JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Hengxin Fang,Zhixu Tang,Xinjuan Liu,Yongli Huang,Chang Q. Sun
It has been a long pursuit to discriminate the ionic roles of mono- and di-valent salt solutions in modulating the hydrogen bonding network and solution properties. We attended this issue by examining the effect of concentrated YX 2 (Y Mg, Ca, Sr; X Cl, Br) solvation on O:H O bonds transition from the mode of ordinary water to hydration in terms of the number fraction f YX2 ( C ) and the segmental O:H O bond phonon stiffness shift Δω(C) with C being the solute concentration. The invariant df Y ( C ) / dC at C ≤ <0.05 suggests that the small Y 2+ forms a constantly-sized hydration droplet with weak responding to interference of other ions because its hydrating H 2 O dipoles screen mostly its electric field. However, the number inadequacy of the highly-ordered hydrating H 2 O dipoles partially screens the large X − . The X − ↔ X − electrostatic repulsion weakens its electric field. The concentration-trend consistency of the f YX2 ( C ), the solution conductivity σ YX2 ( C ), and surface stress (contact angle) θ YX2 ( C ) for YX 2 solutions clarifies their common origin of ionic polarization. However, the Jones–Dale notion disobedience of the viscosity η YX2 ( C ) suggests the dominance of the inter-ion repulsion.
研究领域:
物理化学
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材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2022
·
IF 8.943
Zixiao Ren,Haiyan Cao,Peter Desmond,Bingsheng Liu,Huu Hao Ngo,Xu He,Guibai Li,Jun Ma,An Ding
In this study, we investigated the effect of different compositions of aquatic natural organic matter (NOM) and ions on virus removal by ultrafiltration (UF). MS2 bacteriophage was used as a surrogate. Humic acid (HA) improved the MS2 removal rate from 1.95 ± 0.09 LRV to 2.40 ± 0.03 LRV at the HA dosage of 9 mg/L through the combined mechanisms of size exclusion, electrostatic repulsion and hydrophobicity . MS2 removal rate further increased to 3.10 ± 0.05 LRV by 10 mmol/L Na + dosage and 3.19 ± 0.12 LRV by Ca 2+ 1 mmol/L in the HA-containing UF system. Size exclusion turned into the dominant virus removal mechanism according to the results of the fouling model fitting and the weakening of electrostatic repulsion and hydrophobicity. The complexation of Ca 2+ also played a role in MS2 removal based on the analysis of interaction force. MS2 removal rate by bovine serum albumin (BSA) was poor, which was 2.07 ± 0.06 LRV at the BSA dosage of 9 mg/L. Hydrophobicity was greatly reduced and the dominant virus removal mechanisms were size exclusion and electrostatic repulsion. 10 mmol/L Na + in the presence of BSA deteriorated MS2 removal rate to 2.02 ± 0.07 LRV by the weakening of electrostatic repulsion, hydrophobicity and size exclusion. Electrostatic repulsion severely decreased by 1 mmol/L Ca 2+ and the enhanced adsorption barrier represented competitive adsorption of Ca 2+ by BSA and MS2 contributed for MS2 removal further decline (1.99 ± 0.05 LRV). Complex components in water will have different effects on virus removal due to their properties and interactions. This study can provide references for selecting more efficient water treatment methods according to the different compositions of raw water in actual water treatment applications during the UF process. Moreover, the retention of virus by UF can be predicted based on our study results.
研究领域:
环境科学
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水处理工程
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DOI
PubMed
高影响因子
NPG Asia Materials
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2017
·Vol. 9
·期 7
·e405
·
IF 9.157
Shi Wei,Yao Qin,Qu Sanyin,Chen Hongyi,Zhang Tiansong,Chen Lidong
The inhibitor-dependent poly(3,4-ethylenedioxythiophene) (PEDOT) fabrication suffers major problems in the areas of controllability and film thickness. In this work, we found that anions play a key role in both the polymerization and the structure of PEDOT. As a precursor, anions greatly influence the reaction rate and oxidant solubility. In its role as a counter-ion, the anions also affect chain conductance and crystal growth. With these behaviors in mind, a self-inhibited polymerization approach using novel oxidants with appropriate anions was successfully developed to facilitate the fabrication of high quality in situ polymerized PEDOT films and solve the thickness limitation problem. Inhibitor-free heavy oxidative solutions with weakly basic anions enable the spin-coating of thick and homogeneous oxidant layers and also effectively inhibit both the crystallization of the oxidant and H + formation throughout the polymerization process. PEDOT: dodecylbenzenesulfonate (PEDOT:DBSA) exhibits the highest performance among all candidates due to its appropriate anion basicity and low steric effect. An extremely high doping level of 42.9% is achieved, and an electrical conductivity of ~1100 S cm −1 is successfully maintained for film thicknesses between 310 nm and 1.79 μm. In addition, the thermoelectric power factor (RT) for pristine films was improved to 77.2 μW mK −2 from 69.6 μW mK −2 by the dedoping treatment. This study provides a new approach for fabricating high performance PEDOT thick films using anion-based design.
