RSC Advances
·
2015
·Vol. 5
·期 108
·88646-88654
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IF 3.84
Jianqiang Guo,Guohu Guan,Wen Zhou,Chuncheng Li,Yaonan Xiao,Wenxiang Zhu,Liuchun Zheng
Zwitterion-coated reduced graphene oxide (rGO) was used in fabricating graphene/PBO composite fibers via in situ polymerization. The zwitterionic 1 : 1 adducts were formed by two monomers of PBO and they could be crystallized using rGO sheets as templates. Covalent bonds could be formed between GO and 4,6-diaminoresorcinol dihydrochloride (DAR·2HCl, a monomer for PBO) with GO being reduced simultaneously at room temperature. The structure of rGO sheets was well characterized and a mechanism including nucleophilic addition and E1 dehydration was proposed. Zwitterions could precipitate out from water rapidly and yet dissolve in PPA easily. Thereby, rGO sheets could be homogeneously dispersed in the PBO matrix as zwitterions dissolve and polymerize. By adjusting the feeding of zwitterion-coated rGO sheets, various composites with 0.1–3.0 wt% GO sheets incorporated were obtained. With very low rGO sheet content, both the mechanical properties and thermal stability of rGO/PBO fibers increased remarkably.
研究领域:
材料科学
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高分子化学
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纳米复合材料
·
先进纤维
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DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Huiju Shao,Yanfang Diao,Fangfang Zhang,Shuhao Qin
Membrane separation has been demonstrated to have enormous potential for alleviating the global scarcity of clean water. However, membrane fouling extremely limits its applications, and on-demand and precise molecular separation is very challenging for traditional membranes. Here, a novel smart voltage-gated membrane with an analogous zwitterion-functionalized separation layer is prepared by combining blending, surface segregation and co-deposition. Intriguingly, amphiphilic sodium styrene-maleic anhydride copolymer (SMANa) anchored on CNTs not only promotes their dispersion in the membrane but also enhances the electroconductivity through the synergistic ionic-electronic conducting effect. More importantly, positively and negatively charged molecular chains mounted on the membrane surface could form different “electric double” layers in response to the voltage stimuli. Consequently, the optimized membrane as the cathode exhibits superior permeations and separations of Congo red (99.9 %, 313.6 L/m 2 ·h·bar) and indigo carmine (96.9 %, 420 L/m 2 ·h·bar), and as the anode displays outstanding permeations and separations of methyl green (98 %, 381.6 L/m 2 ·h·bar), crystal violet (95.7 %, 368.2 L/m 2 ·h·bar) and methyl orange (94.6 %, 166.4 L/m 2 ·h·bar) due to the effective combination of size sieving, electro-enhanced electrostatic repulsion and adsorption-induced electrostatic repulsion effects. Simultaneously, high flux recovery ratios are also achieved due to the superposition of a stable hydration layer and electrochemistry , indicating excellent antifouling properties.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Jia Yang,Xitong Sun,Qian Li,Lin Cheng,Ruihao Wang,Xiyan Sun,Liaoyuan An,Weihong Chen,Li Wei,Qingda An
A multifunction-integrated adsorbent based on zwitterion functionalized cellulose (MCC@PGMA-IAA) was synthesized by surface grafting polymerization and then modification with polyethyleneimine and sodium chloroacetate in turn. The adsorbent exhibited high functional group contents, switchable surface charge and chelating structure of iminoacetic acid. With the methylene blue , azophloxine, Ni(II) and Cr(VI) as the models of cationic/anionic dyes and heavy metal ions , batch experiments were conducted. The material showed strong adsorption abilities for dyes and heavy metal ions, with maximum adsorption capacities up to 440.5 mg/g, 320.5 mg/g, 59.3 mg/g, and 127.9 mg/g for methylene blue, azophloxine, Ni(II) and Cr(VI), respectively. Especially, the adsorption capacities of methylene blue and Ni(II) after zwitterionic functionalization increased by 50 times and 95.5% than those after polyethyleneimine modification. The adsorption equilibria were achieved within 10–120 min, and the adsorbent exhibited excellent removal efficiency. Furthermore, the adsorbed pollutants were conveniently desorbed by low concentration of HCl or NaOH solution, and the adsorbent had good reusability. Mechanism studies proved that electrostatic attraction and chelation were main driving forces. These results showed that MCC@PGMA-IAA had the characteristics of extensive sources, simple preparation and multifunctional integration, which was poised to develop as universal adsorbent for removing heavy metal ions and dyes.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 34
