JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 30
·50731
·
IF 3.125
Mengqing Jiang,Yihua Yin,Weiquan Cai,Jingli Zhang,Lihong Fan,Ying Yi,Yue Dai,Ting Zhou,Jinsheng Liu
To improve photostability and enhance utilization rate and reduce pest resistance, a new strategy based on the combination of photodynamic insecticide action and stimulus-responsive polymer micelles is developed. 4-(phenylazo)benzoic acid (PBA)-modified poly(ethylene glycol) monomethyl ether (mPEG) conjugate is prepared by the esterification reaction of mPEG and PBA, and followed by self-assembly in aqueous solution to obtain polymeric nanoparticles. TEM shows that the nanoparticles have a core-shell structure and an average diameter of 78 nm. DLS shows that the nanoparticles are stability in water solution but can change their structure in response to UV light and/or esterase stimulation. The photodegradation of Protoporphyrin IX (PpIX) encapsulated in the nanoparticles can be effectively inhibited because of aggregation-caused quenching effect, whose maximum photodegradation rate is about 20.54% after 8 h exposure to daylight compared with the complete photodegradation of free PpIX. UV light and/or esterase stimulus can trigger PpIX release and result in a high photodynamic activity. Compared with free PpIX, the PpIX-loaded nanoparticles show a higher phototoxicity to insect cells and the daylight pretreatment has little influence on the phototoxicity.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shan Ni,Liangrong Yang,Hongnan Qu,Xiangyang Zhu,Zihao Xu,Menglei Yuan,Huifang Xing,Li Wang,Jiemiao Yu,Huizhou Liu
Exploring high-efficiency, robust and cost-effective catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) is greatly desirable. Herein, a series of transition-metal doped MoS 2 (M-MoS 2 , M = Mn, Fe, Co, Ni, Cu, Zn) with expanded interlayer spacing are fabricated by one-step solvothermal strategy. Notably, nickel doped molybdenum disulfide (Ni-MoS 2 ) is found to exhibit prominent catalytic activity with an apparent rate constant (K) of 1.09 min -1 and excellent stability over six continuous runs of recycling experiments. The results demonstrate that the expanded interlayer spacing (0.94 nm) can increase the active sites of reactant absorption, and Ni dopants can lower the energy level (d‐band center) to facilitate the desorption of H. Thus, the catalytic activity of Ni-MoS 2 is enhanced by synergistically structural and energy level modulation. This study offers an effective strategy to design transition metal sulfides with higher catalytic reactivity for the environment-related catalysis processes.
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高影响因子
ACS Applied Nano Materials
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2021
·
IF 5.097
Lin Guo,Zhu Mao,Chao Ma,Jiawei Wu,Lin Zhu,Bing Zhao,Young Mee Jung
Nanoscale materials have an irreplaceable advantage in solar energy utilization because of their perfect match with visible light wavelength on the length scale. Charge transfer (CT) between a metal nanoparticle and contacted nanoscale semiconductor plays a significant role in photoinduced energy transfer. Here, we fabricated a new complex, a gold nanorod-4-mercaptobenzoic acid@Cu2O (Au NR-MBA@Cu2O) core–shell nanostructure, and used surface-enhanced Raman scattering (SERS) spectroscopy of the interlayer MBA molecules to investigate the CT process occurring between the Au NRs and Cu2O. In our system, different surface plasmon absorption bands were adjusted by tuning the thicknesses of the Cu2O shells on the Au NR core to explore the influence of plasmon absorption at different incident Raman laser lines. By analyzing the SERS spectra, the degree of CT was calculated, and the consequences can be fully explained by photoexcitation across interface electron transfer and plasmon-induced interfacial charge transfer transition at laser excitation wavelengths of 633 and 785 nm. This experiment introduced a simple, effective, and intuitive approach to observe the CT process in metal semiconductors by SERS. The results of our study will improve in photocatalytic efficiency and photoelectric devices.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 1
