JOURNAL OF POLYMER ENGINEERING
·
2023
·Vol. 43
·期 6
·556-566
·
IF 2
Wu-Shang Yang,Peng Zhang,Shu-Yang Shen,Qian-Wei Su,Ya-Ni Jiang,Jian-Li Wang,Ming-Yong Zhou,Ze-Lin Qiu,Bao-Ku Zhu
It is challenging to effectively purge wastewater containing heavy metal ions at low concentration. In order to remove trace Cr (VI) from wastewater efficiently, a positively charged microporous membrane was prepared by firstly non-solvent induced phase separation (NIPS) of amphiphilic polymer and secondly surface quaternization modification. The morphologies, surface roughness, surface charge, hydrophilicity, and pore size of membranes were characterized. Based on the dual action of micellar adsorption and charge repulsion, when surfactant is 4 mM and Cr (VI) is 60 ppm, the surface quaternization membrane (Q-MPVD) achieves 99.8 % Cr (VI) rejection simultaneously accompanied by a permeability of 100 LMH/bar. Meanwhile, the effects of STAC concentration, Cr (VI) concentration, pH as well as inorganic salt concentration on the composite micellar size, and Cr (VI) rejection performance were investigated, respectively. Moreover, the Q-MPVD membrane shows an excellent separation stability over a wide pH range, indicating its application perspective in engineering process. In summary, this work provided a positively charged membrane with high-efficiency performance for treating practical trace Cr (VI)-containing industrial wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 1
·80
·
IF 5.3
Xue Sun,Bolan Wu,Na Li,Bo Liu,Shijun Li,Liang Ma,Hangyu Zhang
Peptides can be designed to self-assemble into predefined supramolecular nanostructures, which are then employed as biomaterials in a range of applications, including tissue engineering, drug delivery, and vaccination. However, current self-assembling peptide (SAP) hydrogels exhibit inadequate self-healing capacities and necessitate the use of sophisticated printing apparatus, rendering them unsuitable for 3D printing under physiological conditions. Here, we report a precisely designed charged peptide, Z5, with the object of investigating the impact of electrostatic interactions on the self-assembly and the rheological properties of the resulting hydrogels. This peptide displays salt-triggered self-assembly resulting in the formation of a nanofiber network with a high β-sheet content. The peptide self-assembly and the hydrogel properties can be modified according to the ionic environment. It is noteworthy that the Z5 hydrogel in normal saline (NS) shows exceptional self-healing properties, demonstrating the ability to recover its initial strength in seconds after the removal of shear force, thus rendering it an acceptable material for printing. In contrast, the strong salt shielding effect and the ionic cross-linking of Z5 hydrogels in PBS result in the bundling of peptide nanofibers, which impedes the recovery of the initial strength post-destruction. Furthermore, incorporating materials with varied charging properties into Z5 hydrogels can alter the electrostatic interactions among peptide nanofibers, further modulating the rheological properties and the printability of SAP hydrogels.
研究领域:
生物材料学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Qing Cheng,Wulin Yang,Qingling Chen,Jiajun Zhu,Deyi Li,Licai Fu,Lingping Zhou
Maintaining a highly negative value of conduction band (CB) potential of photocatalysts through metal doping has been a great challenge. Herein, we investigated the effects of Fe-doping on the crystal structures and electronic structures of zirconia (ZrO 2 ) in detail by combining experiments and Density Functional Theory (DFT). It was revealed that the Fe-doping obviously triggered the formation of tetragonal phase ZrO 2 and induced a defect states in the bandgap of Fe-doped ZrO 2 . Due to the coherent effect between the electrons of the Fe 3 d orbitals and ZrO 2 intrinsic electronic states, the defect states expanded the light absorption edge of ZrO 2 and Fe-doped ZrO 2 showed a small bandgap with maintaining a highly negative value of the CB potential. Meanwhile, Fe-doping significantly enhanced photoelectrochemical properties, the efficiency separation of electron-hole pairs and photocatalytic activity in comparison with the pristine ZrO 2 . We also found that 0.5%Fe-ZrO 2 exhibited the optimum photocatalytic performance, and reached 96% for degradation of Rhodamine B (RhB) within 150 min under visible light irradiation. This work elucidated the mechanism of the photocatalytic degradation of RhB over Fe-doped ZrO 2 and provided a promising approach in designing highly negative CB potential of ZrO 2 via Fe doping toward sustainable environmental remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Chang Sun,Pengcheng Zhao,Yongqing Yang,Zhuo Li,Wenchao Sheng
