查找使用阿拉丁产品的科研文献

Urea-activated 4,4'-oxibis-(benzenesulfonyl hydrazide) as foaming agent for low-density unsaturated polyester resin manufacturing

Yi-Fan Zhang,Xiao-Jun Wang,Zhi-Gang Pan,Cheng-Ming Hong,Gao-Feng Ji

The activation of foaming agent is critical to its application. In this study, 4,4′-oxibis-(benzenesulfonyl hydrazide) (OBSH) activated by urea was used in the manufacture of low-density unsaturated polyester resin (LDUPR), and the results were compared with that of OBSH activated by zinc oxide and zinc stearate. The experiment results showed that the activation of OBSH by urea was better than by zinc oxide or by zinc stearate. A novel hydrogen bond activation mechanism of urea is presented in this research. Two stages, including the induction stage and the foaming stage, were proposed in the LDUPR manufacture according to the gas evolution curves of activated OBSH. The decomposition temperature and the decomposition time of OBSH activated by urea were determined to match the gelation time of UPR for the manufacture of LDUPR. The disadvantageous chemical behaviors of activated OBSH were eliminated in the induction treatment. The activated OBSH via induction treatment released gas maximally and distributed gas homogeneously in the resin glue, resulting in a better foaming effect than that of the previous foaming agents. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42824.

Synthesis of β-cyclodextrin/mesoporous attapulgite composites and their novel application in adsorption of 2,4,6-trichlorophenol and 2,4,5-trichlorophenol

Xudong Zheng,Jiangdong Dai,Jianming Pan

In this work, mesoporous attapulgite (mATP) was firstly prepared in the presence of the cetyltrimethylammonium bromide using attapulgite (ATP) as the matrix materials. Then, it was modified by β-cyclodextrin (β-CD) to obtain the β-cyclodextrin/mesoporous attapulgite composites (β-CD/mATP). The characterization of the composites showed that β-CD/mATP composites remained excellent channel structure and the value of the specific surface area was 300.30 m2/g. As-prepared β-CD/mATP was evaluated as sorbents to adsorption of 2,4,6-trichlorophenol (2,4,6-TCP) and 2,4,5-trichlorophenol (2,4,5-TCP). The results of the batch mode experiment revealed that the Langmuir isotherm model fitted the equilibrium data better, while the kinetic data could be described by pseudo-second-order model perfectly. Furthermore, 2,4,5-TCP adsorption onto β-CD/mATP was more affected than that of 2,4,6-TCP in the presence of competitive phenolic compound. In addition, β-CD/mATP possessed excellent regeneration property.

Co-sensitization of TiO2 nanotube arrays with polymerized aromatic amines and its application in photoelectrochemical cathodic protection

Chunli Wang,Nazhen Liu,Ning Wang,Zheng Ma,Yong Tian,Lifei Wang,Xuwei Chen,Baorong Hou

In this work, an initiator-free polymerization of 4,4′-diaminobiphenyl (DABP) happened on the TiO 2 nanotube arrays (TNT/Ti) via a facile in-situ solvothermal synthesis method. The poly-4,4′-diaminobiphenyl (PDABP) modified TNT/Ti (PDABP/TNT/Ti) composite was fully characterized by SEM, XRD, FTIR, and XPS. The prepared PDABP/TNT/Ti exhibited stronger visible light absorption, improved separation of photogenerated charge carriers, reduced charge transfer resistance at the interface, and enhanced reducing capability of photoelectrons (as indicated by the more negative energy level of the conduction band, E CB ). Attributed to the formation of the type II heterostructure between TiO 2 and PDABP, the PDABP/TNT/Ti showed enhanced photoelectrochemical (PEC) cathodic performance by polarizing the potential of 304 stainless steel (304SS) to ∼−900 mV in a 3.5 wt% NaCl. By replacing monomers, the strategy of enhancing the PEC cathodic protection performance of TNT/Ti using electrically conducting polymers of aromatic amines was confirmed to be simple and effective.

