CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jing Wang,Tong Zheng,Chen Cai,Yanxiang Zhang,Huiling Liu
The oxidation of ethanethiol (C 2 H 5 SH), as a representative odorous pollutant, by ferrate (Fe(VI)) in aqueous alkaline solution was investigated to understand its kinetics, stoichiometry, and reaction pathways. The reaction kinetics and fraction of different intermediates were found highly dependent on pH. The reaction behaved as a 5/2-order reaction in a pH range of 8.0–10.0, and a second-order reaction in a pH range of 10.5–12.0. The rate constants decreased with increased pH, and the speciation of Fe(VI) and C 2 H 5 SH during the reaction were further discussed. C 2 H 5 SH was finally oxidized to nonvolatile and odorless sulfonic acid (C 2 H 5 SO 3 H) with the intermediates of sulfinic acid (C 2 H 5 SO 2 H) and disulphide (C 2 H 5 SSC 2 H 5 ). A plausible mechanism involving two competing reactions for C 2 H 5 S radicals was proposed to explain the pH-dependent reaction order. In addition, kinetics and products of C 2 H 5 SH degradation by Fe(VI) were compared with other oxidants (O 3 , chlorine, ClO 2 , KMnO 4 , H 2 O 2 , and OH). Our results provided a deep understanding of C 2 H 5 SH degradation by Fe(VI) in aqueous alkaline solution.
研究领域:
环境科学
·
化学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jing Wang,Tong Zheng,Huiling Liu,Gang Wang,Yanxiang Zhang,Chen Cai
In this study, the electrochemical generation of ferrate (Fe(VI)) from grey cast iron anode in sodium hydroxide (NaOH) solution was utilized in situ to degrade the malodorous pollutant of ethanethiol (C 2 H 5 SH). During electrolysis, C 2 H 5 SH was oxidized by the combination of direct anodic oxidation and Fe(VI) oxidation (indirect oxidation). The direct anodic oxidation process, which played an important role in the decontamination process but was often disregarded in related studies, was investigated in detail. The electrochemical generation of Fe(VI) was investigated, and the maximum current efficiency of Fe(VI) generation was obtained in 14 M NaOH solution. The voltammetry studies of the grey cast iron anode in NaOH solutions containing and without C 2 H 5 SH revealed that the dissolution of anode was improved in the presence of C 2 H 5 SH. A decrease in NaOH concentration increased the contribution of direct anodic oxidation but decreased the electrochemical generation of Fe(VI). C 2 H 5 SH was degraded on the grey cast iron anode at a higher rate in less concentrated NaOH solution ( k = 4.15 × 10 −2 min −1 in 2 M NaOH solution), which could be ascribed to the enhancement in direct anodic oxidation as well as in the oxidizing power of Fe(VI). Higher current density promoted the degradation rate of C 2 H 5 SH in both direct and indirect oxidation processes, but it also decreased the current efficiency due to the improvement of the side reactions. Additionally, the in-situ and on-line applications of the electrochemical generated Fe(VI) in recent studies were presented and discussed. This study provides a comprehensive understanding of C 2 H 5 SH oxidation on grey cast iron anode, and offers a feasible electrochemical scrubbing approach using grey cast iron as the anode for C 2 H 5 SH odors control.
研究领域:
环境科学
·
电化学工程
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DOI
高影响因子
npj Clean Water
·
2024
·Vol. 7
·期 1
·1-9
·
IF 10.4
Xiao Jun,Hao Shuang,Qin Yiwen,Qi Pengfei,Zhang Zhaoqian,Hu Yunxia
Many fouling-resistant materials have been grafted or coated on the RO membrane surface for fouling-resistance. However, these modified RO membranes still exhibit a fast flux drop towards small charged organic foulants. Herein, we creatively use the quantum chemistry method to screen the thiol group having a close to zero interaction energy with small charged organic foulants. Thus, we selected a small molecule of 2-aminoethanethiol (AET) having a fouling-resistant thiol group and a reactive amine group for RO membrane surface modification. The water permeance of the AET-grafted RO membrane increases from 2.6 ± 0.1 L m −2 h −1 bar −1 to 3.2 ± 0.05 L m −2 h −1 bar −1 , 23% higher than that of the pristine membrane. Moreover, the AET-grafted RO membrane exhibits excellent fouling resistance against charged surfactants. Our study offers insights on the design of fouling-resistant molecules for antifouling surface modification of RO membranes towards small charged organic foulants.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2014
·Vol. 99
·期 7
·3211-3220
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IF 3.811
Wang Xiangqian,Wu Chao,Liu Nan,Li Sujing,Li Wei,Chen Jianmeng,Chen Dongzhi
A Pseudomonas sp. strain WL2 that is able to efficiently metabolize ethyl mercaptan (EM) into diethyl disulfide (DEDS) through enzymatic oxidation was isolated from the activated sludge of a pharmaceutical wastewater plant. One hundred percent removal of 113.5 mg L −1 EM and 110.3 mg L −1 DEDS were obtained within 14 and 32 h, respectively. A putative EM degradation pathway that involved the catabolism via DEDS was proposed, which indicated DEDS were further mineralized into carbon dioxide (CO 2 ), bacterial cells, and sulfate (SO 4
2− ) through the transformation of element sulfur and ethyl aldehyde. Degradation kinetics for EM and DEDS with different initial concentrations by strain WL2 were evaluated using Haldane-Andrews model with maximum specific degradation rates of 3.13 and 1.33 g g −1 h −1 , respectively, and maximum degradation rate constants of 0.522 and 0.175 h −1 using pseudo-first-order kinetic model were obtained. Results obtained that aerobic degradation of EM by strain WL2 was more efficient than those from previous studies. Substrate range studies of strain WL2 demonstrated its ability to degrade several mercaptans, disulfides, aldehydes, and methanol. All the results obtained highlight the potential of strain WL2 for the use in the biodegradation of volatile organic sulfur compounds (VOSCs).
