CHEMICAL ENGINEERING SCIENCE
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2013
·
IF 2.386
Zhen Wang,Mengxiang Fang,Yili Pan,Shuiping Yan,Zhongyang Luo
A novel membrane vacuum regeneration (MVR) technology was developed to achieve lower regeneration energy demand for CO 2 absorption process. Sixteen different amine-based absorbents including primary, secondary, tertiary amines, polyamines, diamines, and sterically hindered amines were analyzed by combined absorption–desorption screening experiments for selecting the most effective absorbents for CO 2 membrane vacuum regeneration (MVR) technology. The CO 2 absorption experiments were conducted in a hollow fiber membrane contactor (HFMC) at 25 °C and 12.5 kPa CO 2 partial pressure. The CO 2 rich solvent was regenerated at 75 °C and 20 kPa regeneration pressure by using the MVR technology. The chain length, number of functional groups, side chain, and number of hydroxyl groups of amines were investigated to get a better understanding on the effects of the structure in the MVR process. The results show that the tertiary amines have greater regeneration performances than the primary amines, but the CO 2 absorption rates of the tertiary amines are worse than the primary amines. For the polyamines, the absorption performance of polyamines can be improved by increasing the number of amine groups while the MVR performance of the polyamines can be reduced. Steric hindered amines exhibited greater MVR performances. In addition, amines with steric hindrance effect caused by the substitution of hydroxyl group or methyl group to amine group in structure has also shown good performance in the MVR process for CO 2 desorption. The overall performance of amine-based absorbents was also investigated by an absorption–desorption characters analysis. It shows triethylenetetramine (TETA) and N -methyldiethanolamine (MDEA) have great average CO 2 absorption rates and relatively high cyclic capacities per mole absorbent, and ethylenediamine (EDA) is considered to be the promising absorbent as cyclic capacity in mol CO 2 /kg absorbent. Diethanolamine (DEA) and 2-Amino-2-methyl-1-propanol (AMP) are found to have the best overall performances in terms of CO 2 absorption rate at lean loading and cyclic capacity in mol CO 2 /mol absorbent. In terms of overall performance, MDEA is mostly recommended for using in MVR process. Sweeping steam can significantly improve MVR performance in most selected absorbents except AMP and 2-amino-2-hydroxymethyl-1,3- propanediol (THAM) absorbents which present the potential to reduce the regeneration energy demand by operating without sweeping steam. The study also finds that MVR shows better regeneration performance as compared to traditional thermal regeneration process at the same regeneration temperature.
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高影响因子
SYNTHETIC METALS
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2014
·
IF 2.222
Ting Zhou,Yong Qin,Juan Xu,Yongxin Tao,Mohong Lu,Yong Kong
A simple method to synthesize Zn 2+ doped poly(aniline- co - m -aminophenol) (PANMA), Zn-PANMA, for supercapacitors is reported. Capacitive behaviors of the copolymer based supercapacitor in 1 M H 2 SO 4 electrolyte were examined by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge/discharge. The morphological characteristics of Zn-PANMA and PANMA doped with Fe 3+ and Cu 2+ were investigated by field emission scanning microscopy (FESEM), explaining the different capacitive behaviors of these transition metal ions doped PANMA. A specific capacitance of Zn-PANMA as high as 631 F g −1 was achieved at a current density of 0.5 A g −1 , due to the enhancement of the electrochemical properties of the copolymer by Zn 2+ doping. Moreover, the specific capacitance still remained 71.7% after cycling for 800 times, exhibiting a good cycling performance and structure stability of Zn-PANMA.
