ELECTROCHIMICA ACTA
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2017
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IF 4.798
Wei Jia,Beibei Tang,Peiyi Wu
It is of great necessity to achieve a proton exchange membrane (PEM) with high proton conductivity and low methanol permeability for the practical applications. Nafion modified carbon dots (NCDs) with multi-functional groups were successfully synthesized via the pyrolysis of citric acid (CA) with the existence of Nafion. The modification process is motivated by the hydrophilicity-to-hydrophobicity transformation of CA as well as the non-covalent hydrophilic-hydrophobic interaction during the pyrolysis procedure. Multi-functionalized NCDs with moderate hydrophilicity influence the aggregation structure of Nafion matrix of the composite membranes and effectively enhance the high-temperature water retention ability. Both the proton conductivity and the methanol resistance ability of the composite PEMs are significantly enhanced. 0.5-NCD-0.5 Nafion composite PEM presents a 5–10 times increase in proton conductivity and 50% percent decrease in methanol permeability than that of recast Nafion.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
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2018
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IF 1.666
Ying Zhang,Hongquan Yin,Qingshan Zhang,Yunzheng Li,Pengjun Yao,Hongyu Huo
Polyaspartic acid is a green biodegradable antiscalant and widely applied in water treatment field. However, its scale inhibition efficiency is not prominent, especially for calcium orthophosphate. So we introduced acylamino and hydroxyl groups simultaneously to prepare a novel polyaspartic-acid derivative (PASPTU) with multifunctional groups by the reaction of polysuccinimide with threonine and urea. The graft copolymer was analyzed by using nuclear magnetic resonance, gel permeation chromatography, thermogravimetric analyzer and Fourier transform infrared spectroscopy. Its scale inhibition performance for calcium orthophosphate, calcium sulfate and calcium carbonate was evaluated. The findings showed that the scale inhibition rates of the graft copolymer reached up to 100% for calcium orthophosphate, 100% for calcium sulfate and 91% for calcium carbonate at certain dosages. The findings above showed that the copolymer had excellent scale inhibition efficiency for calcium salts in water treatment processes.
研究领域:
材料科学
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水处理技术
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环境工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Wenjuan Chen,Hongzhu Ma,Baoshan Xing
Electrospinning of cellulose acetate with appropriated solvent system is the most straightforward method for fabricating micro- and nanofibers. To simultaneously and effectively remove both cationic and anionic dyes, a novel cost-effective multifunctional cellulose acetate (CA) fibers membrane was prepared by electrospinning followed by deacetylation , carboxymethylation and polydopamine (PDA) coating. The adsorption properties of PDA@DCA-COOH membrane were evaluated with methylene blue (MB) and Congo red (CR) as the ionic representatives for their removal. The results indicated that carboxyl, hydroxyl and amine multifunctional groups had been successfully grafted on the surface of the nanofibers with the maximum adsorption capacities of 69.89 and 67.31 mg g −1 for MB and CR, respectively, in the individual systems. The effect of co-existed dyes, inorganic salts and surfactants on the uptake of MB and CR in the simulated real complex system was strongly depended on the initial pH and ionic strength of the solution. The excellent adsorption capacities of the composite membrane were due to strong electrostatic attraction through the abundant functional groups on PDA@DCA-COOH surface. Based on its excellent recycling performance and adsorption property, PDA@DCA-COOH has a promising potential as an effective adsorbent in water treatment.
研究领域:
材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Songlin Fan,Zhihan Liu,Yixiao Wu,Yanjuan Zhang,Huayu Hu,Zuqiang Huang,Yuben Qin,Jing Liang
Herein, an effective adsorbent, 3D porous tubular network-structured citric acid-chitosan/Fe/polyethyleneimine beads (CCFPB) with multifunctional active groups and strong selectivity, was prepared for the selective removal of Cu 2+ from simulated wastewater. Compared with pure chitosan beads (CB), the adsorption capacity of CCFPB for Cu 2+ was increased by 127 mg g −1 (238%), and the adsorption equilibrium time was shortened by 480 min. The CCFPB showed porous surface and a novel 3D porous tubular network structure in interior, which were benefit to the diffusion of Cu 2+ from surface to interior of the CCFPB and the shortening of adsorption equilibrium time. The common coexisting ions in the simulated wastewater had almost no effect on the adsorption of Cu 2+ by CCFPB, and the adsorption was fast and reached equilibrium within 10 h. The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm model ( q m = 240.9 mg g −1 for Cu 2+ ). The adsorption mechanism of CCFPB for Cu 2+ was mainly the synergistic interaction with amino, carboxyl, and hydroxyl groups. This strategy shows great potential for developing a variety of novel, highly active, and reusable immobilized functional beads materials for effective separation of Cu 2+ from multi-ion wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
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2025
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IF 4.5
Bowen Guan,Mengru Wang,Liuxi Chen,Ran Wei,Hongqin Liu,Baocai Xu
Four novel quaternary ammonium surfactants containing ethoxy, amide and organic counterions were synthesized using glycolic acid ethoxylate oleylether, N , N -dimethylethylenediamine, dimethyl carbonate and carboxylic acids as raw materials and characterized with the aid of 1 H NMR, 13 C NMR and FTIR spectroscopy. The results indicated that their Krafft temperature was below 0 °C. Thermogravimetric analysis revealed that all four surfactants were highly thermally stable with T start of 323.65–359.65 °C and T onset of 390.29–394.65 °C. The results also showed that the surfactants had excellent surface activity with the critical micelle concentration of 2.70 × 10 −6 ∼ 4.61 × 10 −5 mol·L −1 and the corresponding surface tension of 31.03–34.09 mN·m −1 , and self-assemble spontaneously into the rod-like micelles at lower concentrations. Furthermore, according to the relationship between the relative growth rate of cells and the grade of cytotoxicity in the XXII Pharmacopoeia of the United States, the cytotoxicity grade of the four surfactants on L929 cells was 0 or 1, suggesting noncytotoxicity.
