decreased dramatically, which proved that P-MMT had a good synergistic effect with IFR in flame retardant PP.     

石墨烯/铁氰化钴复合膜修饰玻碳电极同时测定对苯二酚、邻苯二酚和间苯二酚

采用滴涂法和电沉积法制备了石墨烯/铁氰化钴复合膜修饰玻碳电极. 用扫描电镜对该纳米复合膜进行了表征.用循环伏安法研究了对苯二酚(HQ)、邻苯二酚(CT)和间苯二酚(RS)在修饰电极上的电化学行为. 实验结果表明, 相对于裸玻碳电极和石墨烯修饰电极, HQ, CT 和RS 在石墨烯/铁氰化钴修饰电极上的氧化峰电流显著提高. 利用差分脉冲伏安法测定, HQ, CT 和RS 分别在1.0×10^－6～1.5×10^－4 mol/L, 1.0×10^－6～2.0×10^－4 mol/L 和3.5×10^－6～2.5×10^－4 mol/L浓度范围内与氧化峰电流呈良好的线性关系, 相关系数分别为0.991, 0.993 和0.992. 信噪比为3 时, HQ, CT 和RS 检出限分别为2.0×10^－7, 2.1×10^－7 和3.5×10^－7 mol/L. 将该方法用于水样分析, 回收率为95.6%～106.1%.     

DFT方法研究间苯二酚-甲醛气凝胶单体分子性质与振动频率

用B3LYP密度泛函方法在6-311G**基组水平上计算了单元、二元羟甲基间苯二酚的分子体积和振动频率,通过理论计算与实验结果的比较,探讨了间苯二酚-甲醛气凝胶形成的微观机理,具体分析了各振动模式的归属和同位素取代对振动频率的影响.     

Graphene Paper with Sharp‐edged Nanorods of Fe−CuMOF as an Excellent Electrode for the Simultaneous Detection of Catechol and Resorcinol

A flexible composite paper Fe?Cu‐based metal‐organic framework (MOF)/reduced graphene oxide (rGO) (Fe?CuMOF/rGO) electrode was prepared by using a simple electrochemical method for the simultaneous detection of catechol (CC) and resorcinol (RC). Free‐standing, flexible and double‐sided Fe?CuMOF/rGO composite paper was obtained by applying the electrochemical deposition process on the rGO paper electrode in the solution containing Fe?CuMOF composite. The morphological analysis of Fe?CuMOF/rGO composite paper showed that sea urchin‐like structures formed on the rGO electrode surface consist of numerous sharp‐edged nanorods of Fe?CuMOF. Flexible Fe?CuMOF/rGO paper electrode exhibited high sensitivity, wide linear range and low detection limit for the simultaneous determination of CC and RC. The linear ranges of concentration for CC and RC were 0.1–800 and 0.1–720 μM, respectively, and the corresponding limits of detection (S/N=3) were 0.016 and 0.020 μM. The outstanding performance of this flexible electrode could be attributed to the sharp‐edged urchin‐like Fe?CuMOF structures which provide an increment of the surface area and the electrochemical activity of the composite paper electrode. Stability tests showed that Fe?CuMOF/rGO composite paper electrode has excellent flexibility, high durability, and good reproducibility. Furthermore, this electrode exhibited high sensitivity and selectivity for the determination of CC and RC in real sample analysis.     

两亲型杯芳烃诱导ZnO微纳结构的合成及光催化性能

回流条件下将两亲型杯芳烃,即丙基间苯二酚杯[4]芳烃(PRCA)、己基间苯二酚杯[4]芳烃(HRCA)和壬基间苯二酚杯[4]芳烃(NRCA),应用于诱导制备ZnO微纳结构,采用X射线衍射、扫描电镜、紫外可见漫反射光谱、红外光谱、X射线光电子能谱等分析了所制备ZnO样品的组成、形貌与微观结构,并以罗丹明B为模型污染物考察了所制备杯芳烃保护的ZnO样品的光催化性能。表征结果显示当杯芳环下缘所连直链烷基中含较多碳原子个数时(HRCA和NRCA),可调控ZnO粒子的尺寸和形貌;而无保护剂和下缘连接较短直链烷基的间苯二酚杯[4]芳烃(PRCA)调控ZnO形貌的能力较弱。模拟太阳光照射下,HRCA-ZnO和NRCA-ZnO的光催化效率相近且均高于无保护剂制备的ZnO和PRCA-ZnO。