Pyrene-alt-dibenzothiophene-S,S-dioxide copolymers for highly efficient photocatalytic hydrogen production: The role of linking pattern

Chang Cheng,Xunchang Wang,Feng Wang

Two analogous positional polymers P16PySO and P27PySO have been synthesized via the copolymerization from dibenzothiophene-S,S-dioxide and pyrene building blocks. The effect of the linking pattern on the molecular packing, photophysical and photocatalytic properties of the two isomers was investigated. It was interestingly found that a minor change at the substitution position of pyrene unit was demonstrated to largely influence the photocatalytic properties of the two isomers. P16PySO exhibited an encouraging average hydrogen evolution rate (HER) of 619.5 μmol h −1 and the maximum HER of 774 μmol h −1 , much higher than that of 2,7-counterpart with a moderate rate of 282 μmol h −1 . The increased photocatalytic activity of P16PySO is mainly ascribed to its more ordered molecular packing, broader absorption region, better wettability , and higher photo-generated charge mobilities. Moreover, the optimum HER was increased from 774 to 1013 μmol h −1 when the amount of the photocatalyst P16PySO was increased from 50 to 100 mg, which is among the top solar-to‑hydrogen conversion efficiencies reported so far for the polymeric photocatalysts.

Micro-nano bubbles enhanced degradation of emerging contaminants by ferrous-oxalate complexes: synergistic interaction between oxidation and coagulation

Li Ping,Huang Xiaojiang,Yang Qing,Xia Haozhe,Li Chunbo,Zhang Zhiqiang,Wang Xuan,Lu Jinsuo

The activation of oxygen by ferrous (Fe 2+ ) to generate ·OH for contaminants degradation was inhibited due to the low utilization of oxygen, thus limiting its application in the practical environment. In this study, with the superior oxygenation capacity of micro-nano bubbles (MNBs) and the stronger O 2 activation capacity of Fe 2+ -oxalate complexes, the MNBs/Fe 2+ /oxalate (Ox) system was constructed with 4,4′-sulfonyldiphenol (BPS) as the main target emerging contaminants (ECs), and to investigate the enhancement contribution and reinforcement mechanism of the involvement of MNBs to the removal efficiency of ECs in the Fe 2+ /Ox system. It was shown that the MNBs/Fe 2+ /Ox system could effectively degrade four structurally diverse ECs. In this case, with BPS as the main target contaminant, adding MNBs could increase the BPS removal efficiency by about 35%. In the MNBs/Fe 2+ /Ox system, the degradation rate of BPS depended on the concentration of Fe II (Ox) 2 2− , while the extent of degradation was mainly governed by Fe II (Ox) 2 2− and Fe II (Ox) 0 . EPR and probe experiments showed that the reactive oxygen species (ROS) produced by the system and the iron hydroxide complexes produced by Fe 3+ hydrolysis contributed to the degradation of BPS by oxidation and coagulation, respectively. In particular, ·OH and O 2 •− were the main reactive oxygen species produced by this system. Moreover, the involvement of MNBs significantly increased the formation of ROS and iron hydroxide complexes in the Fe 2+ /Ox system. The oxygenation process of MNBs used in this study enhanced the contaminants degradation performance of the Fe 2+ /Ox system and has broadened the application scope of MNBs.

Determination and Analysis of Solubility of 4-[2-(N-Methylcarbamyl)-4-pyridyloxy]aniline in Ten Pure Solvents and Three Binary Solvent Mixtures at Different Temperatures (T = 278.15–323.15 K)

Zhi Wang,Liang Yao,Ting Wang,Zilong Cui,Jingling Ye,Yonghong Hu

In this study, the data on solid–liquid equilibrium of 4-[2-(N-methylcarbamyl)-4-pyridyloxy]aniline were studied by the gravimetric method. The solubility of 4-[2-(N-methylcarbamyl)-4-pyridyloxy]aniline was measured in 10 pure solvents (ethyl acetate, tetrahydrofuran, acetonitrile, dichloromethane, acetone, methanol, acetylacetone, n-propanol, n-butanol, and water) and three binary solvent mixtures (water + tetrahydrofuran, acetone + n-butanol, and ethyl acetate + n-propanol) in the temperature range of 278.15 to 323.15 K under atmospheric pressure. The experimental results show that the solubility of 4-[2-(N-methylcarbamyl)-4-pyridyloxy]aniline in the abovementioned solvents increases with the increase of temperature. Among the 10 pure solvents, ethyl acetate has the highest solubility. The improved Apelblat model, Buchowski–Ksiazaczak λh model, Redlich–Kister (CNIBS/R-K) model, and Jouyban–Acree model are used for nonlinear fitting of experimental data, and the KAT-LSER model is also used to study the relationship between the solubility of 4-[2-(N-methylcarbamyl)-4-pyridyloxy]aniline in pure solvents and the interaction between solvent and solute molecules. The physical and chemical information of 4-[2-(N-methylcarbamyl)-4-pyridyloxy]aniline provided in this report may help its extraction/separation, recrystallization, purification, and formulation development.

