JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shiyu Zhang,Runnan Zhang,Runlai Li,Zixuan Zhang,Yafei Li,Hao Deng,Junhui Zhao,Tianrun Gu,Mengying Long,Xiaoyao Wang,Sui Zhang,Zhongyi Jiang
Positively charged nanofiltration membranes hold great potential in Li + /Mg 2+ separation, but their application in alkaline solutions, such as alkaline salt-lake brines has not been reported. Herein, inspired by the arginine's unique structure and biological function, we explore superstrong basic triaminoguanidine (TG) molecule as aqueous monomer to fabricate positively charged polyamide nanofiltration membranes for Li + /Mg 2+ separation. With the Li + /Mg 2+ mass ratios of 1:50 and 1:120, at pH 9.6, the separation factors (S Li,Mg ) of membranes reach 31.8 and 20.9. Meanwhile, at pH 5.6, the S Li,Mg are 46.4 and 36.4, which are the ever-reported highest value and such high S Li,Mg can be well retained in the pH range of 5.6–8.6. The superior Li + /Mg 2+ selectivity stems from the superhigh protonation capacity of guanidine groups in a broad pH range.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·184-194
·
IF 5.693
Liang Ying,Xia Meng,Yu Qiuhan,Li Yongpeng,Sui Zhuyin,Yuan Yihui,Hu Xin-Ming,Chen Qi,Wang Ning
Uranium, which was abundant in the ocean but existed in the form of uranyl tricarbonate ([UO 2 (CO 3 ) 3 ] 4− ) with an extremely low concentration of 3.3 ppb, was a significant element of nuclear energy. It is of immediate significance to the research into uranium extraction by the exploration of adsorbents for environment and resource sustainability. Herein, the new ionic covalent organic frameworks (iCOFs) named COF-DG containing the guanidine groups was designed and synthesized via Schiff base reaction between diaminoguanidine hydrochloride and 1,3,5-triformylphloroglucinol. The adsorption performance indicated that the COF-DG possessed an uptake capacity of 65.6 mg g −1 toward the [UO 2 (CO 3 ) 3 ] 4− , attributed to the chemical interaction and anion exchange between [UO 2 (CO 3 ) 3 ] 4− and the cationic COF-DG with Cl − , as well as the electrostatic attraction. Besides, the COF-DG exhibited a higher affinity and selectivity toward [UO 2 (CO 3 ) 3 ] 4− in the presence of the competing anions. Furthermore, the COF-DG displayed an antibacterial rate of 82% against Gram-negative bacteria Escherichia coli owing to the guanidine groups. This work contributes new insights into the further development of iCOFs, for applying as a potential candidate in uranium extraction from seawater in practical engineering. Graphical abstract The new ionic covalent organic frameworks named COF-DG was designed and exploited via Schiff base reaction, which exhibited a higher affinity and selectivity toward the [UO 2 (CO 3 ) 3 ] 4− .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Bo Zhao,Runping Jia
Super-hydrophobic films are applied in various antifouling materials such as ship and car due to their extreme water resistance. Herein, we designed and fabricated superhydrophobic waterborne fluorinated polyurethanes films containing guanidine group (WFPUs films) via one-step spray method. It was found that the guanidine and carbonyl groups of WFPUs films rapidly cross-linked by hydrogen bonds obtaining the superhydrophobic WFPUs films with appropriate surface roughness. When the amount of guanidine salt chain extender reached 11%, the water contact angle (CA) and sliding angles (SA) of WFPU4 film were 153.82° and 4.2° ± 0.9°, respectively. The surface energy was also found as <10 mJ/m 2 . The Ra (surface roughness) value of WFPUs films reduced from 26.3 nm to 5.4 nm. Moreover, upon modified with guanidine group, superhydrophobic WFPU4 film performed the mechanical durability, and the hydrophobicity of cotton was effectively enhanced. And these super-hydrophobic films containing guanidine group have potential applications in the field of environmentally friendly coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 9
·1-5
·
IF 2.019
Wang Limei,Dou Liyan,Zhang Suobo
The hydroxide conductivity poly(aryl ether sulfone) with hexaalkyl guanidinium groups side chain(PES-G-Cl) was electrospun to bead-free nanofibers. The polymer concentration and environmental temperature are important parameters that influence the quality of electrospun fibers. We have synthesized the novel composite membranes composed of PES-G-Cl nanofibers and (vinylbenzyl) trimethylammonium chloride(VBTC) ionomers. As a result, the membrane stability, such as dimensions and thermal stabilities of the composite membrane was greatly improved and water uptake of the composite membrane also decreased when compared to that determined in the membrane without nanofibers. In addition, the hydroxide ion conductivity of the composite membrane indicated a significantly higher value when compared to that determined in the membrane with the conventional solvent-casting method. Consequently, nanofibers proved to be promising materials as a composite anion exchange membrane containing nanofibers may have potential application in fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 44
·24690-24700
·
IF 2.936
Yongqiang Gao,Lei Liang,Song Zhao,Yunlong Qi,Wen Zhang,Xuefei Sun,Zhi Wang,Jixiao Wang,Baodong Song
Physical blending is a common technique to improve the water flux and antifouling performance of ultrafiltration (UF) membranes. In the present work, a novel hydrophilic and antimicrobial core–shell nanoparticle was synthesized through the chemical grafting of poly(guanidine-hexamethylenediamine-PEI) (poly(GHPEI)) on the surface of silica nanoparticles (SNP). The synthesized core–shell nanoparticles, poly(GHPEI) functionalized silica nanoparticles (SNP@PG), were incorporated into polyethersulfone (PES) to fabricate hybrid UF membranes by a phase inversion process. The chemical composition, surface and cross section morphologies, hydrophilicity, water flux and protein rejection of the membranes were evaluated by a series of characterizations. Results show that the prepared PES/SNP@PG hybrid membrane exhibits not only improved water flux, which is around 2.6 times that of the pristine PES membrane, but also excellent resistance to organic fouling and biofouling.
研究领域:
材料科学
·
纳米技术
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膜技术
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）