JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Zhen Zhou,Xing Zhang,Tong Zhang,Wen Ma,Xiaojun Fang
Haloacetamides (HAcAms) is ubiquitously found in drinking water, which exhibits strong cytotoxicity and genotoxicity compared with conventional disinfection byproducts (DBPs). Herein, the degradation of HAcAms containing dichloroacetamide (DCAcAm) and trichloroacetamide (TCAcAm) by UV/peroxymonosulfate (PMS) process was studied. Degradation kinetics of DCAcAm and TCAcAm conformed to the first-order model, and the corresponding reaction constants were 2.27 × 10−3 and 1.94 × 10−3 s−1, respectively. The degradation rate raised with the increment of PMS dosage. During the investigation of water matrices including Cl–, HCO3–, and humic acid (HA), HCO3– and HA inhibited the degradation process whereas the influence of Cl– on the degradation was negligible. As evidenced by trapping test, •OH played the crucial role in the degradation of HAcAms. During the UV/PMS process, dechlorination was the main process. TCAcAm could be oxidized to DCAcAm and acetamide, and further mineralized to Cl–, CO2, H2O, NO2–, and NO3–. Our results demonstrated that UV/PMS could be an effective technique to degrade HAcAms in dinking water.
研究领域:
环境科学
·
水处理
·
化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yajun Li,Kui Wu,Lei Liang
The solid-liquid equilibrium solubility of 2-phenylacetamide in sixteen pure solvents, i.e. methanol, ethanol, n -propanol, isopropanol, n -butanol, isobutanol , n -pentanol, isopentanol, acetone, ethyl acetate , acetonitrile , 2-butanone, 2-pentanone, methyl acetate , ethyl formate and tetrahydrofuran was obtained over a temperature range from 273.75 K to 324.95 K by a gravimetric method under atmospheric pressure. For all the solvents investigated, the equilibrium solubility of 2-phenylacetamide increases with augmented temperature. The statistical correlations were correlated by the modified Apelblat model, λh equation, non-random two-liquid (NRTL) equation and the Wilson equation. On the basis of thermodynamic relations and the Wilson model, the dissolution enthalpy, entropy, and Gibbs free energy were calculated. The results demonstrate that the dissolution of 2-phenylacetamide is a spontaneous and entropy-driven process in the selected solvents. The solubility data, correlation models and derived dissolution properties would promote the development of the separation and reaction of 2-phenylacetamide in industry.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Cheng Liu,Yigang Ding,Jinhe Sun
Compared with single phase change materials (PCMs), organic-inorganic composite PCMs exhibits superior properties. Such as enhanced chemical stability, maintaining high energy storage density during thermal cycles. In this paper, a novel inorganic-organic composite PCM is synthesized with lithium nitrate (LNH) and acetamide (AC), which thermophysical properties are investigated systematically. The impact of α-Al 2 O 3 , β-Al 2 O 3 , expanded vermiculite, expanded graphite, boron nitride and bentonite on the energy storage density and cycle stability of composite PCM is examined intensively. The energy storage density of the composite PCM augmented with 1 wt% bentonite exhibits an increase rather than a decrease. After 100 cycles, a comparison of the data reveals that the average melting enthalpy of the PCM with bentonite (149.2 J·g −1 ) is 14.1 % higher than that without bentonite (124.2 J·g −1 ). The average enthalpy of solidification (150.8 J·g −1 ) is 21.4 % higher than that (130.7 J·g −1 ). Furthermore, the fluctuation range of the melting point and the freezing point is significantly reduced from 381.6 K–402.8 K and 313.8 K–402.2 K to 402.5 K–404.3 K and 393.8 K–403.9 K, respectively. The deviation of the melting temperature and latent heat after 100 cycles is <0.2 % in comparison to the initial value. The heat storage and release process of composite PCM in macro quantity is studied by step cooling curve test and computational fluid dynamics numerical simulation. It is confirmed that the LNH-AC/bentonite composite PCM not only has excellent long-term cycle stability, but also has no supercooling. LNH-AC/bentonite system is one of excellent candidates for solar heat storage.
