Advanced Composites and Hybrid Materials
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2020
·Vol. 3
·期 4
·541-545
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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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TALANTA
·
2021
·
IF 6.057
Wei Gao,Ye Wang,Feng Zhang,Sen Zhang,Hong-zhen Lian
Effective protein adsorption by solid matrices from complex biological samples has attracted attention for broad application in biomedical field. Immobilization of calixarenes to solid supports is an essential process for their application in protein separation and purification. Silica is the most widely used support material in calixarene immobilization. With high concentration of polymer microspheres as templates, the large pore mesoporous silica microspheres with controllable, uniform size and structure were successfully synthesized and the resulting large pore mesoporous silica microspheres were modified with water-soluble tetrasulfonate calix[4]arene of unique hollow cavity-shaped structure. The tetrasulfonate calix[4]arene modified large pore mesoporous silica microspheres (SCLX4@LPMS) were characterized by diverse analytical techniques and their protein adsorption performance were also investigated. The obtained SCLX4@LPMS gave rise to an adsorption efficiency of >90% for cytochrome c and lysozyme within a wide pH range of 3.0–10.0 and possessed remarkably high adsorption capacity of cytochrome c (363.64 mg g −1 ) and lysozyme (166.11 mg g −1 ). The retained cytochrome c and lysozyme can be readily eluted by using phosphate buffer solution containing NaCl as a stripping reagent with the recoveries of 81% and 86% after 5 times enrichment, respectively. The SCLX4@LPMS microspheres have been applied for the selective adsorption of proteins in real samples and had the application potential in protein adsorption, drug delivery, biosensors, and other biomedical fields.
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PubMed
高影响因子
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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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
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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高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1518-1528
·
IF 5.721
Jin Zhang,Linjuan Pei,Jie Wang,Pengqi Zhu,Xianmo Gu,Zhanfeng Zheng
Ru/TiO2 catalysts exhibit excellent catalytic performance for selective reduction of 4-nitroacetophenone to 4-aminoacetophenone at normal temperature and atmospheric hydrogen pressure. Moreover, 99.9% selectivity to 4-aminoacetophenone can be obtained over 2.7 wt% Ru/TiO2(anatase) catalyst even in a relatively wide temperature (55–115 °C) and time (1–12 h) range. Its excellent catalytic performance is derived from the activation of H2 on the Ru nanoparticles at atmospheric pressure and the strong interaction of nitro groups with the support surface. Additionally, Ru nanoparticles supported on different crystalline TiO2 phases (anatase and rutile) result in different reaction pathways for 4-nitroacetophenone. Since the Ti–Ti distance on the rutile surface is smaller than that on the anatase surface, the hydroxylamine species adsorbed on the Ti atoms of rutile are more susceptible to the coupling reaction. Therefore, Ru/TiO2(rutile) causes a series of intermediates to accumulate during the conversion process, while Ru/TiO2(anatase) allows the highly selective conversion of 4-nitroacetophenone to 4-aminophenone. In addition, Ru/TiO2(anatase) can achieve chemoselective reduction of nitroaromatics to the corresponding anilines in the presence of –CN, –CHO, and –COOH, especially nitroaromatics containing CC and CC, indicating the excellent applicability.
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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
FLUID PHASE EQUILIBRIA
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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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Renqiang Cao,Shaoyuan Shi,Yujiao Li,Bin Xu,Zhijuan Zhao,Feng Duan,Hongbin Cao,Yujie Wang
Fouling of anion exchange membranes (AEMs) is the bottleneck restricting electrodialysis technology, and surface modification is an effective way to solve this problem. This paper investigated the effects of different components such as single poly (sodium 4-styrene sulfonate) (PSS), single polydopamine (PDA) and mixed polydopamine and poly (sodium 4-styrene sulfonate) (PDA@PSS) used as the modifier, respectively, on the surface properties and antifouling performance of AEMs. Comparing the surface properties of different modified AEMs, it was found that the surface hydrophilicity and negative charge density of PDA@PSS modified AEM (PDA@PSS-M) were obviously improved due to the combined action of PDA and PSS. The desalination rate, surface morphology and relative content of surface S element of different AEMs after the fouling experiments were also analyzed. The results indicated that PDA@PSS-M presented the greatest antifouling performance among three modified AEMs. The effect of PDA@PSS co-deposited layer on its desalination performance was negligible and the modification layer had relatively good stability.
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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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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
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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高影响因子
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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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Dan Liu,Bing-Bing Lu,Wen-Yuan Pei,Zhen-Yi Gu,Jin Yang,Xing-Long Wu,Jian-Fang Ma
The development of new and efficient anode materials for lithium-ion batteries (LIBs) has attracted considerable attention. Herein, a new polyoxometalate-based metal-organic framework (POMOF), [Mn 4 (L)(SiW 12 O 40 )·(DMF) 2 ·(H 2 O) 6 ]·4OH·4DMF·7H 2 O ( 1 ), was prepared with a resorcin [4]arene-based ligand (L), Keggin-type [SiW 12 O 40 ] 4- anion and Mn(II) cation (DMF = N,N′ -dimethylformamide). Compound 1 has a layer structure sandwiched by [SiW 12 O 40 ] 4- anions. The high specific capacity and excellent cycling stability are achieved by using 1 as an anode material for LIBs. The high electrochemical performance of compound 1 is attributed to the good electron storage and reversible multi-electron redox properties of [SiW 12 O 40 ] 4- anions within the framework.
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