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PROGRESS IN ORGANIC COATINGS
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2015
·
IF 2.358
Mehdi Derradji,Noureddine Ramdani,Tong Zhang,Jun Wang,Lin-dan Gong,Xiao-dong Xu,Zai-wen Lin,Abdelkhalek Henniche,H.K.S. Rahoma,Wen-bin Liu
A new type of nanocomposites was prepared by reinforcing a high performance bisphenol-A phthalonitrile resin with different amounts of silane surface modified titania nanoparticles. The effect of the nanofillers amount on the thermal, mechanical, and corrosion protective properties was investigated. Thermogravimetric analysis shows that the starting decomposition temperatures and the residual weight at 800 °C were highly improved upon adding the nanofillers. At 6% nanoloading, the glass transition temperature and the storage modulus were considerably enhanced reaching 364.4 °C and 3.2 GPa, respectively. The tensile strength and modulus as well as the microhardness values increased with the increasing of the nanoparticles amount. The tensile modulus calculations were investigated using Series, Halpin–Tsai, and Kerner models. Haplin–Tsai model was found to reproduce the experimental data with the best accuracy. Finally, results from electrochemical impedance spectroscopy revealed that the neat resin and its related nanocomposites offer excellent corrosion protective properties.
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SYNTHETIC METALS
·
2015
·
IF 2.252
Xiucui Ji,Qiang Xu,Ting Zhou,Xiaotong Wang,Hui Xu,Xue Yao,Wei Lan,Yong Kong
Poly(aniline- co - m -aminophenol)(PANMA)/graphene/NiO nanocomposite was synthesized and applied as a supercapacitor electrode for the first time. Graphene/NiO nanocomposite was first synthesized via a hydrothermal synthesis method from Ni(NO 3 ) 2 ·6H 2 O, urea, and graphite oxide. NiO nanoparticles were distributed uniformly on both sides of the graphene. Then, PANMA was deposited in situ on the surface of the graphene/NiO nanocomposite via the copolymerization of aniline and m -aminophenol. The obtained nanocomposite has a similar porous morphology with that of PANMA. Experimental results indicate that the synergistic contributions from PANMA, graphene and NiO enable the composite electrode with substantially improved energy storage performance metrics. The nanocomposite shows a high specific capacitance of 562 F g −1 at a current density of 0.5 A g −1 , a good rate capability even at high current densities and a better long-term cycling stability.
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JOURNAL OF CHROMATOGRAPHY A
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2013
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IF 4.612
Xiao-Dong Cheng,Xi-Tian Peng,Qiong-Wei Yu,Bi-Feng Yuan,Yu-Qi Feng
The present study described the preparation of a novel phosphate ester-bonded silica (PES) stationary phase based on “thiol-ene” click chemistry. The composition of the surface grafts of PES stationary phase was determined by elemental analysis and solid state 31 P MAS NMR. Due to its hydrophilic phosphate-ester groups and short hydrophobic alkyl chains, the PES stationary phase exhibited dual retention mechanism via complexation and hydrophobic interactions with phenols. Benefiting from this special interaction mechanism, the newly synthesized PES stationary phase showed better selectivity in the separation of phenols compared to commercial octadecylsilyl-bonded silica (C18) columns. Furthermore, the separations of 10 nucleosides and nucleobases on the PES stationary phase were achieved in both reversed-phase liquid chromatography (RPLC) mode and hydrophilic interaction liquid chromatography (HILIC) mode.
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PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 27
·期 7
·882-888
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IF 1.757
Mehdi Derradji,Noureddine Ramdani,Lin-dan Gong,Jun Wang,Xiao-dong Xu,Zai-wen Lin,Abdelkhalek Henniche,Wen-bin Liu
In the present work, zinc oxide nanoparticles were treated with aminopropyl trimethoxy silane-coupling agent and used as a new kind of reinforcement for a typical high performance bisphenol-A-based phthalonitrile resin. The resulted nanocomposites were characterized for their mechanical, thermal, and optical properties. Results from the tensile test indicated that the tensile strength and modulus as well as the toughness state of the matrix were all enhanced with the increasing of the nanoparticles amount. Thermogravimetric analysis showed that the starting decomposition temperatures and the residual weight at 800°C were highly improved upon adding the nanofillers. At 6 wt% nanoloading, the glass transition temperature and the storage modulus were considerably enhanced reaching about 359°C and 3.7 GPa, respectively. The optical tests revealed that the neat resin possesses excellent UV-shielding properties, which were further enhanced by adding the nanofillers. Furthermore, the fractured surfaces of the nanocomposites analyzed by scanning electron microscope exhibited homogeneous and rougher surfaces compared with that of the pristine resin. Finally, the good dispersion of the reinforcing phase into the matrix was confirmed by a high resolution transmission electron microscope. Copyright © 2015 John Wiley & Sons, Ltd.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2014
·Vol. 161
·期 9
·H573
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IF 2.859
Yong Kong,Ting Zhou,Yong Qin,Yongxin Tao,Yong Wei
Graphene plays a decisive role in the electrocatalytic copolymerization of aniline and m-aminophenol. The electrochemical activity of the obtained copolymer has an improved pH dependence compared with polyaniline. The results of Fourier transform infrared spectroscopy, electrochemical quartz crystal microbalance, atomic force microscope, and ultraviolet-visible spectroscopy reveal the ion exchange behaviors of the copolymer, indicating that it could be a potential candidate for the effective electrochemical removal of toxic Cr(VI) from industrial wastewater.