研究领域:
材料科学
·
热能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Current Pharmaceutical Analysis
·
2021
·Vol. 17
·期 10
·1249-1256
·
IF 0.89
Sun Qian,Yang Yu-fei,Zou Qiao-gen,Xia Yun-yan,Han Cheng-qun
Background: A liquid chromatography-tandem mass spectrometric (LC-MS/MS) method had been developed for the quantification of acotiamide in rat plasma and been applied to pharmacokinetic studies. However, there was no LC-MS/MS method been developed for the determination of acotiamide
in human plasma and its pharmacokinetic study. Objective: A simple and fast LC-MS/MS method was established and validated for the quantification of acotiamide in human Received: plasma and was applied to a pharmacokinetic study. Methods: Sample preparation was accomplished Revised:
Accepted: through protein precipitation, and chromatographic separation was achieved on a Welch, Ultimate XB-C18 column (2.1×50 mm, 3 μm) with a security guard cartridge C18 using a binary gradient with DOI: mobile phase A (Methanol) and B (the solution of 10 mM Ammonium acetate with
0.1% Formic acid) at a flow rate of 400 μL/min. Results: The retention time of acotiamide and its internal standard, acotiamide-d6 was 1.78 min and 1.79 min, respectively. The total run time was 4.0 min. The method was developed and validated over the concentration range of 0.500-100
ng/mL for acotiamide, with correlation coefficient greater than 0.9987. The extraction recovery was more than 108.43% and the matrix effect was not significant. The inter- and intra-day precisions were below 5.80% and accuracies ranged from 92.7 to 103.0%. Acotiamide was demonstrated to be
stable in human plasma under the tested conditions. Conclusion: The validated LC-MS/MS method was successfully applied to study the pharmacokinetic profiles of acotiamide in human plasma after oral administration and has achieved satisfactory results.
研究领域:
药物分析
·
临床药理学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·19439-19449
·
IF 5.19
Wu Junxue,Wang Bin,Qu Han,Wang Fang,Duan Lei,Yu Gang
Phenacetin (PNT) is one of the most frequently detected nonsteroidal anti-inflammatory drugs in the water ecosystems, which poses a potential risk to environmental aquatic organisms. Acid-washed zero-valent aluminum (ZVAl) as a highly efficient activator for persulfate (PS) process was investigated to degrade PNT from the aqueous solution. The results indicated that acid-washed pretreatment for ZVAl could efficiently increase the degradation efficiency of PNT in the PS treatment. The degradation efficiency of PNT (50 μM) was up to 90% in 4 hours with the addition of 0.2 g/L acid-washed ZVAl and 8 mM PS at pH 6.8 and 25 °C. The PNT degradation followed pseudo-first order kinetics in the present system. High activator dosage, PS concentration, and reaction temperature could enhance the PNT degradation. The presence of inorganic anions (i.e., NO 3 - , HCO 3 - ) and humic acid (HA) showed inhibitory effects on the PNT degradation. The reuse results illustrated the acid-washed ZVAl material would have continuous and efficient activation performance for PS to degrade the PNT. Radical scavenger experiments and electron paramagnetic resonance indicated that both SO 4 •- and •OH were major reactive species during the PNT degradation. The possible degradation pathways of PNT mainly included the break of C–N and C–O bonds and further oxidation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Min Li,Bingliang Gao,Chengyuan Liu,Wenting Chen,Zhongning Shi,Xianwei Hu,Zhaowen Wang
A new acetamide based eutectic solvent is obtained via complexation with AlCl 3 . The electrodeposition of aluminum is successfully achieved from AlCl 3 /acetamide eutectic solvent. The cyclic voltammograms on tungsten electrode indicate that Al(III) are easier to be reduced from AlCl 3 /acetamide eutectic solvent at a molar ratio in a range of 1.1 to 1.5. Aluminum coatings were prepared at −0.25 V (vs. Al/Al 3+ ) and different temperatures at 313 K and 333 K in AlCl 3 /acetamide eutectic solvent at molar ratio = 1.3 (r = 1.3). The SEM images show that thick adherent aluminum films were deposited on the copper substrate. The EDS and XRD analysis confirm that the obtained deposits are pure aluminum. The present results allowed the new and cheap AlCl 3 /acetamide eutectic solvent to be a potential electrolyte for aluminum electrodeposition at room temperature .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2016
·
IF 5.991
Wenhai Chu,Xin Li,Tom Bond,Naiyun Gao,Xu Bin,Qiongfang Wang,Shunke Ding
