SN Applied Sciences
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2020
·Vol. 2
·期 4
·1-11
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IF 0
Yu Wenjie,Li Hengye,Zhang Lin,Liu Jing,Kong Fenying,Wang Wei
Abstract Adsorption is a promising technique for water treatment. Porous aromatic frameworks (PAFs) have been witnessed as advanced adsorbents for various applications and PAFs with task-specific functionality and porosity are desirable adsorbents. Herein, a charged PAF, PAF-CH 2 N(CH 3 ) 3 I, was prepared through precursor-designed method. The charged PAF is densely and homogeneously functionalized with cationic groups and featured with hierarchical pore structure. The content of the charged groups in the framework reaches up to 52.27 wt% and the hierarchical structure facilitates fast adsorption/desorption of dye molecular. It demonstrates strong affinity, fast adsorption rate, high adsorption efficiency and high adsorption capacity towards not only small model anionic dye but also large-sized one, which can not be adsorbed efficiently by other microporous adsorbents. In addition, benefiting from the hierarchical structure, the charged PAF can be easily regenerated and reused with almost no loss of its efficiency even after 10 adsorption–desorption cycles. These excellent features demonstrate that the charged PAF is a promising adsorbent for wastewater treatment and this study provides a new perspective to explore functionalized PAFs as a versatile type of advanced adsorbents. Graphic abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
Small
·
2024
·
IF 13
Zequan Huang,Danyi Zhu,Mingjie Ma,Bing Zhao,Jiazhen Liang,Liang Zhang,Chao Chen,Mengjiao Liu,Congjie Gao,Fei Huang,Lixin Xue
The degradation of fixed cationic groups in most anion exchange membranes (AEMs) under alkaline environments limits their durability for alkaline water electrolysis (AWE). Ion-solvating membranes (ISMs) have emerged as a promising alternative to address this issue. Herein, a cationic group-free ion solvating membrane in a free-standing gel form (ISM-PBI-FG) is presented, created through a sol-to-gel transformation process followed by KOH imbibing. This approach yields a 3D porous microstructure composed of entangled polybenzimidazole (PBI) nanofibrils, achieving 89% porosity, which enables ultrahigh alkali uptake (346% in 6 M KOH) and exceptional ionic conductivity (763 mS cm −1 at 80 °C). The absence of cationic groups avoids the attack by OH − , thus ensures good alkaline stability with a conductivity retention rate of 91.6% over a 3120 h ex situ test in 6 M KOH. The resulting membrane delivered outstanding AWE performance with current densities of 5.5 A cm −2 using platinum-group-metal (PGM) catalysts and 2.2 A cm −2 using PGM-free catalysts at 2.0 V. Notably, the in situ electrolyzer device based on ISM-PBI-FG offers extensive operational flexibility ranging from 40–100 °C and demonstrates record durability in concentrated alkaline conditions, with a voltage decay rate of only 23.5µV h −1 , outperforming most reported AEMs and ISMs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Huizhen Zheng,Meng Gao,Ying Ren,Ruyun Lou,Hongguo Xie,Weiting Yu,Xiudong Liu,Xiaojun Ma
The surface properties of implanted materials or devices play critical roles in modulating cell behavior. However, the surface properties usually affect cell behaviors synergetically so that it is still difficult to separately investigate the influence of a single property on cell behavior in practical applications. In this study, alginate–chitosan (AC) microcapsules with a dense or loose gel structure were fabricated to understand the effect of gel structure on cell behavior. Cells preferentially adhered and spread on the loose gel structure microcapsules rather than on the dense ones. The two types of microcapsules exhibited nearly identical surface positive charges, roughness, stiffness, and hydrophilicity; thus, the result suggested that the gel structure was the principal factor affecting cell behavior. X-ray photoelectron spectroscopy analyses demonstrated that the overall percentage of positively charged amino groups was similar on both microcapsules. The different gel structures led to different states and distributions of the positively charged amino groups of chitosan, so we conclude that the loose gel structure facilitated greater cell adhesion and spreading mainly because more protonated amino groups remained unbound and exposed on the surface of these microcapsules.
