CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Tian-Yu Liu,Cong Wang,Yong-Zhe Han,Chang Bai,Hai-Tao Ren,Yong Liu,Xu Han
Bi 2+x WO 6 are a group of reactive photocatalysts in the photooxidation of various contaminants. However, their catalytic reactivity in the persulfate (PS)-based oxidation processes in the absence of light is still unknown. In this study, Bi 2.15 WO 6 shows a high reactivity in the catalytic oxidation of bisphenol A (BPA) by PS in the absence of light under alkaline conditions, and 20 mg L -1 BPA can be rapidly removed within 30 min at pH 10.0 with the low stoichiometry ratio of 1.79 between consumed PS and removed BPA. Characterizations of the oxidation products indicate that 98.4% of soluble BPA has been oxidatively polymerized to BPA polymers, instead of being oxidized to CO 2 and H 2 O. FTIR, Raman, XPS and electrochemical analyses confirm that surface Bi(III) is the reactive site for the adsorption of BPA and PS, which then initiates reactions between BPA and PS. DFT calculations reveal that the O-O bond in PS is moderately activated via the nonradical pathway after adsorbing on Bi(III), instead of being decomposed to SO 4 •− , followed by H-abstraction from BPA by the activated PS with the formation of phenoxyl radicals and the subsequent polymerization to BPA polymers. The apparently lower energy barrier from adsorbed BPA (Δ G = 0.056 eV) than that from dissolved BPA (Δ G = 0.263 eV) further reveals that H-abstraction from adsorbed BPA to the activated PS on the surface of Bi 2.15 WO 6 is more favorable than that from dissolved BPA. This study gives new insight on the efficient removal of recalcitrant contaminants via the H-abstraction pathway.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2017
·
IF 0
Ming Lu,Zhen Yun Zhao,Zu Lan Liu,Zhi Ping Mao
The polypyrrole-coated cotton fabrics were prepared via in situ chemical oxidative polymerization. The polymerization time of 120 min and reaction temperature of 25 °C were employed in this study. The major factors on electricities of the fabrics, including types of oxidants and molar ratio of pyrrole monomer to oxidant, were studied. Ferric trichloride hexahydrate (FeCl3·6H2O), ammonium persulfate ((NH4)2S2O8) and sodium periodate (NaIO4) were selected to carry out the synthesis of polypyrrole. When FeCl3·6H2O acted as oxidant, the optimum conductivity of 4×10-3 S·cm-1 could be obtained by changing molar ratio of Py to FeCl3·6H2O. By contrast, the highest conductivity of fabrics which used (NH4)2S2O8 as oxidant was 1.8 ×10-4 S·cm-1. The evolution of resistivities, morphology, surface chemistry and mechanical strength were characterized by a four-points probe resistivity system, scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and mechanical test instrument.
研究领域:
材料科学
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纺织工程
✓ 已验证
DOI
Journal of the Taiwan Institute of Chemical Engineers
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2016
·
IF 2.848
Ke Zhou,Yaochi Liu,Zhaoguang Yang,Houzhi Liu,Ting Xie
A novel bio-based oxidized polymeric material PAO-CIO was prepared, characterized and evaluated for its sorption toward U(VI) from aqueous solution. PAO-CIO was prepared using Cyclosorus interruptus as a novel supporter, which oxidized by sodium periodate and sodium chlorite, obtaining the oxidized particles, then surface-modified by γ-methacryloxypropyl trimethoxysilane, followed by a graft polymerization reaction and an amidoximation reaction. The SEM, TEM, XPS, FT-IR and XRD were used to characterize the adsorbent. Langmuir, Freundlich and Temkin models were appropriate for fitting the equilibrium data. According to the Langmuir model, the maximum sorption capacity (420.2 mg/g) was achieved with pH 5.0, temperature 50 °C. The sorption process was insensitive to the interference of other ions. A mixture desorption solution containing 5% NaCl (w/v) and 5% of HCl (v/v) could regenerate the U(VI)-loaded PAO-CIO completely. The sorption capacity only reduced 7.61% after six cycles compared to that of the fresh PAO-CIO. Therefore, PAO-CIO could serve as a cost-effective, efficient and novel adsorbent for U(VI) removal from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2020
·
IF 3.286
Yao Lu,Shan Wang,Chuanxi Xiong,Guo-Hua Hu
