JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 5
·1098-1102
·
IF 0.399
Zhou Yong,Liu Fude,Wu Haiyan,Duan Lijie,Qu Boyang
One conjugated polymer consisting of carbazole and 3-hexylthiophene moiety, poly (N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole) (PNDC), has been synthesized by ferric chloride oxidative polymerization. The monomer N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole was synthesized and characterized by IR, 1 H-NMR, 13 C-NMR and MS. UV-vis absorption spectrum, fluorescence spectrum, photoluminescence spectrum and electrochemical properties of the polymer were investigated. Polymer PNDC shows maximum peak appearing at 394 nm in UV-vis absorption spectrum, strongest fluorescence-emission at 482 nm in fluorescence spectrum and maximum emission peak at 492 nm in photoluminescence spectrum. The band-gap ( E
g ), HOMO energy ( E
HOMO ), and LUMO energy ( E
LUMO ) of the polymer were obtained as 2.58, -5.32, and -2.74 eV, respectively.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 38
·期 1
·53-62
·
IF 2.804
Chen Tao,Zhong Guo-Cheng,Zhang Yuan-Ting,Zhao Li-Ming,Qiu Yong-Jun
Novel bio-based and biodegradable block copolymers were synthesized by “click” reaction between poly(L-lactide) (PLLA) and polyamide 4 (PA4). Upon tuning the molar mass of PLLA block, the properties of copolymers and electrospun ultrafine fibers were investigated and compared with those of PLLA and PA4 blends. PLLA and PA4 were found incompatible and formed individual crystalline regions, along with reciprocal inhibition in crystallization. Electrospun fibers were highly hydrophobic, even if hydrophilic PA4 was the rich component. The crystallinity of either PLLA or PA4 decreased after electrospinning and PLLA-rich as-spun fibers were almost amorphous. Immersion tests proved that fibers of block copolymers were relatively homogeneous with micro-phase separation between PLLA and PA4. The fibrous structures of copolymers were different from those of the fibers electrospun from blends, for which sheath-core structure induced by macro-phase separation between homopolymers of PLLA and PA4 was confirmed by TEM, EDS, and XPS.
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 10
·e5814
·
IF 3.14
Yongcen Lin,Xue Dong,Lang Zhao
N-ZIF-(1:0)@NiCo-LDH, N-ZIF-(1:3.5)@NiCo-LDH and N-ZIF-(0:1)@NiCo-LDH were prepared by mixing solvents in various volume ratios ( V methanol : V water = 1:0, 1:3.5 and 0:1) when synthesizing precursors. These composite materials were characterized using scanning and transmission electron microscopies, X-ray diffraction, X-ray photoelectron spectroscopy and nitrogen adsorption–desorption measurements, and investigated as catalysts for reduction of 4-nitrophenol, methyl orange and methylene blue. The NaBH 4 concentration as an important factor that may affect catalytic activity for reduction of 4-nitrophenol was examined. Under optimal experimental conditions, the excellent catalytic activity of the N-ZIF-(0:1)@NiCo-LDH composite, compared to that of N-ZIF-(1:0)@NiCo-LDH and N-ZIF-(1:3.5)@NiCo-LDH composites, could be attributed to the presence of graphitic nitrogen. In addition, compared with previously reported catalysts, all catalysts prepared show excellent catalytic activity owing to the unique structure exposing more active sites.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2015
·
IF 1.964
Tao Wu,Jingwei Wan,Xuebing Ma
Magnetic solid acid catalysts SO 4 2− /Zr(OH) 4 –Fe 3 O 4 were prepared using magnetic Fe 3 O 4 nanoparticles , ZrOCl 2 ·8H 2 O, and sulfuric acid as starting materials in the calcination temperature range 110–650 °C. The properties of the magnetic solid acid, such as loaded SO 4 2− content, acid distribution, surface morphology, and porous structure, were characterized. In the aqueous asymmetric aldol reaction of various benzaldehydes with strong electron-withdrawing groups (R = NO 2 and CN), good to excellent catalytic performance (83%–100% yield, 86.0%–95.6% ee anti , and anti/syn = 88–96/12–4) was achieved. These nanomagnetic solid acids can be quantitatively recycled from the reaction mixture using an external magnet and reused five times without significant loss of catalytic activity.
