MOLECULES
·
2023
·Vol. 28
·期 7
·2897
·
IF 4.6
Ying Leng,Kai Jin,Tian Wang,Xiaoyong Lai,Hui Sun
Lead (II) (Pb(II)) is widespread in water and very harmful to creatures, and the efficient removal of it is still challenging. Therefore, we prepared a novel sponge-like polymer-based absorbent (poly(amic acid), PAA sponge) with a highly porous structure using a straightforward polymer self-assembly strategy for the efficient removal of Pb(II). In this study, the effects of the pH, dosage, adsorption time and concentration of Pb(II) on the adsorption behavior of the PAA sponge are investigated, revealing a rapid adsorption process with a removal efficiency up to 89.0% in 2 min. Based on the adsorption thermodynamics, the adsorption capacity increases with the concentration of Pb(II), reaching a maximum adsorption capacity of 609.7 mg g−1according to the Langmuir simulation fitting. Furthermore, the PAA sponge can be efficiently recycled and the removal efficiency of Pb(II) is still as high as 93% after five adsorption–desorption cycles. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses reveal that the efficient adsorption of Pb(II) by the PAA sponge is mainly due to the strong interaction between nitrogen-containing functional groups and Pb(II), and the coordination of oxygen atoms is also involved. Overall, we propose a polymer self-assembly strategy to easily prepare a PAA sponge for the efficient removal of Pb(II) from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Kaizhen Wang,Shuhao Wang,Kaifeng Gu,Wentao Yan,Yong Zhou,Congjie Gao
Polyamic acid (PAA) is a flexible polymer and has abundant valuable hydrophilic groups. Herein, we developed an ultra-low pressure ultrafiltration (UF) membrane by integrating PAA into the polyethersulfone (PES) matrix via the “in-situ polycondensation” method. PAA was well compatible with PES and distributed uniformly in the membrane. The introduction of PAA improved membrane hydrophilicity. Meanwhile, the membrane pore structures were also refined. The membrane exhibited an excellent permeability under ultra-low pressure due to its improvement of hydrophilicity and pore structures. Under 0.3 bar, compare with the water flux of PES membrane, PES/PAA membrane improved nearly 2 times (571.05 L/(m 2 ·h)), with a high BSA rejection (≥90%). Even under a lower pressure, 0.1 bar, >300 L/(m 2 ·h) still can be achieved. Interestingly, the membrane we developed could maintain a high performance after drying, and then is very suitable for dry preservation. PES/PAA membrane showed a high oil removal (≥92%) and could remove oil from water effectively. Besides, the membrane exhibited excellent anti-oil-fouling properties. The flux recovery rate of PES/PAA (70.0%) far exceeds that of PES (37.9%) after three filtration and cleaning cycles. The membrane we developed is very valuable in oily wastewater treatment .
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Haoran Zhou,Shuai Zheng,Changwei Liu,Chunyan Qu,Yiying Wang,Wanbao Xiao,Hongfeng Li,Daoxiang Zhao,Jiaying Chang
Herein, we report an easy-to-prepare polyamic acid salt (PAAS) hydrogel with multiple functionalities including rapid self-healing, stimuli-responsive properties, and conductivity. This study describes a method for synthesizing PAAS hydrogel in aqueous solution. Phenylenediamine and 3,3′,4,4′-biphenyltetracarboxylic dianhydride were used to prepare a hydrogel with a fully aromatic backbone via gradual polymerization. It is possible to use the gel in the field of biomaterials in the absence of organic solvents. The prepared hydrogel was characterized using Fourier-transform infrared spectroscopy and dynamic rheometry. The gel has good toughness and the storage modulus and tensile stress are, respectively, about 0.25 and 0.45 MPa. Our study may pave the way for the manufacture of PAAS hydrogel, which may promote the development of hydrogel materials.