The haloacetamides (HAcAms), an emerging class of nitrogen-containing disinfection byproducts (N-DBPs), are highly cytotoxic and genotoxic, and typically occur in treated drinking waters at low μg/L concentrations. Since many drinking distribution and storage systems contain unlined cast iron and copper pipes, reactions of HAcAms with zero-valent iron (ZVI) and metallic copper (Cu) may play a role in determining their fate. Moreover, ZVI and/or Cu are potentially effective HAcAm treatment technologies in drinking water supply and storage systems. This study reports that ZVI alone reduces trichloroacetamide (TCAcAm) to sequentially form dichloroacetamide (DCAcAm) and then monochloroacetamide (MCAcAm), whereas Cu alone does not impact HAcAm concentrations. The addition of Cu to ZVI significantly improved the removal of HAcAms, relative to ZVI alone. TCAcAm and their reduction products (DCAcAm and MCAcAm) were all decreased to below detection limits at a molar ratio of ZVI/Cu of 1:1 after 24 h reaction (ZVI/TCAcAm = 0.18 M/5.30 μM). TCAcAm reduction increased with the decreasing pH from 8.0 to 5.0, but values from an integrated toxic risk assessment were minimised at pH 7.0, due to limited removal MCAcAm under weak acid conditions (pH = 5.0 and 6.0). Higher temperatures (40 °C) promoted the reductive dehalogenation of HAcAms. Bromine was preferentially removed over chlorine, thus brominated HAcAms were more easily reduced than chlorinated HAcAms by ZVI/Cu. Although tribromoacetamide was more easily reduced than TCAcAm during ZVI/Cu reduction, treatment of tribromoacetamide resulted in a higher integrated toxicity risk than TCAcAm, due to the formation of monobromoacetamide (MBAcAm).
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Shunke Ding,Wenhai Chu,Tom Bond,Qi Wang,Naiyun Gao,Bin Xu,Erdeng Du
The occurrence of pharmaceuticals and personal care products (PPCPs) in natural waters, which act as drinking water sources, raises concerns. Moreover, those compounds incompletely removed by treatment have the chance to form toxic disinfection byproducts (DBPs) during subsequent disinfection. In this study, acetaminophen (Apap), commonly used to treat pain and fever, was selected as a model PPCP. The formation of carbonaceous and nitrogenous DBPs, namely trihalomethanes, haloacetonitriles, and haloacetamides, during chlor(am)ination of Apap was investigated. Yields of chloroform (CF), dichloroacetonitrile (DCAN), dicholoacetamide (DCAcAm), and tricholoacetamide (TCAcAm), during chlorination were all higher than from chloramination. The yields of CF continuously increased over 48 h during both chlorination and chloramination. During chlorination, as the chlorine/Apap molar ratios increased from 1 to 20, CF yields increased from 0.33 ± 0.02% to 2.52 ± 0.15%, while the yields of DCAN, DCAcAm and TCAcAm all increased then decreased. In contrast, during chloramination, increased chloramine doses enhanced the formation of all DBPs. Acidic conditions favored nitrogenous DBP formation, regardless of chlorination or chloramination, whereas alkaline conditions enhanced CF formation. Two proposed formation mechanisms are presented. The analysed DBPs formed during chlorination were 2 orders of magnitude more genotoxic and cytotoxicity than those from chloramination.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Catalysis O: Open
·
2024
·
IF 0
Huajun Wang,Jingjing Ma,Yan Li,Tengfei Wang
A series of deep eutectic solvents (DESs) with ZnCl 2 as hydrogen bonding acceptor and monoethanolamine (MEA) or acetamide as hydrogen bonding donor were prepared and used as catalysts for the reaction of glycerol and urea to synthesize glycerol carbonate (GC) without any additional organic solvent and co-catalyst. FT-IR, TGA, DSC and pH value were used to characterize the physicochemical properties of the prepared DESs. The effect of reaction temperature, urea to glycerol molar ratio, catalyst amount, and reaction time on the reaction were further investigated. The results show that ZnCl 2 :Acetamide (1:2) DES possess the highest catalytic activity because of the strong hydrogen bond network between ZnCl 2 and acetamide and the hydrogen bonding interactions between ZnCl 2 :Acetamide (1:2) and reactants, which were shown by FTIR spectra. The glycerol conversion of 93.85 % and GC yield of 90.77 % were obtained at reaction temperature of 140 °C, urea to GL molar ratio of 1:1, catalyst amount of 5 wt% (based on the GL weight) and reaction time of 2 h. Based on the experimental results and characterization by FTIR and ESI-MS, the reaction mechanism was proposed.