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POLYMER COMPOSITES
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2017
·Vol. 39
·期 10
·3705-3711
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IF 2.324
Mehdi Derradji,Abdelkhalek Henniche,Jun Wang,Abdul Qadeer Dayo,Jia-hu Ouyang,Wen-bin Liu,Aboubakr Medjahed
A new kind of nanocomposites was prepared from a high performance phthalonitrile resin and Ti 3 SiC 2 MAX phase ceramic nanoparticles. The synergistic combination of both phases led to nanocomposites with improved thermal and mechanical properties. For instance, the thermal conductivity and tensile properties of the neat resin were highly enhanced on adding more nanofillers contents. Moreover, the phthalonitrile resin toughness was enhanced by 123% at the maximum nanoparticles loading of 15 vol.%. The experimental investigations were also compared with predictions from Series, Halpin-Tsai, and Kerner models and a full discussion was provided. A high resolution transmission electron microscope confirmed the ability of the MAX phase to create a conductive network, especially at high nanofillers amounts. SEM analyses of the tensile fractured surfaces revealed positive changes in the morphology, such as an increase in the roughness and amount of hackling as well as the formation of multiple micro-cracks. The MAX phase also enhanced the thermal stability, stiffness, and glass transition temperature of the neat resin. This work confirms the superiority of the MAX phase ceramics over the traditional ones in enhancing the properties of the phthalonitrile resin and opens the way for further research in the field. POLYM. COMPOS., 39:3705–3711, 2018. © 2017 Society of Plastics Engineers
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Nuanfei Zhu,Xiangheng Niu,Zheng Liang,Yixing Tian,Hongyi Yin,Ze Qiao,Zhen Zhang
Enzymatic cascade reactions with high activity and specificity in living cells always benefit from multicompartmentalized organelles that provide separately confined spaces for enzymes, avoiding their mutual interference to ensure the high-efficiency operation of necessary vital movements. Inspired by this, we designed a 3D spherical microreactor (Au@H-APF@Pt) with biomimetic cascade catalysis for glucose detection. First, ultrasmall gold nanoparticles were immobilized in situ on the internal cavities of hollow 3-aminophenol formaldehyde resin (H-APF) nanospheres, along with glucose oxidase activity. Then, platinum nanoparticles (PtNPs) with peroxide-like activity were reduced surrounding the outer layer of the H-APF nanospheres. Similar to the cell structure, different metal sites in this bifunctional microreactor operated independently, bringing higher catalytic activity and selectivity and thus being synergistically capable of a cascade reaction to catalyze the substrate for glucose detection. This cell-mimicking microreactor (Au@H-APF@Pt) was successfully applied in glucose colorimetric detection, showing a 1.9-fold activity enhancement compared to direct mixing (Au/Pt). The observed low catalytic activity was attributed to the extended time for transferring hydrogen peroxide (H2O2) from Au NPs to the solution and then to PtNPs. Integrating a smartphone APP, a real-time, visual, and Au@H-APF@Pt-based hydrogel sensor for glucose detection was also proposed. Satisfactory results highlight that this cell-mimicking microreactor offers a very successful strategy to improve the efficiency of cascade catalysis systems in biosensing.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2017
·
IF 2.858
Xiaodong Quan,Jixiao Wang,Song Zhao,Wei Cai,Zhi Wang,Shichang Wang,Xianbao Cui