研究领域:
材料科学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Hui Sun,Jinhui Jiang,Yufen Xiao,Jianzhong Du
It is an important challenge to effectively remove environmental pollutants such as polycyclic aromatic hydrocarbons (PAHs), dyes, and heavy metal ions at a low cost. Herein, we present a multifunctional homopolymer vesicle self-assembled from a scalable homopolymer, poly(amic acid) (PAA), at room temperature. The vesicle can efficiently eliminate PAHs, cationic dyes, and heavy metal ions from water based on π–π stacking, hydrophobic effect, and electrostatic interactions with the pollutants. The residual concentrations of PAHs, cationic dyes, and heavy metal ions (such as Ni2+) in water are lower than 0.60 and 0.30 parts per billion (ppb) and 0.095 parts per million (ppm), respectively, representing a promising adsorbent for water remediation. Furthermore, precious metal ions such as Ag+ can be recovered into silver nanoparticles by in situ reduction on the membrane of PAA vesicles to form a silver nanoparticle/vesicle composite (Ag@vesicle) that can effectively catalyze the reduction of toxic pollutants such as aromatic nitro-compounds and be recycled for more than ten times.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Qiang Zhang,Fengying Zhang,Meng Zhang,Yuxiu Yu,Shuxia Yuan,Yaodong Liu
Silicon (Si) exhibits an excellent specific capacity and emerging application potential as anode material of lithium-ion batteries. However, Si anodes usually generate the huge volume expansion and the instability of the solid electrolyte interface, leading to performance degradation. Herein, a silicone-modified partially imidized polyamide acid (S-PA) is successfully synthesized, which shows excellent performances as the binder of a silicon-based electrode in lithium-ion batteries. The S-PA anodes exhibit high initial Coulombic efficiencies of above 87% and maintain over 98% in the following cyclic tests. At a current of 0.5 C, the initial discharge capacity of the S-PA-based electrode is as high as 2736 mAh g–1 and remains at about 2295 mAh g–1 over 200 cycles. The abundant chemical bonds in the S-PA binder contribute to the improvement of the interactions with silicon nanoparticles, maintain the electrode structural integrity, and facilitate the Li-ion diffusion during cycling. The results show that S-PA is a promising type of binder for silicon-based anodes as compared with commonly adopted PAA and PVDF.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Guozhen Li,Shiqi Ling,Yuhui Cui,Shilong Dong,Tianyin Liu,Ting Li,Siyu Pang,Peiyong Qin
Zeolitic imidazolate framework-8 (ZIF-8) is a typical filler used to fabricate mixed matrix membranes (MMMs) on account of its attractive advantage of high selective permeability for gas separation. However, the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers, However, the performance is usually affected by filler aggregation due to strong interactions among fillers and weak interactions between the polymer and fillers, which will lead to a decrease of selectivity and the performance of gas separation will be strongly influenced. Herein, we modified ZIF-8 with 3-amino-1,2,4-triazole to obtain ZIF-8-NH 2 , Kapton polyamide acid was selected as the polymer matrix. Results showed that the ZIF-8-NH 2 /Kapton MMMs has a good compatibility interface between ZIF-8 and Kapton because of the covalent bridging, even the filler loading up to 45% (mass). The 45% (mass) of ZIF-8-NH 2 /Kapton membrane showed 297 barrer (1 barrer = 10 −10 cm 3 ·cm·cm −2 ·s –1 ·cmHg –1 , 1 cmHg = 1333.22 Pa, standard temperature and pressure) of the permeability of H 2 and 43.9 and 62.2 of selectivities for H 2 /N 2 and for H 2 /CH 4 , respectively, which are beyond the upper limit of Robeson 2008.