研究领域:
催化化学
·
绿色化学
·
有机合成
✓ 已验证
DOI
WATER RESEARCH
·
2020
·
IF 9.13
Di Zhang,Feifei Wang,Youli Duan,Shenghua Chen,Aihong Zhang,Wenhai Chu
Disinfection by-products (DBPs) are associated with various adverse health effects. Diversiform advanced treatment processes have been applied for the control of DBPs, but DBPs can still be frequently detected in tap water . Tea-leaves can be made into popular beverage and is itself a porous bio-adsorbent. By simulating tea brewing process, this study evaluated the removal of DBPs from drinking water during the tea brewing process. Removal of four trihalomethanes (THMs) and four haloacetamides (HAMs) by different fermentation degree tea-leaves was investigated. Little DBPs were removed by unfermented and semi-fermented tea-leaves (i.e., Meitan turquoise bud and Dahongpao tea) with less than 5% removal of HAMs, whereas 40% HAMs can be removed by fermented tea (i.e., Jinjunmei tea and Shuixian tea). Tea soup is neutral and slightly acidic, so little DBP hydrolysis was observed under typical tea-leaf brewing process. DBPs were mainly removed by volatilization and adsorption during tea brewing. Removal difference caused by DBP volatilization is very small. The DBP removal difference of four kinds of tea-leaves may be caused by fermentation degree. The surface of unfermented Meitan turquoise bud had a smooth and regular morphology, whereas a rough, irregular, hollow and spongy surface of fermented tea (i.e., Jinjunmei and Shuixian tea) was observed. Generally, the higher the degree of tea fermentation, the more adsorption sites, and the more removal of DBPs. Finally, the model, which takes the DBP initial concentration, tea-leaf dose and brewing time into account, was established under the experimental conditions to predict the variation of DBP concentration during tea brewing, and suggestions for DBP removal were provided to reduce DBP exposure risk. The integrated toxic risk during tea brewing was also investigated, and about 30% integrated cytotoxicity and 26% genotoxicity was reduced during Jinjunmei and Shuixian tea-leaf brewing.
研究领域:
环境科学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 4
·1696-1702
·
IF 0
Zhonghui Han,Gang Chen,Chunmei Li,Yaoguang Yu,Yansong Zhou
The one-dimensional (1D) cubic Cd0.8Zn0.2S solid-solution nanowires are first prepared by the “levelling effect” of thioglycolic acid (TGA) in a solvothermal process. It exhibits the enhanced transfer and separation efficiency of carriers to improve the photocatalytic H2-production activity. TGA not only serves as the sulphur source but also plays a template medium agent role. Furthermore, no TGA selectivity for diverse solvents to prepare 1D Cd0.8Zn0.2S solid solutions suggests that it also may be extended to the preparation of other 1D metal sulphide solid solutions in diverse solvents.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Ting-ting Yan,Ran Jiang,Dong-yang Xi,Long Ma,Dan-dan Zhang,Yi-fei Xu
This study examines the high-pressure crystal structure of trifluoroacetamide (TFA, C 2 H 2 F 3 NO) up to 15 GPa utilizing in situ high-pressure Raman scattering. Pressure-induced structural changes were tracked using Raman spectroscopy. Significant alterations in Raman spectra between 1.5 and 5.9 GPa indicate a phase transition, which proves to be reversible as the high-pressure phase reverts to the ambient phase upon release of pressure. The observed variations in NH 2 Raman modes in the high-pressure phases suggest that the phase transitions in TFA stem from rearrangements within the hydrogen-bonded networks. Moreover, we have investigated the changes in intermolecular interactions within TFA crystals under pressure using Hirshfeld surface energy and fingerprint plots. This study can provide a reference for the in-depth study of the high-pressure behavior of TFA and other related substances.
研究领域:
材料科学
·
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）