This work presents a method for the synthesis of a liquid-like polythiophene (L-Pth) by chemical oxidative polymerization of thiophene in dichloromethane. FeCl 3 was used as an initiator and nonylphenol polyoxyethylene ether (NPES) as a dopant . The structures and physicochemical properties of the L-Pth were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), fluorescence spectroscopy and ultraviolet-visible photometer (UV–vis). Unlike conventional polythiophene, L-Pth is composed of NPES and polythiophene, and part of NPES is doped on the thiophene backbone. It exhibits a liquid-like behavior at room temperature. It is typical of a semiconductor with a relatively high electric conductivity of 1.2 S m −1 . Moreover, it turns high-energy blue light (in the ranges of 400–480 nm) into relative low-energy green light (peak at 515 nm), which makes it a potential filler for preparing a blue light protection film for eyes protection. The combination of the liquid behavior, excellent solubility and good electric conductivity also makes it a promising precursor for applications such as lightweight battery, super capacitor and anti-corrosion of metals.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Xuyan Liu,Lian Xue,Youcai Lu,Yijie Xia,Qiang Li
The development of supercapacitor electrode material with high performance and low cost is a significant part of the research work. Herein, the polypyrrole (PPy)/Multi-walled carbon nanotubes (MWNTs) composites were synthesized by oxidative polymerization, when the iron (III) chloride (FeCl 3 ), methyl orange (MO), sodium dodecyl benzene sulfonate (SDBS) were used as the oxidant and dopant template. Various compounds of PPy and carbon nanotubes were synthesized, it shows a better capacity when the ratio of PPy and MWCNTs is up to 9:1.Under acidic conditions, the capacitance characteristics of the PPy/MWCNTs are better than other ones' when SDBS and MO are added, in other words, its ion exchange is more rapid and reversible. Electrochemical tests show that the initial discharge capacity of the PPy/MWCNTs composite electrode is 374.6 F/g. While the coulomb efficiency can remain 88% after 1000 discharge cycles, it indicates the good circulation stability of PPy/MWCNTs composite electrode material is obtained.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Guo-Qing Liu,Qing Hou,Xiao-Xiang Fan,Qing-Yi Zheng,Jeng-Kuei Chang,Jing-Min Fan,Ru-Ming Yuan,Ming-Sen Zheng,Quan-Feng Dong
Sluggish multiphase reaction kinetics and severe shuttle effect of lithium polysulfides (LiPSs) are two major challenges facing lithium–sulfur (Li–S) batteries, which largely prevent them from becoming a reality. Herein, a shell with catalytic function for sulfur cathode is in situ constructed through an ingenious electrochemical oxidative polymerization strategy by introducing hexafluorocyclotriphosphazene (HFPN) as additives, which suppresses the shuttle effect and promotes efficient sulfur conversion. The shell with abundant heteroatoms effectively confines polysulfides to the cathode matrix by chemically interacting with them to eliminate capacity degradation. Moreover, the shell exhibits high catalytic activities, which turns Li2S(2) into an activated state and facilitates its dissociation. The functionalized shell substantially advances the performance of Li–S batteries, thanks to efficient lithium-ion transportation and abundant adsorption–catalytic sites. As a result, Li–S batteries demonstrate superb resistance to self-discharge, ultrastable cycle performance, and greatly enhanced rate capability. Impressively, the batteries show an ultralow capacity decay rate of 0.034% throughout 700 cycles at 2C. They deliver a capacity of 517 mAh g–1 even at a 4C rate, exhibiting relieved electrochemical polarization and excellent sulfur utilization. This work provides an ingenious strategy to construct adsorption–catalytic nets for next-generation Li–S batteries with enhanced lifespan and electrochemical performance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Xiaohui Li,Zehai Xu,Qin Meng,Yu Chen,Lushen Xu,Guoliang Zhang