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
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Zhe Wang,Zhongyu Wu,Yufeng Zhang,Jianqiang Meng
The development of efficient adsorbents with high sorption capacity remains as a challenge for the removal of micropollutants occurred globally in water resources. In this work, poly (amic acid) (PAA) electrospun nanofiber membranes grafted with hyperbranched polyols were synthesized and used for boron removal. The PAA nanofiber was reacted with hyperbranched polyethylenimine (HPEI) and further with glycidol to introduce the vicinal hydroxyl groups. The chemical composition and surface characteristics of the obtained PAA-g-PG membranes were evaluated by FESEM, FTIR, XPS and water contact angles (WCA) measurements. The boron adsorption thermodynamics and kinetics were investigated systematically. The results showed that the PAA nanofiber spun from concentration of 15% had uniform morphology and narrow diameter distribution. The PAA-g-PG nanofiber membrane had a maximum boron uptake of 5.68 mmol/g and could adsorb 0.82 mmol/g boron from a 5 mg/L solution in 15 min. Both the high surface area of nanofibers and the hyperbranched structure should contribute to the high boron uptake and high adsorption rate. The nanofiber membrane obeyed the Langmuir adsorption model and the pseudo-first-order kinetic model. The regeneration efficiency of the nanofiber membrane remained 93.9% after 10 cycled uses, indicating good regenerability of the membrane.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53103
·
IF 3.057
Hao Xing,Yanyu Mao,Yang Yang,Chunyan Qu,Dezhi Wang,Xupeng Fan,Liwei Zhao,Dongpeng Zhou,Changwei Liu
In response to the theme of environmental protection and green development in the world in the recent years, waterborne epoxy resin has received more and more attention. Waterborne epoxy resin has lower toxicity, but its low toughness limits the application range of waterborne epoxy resin. Here, we first proposed a method of toughening waterborne epoxy resin with aqueous polyamide salt solution. In this article, a series of waterborne polyamic acid salts is used as modification polymer to improve the high-temperature resistance and other properties of waterborne epoxy resins by copolymerization modification. Waterborne polyamic acid salt is dispersed uniformly in the epoxy resin. After curing, by compared with the pure epoxy resin, a semi-interpenetrating network is formed, the cross-linking density and the high-temperature resistance of the material are increased, and the glass transition temperature increases from 105°C to 116°C. The storage modulus at 300°C increases from 6.15 to 15.76 MPa. Thermogravimetric Analysis results reveal that the corresponding temperatures of 5% and 10% weight loss increase from 403°C and 419°C to 415°C and 435°C, respectively. At the same time, the toughness of the imide chain segment and polar groups lead to the improved adhesion of the epoxy system, the peeling strength increase from 0.51 to 1.24 N cm −1 , and the lap shear strength at high temperature (100°C) increase from 0.58 to 16.97 MPa. The water absorption decreases from 1.51% to 0.66%. The developed waterborne epoxy resin is expected to be used as a high-temperature waterborne epoxy coating in high-temperature coatings and other applications.
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
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 30
·14364-14373
·
IF 3.3
Zhiming Mi,Lingjun Meng,Junman Wang,Lintao Liao,Yangyang Huang,Kaiyang Zhang,Jingling Xiao,Tongtong Xie,Yuhang Yan,Yiping Zhong,Zhixiao Liu
Purification of nuclear wastewater is urgently needed due to the radioactivity and toxicity of uranium. In this work, a novel modified polyamide acid membrane adsorbent (GPAA) was facilely fabricated via a Schiff base reaction between glutaraldehyde and an amino terminated polyamide acid oligomer (NPAA), followed by nonsolvent induced phase separation (NIPS) treatment at room temperature. The resultant GPAA membrane has a hydrophilic surface and a porous structure with a low water contact angle of 29°, and the GPAA membrane exhibited a high surface area of 105 m2 g−1 with a multi-scale mesoporous feature. Fast uranium adsorption dynamics of the GPAA membrane were observed with adsorption equilibrium at 16 h at 20 ppm uranium initial concentration. The maximum uranium adsorption capacity was found to be 413 mg g−1 with the chemisorption dominating the uranium enrichment process. Importantly, the resultant GPAA membrane demonstrated an ultrahigh uranium uptake of 350 mg g−1 in acidic aqueous solution (pH = 4), ascribing to the hydrophilic carboxyl and the low isoelectric point membrane surface. Meanwhile, the GPAA membrane manifested excellent acid and salt resistance and good selectivity towards common interfering ions. Furthermore, no apparent structural destruction was observed on the membrane after a three-cycle adsorption–desorption practice. Consequently, the sample preparation techniques and the outstanding adsorption performance made the GPAA membrane an ideal adsorbent candidate for uranium enrichment and separation, especially in acidic wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Tianxiang Jin,Bin Huang,Jie Huang,Feiqiang He,Zhirong Liu,Yong Qian