The application of anion exchange membrane fuel cells is hampered by the development of highly efficient and earth-abundant anode hydrogen oxidation reaction (HOR) catalysts. Here, a series of nickel catalysts (denoted as Ni-X) with different lattice oxygen (LO) contents were synthesized by H2 reduction of nickel hydroxide at temperatures (X) ranging from 300 to 500 °C. The Ni-400 (LO/Ni = 0.41, NiO0.41) catalyst with an optimum LO content showed excellent HOR activity and stability, comparable to current Ni-based electrocatalysts. An X-ray photoemission spectroscopic study, combined with density functional theory calculations, suggested that introducing LO into Ni modified the metal d-band electronic structure and in turn the hydrogen binding energy, which played a major role in determining the HOR performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2014
·Vol. 37
·期 24
·3738-3744
·
IF 2.594
Jiliang Cao,Jinchao Wei,Ke Tian,Huanxing Su,Jianbo Wan,Peng Li
A capillary zone electrophoresis method was developed for the simultaneous determination of seven phenolic acids, including protocatechuic aldehyde ( 1 ), salvianolic acid C ( 2 ), rosmarinic acid ( 3 ), salvianolic acid A ( 4 ), danshensu ( 5 ), salvianolic acid B ( 6 ), and protocatechuic acid ( 7 ), in Danshen and related medicinal plants. A running buffer composed of 20 mM sodium tetraborate adjusted to pH 9.0, and containing 12 mM β-cyclodextrin as modifier. Baseline separation was achieved within 17 min running at the voltage of 20 kV, temperature of 25°C and detection wavelength of 280 nm. The relative standard deviations of migration time ranged from 0.2 to 0.7% and the peak area ranged from 1.5 to 3.7% for the seven analytes, indicating the good repeatability of the proposed method. The method was extensively validated by evaluating the linearity ( R 2 ≥ 0.9992), limits of detection (0.14–0.36 μg/mL), limits of quantification (0.47–1.19 μg/mL), and recovery (96.0–102.6%). Under the optimum conditions, samples of Danshen and related medicinal plants were analyzed using the developed method with high separation efficiency.
研究领域:
药物分析
·
植物化学
·
电泳技术
·
质量控制
·
天然产物研究
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yingxi Wang,Wenluan Zhang,Qiangqiang Sun,Shiji Lin,Sheng Sun,Xu Deng
Water droplets are usually charged positively via either electrospray or contact electrification at the solid/liquid interface. Herein, we describe a facile two-step strategy to generate charged droplets with desired polarities. In particular, negatively charged droplets can be generated via electrostatic induction using a precharged superamphiphobic substrate as an electret. The interplay of repulsive and attractive interactions between like- and unlike-charged droplets or electret leads to rapid droplet transport and self-assembly of specific highly ordered arrays.
研究领域:
材料科学
·
界面化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2012
·
IF 3.794
Lizhen Liu,Feng Feng,Shaomin Shuang,Yunfeng Bai,Martin M.F. Choi
A rapid and efficient capillary zone electrophoresis (CZE) method with ultraviolet detection has been successfully developed for the determination of puerarin in Xinkeshu capsules and biological samples. The optimal CZE conditions were determined to be 70 mM H 3 BO 3 –Na 2 B 4 O 7 , pH 9.2, injection time 5 s, applied voltage 25 kV, working temperature 25 °C and detection wavelength 254 nm. Under these conditions, a linear range from 17.3 to 138 μg/mL with the correlation coefficient of 0.9998 and limit of detection of 34.6 ng/mL ( S / N = 3) for puerarin were obtained. The relative standard deviation of the migration time and peak area of puerarin were 0.23–0.91, 0.43–1.62, 0.10–0.64 and 0.64–1.32% for intra-day and inter-day analyses, respectively. Satisfactory results were obtained for recovery and repeatability. The proposed method was successfully applied to analyze the puerarin content in Xinkeshu capsules and some biological samples with good results. It is suitable for applications in pharmaceutical industries for quality control and in clinical laboratories for therapeutic drug monitoring purposes.
研究领域:
药学分析
·
生物分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 11
·4602-4607
·
IF 1.821
MingHui Li,WenShen He,LiJun Zhang,ChengLi Duan
A capillary zone electrophoresis method was established for simultaneous analysis of penicillin G and penicillin acid in milk. Milk samples were deproteinized and the analytes were extracted with acetonitrile. Separation of target compounds was performed through electrophoresis. Under optimum conditions, the proposed method demonstrated good correlation coefficients (R > 0.9953), precision (<6.2%), accuracy (89.2–96.8%), and limits of detection and quantification of penicillin G and penicillin acid (LOD, 0.01 and 0.5 μg mL−1, LOQ, 0.04 to 1.7 μg mL−1, respectively). The proposed method for the determination of penicillin and penicillin acid in milk is rapid, convenient and low-cost, and can measure β-lactamase activity in milk. The thermal stabilities of penicillin G, penicillin acid, and β-lactamases in milk were satisfactory when the temperature was lower than 303 K. When the temperature was higher than 353 K for 5 h, β-lactamase tended to be inactivated completely. When the temperature was 373 K, penicillin G and penicillin acid were easily degraded.