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2015
·
IF 3.893
Faheem Nawaz,Yongbing Xie,Hongbin Cao,Jiadong Xiao,YueqiuWang,Xihua Zhang,Mingjie Li,Feng Duan
Two series of α-MnO 2 materials were prepared via a similar method with surfactant cetyltrimethylammonium bromide (CTAB) and sodium dodecyl benzene sulfate (SDBS). The surfactants work both as shape directing agent and reduction initiator. The α-MnO 2 synthesized with 0.2 M of CTAB showed a mesoporous structure with high surface area of 387.7 m 2 /g. It is very active in catalytic ozonation of 4-nitrophenol (4-NP) and total organic carbon removal, with higher catalytic stability than commercial MnO 2 . Using tert -butanol and p -benzoquinone as scavengers of different oxidative species, we found that superoxide radicals, rather than hydroxyl radicals, were mainly responsible for the degradation of 4-NP.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 75
·71431-71440
·
IF 3.289
Di Lu,Lele Wen,Lixin Xue
For exploring more types of suitable polymeric membranes for application in alkaline fuel cells (AFCs), a series of 1,2-dimethylimidazolium functionalized poly(arylene ether sulfone)s containing 4-phenyl-pyridine units in the main chain (named as DIm-PPYPAES) were firstly synthesized as anion exchange membranes (AEMs) in this work. Proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared (FT-IR) spectroscopy were employed to characterize and confirm the chemical structure of the synthesized copolymers and the derived membranes. The DIm-PPYPAES membranes with different ionized levels ranging from 1.15 meq. g−1 to 1.77 meq. g−1, exhibited good thermal stability, solubility behavior and a relatively high level of hydroxide conductivity. The highest hydroxide conductivity of 83.35 mS cm−1 at 80 °C was achieved for the DIm-PPYPAES-4 membrane with a moderate IEC of 1.77 meq. g−1. Moreover, after 15 days of treatment with a 2 M NaOH solution at 60 °C, the DIm-PPYPAES membrane still exhibited relatively high ionic conductivity even above 10 mS cm−1 at 30 °C and retained their integrated shapes.
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2013
·
IF 0
Yun Xia Jiang,Hu Jin Zuo,Yong Jia Shen,Feng Ping Yi
The Friedel-Crafts acylation reaction between 5-cyanoindole and 4-chlorobutyryl chloride was conducted in ionic liquid 1-buty-3-methylimidazolium chloroaluminate ([bmiCl/AlCl3), the major product was 5-cyano-3-(4-chlorobuty) indole. The structure of the product was characterized by Mass and 1H NMR spectra. When the molar ratio of AlCl3 to [bmiCl in [bmiCl/AlCl3 is at 1:1 or less, no 5-cyano-3-(4-chlorobuty) indole could be obtained. The suitable molar ratios of AlCl3 to [bmiCl in [bmiCl/AlCl3 were from 2:1 to 3:1, the yields of the major product were from 68% to 70%, respectively. When the molar ratio of [bmiCl/AlCl3 to 5-cyanoindole was less than 2:1, the acylation reaction was difficult to carry out, because 5-cyanoindole would be not totally dissolve in [bmiCl/AlCl3 under the situation.
✓ 已验证
DOI
Journal of the Taiwan Institute of Chemical Engineers
·
2014
·
IF 2.637
Cunling Ye,Xueyuan Wang,Heping Wang,Zhike Wang
Three 4-methylimidazolium-modified silica adsorbents with different counter anions such as BF 4 − , PF 6 − and Tf 2 N − (named as SilprM 4 ImBF 4 , SilprM 4 ImPF 6 and SilprM 4 ImTf 2 N, respectively) were prepared and characterized. Three types of adsorbents were used to remove 2,4-dinitrophenol (2,4-DNP) from aqueous solutions under static and dynamic conditions. It was found that the adsorption capacity of 2,4-DNP increases according to the order: SilprM 4 ImTf 2 N < SilprM 4 ImPF 6 < SilprM 4 ImBF 4 , which was opposite to the van der Waals volume of these counter anions and consistent with the hydrophilicity of these counter anions. The reason could be related that counter anions with large van der Waals volume would have large space steric hindrance and be unfavorable for the anion exchange reaction. Counter anions with good hydrophilicity would dissociate from these materials easily and the anion exchange reaction could easily take place. Under dynamic conditions, the geometry shape of counter anions could affect the recovery yields of 2,4-DNP. Tetrahedron such as BF 4 − and Tf 2 N − had similar recovery yields of 2,4-DNP, while regular octahedron such as PF 6 − had slightly low recovery yields.
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2022
·
IF 0
Shariena Shamsul Bahari,Yuen Mei Lian,Ros Azlinawati Ramli,Lee Siew Ling
Textile dyeing often employs reactive dyes. The dye wastewater contains hazardous materials and is toxic to humans and the environment. Photodegradation using a semiconductor photocatalyst is a promising alternative approach for water purification and wastewater treatment. However, the photocatalyst’s low adsorption ability is a problem in the photocatalysis process. To compensate for this shortcoming, photocatalyst content must be combined with an adsorbent. Raw corn cob and titanium dioxide (TiO2) were used in this photocatalysis. Due to a synergistic impact, raw corn cob’s ability to adsorb and titanium dioxide’s ability to photodegrade organic pollutants from water bodies is expected to boost the removal performance. The degradation of Reactive Blue 4 (RB4) as a targeted dye was carried out in this research using a suspended mixture of commercial anatase TiO2 and raw corn cob under UV light. The effect of initial pH solution, initial dye concentration and contact time, TiO2-corn cob dosages, and the influence of other pollutants were investigated as factors influencing photodegradation-adsorption of RB4. The high removal rate of RB4 was obtained at a low pH of 2 and RB4 concentration of 40 ppm. The increased dose of TiO2-corn cob improved the RB4 dye removal performance. In conclusion, combining photodegradation and adsorption systems as a hybrid treatment method resulted in a synergistic increase in the efficiency of RB4 removal.