In this study, we have developed a facile in -situ hydrothermal oxidative polymerization method to synthesize poly N,N(1,3-phenylene)dimethanimine/KH550-black talc (PNPD/KH550-BT) nanocomposites for efficient removal of lead (II) (Pb 2+ ) in wastewater. This method employed eco-friendly solvent, offered a simple and cost-effective preparation procedure and resulted in a nanocomposite complex that displayed exceptional resistance to dissolve in various organic solvents, simplifying the separation process. Through the hydrothermal oxidative polymerization process, polymerization was promoted to generate spherical flower-like structures, effectively improving the dispersion of polymers on black talc nanosheets. Substantial concentration of sturdy lead-complexing groups was created, including N–H, –C N, and –NH 2 , which heightened the attraction to Pb 2+ ions and maximized the effective utilization of lead binding sites. Compared with KH550-BT and PNPD, the adsorption performance of PNPD/KH550-BT composites on Pb 2+ was significantly enhanced, and the largest adsorption capacity of lead (II) on PNPD/KH550-BT nanocomposites reached 867.1 mg/g. Moreover, the prepared nanocomposites had satisfactory adsorption potential after undergoing 10 cycles, showing good stability during adsorption. This work not only provides a new strategy to control the microstructure of polymer-based composite adsorbent but also presents various promising functionalized nanocomposites based on different polymers and minerals for application in vast fields.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Renjie Wang,Hao Chen,Linyue Zhang,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
A novel approach for selective removal of phenolic contaminants and polyphenols recycling based on oxidative polymerization is explored, which is significantly different from conventional degradation processes. Plenty of bridging OH − and lattice oxygen are bound on CuO@CuCe y O 1+2y+x/2 -IE due to strong coordination between Ce and O, which induced formation of Cu(III) with high redox potential. Cu(III) could not only form outer-sphere complexation with peroxymonosulfate (PMS) for enhancement of O 2 •– production involving series of chain reactions, but also promote O 2 •– conversion to singlet oxygen ( 1 O 2 ). Owing to electrophilicity, 1 O 2 preferentially attacked the phenolic hydroxyl group with the production of phenoxeniums ions, and phenoxide ions could immediately couple with negatively charged hydroxyl groups of other bisphenol A (BPA) molecular so as to make polymer chains get a sustained growth over CuO@CuCe y O 1+2y+x/2 -IE. Thus, CuO@CuCe y O 1+2y+x/2 -IE can selectively remove phenolic contaminants from water with low oxidant consumption, and simultaneously recycle more than 80 % of polyphenols. In summary, the present work demonstrated the predominant role and mechanism of 1 O 2 in triggering the oxidative polymerization of BPA, which contributed to construction of cost-efficient catalytic system for phenolic contaminants conversion into polyphenols.
研究领域:
环境科学
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催化化学
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污染控制
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 10
·100543
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IF 4.386
Xue-Mei Zhang,Chen Gao,Wilfred Emori,You-Bing Zuo,Yi-Qing Xia,Chi-Hui Tsou,Yin-Jie Peng,Rui-Ou Li,Yuan Tang,Rong Ran
In this work, we report for the first time, the direct chemical oxidative polymerization of melamine (MA) to obtain polymelamine (PME) via the initiation of a common oxidant, ammonium peroxydisulfate (APS). Characterizations of MA and PME were carried out by SEM, FTIR, XPS, NMR, and TGA measurements, and the results were compared with those from published works to verify the successful synthesis of PME. The PME was further used to initiate aniline (ANI) monomers, and an emeraldine product, called PAMx, was interestingly afforded. Moreover, APS oxidant was added into the solution as a second initiator for the polymerization of the residual monomers and remaining reactive sites on PAMx, thereby directly forming the hydrogel electrode, and labeled as PAMxS. The electrochemical performances of the PANI and PAMxS hydrogel supercapacitor electrodes were compared, and a high specific capacitance of 568 F g−1 at scan rate of 2 mV s−1 was obtained for PAM6S compared with 371 F g−1 for PANI. The facile direct oxidative synthesis approach for the preparation of PME provides an efficient route for its mass production, and its initiation ability with ANI monomers holds interesting potentials for the construction of macromolecules in conductive polymer applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Li Yue,Yin-Bo Yang,Na-Juan Yuan,Qing-Shuai Zhang,Yong Liu,Song-Hai Wu,Xu Han