研究领域:
生物材料学
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细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Shikun Liang,Yunzhan Ying,Xiangwei Xu,Chengbo Qian,Long Jiang,Jing Zhou,Yulong Wan,Lie Wang,Yuyuan Yao
The widespread use of emerging refractory organic contaminants poses a significant threat to human health, prompting the need for a cost-effective and efficient removal strategy. While the iron ions/PMS system effectively removes organic pollutants, slow Fe3+ to Fe2+ transformation hampers its efficiency, and the homogeneous distribution of iron ions complicates separation, resulting in secondary sludge pollution. Herein, we developed a novel submicron Fe-MoS2 (S-Fe-MoS2) catalyst with abundant surface cationic groups and sulfur vacancy through a cationic polyacrylamide aerogels (CPAMA) confined hydrothermal synthesis strategy. These features promote active site exposure, enhance reactant adsorption, and accelerate electron transfer between Mo and Fe sites, improving catalytic kinetics and promoting Fe3+/Fe2+ cycle for PMS activation. As a result, the S-Fe-MoS2/PMS system exhibited a high catalytic rate constant (kobs) of 0.32 min−1, in the degradation of 4-chlorophenol (4-CP), 1.5 times higher than that of the conventional Fe-MoS2/PMS system. It also achieved 82.9% total organic carbon (TOC) degradation within 60 min. Additionally, it possessed similar degradation performance for various organic pollutants, along with remarkable reusability (four cycles) and broad pH adaptability (2–8), indicating significant potential for widespread application. This study provided a new way for developing advanced heterogeneous catalysts with high efficiency for water treatment.
研究领域:
环境科学
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催化材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Qiao Liu,Wenli Ma,Lin Tian,Junmin Li,Lincan Yang,Fanghui Wang,Zhiqian Wang,Jing Li,Zhongming Wang,Hong Zhu
To achieve high-performance anion exchange membranes (AEMs) with superior conductivity and stability, a series of novel poly(biphenyl piperidinium) (PBP-n-Pip) membranes are synthesized by tethering cationic groups to the backbone utilizing flexible hydrophobic alkyl spacers with various lengths. All of the membranes exhibit excellent film-forming ability and tensile strength (42.34–53.49 MPa). Well-defined microphase separation is confirmed by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The PBP-6-Pip membrane exhibits the conductivity of 117.1 mS cm −1 at 80 °C due to the most excellent microphase-separated morphology and highest water uptake. The long-term alkali resistance of AEMs can be improved by extending the length of the flexible alkyl chains appropriately. After immersion in 2 M NaOH at 80 °C for 1500 h, the initial conductivity of PBP-6-Pip with intermediate spacer chains and PBP-8-Pip with longer spacer chains both remains above 84%. Furthermore, the PBP-6-Pip membrane with the highest conductivity achieves a peak power density of 307 mW cm −2 at 80 °C in the H 2 /O 2 single fuel cell. A long-term life test of this MEA shows a voltage decay rate of 2.87 mV/h over 40 h of operation under 0.2 A cm −2 at 60 °C.
研究领域:
材料科学
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化学工程
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电化学
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BIOACTIVE AND COMPATIBLE POLYMERS
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2024
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IF 2.1
Zunyu Jiang,Rong Yang,Yang Sheng,Yixin Sun,Jian Li,Mark Bradley,Rong Zhang
With the increasing infection of drug-resistant bacteria, it has become a great challenge for researchers to find new approaches to eradicate drug-resistant bacteria and their biofilms. Photodynamic antimicrobial chemotherapy (PACT) is an indispensable part of the new anti-bacterial strategy because of its unique anti-bacterial mechanism, which can effectively inactivate drug-resistant bacteria without inducing further drug resistance. In this work, nanoparticles with N-isopropylacrylamide and methacryloxyethyltrimethyl ammonium chloride as monomers, and loaded with a fluorescent conjugated polymer were successfully prepared by microemulsion polymerization. The average particle size ranged from 100 to 200 nm. The nanoparticles could disperse in water steadily according to their zeta potential analysis. The nanoparticles generated singlet oxygen upon exposing to light with wavelength of 500–700 nm. Their PACT efficiency was investigated against Escherichia coli, Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus respectively. The results indicated that the antibacterial ability of nanparticles were excellent as the concentration was more than 0.01 mg/mL and the illumination time was 30 min. When the mass concentration of the nanoparticles was equal to or more than 0.05 mg/mL, the antibacterial mechanism was dominated by cation action, and when the concentration was equal or lower than 0.01 mg/mL, the antibacterial ability of the nanoparticles was improved effectively by photodynamic action. The antibacterial rate of the nanoparticle solutions against the bacteria in the biofilm was quantitatively studied, and it was proved that the nanoparticles eliminated bacteria in the biofilm effectively with a nanoparticle concentration of 0.2 mg/mL or more. The results indicated that the nanoparticles could effectively penetrate the biofilm to kill bacteria inside the biofilm by light illumination.
研究领域:
材料科学
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生物医学工程
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微生物学
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药学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）