Poly( m -aminophenol) (PmAP) was prepared by oxidation polymerization of m -aminophenol in alkaline medium and characterized by scanning electron microscopy (SEM), FT-IR spectra, UV–visible absorption spectra and X-ray photoelectron spectroscopy. The antibacterial behavior of PmAP was characterized by stepwise dilution method, and the results demonstrate that the PmAP displayed excellent antibacterial property against both Gram-negative Escherichia coli and Gram-positive Bacillus subtilis . Furthmore, epoxy coatings containing different amount of PmAP using cardanol-based phenalkamine as curing agent were prepared. The coatings containing PmAP exhibited higher antibacterial activity against Escherichia coli and Bacillus subtilis. In addition, the antifouling property of the coatings was investigated by immersing the films in bacterial suspension for four days. The results showed that the coatings containing PmAP possessed high ability to inhibit the formation of biofilm which is the key process to prevent the occurrence of biofouling in the initial stage. Meanwhile, the coatings with PmAP possessed high corrosion protective performance shown by immersion tests in 12% NaCl solution monitored by the electrochemical impedance spectroscopy (EIS). The experimental results might give some new insight into designing and application of multifunctional materials used in the preparation of coatings.
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JOURNAL OF CONTROLLED RELEASE
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2024
·
IF 10.5
Haixin Tan,Ziwei Hu,Jiajun Miao,Bin Chen,Huaan Li,Junbin Gao,Yicheng Ye,Wenxin Xu,Jiamiao Jiang,Hanfeng Qin,Hao Tian,Fei Peng,Yingfeng Tu
The development of an intelligent nanomotor system holds great promise for enhancing the efficiency and effectiveness of antitumor therapy. Leveraging the overexpressed substances in the tumor microenvironment as propellants and chemotactic factors for enzyme-powered nanomotors represents a versatile and compelling approach. Herein, a plasma amine oxidase (PAO)-based chemotactic nanomotor system has been successfully developed, with the ability to enzymatically produce toxic acrolein and H 2 O 2 from the upregulated polyamines (PAs) in the tumor microenvironment for active tumor therapy. Zwitterionic polymeric nanoparticles with superior biocompatibility are synthesized, followed by PAO modification via electrostatic interactions. As expected, the resulting nanomotor system exhibits positive chemotaxis toward PAs concentration gradient. Upon reaching the tumor region, our nanomotors, actuated by the tumor microenvironmental PAs, effectively enhance diffusion and enable deep penetration into the tumor site. This leads to the induction of tumor apoptosis and simultaneous inhibition of tumor invasion and migration by decomposing PAs into toxic products. By smartly utilizing the consumption of these local chemotactic factors and their enzymatic products, our nanomotor system provides a versatile and intelligent platform for active and enhanced tumor therapy.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yu Sun,Yongjian Xu,Wenjing Li,Xiaopeng Yue
Natural fiber-based sound-absorbing materials have received more and more attention due to the increasingly severe noise pollution. However, the current natural fibers’ sound-absorbing materials often have poor flame-retardant performance and degradability, which limits their further application. In this study, flame-retardant cellulose fiber (FRCF) was prepared by modifying softwood fiber, and a kind of fiber-based sound-absorbing material, natural fiber-based sound-absorbing composite (NFSC), was prepared by replacing glass fiber with FRCF. The results show that the synthesis of FRCF is successful, and the functional groups containing phosphorus and nitrogen introduced into the cellulose side chain can significantly improve the thermal stability of softwood fiber. FRCF is able to bestow initial flame-retardant capability on the NFSC, allowing NFSC to get the V-1 level in vertical burning test with fewer flame retardants, and the limiting oxygen index (LOI) of NFSC can reach 28.5 %. The NFSC with FRCF instead of glass fiber also has better sound absorption performance; its maximum sound absorption coefficient reaches 0.90, and its noise reduction coefficient (NRC) reaches 0.45. This work is expected to provide inspiration for the design and preparation of environmentally friendly natural fiber-based sound-absorbing materials.
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危险品化学品经营许可证（带存储）