·48995
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IF 2.52
Wenjing Diao,Linlin Wu,Xiaofeng Ma,Lei Wang,Ximan Bu,Wei Ni,Xinfeng Yang,Ying Fang
It remains challenging to develop stretchable and self-healable polymer electrolytes with improved ion-conductive nature for high-performance multifunctional flexible supercapacitors. Herein, a P(AM-SBMA-AMPS)-SiO 2 zwitterion-containing polyelectrolyte hydrogel is fabricated via copolymerization of acrylamide (AM), sulfobetaine methacrylate (SBMA) zwitterionic monomer, and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) anionic monomer grafted from the surface of vinyl silica nanoparticles (VSNPs). The hydrogen bonding among polymer chains and the high-density dynamic ionic interactions between SBMA and AMPS work as reversible “sacrificial bonds” to toughen hydrogel, while the VSNPs function as multifunctional crosslinkers and stress transfer centers, which makes these hydrogels tough (fracture energy 2.7 MJ m −3 ), stretchable (fracture strain 4,016%), and self-healable (fracture strain of healable sample 775%). More importantly, this zwitterion-containing polyelectrolyte hydrogel exhibits high ionic conductivities (3.4 S m −1 ) owing to the highly hydration capacity of the zwitterionic polyelectrolyte copolymer which produced efficient ion migration channels for ion transport. Accordingly, a flexible supercapacitor based on this multifunctional hydrogel as electrolyte demonstrates a high electric double-layer capacitive capacitance of 60.6 F g −1 at 0.5 A g −1 and excellent capacitance retention of ~98% over 1,000 cycles as well as encouraging electrochemical properties at subzero temperature. This work provides new insights into the synthesis of highly conductive and multifunctional polyelectrolyte hydrogels for high-performance flexible supercapacitors. © 2020 Wiley Periodicals, Inc.
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高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Wei Luan,Chengyu Nie,Xianfu Chen,Zhenchen Tang,Minghui Qiu,Yiqun Fan
Ceramic membranes have been widely used in oil-water separation owing to their characteristics of high flux, excellent chemical stability, strong hydrophilicity, and good fouling resistance. To further enhance their anti-fouling performance, a co-deposition reaction was employed for the surface modification of the ceramic membranes in this study. Polyethyleneimine and dopamine were used to introduce tertiary amine groups on the surface of the ceramic membranes, and sodium 2-bromoethanesulfonate was used for the quaternization reaction with tertiary amine groups. According to the water contact angle measurements, the ceramic membrane functionalized via zwitterionic modification exhibited better hydrophilicity and thus could absorb water droplets faster than pristine ceramic membranes. Consequently, the zwitterion-functionalized ceramic membrane achieved double the permeance (40 L m −2 h −1 bar -1 ) compared to the original ceramic membrane (20 L m −2 h −1 bar -1 ) during the separation of the oil-in-water emulsion, suggesting good anti-fouling performance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 26
·11729-11740
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IF 2.7
Ying Liu,Ruotong Ru,Chengjun Ge,Linlin Zhang,Hongfei Sun
The marine biofouling of deep-sea exploration equipment has compromised its normal purpose of detecting marine resources, and conventional self-renewing hydrogel coatings have become unsuitable for precision instruments due to the release of antifouling agents or heavy metals. Zwitterions exhibit excellent antifouling ability due to the hydration layer formed by molecules with equal amounts of cationic and anionic groups, resulting in an overall neutral charge. Herein, a non-releasing, mechanically strong surface hydrogel coating suitable for deep-sea probes was successfully prepared based on sulfobetaine-tannic acid zwitterionic hydrogel coatings (PVATAZ), aiming to achieve high antifouling performance. Benefiting from the hydration layer generated by the zwitterion and the significant mechanical performance of strong hydrogen bonding between poly(vinyl alcohol) and tannic acid (TA), the resulting optimized PVATAZ hydrogel coatings exhibited excellent antifouling performance and high tensile strength. Specifically, under stress up to 0.41 MPa, elongations can reach up to 228% and the colony forming units of E. coli and S. aureus in PVATAZ are 0.08 and 0.05 per milliliter, respectively. The efficiency of zwitterion-containing hydrogel coatings in resisting marine fouling while being environmentally friendly renders them promising as hydrogel coatings for deep-sea probes.
