INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Lan-Qian Li,Xu-Hong Liu,Yong-Jian Tang,Zhen-Liang Xu
Fully aromatic polyamide (PA) membranes have been studied as nanofiltration (NF) membranes for decades because of their good chemical stability, but most of the membranes suffered from poor permeability and high rejection for monovalent ions. In this paper, an m-phenylenediamine (MPD)-based NF membrane was prepared by alkali activation on a reverse osmosis (RO) membrane. Characterization revealed the different etching paths on RO membranes fabricated by different concentrations of monomers of interfacial polymerization. The looser PA layer of RO membrane fabricated by lower-concentration monomers was easily invaded by NaOH molecules because of the higher molecular weight cutoff of 254 Da, which resulted in the transformation of separation grade from RO to NF. At the same time, the MPD-based NF membrane exhibited superior water permeability and pH resistance compared with a PIP-based membrane, which showed a potential to realize large-scale application in practical industry settings. It also provided a facile method for the preparation of a high-performance NF membrane with good chemical stability.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Yuxuan Ke,Shuzhen Chen,Suisui Su,Jiao Zhang,Shenghua Hu,Cuiqing Zhang,Changyuan Hu,Shizheng Zheng
Bi 2 O 3 has been recognized as a promising anode of aqueous secondary battery because of the high capacity, but the application is greatly hindered by the poor conductivity and limited actual capacity. Herein, for the first time, one dimensional (1D) α-Bi 2 O 3 nanobelt is fabricated via alkali etching strategy using rod-shaped Bi-MOF (CAU-17) as the self-sacrificial template. Specifically, high-crystalline and oxygen-deficient α-Bi 2 O 3 nanobelt with length and width of 6 μm and 300 nm are identified. The electrochemical results demonstrate the high specific capacity (247 mAh g −1 @1 A g −1 ) and acceptable stability of α-Bi 2 O 3 nanobelt. Such superior capacity is derived from the exposed electrochemical active sites, fast charge transfer and efficient ion diffusion in 1D high-crystalline and oxygen-vacancies enriched structure. The assembled Ni-Bi battery displays high capacity (78.3 mAh g −1 ) and high energy density of 100.2 Wh kg −1 (at power density of 2829.8 W kg −1 ). Our work provides rational guidance for architecting 1D high-capacitive electrodes for aqueous rechargeable alkaline battery.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Yazhou Liu,Jingwen Hu,Qiyong Zhu,Ping Yang,Yao Jiang,Xuezhi Zhang,Siying Wu
An innovative preparation approach was utilized to prepare bimetallic nanohybrid arrays of NiCo-LDH onto nickel foam through a hydrothermal technique. Then, 2,5-Dihydroxyterephthalic acid ligands were engaged to synthesize NiCo-MOF via a solvothermal method. Subsequently, an alkaline etching-induced technique transformed the bimetallic MOF back into LDH (designated as Et–NiCo-LDH), yielding a bimetallic hydroxide characterized by a denser nanohybrid array and a more abundant pore structure, thereby demonstrating exceptional specific capacitance. The resultant material exhibited a remarkable specific capacitance of 22.39 F cm −2 at a current density of 2 mA cm −2 (about 1194.16 F g −1 at 1 A g −1 .The loading capacity is 12 mg per square centimeter). After enduring 5000 galvanostatic charge-discharge cycles at a current density of 15 mA cm −2 , the material maintained 83.6 % of its initial capacity. Furthermore, when assembled into an asymmetric supercapacitor device with the as-synthesized Et–NiCo-LDH@NF composites serving as the positive electrode and activated carbon (AC) as the negative electrode, the device demonstrated an energy density of 671.42 Wh m −2 and a power density of 1399.99 W m −2 . Additionally, at a mass loading of 1 A g −1 , the energy density and power density were recorded as 45.04 Wh kg −1 and 350.37 W kg −1 , respectively, with a mass loading of 12 mg cm −2 . A capacity retention rate of 85.6 % was achieved after 5000 cycles. This study offers a straightforward method for producing uniform and dense bimetallic nanohybrid arrays tailored for applications in the capacitor field.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 16
·3110-3116
·
IF 4.034
Qiuru Wang,Yanyan Wang,Yafei Zhao,Bing Zhang,Yunyin,Niu,Xu Xiang,Rongfeng Chen
Technological applications of heterogeneous nanocatalysts on supports have generally relied on the surface or interface properties of supports. Herein, we report a facile approach to fabricate roughened surfaces on halloysite nanotubes (HNTs) through etching the wall of HNTs in a molten-salt system. SEM, TEM, XRD, FTIR, AFM and N2 adsorption/desorption analysis are employed to systematically investigate the morphology, structure and surface properties. The results suggest that the roughness of HNTs surface has been significantly increased and defects are formed on the tube wall without structural damage. Subsequently, the roughened halloysite nanotubes (RHNTs) are used as supports to prepare heterogeneous nanocatalyst. Pt nanoparticles with a uniform size can be homogeneously deposited onto the RHNTs surfaces via a one-step hydrothermal reduction. The as-prepared Pt@RHNTs catalyst exhibits remarkably improved activity and selectivity for the hydrogenation of cinnamaldehyde towards cinnamyl alcohol compared with the pristine halloysite support. Furthermore, Pt@RHNTs catalyst shows rapid catalytic rates in hydrogenation reactions and excellent leaching resistance in cycle uses.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2018
·Vol. 2019
·期 1
·51-58
·
IF 2.507
Hangle Guo,Tongguang Ge,Jian Lv,Changlin Du,Jian Zhou,Zhicheng Liu,Zile Hua
Graphical A facile and eco-friendly mesoporogen-free steam-assisted crystallization strategy has been developed for the synthesis of hierarchically structured ZSM-5 zeolites with superior MTP catalytic performance, and a new “in situ alkali etching-hydrothermal restoring“ mechanism is discussed. A series of hierarchically structured ZSM-5 zeolites (ZSM-5 HSZs) with a Si/Al ratio of about 200 have been successfully synthesized in the absence of additional mesoporous agents. XRD, N 2 sorption isotherms, SEM, TEM and NH 3 -TPD results showed that the obtained HSZs materials possess high crystallinity, interconnected micro/mesoporous structures and similar total acid amounts. Meanwhile, in the methanol-to-propylene (MTP) reaction, compared to the microporous counterpart, all synthesized ZSM-5 HSZs demonstrated superior performance benefitting from their hierarchical porous structures. Interestingly, 27 Al MAS NMR and Py-FTIR results confirmed the inter-transformation of framework and extra-framework Al species with the extension of materials crystallization duration and consequently the variation of materials surface acidity. As a result, the optimized catalyst achieved the highest initial propylene selectivity of 54.4 % and the longest catalyst lifetime ( t 90 ) of 175 h under the weight hourly space velocity (WHSV) of 1.0 g g –1 h –1 . Moreover, a new “in situ alkali etching-hydrothermal restoring“ mechanism has been proposed to elucidate the structural evolution of here reported high-silica ZSM-5 HSZs during the synthesis.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）