Although the synthesis of low-molecular-weight poly(2,6-dimethyl-1,4-phenylene oxide) (LMW-PPO) has been widely studied, preparing metal-free LMW-PPO with high thermal stability and satisfactory dielectric properties is still challenging. In this study, a new method for synthesizing metal-free LMW-PPO by nonmetal catalysts has been developed. In the absence of Cu(II) catalysts, amines can catalyze benzoyl peroxide (BPO) to produce metal-free LMW-PPO in CH3CN (Mn in the range of 4.0 × 103–6.0 × 103), and N,N-dimethyl-p-toluidine (DMT) exhibits high reactivity in the yield of PPO (68.4%) with a low 3,3′,5,5′-tetramethyl-4,4’diphenoquinone (DPQ) yield (2.6 × 10–2%) and PDI (1.50). The low dielectric constant (Dk = 1.96) and low dielectric loss factor (Df = 1.57 × 10–3) of the obtained PPO indicate that amines are more appropriate for the synthesis of metal-free LMW-PPO with superior dielectric properties. Meanwhile, the Mn values of PPO can be successfully mediated by regulating the contents of the catalyst or mixing appropriate contents of toluene in CH3CN, and the decreased Tg values from 209.3 to 170.8 °C with decreasing Mn values from 1.7 × 104 to 4.1 × 103 indicate the improved processability of the LMW-PPO while maintaining high thermal stability (Td5% = 420.8–434.2 °C). Density functional theory (DFT) calculations further reveal the formation of oxidizing radicals from BPO by DMT, which then initiate H-abstraction from DMP to form the DMP radical. The produced DMP radicals then polymerize to LMW-PPO. This study provides new insight into synthesizing highly qualified LMW-PPO by metal-free catalysts.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Rongrong Wang,Xirong Huang
The hydrophobic ionic liquid [C8mim][PF6] (1-octyl-3-methylimidazolium hexafluorophosphate)-based bicontinuous microemulsion stabilized by the anionic surfactant [C4mim][AOT] (1-butyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate) was first tried as a medium for horseradish peroxidase (HRP)-triggered oxidative polymerization of aniline. The effects of the mass ratio of [C8mim][PF6]-to-water (α), the mass fraction of [C4mim][AOT] in the total mixture (γ), and temperature (T) on the enzymatic polymerization were investigated using UV–vis–NIR absorption, electron spin resonance, and small-angle X-ray scattering spectroscopy techniques. The bicontinuous microemulsion is demonstrated to play a template role in the biosynthesis of polyaniline (PANI). The conductivity of the resulting PANI depends on the microemulsion microstructure and the microstructure- and T-dependent catalytic properties of the solubilized HRP. With the increase in α, the conductivity of the synthesized PANI decreases due to the increase in the template curvature (decrease of the microdomain size) and the decrease in the activity and stability of HRP. Compared with α, γ has little effect on the microdomain size of the template; so, the γ-dependent change in the conductivity of PANI is mainly caused by the changes of the microstructure-dependent activity and stability of HRP. Over the range of 20–35 °C, T has little effect on the microdomain size, but it greatly changes the activity and stability of HRP. With the increase in T, the activity of HRP increases steadily, but its stability decreases significantly, which should be one of the reasons why the conductivity of PANI decreases with increasing T. In conclusion, lower values of α, γ, and T are favorable for the biosynthesis of conductive PANI. The present study not only deepens the insight into the role of the template in the process of PANI synthesis, but also opens up a green new way for the biosynthesis of the conducting polymer.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2021
·Vol. 12
·期 1
·58
·
IF 2.679
Yuefei Wang,Renjing Song,Li Li,Rongpeng Fu,Zhiguo Liu,Bingsheng Li
The authors report that polypyrrole (PPy) films with large area and high crystalline quality have been achieved using an interfacial chemical oxidation method. By dissolving different reactants in two immiscible solvents, the PPy is synthetized at the interface region of the two solutions. The PPy films have sharp XRD diffraction peaks, indicating that the molecular chains in the film are arranged in a high degree of order and that they reflect high crystalline quality. High crystal quality is also conducive to improving electrical conductivity. The conductivity of the as prepared PPy film is about 0.3 S/cm, and the carrier mobility is about 5 cm2/(Vs). In addition, the biggest advantage of this method is that the prepared PPy film has a large area and is easy to transfer to other substrates. This will confidently broaden the application of PPy in the future.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）