研究领域:
微生物学
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环境科学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 29
·1902446
·
IF 15.621
Chenghao Bi,Stephen V. Kershaw,Andrey L. Rogach,Jianjun Tian
A surface engineering strategy aimed at improving the stability of CsPbI 3 perovskite quantum dots (QDs) both in solution and as films is demonstrated, by performing partial ligand exchange with a short chain ligand, 2-aminoethanethiol (AET), in place of the original long chain ligands, oleic acid (OA) and oleylamine (OAm), used in synthesis. This results in the formation of a compact ligand barrier around the particles, which prevents penetration of water molecules and thus degradation of the films and, in addition, at the same time improves carrier mobility. Moreover, the AET ligand can passivate surface traps of the QDs, leading to an enhanced photoluminescence (PL) efficiency. As a result, AET-CsPbI 3 QDs maintain their optical performance both in solution and as films, retaining more than 95% of the initial PL intensity in water after 1 h, and under ultraviolet irradiation for 2 h. Photodetectors based on the AET-CsPbI 3 QD films exhibit remarkable performance, such as high photoresponsivity (105 mA W −1 ) and detectivity (5 × 10 13 Jones at 450 nm and 3 × 10 13 Jones at 700 nm) without an external bias. The photodetectors also show excellent stability, retaining more than 95% of the initial responsivity in ambient air for 40 h without any encapsulation.
研究领域:
材料科学
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光电材料
·
纳米技术
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产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xihong Ding,Demeng Qian,Hui Wang,Qian Hu,Lin Zhu,Hui Chen,Tengda Xu,Aohan Li,Wei Hong
This study investigates the role of 2-aminoethanethiol hydroiodate (2-AET·HI) additives in enhancing the phase stability and photovoltaic performance of CsPbI3 films for inorganic perovskite solar cells. The incorporation of 2-AET·HI into the precursor solution results in a more uniform and compact film morphology. X-ray diffraction (XRD) analysis reveals that the 2-AET·HI-treated CsPbI3 films retain their black α-phase, even after 300 h at 25% RH and ∼25 °C, whereas the control samples show a rapid transition to the nonphotoactive δ-phase. This improvement in phase stability is reflected in the enhanced photovoltaic performance, with the 2-AET·HI-modified devices exhibiting a power conversion efficiency (PCE) of 16.7%, compared to 15.4% for the control devices. Furthermore, the 2-AET·HI-modified devices display superior long-term stability, retaining 83% of their initial PCE after 192 h in ambient conditions, in stark contrast to the unmodified devices, which degrade rapidly.
研究领域:
材料科学
·
能源技术
·
光伏研究
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产品关联
DOI
PubMed
高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2015
·Vol. 35
·期 2
·355-364
·
IF 2.056
Zhu Chengzhu,Liu Ying,Lu Jun,Yang Zhe,Li Yunxia,Chen Tianhu
The removal of gaseous ethanethiol (EtSH) via dielectric barrier discharge (DBD) combined with 185 nm UV-light energized by a DBD power supply has been investigated. EtSH removal efficiency and energy yield had been examined as a function of EtSH initial concentration, input power, gas flow rate and relative humidity of gas flow. The results showed that DBD combined with 185 nm UV-light could improve EtSH removal efficiency by about 10.4 % and increase energy yield by 0.4 g (kWh) −1 as compared with DBD treatment only. When increasing initial EtSH concentration and flow rate, a higher energy yield was obtained. And EtSH removal efficiency increased as the relative humidity increased to about 70 %, then decreased when the humidity continue to increase. Moreover, the possible reaction pathways were proposed based on the products identified by FT-IR.