研究领域:
表面化学
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胶体与界面科学
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生物材料
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药物递送
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毒理学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Deshuai Zhen,Chunlin Liu,Qiuhui Deng,Le Li,Craig A. Grimes,Shengyuan Yang,Qingyun Cai,Yu Liu
Monitoring and purification of uranium contamination are of great importance for the rational utilization of uranium resources and maintaining the environment. In this work, an olefin-linked covalent organic framework (GC-TFPB) and its amidoxime-modified product (GC-TFPB-AO) are synthesized with 3-cyano-4,6-dimethyl-2-hydroxypyridine (GC) and 1,3,5-tris(4-formylphenyl) benzene (TFPB) by Knoevenagel condensation. GC-TFPB-AO results in specificity for rapid fluorescent/smartphone uranyl ion (UO22+) detection based on the synergistic effect of multifunctional groups (amidoxime, pyridine, and hydroxyl groups). GC-TFPB-AO features a rapid and highly sensitive detection and adsorption of UO22+ with a detection limit of 21.25 nM. In addition, it has a good recovery (100–111%) for fluorescence detection in real samples, demonstrating an excellent potential of predesigned olefin-linked fluorescent COFs in nuclear contaminated wastewater detection and removal.
研究领域:
材料科学
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环境科学
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放射化学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2023
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IF 8.8
Linna Guo,Miao Tian,Zhi Li,Qianqian Wang,Qiuhua Wu,Lin Hao,Chun Wang
Wide use of phenylurea herbicide has caused serious residue problem and threaten human health. It is important to develop viable method for their sensitive determination. Herein, a multi-functionalized porous polymer was prepared by crosslinking hexafluorobisphenol A with pyromellitic dianhydride. Using the multi-functionalized porous polymer as solid phase extraction sorbent, combined with high performance liquid chromatography, a sensitive method was established for determining phenylurea herbicides in beverages and celtuces. High sensitivity was achieved, with method detection limit (S/N = 3) of 0.01–––0.025 ng mL −1 for beverages, 1.70 ng g −1 for celtuce, and quantitation limits of 0.03–––0.10 ng mL −1 for beverages, 5.00 ng g −1 for celtuce. The method recoveries were 80.5–––120.0 % with relative standard deviations lower than 6.1%. Adsorption mechanism mainly involved F-π, F-O, π-π, polar interactions and hydrogen-bonding interactions. This study offers a simple protocol to develop multi-functional sorbents for extraction of organic pollutants.
研究领域:
环境科学
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分析化学
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食品安全
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Huiyi Yang,Guodong Liu,Cong Lu,Yudong Zheng,Xiangbo Xu,Jianming Zhao,Junfei Li,Yajie Xie,Ziyuan Fang
Endometrial injury can cause inflammation, leading to endometrial cell growth restriction, accompanied by fibrous tissue hyperplasia and adhesion in severe cases. Traditional treatments have problems such as high adherence rate, immunogenicity and intimal fibrosis. To solve the above problems, a multifunctional group mediated double cross-linked polysaccharide complex hydrogel was designed. Multiple groups were introduced into the hydrogel system by self-polymerization and amidation, and multi-network SA/PDA/CMCS-Arg injectable hydrogel was formed by non-toxic ion triggering system. The microenvironment can be regulated through the triple regulation of fibrinogen capture, active oxygen scavenging and bacteriostasis mediated by multifunctional groups in the inflammatory environment, so as to reduce the degree of tissue fibrosis and inflammatory reaction, and realize the repair of endometrial tissue. The effect of hydrogel on repairing endometrium was verified through Mouse endometrial injury model in vivo. The experimental results showed the composite hydrogel has a more suitable structure and performance for endometrial repair. After 7 days of hydrogel treatment, the matrix, epithelium, and glands of the damaged endometrium recovered well, and the degree of fibrosis was much lower than that of the control group. These results indicate that SA/PDA/CMCS-Arg injectable hydrogel has the potential to be an alternative material for endometrial repair.
研究领域:
生物医学工程
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组织工程
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材料科学
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生殖医学
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产品关联
DOI
高影响因子
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