Poly(amic-acid) modified single-walled carbon nanohorns (PAA/SWCNH-COOH) contained dual-functional groups (amide and carboxyl) were synthesized by in-situ polymerization and used for the elimination of uranium (VI). It was found that the adsorption capacity of SWCNH-COOH increased significantly after grafting PAA chains, and the theoretical monolayer adsorption capacity of PAA/SWCNH-COOH could reach 216.0 mg/g. The adsorption capacity of this material could remain up to 90% of the initial value after 5 times of reuse. Moreover, PAA/SWCNH-COOH has an excellent adsorption selectivity , which could be attributed to the synergistic adsorption effects between amide and carboxyl groups. To further study the interaction mechanism between uranium ions and the adsorbents, the quantum chemical calculations were performed using DFT method. The simulation results show that both amide and carboxyl groups have a strong interaction with uranium ions, which ensures the high adsorption capacity of this material. This research proved that the PAA/SWCNH-COOH is a promising adsorption material for removing uranium from wastewater and it also sheds a light on the interaction mechanism between bifunctional adsorbents and uranium ions.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhen Huang,Yitong Xin,Jiulin Shen,Lan Shen,Junfeng Liu,Xiping Zeng,Huan Ling,Guoli Tu,Hui Yang,Daping He,Bin Hu
Optically transparent electromagnetic interference (OTEMI) shielding materials are garnering significant attention due to their dual capabilities of providing electromagnetic interference (EMI) shielding while maintaining optical transparency. Beyond high shielding efficiency, the materials also require lightweight, ultra-thinness, flexibility, and reliability for extreme conditions applications like industrial and aerospace scenarios, which challenges most existing EMI shielding materials. Herein, we utilize the openings in the percolating silver nanowires network to realize the interpenetrating crosslink of polyamide acid, which enables the in-situ, damage-free encapsulation of the vulnerable conductive network and forms a lightweight OTEMI shielding film with exceptional stability. The 8 μm EMI shielding films show 29–46 dB shielding effectiveness in the 12–18 GHz range, with variable visible light transmittance (45 %-86 %@550 nm), while being capable of withstanding a broad temperature variation from 220 °C to − 170 °C. Moreover, the solution-processed film possesses excellent bending stability and chemical corrosion resistance, showing its unique applications in harsh conditions inaccessible to humans.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
Y. Zhang,Y. Li,X. Jia,E.B. Berda,C. Wang,D. Chao
The electrochromic/electrofluorochromic (EC/EFC) dual-functional polymers have gained intense attention owing to the unique electrochemically induced absorption and emission change simultaneously. Most of the efforts have recently been devoted to improving their EC/EFC performance. However, the practical application studies of the EC/EFC polymers are still in their infancy. Herein, we present a poly(amic acid) based material bearing high solid fluorescence-efficiency AIEgens and electroactive oligoaniline groups, featuring a good electrochromic performance with desirable optical contrast, high coloration efficiency, and outstanding durability. This occurs in tandem with electrofluorochromic behavior with ideal fluorescence contrast and moderate switching speed. By virtue of the versatile electrospinning technique, we manufactured a nanofibrous test strip base on the resultant polymer for glucose determination. The colorimetric/fluorometric dual-determination of glucose is carried out with an obvious color change from gray to dark green, along with a drastic fluorescence change from light to dark, which exhibits numerous advantages of easy operation, rapid detection, favorable selectivity, and unique repeated use feature. Furthermore, the nanofibrous test strips also provide reliable results in the glycosuria test. This strategy shows distinct promise for future sensing applications.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）