研究领域:
环境科学
·
大气污染控制
·
等离子体化学
·
光化学
·
能源与环境技术
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 7
·3847-3858
·
IF 1.369
Yang Chao,Wang Jian,Fan Hui-Ling
A series of 3DOM and non-3DOM metal oxide–silica composites were prepared and tested dynamically in a packed-bed reactor at room temperature to remove ethanethiol from a gas stream containing ethyl mercaptan in moist N 2. The obtained sorbents were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption techniques. The experimental results showed that the adsorption ability of different kinds of metal oxide–silica composites with 3DOM structure decreased in the sequence: 3D-CuO/SiO 2 > 3D-NiO/SiO 2 > 3D-Co 3 O 4 /SiO 2 > 3D-ZnO/SiO 2 . The best ratio of CuO to SiO 2 of 3DOM copper–silicon oxide sorbents for ethanethiol removal was found to be 1:2. The 3DOM structure could improve the removal activity of sorbents remarkably because of the high porosity with ordered interconnected macropores as well as the large surface area and high dispersion of CuO. It was also found that a moist atmosphere greatly benefited the adsorption of ethanethiol at ambient condition.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Syed Adil Shah,Kuo-Juei Hu,Muhammad Naveed,Cao Lu,Shengyong Hu
Herein, gold-nanoclusters Au 6 (SR) 6 are synthesized in the argon atmosphere, using 2-phenylethanethiol and tetraoctylammonium bromide, as ligands and surfactants, respectively. Au 6 (SR) 6 possesses ca. 1.95 eV HOMO-LUMO gap, which is comparatively high and is also a dominant factor for quantum confinement effect. Moreover, the X-ray Photoelectron Spectroscopy (XPS) study shows the peak of Au 4f 7/2 appears at 86.89 eV, which describes the consistency regarding the size of clusters with XPS peak shift for Au 4f 7/2 value. In addition, the full width half maximum (FWHM) increases accordingly by decreasing the size of clusters.
研究领域:
纳米技术
·
材料科学
·
物理化学
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 3
·627-636
·
IF 1.967
Jong Kwanghyok,Ju Benzhi,Xiu Jinghai,Her Ryohua,Son Sunil
In this study, a novel type of temperature/pH dual responsive polymer PyHES- DMAET ((2-hydroxy-3-(2-propynyloxy) propyl hydroxyethyl starch (PyHES))-2-(dimethylamino) ethanethiol (DMAET)) was synthesized. First, the temperature-responsive polymer PyHES was prepared via hydrophobic modification of hydroxyl groups in hydroxyethyl starch (HES) with propynylglycidyl ether (PGE) subsequently; pH-responsive tertiary amine group was connected to the propynyl group via a thiol-yne click reaction. Because PyHES-DMAET has pH-responsive amino groups and hydrophobic thioether groups, its aqueous solution exhibits excellent temperature/pH dual sensitivity, i.e., a good transference between the hydrophobic (or self-assembly) and hydrophilic (or swelling) state along as a result of changing temperature/pH values; these properties can be exploited, for hydrophobic drug release. The drug release reached 96% at 37 °C and a pH of 6.5. The drug loading capacity of PyHES-DMAET was increased by increasing the degree of substitution (DS) of the hydrophobic propynyl groups in the PyHES. The highest drug loading capacity for doxorubicin (DOX) achieved in this study was 33 wt%.
研究领域:
高分子化学
·
药学
·
材料科学
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产品关联
DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2014
·Vol. 14
·期 10
·1429-1436
·
IF 3.65
Dongming Xing,Lie Ma,Changyou Gao
Maleimide-functionalized poly(ester carbonate)s are synthesized by ring-opening copolymerization of furan–maleimide functionalized trimethylene carbonate (FMTMC) with L -lactide and a subsequent retro Diels-Alder reaction. The maleimide groups on poly(ester carbonate)s are amenable to Michael addition with thiol-containing molecules such as 3-mercapto-1-propanol, 2-aminoethanethiol hydrochloride, and mercaptoacetic acid under mild conditions, enabling the formation of biodegradable materials with various functional groups (e.g., hydroxyl, amine, and carboxyl). In particular, the maleimide-functionalized poly(ester carbonate) is clicked with a laminin-derived peptide CQAASIKVAV. In vitro culture of PC12 cells shows that the maleimide-functionalized polymers, especially the CQAASIKVAV-grafted one, could support cell proliferation and neurite outgrowth. The maleimide-functionalized poly(ester carbonate)s provide a versatile platform for diverse functionalization and have comprehensive potential in biomedical engineering.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Dan Luo,Xin Niu,Hui Li,Lingzhu Wang,Li Chen,Hao Liu
Electroencephalography (EEG) is a generally adopted method to monitor a person's brain activity. Traditional EEG recording usually uses wet electrodes with lower contact impedance due to conductive gels. Nonetheless, the conductive gel needs pretreated skin, which leads to allergies by long-term use. In this paper, a kind of barb micro-structured (BMS) dry electrode is presented. The coating, electrical, and electrochemical properties of the electrode are studied in detail. The EEG signals of calm and blinking eyes can be collected by placing the BMS dry electrode on the forehead of the human body. Compared to the traditional wet and planar dry electrodes, BMS dry electrodes do not need pretreated skin before use, and they have a stronger anti-hair interference performance. They also record high-quality EEG signals. Further, a mercaptan treatment is used on the surface of the electrode, which effectively improves its corrosion resistance rate (corrosion resistance rate of 26.78%), which is conducive to the long-term use of the electrode, and forms a research basis for the development of the intelligent wearable field.
研究领域:
生物医学工程
·
神经科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）