·364-379
·
IF 3.553
Huo Hang,Jiang Yanqiu,Wang Zhe,Hu Yanjing,Zhao Tingting,Liu Xing,Xu Xianzhu,Lin Kaifeng
Abstract In this paper, urea group functionalized periodic mesoporous organosilica was utilized as matrix to introduce cobalt precursor into framework. After pyrolysis in nitrogen atmosphere, urea group was decomposed into carbon species and simultaneously the cobalt precursor was reduced to metallic cobalt nanoparticles. The metallic cobalt nanoparticles can be stabilized by coordinating to carbonyl oxygen atoms in carbon species. The supported metallic cobalt exhibited excellent catalytic performance towards 4-nitrophenol hydrogenation reaction. The largest turnover frequency number can reach up to 164.8 h −1 , and the reaction rate constant can be as high as 0.77 min −1 . The influence of pyrolysis temperature on catalytic performance was also investigated. Compared with the results obtained by samples prepared with wet impregnation method or different pyrolysis rate, it can be concluded that the coordination to carbonyl oxygen atom in carbon species plays a crucial role in improving electron transfer between metallic cobalt and carbon species during catalytic procedure. Graphic abstract Metallic cobalt nanoparticles with high dispersion were introduced into urea group functionalized mesoporous silica matrix via pyrolysis in nitrogen atmosphere. The coordination to carbonyl oxygen atom enhances the catalytic performance in 4-nitrophenol hydrogenation.
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Advanced Composites and Hybrid Materials
·
2020
·Vol. 3
·期 4
·541-545
·
IF 0
Li Weikang,Zhao Fengyang,Zhu Baocan,Kong Xia,Zhu Xixi,Liu Qingyun
Montmorillonite (MMT)-based composites are usually prepared by the absorption method, which results in the unstable MMT composites, because adsorbates are easy to drop down from MMT. In this work, 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (H 2 TCPP) molecules were grafted on interfaces of (3-aminopropyl)triethoxysilane (APTES)-pillared MMT by dehydration condensation reaction. X-ray diffraction (XRD) revealed that the interlayer space of the MMT was enlarged from 16.24 to 22.21 Å by introduction of APTES. Fourier-transform infrared (FT-IR) data verified the covalent bonding between APTES-pillared MMT and H 2 TCPP molecules. UV-Vis absorption spectra displayed that the Soret band of H 2 TCPP molecules in H 2 TCPP/APTES/MMT composites had a red-shift with 17 nm compared with that of the monomers, revealing that H 2 TCPP molecules assembled into J-aggregates. Moreover, H 2 TCPP/APTES/MMT composites were characterized by thermogravimetric analysis (TGA) and fluorescent spectrophotometer. The APTES-pillared MMT modified with porphyrin has a potential application in biomedicine and environment.
5,10,15,20-Tetrakis(4-carboxyphenyl)porphyrin (H 2 TCPP) molecules were grafted on interfaces of (3-aminopropyl)triethoxysilane (APTES)-pillared MMT by dehydration condensation reaction.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Qinghan Chen,Liu-Pan Yang,Dong-Hao Li,Jingying Zhai,Wei Jiang,Xiaojiang Xie
Modern liquid membrane based ion-selective electrodes (ISEs) require selective and lipophilic ionophores. For acetylcholine (ACh), an important neurotransmitter, there is still a lack of ionophores. We propose here a family of hydrophobic macrocycle Oxatub[4]arenes as ACh selective ionophores in potentiometric ISEs, which exhibited excellent stability, selectivity, and a lower detection limit of 100±20 nM. The stability constant of the acetylcholine-ionophore complex was determined to be (5.06±0.12) ×10 5 M −1 in PVC-NOPE membranes. The ACh ISEs were used to monitor the catalytic conversion of ACh to choline by the enzyme acetylcholinesterase. The concentration of ACh in mouse brain homogenate was also successfully measured. The proposed ionophores and ISEs are highly promising for continuous monitoring of ACh concentrations in complex biological samples.