C–C bond coupling differences between β-O-4 and 4-O-5 ether bonds over hydrophobic mesoporous Ru/MY-O catalysts: from lignin model compounds to polycyclic alkanes

Zhuang Li,Zi-Chun Fan,Xiang Bai,Xian-Yong Wei,Yierxiati. Dilixiati,Qian-Qian Kong,Ji Zhao,Yong-Hui Feng,Jun-Long Wang,Xing Fan,Xiao-Yan He,Hai-Xu Zou,Zhi-Min Zong

MY zeolites with mesopores were prepared by hydrothermal method using functionalized SiO 2 (F-SiO 2 ) as a silica source, and hydrophobic bifunctional Ru/MY- O catalysts were obtained by deposition precipitation method and silylation treatment. This work aims at obtaining polycyclic alkane (PCA) based high-density hydrocarbon fuels (HDHFs). We focused on the catalytic hydroconversion (CHC) of 2-phenoxy-1-phenylethanol (PP-ol) and oxydibenzene (ODB), two typical lignin-related model compounds (LRMCs), over Ru/MY- O . The effects of different reaction conditions and catalysts on the product distribution in PP-ol and ODB were investigated. The partial hydrogenation of ODB was found to be a necessary step before achieving C-O ether bond cleavage and C-C bond coupling. The balance of metal/acidic sites is critical for maximizing PCA yields. Changes in the metal/acid ratio had a greater effect on PCA yield in PP-ol than in ODB. Poor stability of cycloalkyl cations and partial hydrogenation of ODB hinder the generation of C-C coupling products. The incorporation of mesopores and hydrophobic treatment were found to weaken the negative effects of C-C bond coupling products and water on the catalyst. The conversion of Ru 3 /MY- O was improved by nearly 10% compared to Ru 3 /Y in the fifth cycle reaction. This work provided a theoretical basis for the generation of HDHFs from lignin.

Uniform monolayer Cu2ZnSn(S,Se)4 film based on novel precursor solution

Qing Zhou,Meinan Yan,Yuzhou Sun,Yujiao Ma,Zihan Zhang,Haoyu Xu,Xiaoyun Teng,Chao Gao,Wei Yu

In this paper, we reported a novel precursor solution for the preparation of Cu 2 ZnSn(S,Se) 4 (CZTSSe) film. Large-grain monolayer CZTSSe film can be obtained by using the precursor solution. The influence of selenization temperature on the properties of CZTSSe films and solar cells were investigated. We found the monolayer CZTSSe film can be prepared with the selenization temperature as low as 510 °C. While an increased selenization temperature was used, the size of the crystalline grains in CZTSSe film increased significantly, but the decomposition of CZTSSe material got more serious. As the increase of the selenization temperature, increased short-circuit current (J SC ) can be achieved for the fabricated solar cell, which could be caused by the improved crystallinity of CZTSSe layer and the enlarged depletion width of solar cell (as much as 391 nm). On the other hand, the open-circuit voltage (V OC) decreased as the increase of selenization temperature, which may relate with the decomposition of CZTSSe material. The best solar cell achieved the efficiency of 11.4% (active area), which was based on CZTSSe film with the selenization temperature of 510 °C.