研究领域:
分析化学
·
食品科学
·
微生物学
✓ 已验证
DOI
高影响因子
ELECTROPHORESIS
·
2020
·Vol. 42
·期 6
·719-724
·
IF 3.081
Evgeniya V. Polyakova,Olga V. Shuvaeva,Olga S. Koshcheeva,Yuliya E. Tyutereva,Ivan P. Pozdnyakov
Arsenic aromatic compounds including p-arsanylic acid (pASA) are still widely used in a number of countries as the feed additives in animal breeding resulting in its entering the environment. Under the influence of oxidizing agents or UV radiation, pASA undergoes transformations leading to generation of inorganic arsenic species that are more mobile and toxic than organic ones. On the one hand, an approach based on the treatment of contaminated waters by UV irradiation seems perspective for their detoxification, but the feasibility of this approach depends on the composition of the products forming as a result of photodegradation. In the present work, a CZE was applied for the study of the pASA degradation process during stationary (308 nm) photolysis in the presence of Fe(III)-oxalate complex. A developed assay allowed controlling the parent compounds and also As-containing products of pASA degradation, presented mainly by arsenate and arsenite ions. It was found that the main inorganic derivatives of the pASA photolytic conversions are presented by arsenate and arsenite ions whose ratio depends on the initial amount of pASA and reaction conditions.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 9
·7355-7363
·
IF 3.201
Yanhua Sun,Tao Ren,Zhiwei Deng,Yanjing Yang,Shian Zhong
In this study, we successfully synthesized bovine hemoglobin (BHb)-imprinted polymers based on the molecular imprinting technique and BHb-coated Janus hydroxyapatite nanoparticle (BCJHP)-stabilized Pickering emulsions. For the first time, Janus hydroxyapatite nanoparticles (J-HAp) were synthesized successfully by partial masking with ultrapure water and further coating with BHb and then, they were employed as Pickering-type interfacial stabilizers to prepare the Pickering emulsions. Moreover, the effect of electrostatic charge density on the recognition properties was explored in depth using 2,2-bis(hydroxymethyl)propionic acid as the cationic monomer and 2-acrylamide-2-methylpropanesulfonic acid as the anionic monomer. Rebinding experiments of BHb onto MIPs (molecularly imprinted polymers) and non-imprinted polymers (NIPs) in a PBS solution of BHb were studied using a batch method. The results indicated that charged monomers could be used to improve the adsorption capacity, but they decreased the selectivity. Thus, we could assume that by adjusting the monomer composition, the charged monomers could further modulate the rebinding capacity and specificity. In conclusion, as reusable materials possessing good selectivity and high rebinding capacity, the imprinted polymers are promising for applications in the field of protein separation and purification.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 4
·3553-3560
·
IF 2.431
Yue Jinping,Fan Jiahui,Li Yihan,Ren Hong
Protein is the most important characteristic component of honey. The types and content of proteins in different kinds of honey are imparity, but those in the same kind of honey are very similar. Capillary zone electrophoresis (CZE) method, used to detect proteins, was developed for authenticating of four mono-floral honeys (n = 45), including medlar honey, chaste honey, jujube honey and locust honey. Electrophoresis conditions including capillary inner diameter (50–70 μm), pH (2.5–9), the concentration of anionic surfactant (0.3–0.5 mmol L −1 ), injection time (3–7 s) and separation voltage (3–7 KV) were optimized. The results showed that the honey sample was highly stable and the detection limit was 10%, the relative standard deviation of retention time and peak area were lower than 1.40% and 1.76%, respectively. The CZE fingerprints were established on the basis of different protein characteristics in different mono-floral honeys combined with chemometric analysis. All 45 honeys could be correctly identified according to their floral origins. This method does not need to confirm the type of protein, and has the advantages of simple and fast verification of the authenticity of honey.
研究领域:
分析化学
·
食品科学
·
养蜂
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Weiping Jin,Zhifeng Wang,Dengfeng Peng,Wangyang Shen,Zhenzhou Zhu,Shuiyuan Cheng,Bin Li,Qingrong Huang
The co-existence of polysaccharides and enzymes in the food matrix could form complexes that directly influence the catalytic efficacy of enzymes. This work investigated the self-assembly behaviors of α-amylase and charged polysaccharides and fabricated the α-amylase/polysaccharides complex coacervates. The results showed that the linear charge density of polysaccharides had a critical impact on the complex formation, structure, and enzyme protection under acidic conditions. At low pH, α-amylase formed compact and tight coacervates with the λ-carrageenan. However, α-amylase/pectin coacervates dissociated when the pH was lower than 3.0. The optimized binding ratio of α-amylase/λ-carrageenan was 12:1, and α-amylase/pectin was 4:1. Finally, the α-amylase/λ-carrageenan complex coacervates effectively immobilized the enzyme and almost 70% of enzyme activity remained in coacervates after exposure to pH3.0 for 1 h. This study demonstrates that the change in the linear charge density of polysaccharides could regulate the enzyme-catalyzed process in food processing by a simple and fine-controlled method.
研究领域:
食品科学
·
生物化学
✓ 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）