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JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Xinan Shi,Lijian Huang,Daocheng Pan
In this research, a facile and environmentally friendly solution approach is developed to deposit Cu 2 ZnSn(S,Se) 4 thin films by addition of n -butylammonium butyrate ionic liquid . n -Butylammonium butyrate plays a critical role in solution deposition of Cu 2 ZnSnS 4 precursor thin film. We find that liquid n -butylammonium butyrate can dissolve a number of metal oxides , including Cu 2 O, ZnO, and SnO as well as various metal chlorides , metal nitrates and metal acetates. Smell-free Cu 2 ZnSnS 4 precursor solution is synthesized by dissolving Cu 2 O, ZnO, SnCl 2 and thiourea in an ethanol solution of n -butylammonium butyrate. Thermally degradable n -butylammonium butyrate can be completely removed by a low-temperature sintering process , forming high quality Cu 2 ZnSnS 4 nanoparticle thin film. A power conversion efficiency of 8.79% is obtained by this facile and green solution approach.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Wenrui Xiang,Ruijuan Qu,Xinghao Wang,Zunyao Wang,May Bin-Jumah,Ahmed A. Allam,Feng Zhu,Zongli Huo
Phenolic endocrine disrupting chemicals (EDCs) such as bisphenol A (BPA), 4-chlorophenol (4-CP) and nonylphenol (NP) are the most commonly detected pollutants in natural environments. The transformation of mixtures of the three phenolic pollutants during chlorination process was studied for the first time in this work. Single phenol can be effectively removed by free chlorine via electrophilic substitution and electron transfer reactions, with the generation of chlorinated phenols and self-coupling products. In mixture solution, the apparent second-order rate constants ( k app ) of 4-CP, BPA and NP at pH 8.0 was increased by 8.6%, 25% and 16%, respectively, as compared to the degradation of single-compound. According to the products identification and density functional theory calculations, the cross-coupling process can occur more easily than the self-coupling reaction, which might accelerate the removal of phenolic mixtures. In addition, humic acid (HA) exerts some inhibitory effect on the degradation of phenolic compounds, due to the competition for chlorine consumption and the reduction of phenoxy radicals to parent phenols. These findings shed light on the environmental fate of phenolic mixtures during aqueous chlorination process, which provide new information for the application of chlorination in water and wastewater treatment.
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FLUID PHASE EQUILIBRIA
·
2020
·
IF 2.838
Jinbei Yang,Shucui Han,Qiuju Xu,Meiqiong Yu
The density and viscosity of pure liquid 2, 4-dichlorofluorobenzene and 2, 6-dichlorofluorobenzene were measured in the temperature range of (318.15–348.15) K at the local atmospheric pressure of 99.8 kPa. The saturated vapor pressures of pure 2, 4-dichlorofluorobenzene and 2, 6-dichlorofluorobenzene and the isobaric vapor-liquid equilibria (VLE) data for the 2, 4-dichlorofluorobenzene + 2, 6-dichlorofluorobenzene binary system at atmospheric pressure were determined experimentally by a modified Rose still. The density values were accurately described by DIPPR equation. The viscosity data were well correlated using the Litovitz, Ghatee and VFT, and Andrade equations, and the VFT equation shows the best accuracy. Both Antoine and Riedel equations can well describe the relationship between saturated vapor pressure and temperature, which meet the requirements of engineering design. The Riedel equation is more accurate due to the lower average relative deviation. The VLE data were successfully correlated with NRTL and Wilson activity coefficient models, and the interaction parameters were obtained. The result indicates that there is no azeotrope in the binary mixture. The above thermodynamic properties of pure component and the VLE data presented are crucial for the design and operation of distillation for the isomeric mixture separation of 2, 4-dichlorofluorobenzene + 2, 6-dichlorofluorobenzene.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Hao Zhou,Xiaoying Zhu,Baoliang Chen
A novel magnetic catalytic composite (MBM) was developed by compositing α-MnO 2 with a magnetic biochar containing Fe 3 O 4 . XRD and EDS confirmed the crystalline structure and the chemical composition of MBM, while the one-dimensional α-MnO 2 nanorods were observed on MBM by SEM. 4-chlorophenol as a typical toxic chlorinated organic compound was selected as the model pollutant. Even the MBM composite (MnO 2 content: 0.2 g/L) needed the same time (120 min) as the pure α-MnO 2 nanorods (0.2 g/L) to completely remove the 4-chlorophenol (10 mg/L) with overdosed peroxydisulfate (PDS), MBM indicated faster pollutant removal rate than the pure α-MnO 2 nanorods in the first 100 min. It is possible that the adsorption of 4-chlorophenol by biochar might shorten the migration pathway of the generated active species to the pollutants, resulting the boosted removal rate. MBM was stable in the neutral environment which was desirable for the efficient pollutant removal. Both the radical quenching tests and the EPR spectra identified the main active specie generated by activation of PDS through MBM was singlet oxygen possibly generated by recombination of superoxide ions from the metastable manganese intermediates at neutral pH. TOC data of the effluent ensured 63.5% of the pollutant molecules were completely mineralized after the degradation. The applied magnetic field could recover MBM easily for reuse. This work shed lights on the preparation of highly efficient and environmentally friendly catalytic composites for PDS activation in persistent pollutant removal.