Fully stoichiometric Cu2BaSn(S1−xSex)4 solar cells via chemical solution deposition

Chen Wang,Qinghua Yi,Qiang Zhang,Fumao Wang,Guifu Zou

Cu2BaSn(S1−xSex)4 has shown great prospects in the photoelectric field due to Earth-abundance, low toxicity, cost efficiency, direct bandgap, high absorption coefficient (>104 cm−1) and reduced anti-site disorder relative to Cu2ZnSn(S1−xSex)4. A fully-tunable ratio of S/Se is the key to broaden the bandgap of Cu2BaSn(S1−xSex)4. Here, we introduce a thionothiolic acid metathesis process to readily tune the stoichiometry of Cu2BaSn(S1−xSex)4 films for the first time. Different stoichiometric Se/(S + Se) of Cu2BaSn(S1−xSex)4 from zero to one can vary the bandgap range from 2 to 1.68 eV. The grain size of Cu2BaSn(S1−xSex)4 films can be grown more than 10 μm. The optimized bandgap and high-quality growth of Cu2BaSn(S1−xSex)4 films ensure the best power conversion efficiency of 2.01% for solution-processed Cu2BaSn(S1−xSex)4 solar cells. This method provides an alternative solution-processed way for the synthesis of fully stoichiometric Cu2BaSn(S1−xSex)4.

The crystal structure of 1-(4-bromophenyl)-3-(2-chlorobenzyl)urea, C14H12BrClN2O

Zhihong Zhu,Lilei Zhang

C 14 H 12 BrClN 2 O, monoclinic, P 2 1 / c (no. 14), a  = 13.4072(6) Å, b  = 8.6103(5) Å, c  = 12.3824(6) Å, β  = 100.475(4), V  = 1405.60(12) Å 3 , Z  = 4, R gt ( F ) = 0.0499, wR ref ( F 2 ) = 0.1215, T = 173 K.

Vanadium-Catalyzed Synthesis of 4(3H)-Quinazolinones from Anthranilamides and Aryl Aldehydes

Dan Zhan,Tianbin Li,Xiaoping Zhang,Chuan Dai,Haidong Wei,Yuyu Zhang,Qingle Zeng

Deep Desulfurization of Fuels by Extraction with 4-Dimethylaminopyridinium-Based Ionic Liquids

Qianli Wang,Lecheng Lei,Jingke Zhu,Bin Yang,Zhongjian Li

In this work, three 4-dimethylaminopyridinium-based ionic liquids (ILs), N-ethyl-4-dimethylaminopyridinium dicyanamide ([C24DMAPy][N(CN)2]), N-butyl-4-dimethylaminopyridinium dicyanamide ([C44DMAPy][N(CN)2]) and N-hexyl-4-dimethylaminopyridinium dicyanamide ([C64DMAPy][N(CN)2]), were synthesized and then demonstrated to be efficient for aromatic sulfur compounds extraction from fuels. The mutual solubility evaluating results indicated that 4-dimethylaminopyridinium-based ILs hardly dissolved in the fuels, while the solubility of 97# gasoline in ILs varies from 7.0 wt % for [C24DMAPy][N(CN)2] to 12.4 wt % for [C64DMAPy][N(CN)2] and the solubility of 0# diesel in ILs varies from 6.7 wt % for [C24DMAPy][N(CN)2] to 9.7 wt % for [C64DMAPy][N(CN)2]. Also, the sulfur partition coefficient was evaluated. In the case of model gasoline, the thiophene (TS) partition coefficient in model gasoline varies from 0.885 for [C24DMAPy][N(CN)2] to 1.218 for [C64DMAPy][N(CN)2]. In the case of model diesel, 4-dimethylaminopyridinium-based ILs exhibit a relatively higher sulfur partition coefficient, compared to alkyl modified pyridinium-based ILs. 1H NMR results confirmed that the high aromatic π-electron density of the dimethylaminopyridinium cation was the main reason for the good extraction performance. 1H NMR results also confirmed the KN sequence for each IL ([C24DMAPy][N(CN)2] < [C44DMAPy][N(CN)2] < [C64DMAPy][N(CN)2]) is mainly due to the sulfur compounds and ILs structures. Furthermore, the extractive selectivity results indicated a more preferable extraction of TS than toluene with 4-dimethylaminopyridinium-based ILs. To have a better evaluation of the overall sulfur extraction performance, the three 4-dimethylaminopyridinium-based ILs were compared to other typical ILs (e.g., pyridinium-based ILs and imidazolium-based ILs), which suggested our synthesized 4-dimethylaminopyridinium-based ILs exhibited good balance between mutual solubility and the sulfur partition coefficient. ILs after use were regenerated by a water dilution process. Based on these results, 4-dimethylaminopyridinium-based ILs can be used as potential extractants for EDS processes.