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高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
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2022
·
IF 5.168
Xiaoli Ren,Ming Duan,Xiujun Wang,Qingqing Tang,Jian Zhang,Yan Xiong,Shenwen Fang
In this paper, a novel flocculant with the characteristics of both quaternary ammonium salt cation and dithiocarbamate anion was synthesized. Firstly, a cationic polymer having secondary amine side groups was synthesized by using cationic monomer and diallyl amine (DAA) as monomers via aqueous solution polymerization , and then the secondary amine was modified by carbon disulfide (CS 2 ) to prepare the zwitterion flocculant. By using the oil removal as index, the effects of cationic monomer type, monomer concentration, mass ratio of cationic monomer to DAA, initiator concentration, polymerization temperature and time on the copolymerization results were investigated. The recommended rational condition was as follows: cationic monomer was methacryloxyethyltrimethyl ammonium chloride (DMC), monomer concentration was 50 wt%, mass ratio of DMC:DAA = 4:1, initiator was ammonium persulfate (APS) and its concentration was 0.4 wt%, and polymerization temperature was 60 °C for 8 h. The zwitterion flocculant obtained at the recommended condition had a removal of 99.5% at the dosage of 300 mg/L for produced water obtained from an offshore oilfield. In addition, the flocculation mechanism of the zwitterion flocculant was studied. According to the results of zeta potential measurement and floc morphology, it can be found that the quaternary ammonium salt unit in the zwitterion flocculant can bridge and flocculate oil droplets by destroying the stability of oil droplets in produced water through electrostatic neutralization, while the dithiocarbamate unit can interact with Fe 2+ in produced water to form a network structure to catch flocculated oil droplets, and the synergistic effect of quaternary ammonium salt unit and dithiocarbamate unit is helpful for achieving the good flocculation result. The results provide a new selection for produced water treatment .
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高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2020
·Vol. 61
·期 1
·154-166
·
IF 1.917
Ximan Bu,Yongxin Ge,Lei Wang,Linlin Wu,Xiaofeng Ma,Duyou Lu
Nonvolatile deep eutectic solvent (DES) electrolytes with good electrochemical stability have recently emerged as promising electrolytes for energy storage devices. In this report, for the first time a polymerized zwitterionic molecule was introduced and a series of hybrid cross-linked zwitterion-containing copolymer DES gels are synthesized via UV initiated free-radical copolymerization of acrylic acid (AA), sulfobetaine vinylimidazole (VIPS) and poly(ethylene glycol) diacrylate (PEGDA) monomers, in situ within DES, which is prepared from 1:2 M ratio of choline chloride and ethylene glycol. Systematically varying the AA:VIPS molar ratio and copolymer contents within the copolymer network enables one to widely tune the mechanical properties and ionic conductivity of the poly(AA- co -VIPS) DES gels. The tensile strength of P(AA- co -VIPS) DES gels significantly increased from 28 kPa to 176 kPa with fracture strain from 720% to 1370%, while the ionic conductivity of copolymer DES gels remains high from 2.7 to 4.1 mS cm −1 with the increase of copolymer content from 25 wt % to 45 wt%. A copolymer DES gel not only enables a supercapacitor deliver high capacitance of 71.52 F g −1 at 0.5 A g −1 , and retains ∼97% of its capacitance after 2000 cycles, but also achieves outstanding capacitive performance over wide temperature range.
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高影响因子
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