研究领域:
材料科学
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化学工程
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电子材料
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Mei Liu,Shijing Xu,Shaohua Zhu,Jiazhong Wu,Bofeng Bai,Chengzhen Sun
Following the first part of this study, herein, we focus on the oil-wet rock surfaces formed by the adsorption of polar molecules via base interactions. The effects of ions on the oil–water wettability of quartz surfaces and the mechanism behind the phenomenon are revealed through contact angle measurements and surface characterization. The results indicate that the ions can greatly alter the wettability of the surface to become more water-wet only when the salt solutions are alkaline, with a maximum decrease of approximately 20° in the water contact angle. NaCl and KCl solutions are more effective than CaCl 2 and Na 2 SO 4 solutions. In alkaline solutions, the hydroxyl ions can deprotonate the octadecylamine molecules to weaken their interactions with the surfaces, such that the cations can displace the adsorbed octadecylamine and lead to large desorption from the surfaces. Finally, a quantitative model is established to describe the ion-induced wettability alteration.
研究领域:
地质学
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表面化学
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
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IF 11
Sha Yang,Jun Chen,Gaomeng Xu,Lizhen Deng,Changhong Li,Ti Li,Chengmei Liu,Taotao Dai
This work investigated the effect of pH shifting with NaOH/Ca(OH) 2 , as well as its combination with ion addition (Na + , K + , Ca 2+ , and Mg 2+ ), on the regulating mechanism of foaming properties of rice dreg protein (RDP). The results showed that the foam ability of RDP, RDP subjected to pH shifting with NaOH and Ca(OH) 2 (Na3 and Ca3), and RDP subjected to pH shifting combined with ion addition (Na3+KCl, Na3+CaCl 2 , and Na3+MgCl 2 ) was 33%, 108%, 300%, 123%, 245%, and 177%, respectively. Notably, the Ca3 (73%) and Na3+CaCl 2 (72%) samples also displayed exceptional foam stability among all samples. The SEM-EDS results revealed that Ca 2+ gradually covered the bubble surface to form a smooth film within 30 min. The results of the interfacial properties showed that Ca 2+ promoted the adsorption of protein molecules to the air-water interface at the fastest rate and induced the strongest interaction between protein molecules involved in forming the interface film. Besides, the particle size, zeta potential , FTIR, and amino acid composition analysis confirmed that Na + bound to the amino groups of Asp and Phe, while Ca 2+ primarily bound with RDP through interactions with the carboxyl oxygen and amino nitrogen of Gly, Tyr and Glu. Different ways of binding between protein molecules and ions resulted in differences in foam stability. This study can provide the theoretical basis for the ion-binding protein in interface-dominated food systems.
研究领域:
食品科学
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蛋白质化学
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DOI
高影响因子
GREEN CHEMISTRY
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2020
·Vol. 22
·期 5
·1630-1638
·
IF 9.48
Bin Zhang,Mark Douthwaite,Qiang Liu,Chao Zhang,Qifan Wu,Ruhui Shi,Peixuan Wu,Ke Liu,Zhuangqing Wang,Weiwei Lin,Haiyang Cheng,Ding Ma,Fengyu Zhao,Graham J. Hutchings
A novel method for the synthesis of MFI zeolites has been developed, which does not require any crystal seeds or solvent. The adaptability of this method was also evidenced; a series of ZSM-5 zeolites with differing Si/Al ratios (18∼∞) were synthesized, which to date, has been a challenge in the field of solvent-free synthesis. The materials were probed by in situ DRIFTS and 2D 27Al–19F HETCOR NMR spectroscopy, the results from which indicated that fluorine-containing species play a crucial role in the crystallization of ZSM-5. During the crystallization process F− anions coordinate with Al3+ cations, resulting in the formation of 6-coordinated “F–Al–O–Si” species. It is these intermediate species which drive the formation of tetrahedral [AlO4]− units in the zeolitic framework. The effectiveness of these materials as catalyst supports was subsequently assessed in the hydrogenation of levulinic acid and glucose, which exhibited a comparable performance to commercial ZSM-5. The simple, efficient and low-cost method presented herein provides an alternative approach for the green scaled-up synthesis of zeolites.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2016