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PubMed
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
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2020
·
IF 0.512
Yang Yun-Xia,Xia Shi-Ying,Zhang Hai-Xia,Niu Hui-Hui
Three complexes of (CH3)4N+·(C15H15O2)2H-·H2O (1), (CH3)4N+·C15H15O2-·H2O (2), and 2(C2H5)4N+·2C15H15O2-·C15H16O2·3H2O (3) have been prepared under the similar conditions by using 2, 2’-bis (4-hydroxyphenyl) propane as the host and tetraalkylammonium as the guest. Then, the complexes were characterized by X-ray single crystal diffraction. The results show that 1 and 2 are two polymorphs, and in complex 3, only the magnitude of the template is different from the former two complexes. Although, the hydrogen bonding of three compounds are all related to the traditional O-H…O hydrogen bonds between the phenolic hydroxyl groups and water molecules, they eventually form various channel frameworks with different shape of cavities, such as the peanut-like channels in complex 1, the cross-shape in complex 2, and varied hexagonal-shape and tetragonal-shape cavities in complex 3. And the corresponding guest cations are contained in these channels to build the related stable crystal structures. Obviously, 2,2’-bis (4-hydroxyphenyl)propane, as a more flexible “V” type host molecule with terminal hydroxyl groups, can interact with tetraalkylammonium template and the auxiliary water molecules to construct different host lattices, showing excellent ability of forming hydrogen bonds.
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JOURNAL OF RARE EARTHS
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2020
·
IF 3.104
Xiaoru Zhao,Xinyu Jiang,Dongming Peng,Jie Teng,Jingang Yu
Three-dimensional (3D) graphene oxide-tris(4-aminophenyl)amine (GO-TAPA x:y ) composites with different GO-to-TAPA mass ratios ( x : y ) were prepared by a facile one-step ultrasonic treatment. GO-TAPA x : y composites were characterized by scanning electron microscopy (SEM), nitrogen (N 2 ) adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). Behavior and mechanism of GO-TAPA x:y composites for the adsorption of rare earth elements (REEs) were investigated. The adsorption capacities of GO-TAPA 1:2 composite for Yb 3+ , Er 3+ , Nd 3+ , La 3+ and Y 3+ are 30.88, 26.52, 20.60, 11.24 and 10.52 mg/g, respectively. Effects of some important parameters including GO-to-TAPA mass ratios, contact time, reaction temperature and initial Yb 3+ concentration on the adsorption were evaluated in detail. FTIR spectral and XPS analyses show that the metal complexations and ion exchanges between nitrogen/oxygen-containing species of the adsorbents and REEs are involved in the adsorption procedure besides the conventional adsorption based on specific surface area, indicating the introduction of specific molecules onto GO is beneficial to its adsorption ability. The convenient reusability and applicability of GO-TAPA x : y composites toward real samples also demonstrate their feasibility in the enrichment of REE ions.
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