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Jie Liu,Zhiwei Zhao,Penghui Shao,Fuyi Cui
Heterogeneous catalysts with low cost, little hazardous, high effective and facile separation from aqueous solution are highly desirable. In this study, magnetic Fe 3 O 4 –MnO 2 core–shell nanocomposites with various Fe/Mn weight ratios were synthesized through a facile one pot method and then characterized. These as-synthesized solids were applied to activate the peroxymonosulfate (PMS) for 4-chlorophenol degradation. The sample 3 with a Fe/Mn molar ratio of 4:1, which can be separated conveniently through external magnetic field, exhibited higher activity than other Fe 3 O 4 –MnO 2 nanocomposites, pure MnO 2 and physical mixture of Fe 3 O 4 and MnO 2 . The effects of operational parameters on the catalytic activity of sample 3, including initial Oxone and pollutant dosage, pH and catalyst dosage, were assessed. The catalyst had high stability and good reusability according to five successive repeated reaction. The reactive radicals generated in the PMS/Fe 3 O 4 –MnO 2 nanocomposites system were sulfate radical (SO 4 − ) and hydroxyl radical ( OH). The enhancement of the nanocomposites may be attributed to the interaction of Fe 3 O 4 with MnO 2 on the basis of the in situ ATR-FTIR analysis and XPS spectrum.
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Lanxingyu Liu,Xingtao Zuo,Jiajie He,Yun Zhou,Juan Xiong,Cong Ma,Zhongbing Chen,Shuili Yu
The preparation of high-performance nanofiltration membranes with high permeability and selectivity is a great challenge. Herein, we proposed 2-Aminophenol-4-sulfonic acid (APS) and piperazine (PIP) co-deposition for the first time through the interfacial polymerization (IP) with trimesoyl chloride (TMC) to form a polyamide (PA) layer. APS-incorporated membrane had a thinner active layer (20–60 nm), larger pore size and smoother membrane surface as well as strengthened electronegative feature. The pure water permeability of the membranes reached 5.8 times that of the control membrane, up to 70.8 LMH/bar with 96.4% rejection for RB, 99.0% rejection for BSA and SA , respectively. More importantly, the optimal membrane showed pure water flux of 22.9 LMH/bar as well as 95.9% Na 2 SO 4 rejection. The retention performance of the membrane also exhibited high dye rejections towards MB, NR, MO above 93.6%, especially 98.0%, 98.3% and 99.1% for CV, CR and RB, respectively. Almost complete removal was achieved for natural organic matters (≥99.7%) in the meanwhile. Significantly, long-term performance stability of the APS-integrated membrane was demonstrated during the 120-h continuous filtration of dye, NOM, and salt solution, respectively. This work provides a loose nanofiltration membrane with regulatable structural morphology for water desalination, surface water and wastewater treatment .
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Suwanda Arachchige Don Rumesh MADHUSANKA,Boyu WANG,Shunchao MA,Hongyu WANG
Attributed to its medium operating potential of 0.8 V, the layered perovskite LiEuTiO 4 (LETO or L100) has been deemed as an appealing anode candidate for lithium-ion battery (LIB), circumventing the risk of lithium plating at a low potential of approximately 0 V while preserving the battery voltage. However, its inherent low conductivity and sluggish kinetics stagnate its practical use, and its compatibility with high-voltage cathode is still neglected. Therefore, we fabricate LETO@CNFWs (LC) composite using carbon nanofiber webs (CNFWs) as surface-modifier and scaffold. To fabricate this composite, firstly LETO and CNFWs compound was ball-milled according to different weight ratios. The balled-milled L100, LC20, LC5, and LC2 exhibit excellent electrochemical behaviors, nearly 133.6, 151.0, 181.0, and 200.0 mAh g −1 of specific charge capacities after 1000th cycles are acquired at 1 A g −1 , which are about one and half times higher than that of untreated LETO compared to LC2, and more stable cyclability stems from the enhanced conductivity and Li + transportation. Moreover, the full cell based on calcined LiNi 0.5 Mn 1.5 O 4 (LNMO-700 °C) and LC2, demonstrates considerable capacity with a high voltage plateau of about 4 V. As well, LC2||LNMO-700 °C full-cell exhibits 114.3 mAh g −1 superior specific charge capacity after 100 cycles at 0.1 A g −1 compared to L100|| LNMO-700 °C, LC20||LNMO-700 °C, LC5|| LNMO-700 °C. This surface-modify strategy here is instrumental to the realistic employment of LETO as a promising anode for a safe 4 V LIB with high capacity.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）