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IF 5.393
Guicai Liu,Shuili Yu,Haijun Yang,Jun Hu,Yi Zhang,Bo He,Lei Li,Zhiyuan Liu
Polymer (i.e., anionic polyacrylamide (APAM)) fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and its relationships to intermolecular interactions were investigated using atomic force microscopy (AFM). Distinct relations were obtained between the AFM force spectroscopy measurements and calculated fouling resistance over the concentration polarization layer (CPL) and gel layer (GL). The measured maximum adhesion forces (Fad,max) were closely correlated with the CPL resistance (Rp), and the proposed molecular packing property (largely based on the shape of AFM force spectroscopy curve) of the APAM chains was related to the GL resistance (Rg). Calcium ions (Ca2+) and sodium ions (Na+) caused more severe fouling. In the presence of Ca2+, the large Rp corresponded to high foulant–foulant Fad,max, resulting in high flux loss. In addition, the Rg with Ca2+ was minor, but the flux recovery rate after chemical cleaning was the lowest, indicating that Ca2+ created more challenges in GL cleaning. With Na+, the fouling behavior was complicated and concentration-dependent. The GL structures with Na+, which might correspond to the proposed molecular packing states among APAM chains, played essential roles in membrane fouling and GL cleaning.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuyang Qin,Hongjing Li,Jun Ma
The effect of chloride ion (Cl − ) on the degradation of organic contaminants (OCs) by thermally activated peroxymonosulfate (TAP) was assessed in this study. P -aminobenzoic acid (PABA), sulfadiazine (SDZ), bisphenol A (BPA), and chloramphenicol (CAP) were employed as model OCs with different structure. The degradation efficiencies of PABA, SDZ, BPA, and CAP were respectively 76.4 %, 90.8 %, 10.1 %, and 14.5 % by TAP (70 °C) after 60 min treatment, further raised to 97.6 %, 97.4 %, 55.2 %, and 30.5 % in the presence of Cl − (1 mM). When Cl − concentration increased to 10 mM, PABA and SDZ were completely degraded respectively after 7 min and 10 min, 97.1 % of BPA and 59.5 % of CAP were removed within 60 min. In TAP system, PABA and SDZ were primarily degraded by direct peroxymonosulfate (PMS) oxidation , while BPA and CAP were mostly removed by hydroxyl radical and sulfate radical oxidation. In Cl − /TAP mixtures, the degradation of PABA and BPA was mainly attributed to hypochlorous acid oxidation, SDZ was chiefly removed via direct PMS oxidation, and CAP was principally oxidized by radicals. Furthermore, the intermediate products of OCs degradation during Cl − /TAP oxidation were identified, and primary degradation pathways were proposed. The removal efficiencies of total organic carbon were markedly improved from 19.3 % to 25.3 % by TAP to 52.6 %–69.0 % in Cl/TAP system. The concentrations of typical chlorinated by-products after OCs oxidation were 17.2 μg/L–86.3 μg/L in Cl − /TAP system. Considering the complexity of actual wastewater, 51.3 %–100 % removal efficiencies of OCs by TAP oxidation were achieved in Cl − -containing secondary effluent. Understanding the role of Cl − in OCs degradation is essential for the practical application of Cl − /TAP oxidation in advanced wastewater treatment.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Gang Zhang,Zhaohui Huo,Yanli Zhou,Xiaohua Zhu,Hongru Wang,Yong Liang,Maotian Xu
The amino acid residues for reduction and binding of amyloid–β peptide (Aβ)–Fe(III) complexes were investigated mainly by voltammetry at boron-doped diamond electrodes. Distinguished from natural Fe(III)–Aβ(1–16) complex, the recovering redox behavior of Fe(III)–Aβ(Y–F) complex showed higher free-ion concentration and weaker bonding ability, evidencing that Fe(III) primarily binded to Aβ via Tyr10. Whereas, there were no detectable distinctions in electroactivity along with UV/vis absorptivity and fluorescence quenching between Fe(III)–Aβ(1–16) and Fe(III)–Aβ(H–N), which indicates that three His were eliminated in direct bonding to Fe(III). Compared with Fe–Aβ(1–16), the significant enhancement of Ip (Fe(II)-Fe(0)) in Fe–Aβ(1–42), Fe–Aβ(25–35), and even the exogenous Met to Fe(III) provided electrochemical evidences that the reduction of Fe(III) to Fe(II) was aroused by Met directly. Zn(II) which was redox-silent, also contributed the pathogenesis but can not affect the redox signal of Fe(III)–Aβ.
研究领域:
生物化学
·
神经科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）