WATER RESEARCH
·
2025
·
IF 12.4
Jung-Hyun Son,Wen-Long Wang,Peng-Hui Liu,Hang Su,Ju-Won Lee,Min-Yong Lee,Qian-Yuan Wu
This study investigates the enhancement of ozonation efficiency through the introduction of manganese ions (O 3 /Mn(II)) that significantly improve the degradation of ozone-persistent organic pollutants. Manganese ions accelerate hydroxyl radical generation by catalyzing ozone decomposition, thereby facilitating more effective oxidative reactions. The application of O 3 /Mn(II) to degrade N, N-Diethyl-3-toluamide (DEET) achieved a decomposition efficiency of 3.6 to 4.1 times higher than ozonation alone. The promotive effect was highly pH-dependent, with the observed rate constant ( k obs ) for O 3 /Mn(II) reaching 97.05 M −1 s −1 at pH 4, approximately 3.3 times greater than ozonation alone, and 686.93 M −1 s −1 at pH 7, around 1.7 times higher. O 3 oxidation contributed approximately 1% to the overall process, while hydroxyl radicals accounted for approximately 80%, and manganese species accounted for approximately 20%. Furthermore, the oxidation state of manganese significantly influenced the cooperative oxidation efficiency, with Mn(VII) achieving the highest k obs (680.87 M −1 s −1 ), while Mn(IV) exhibited the lowest (304.6 M −1 s −1 ). Additionally, intermediate products formed during DEET oxidation were identified using Orbitrap technology, elucidating various degradation pathways (such as decarboxylation, tri-hydration, and aromatic ring opening). These findings provide valuable insights into enhancing ozonation processes for environmental remediation.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiaoyan Zheng,Tianhao Zhang,Jie Li,Guoliang Zhang,Hongnan Chen,Shasha Cao,Chunshan Li,Guangzhou Jin
2-Ethyl-3-oxazolidineethanol (OE) is an important pharmaceutical intermediate for the treatment of dental plaque. A systematic investigation of the one-pot synthesis of OE from propanal (PA) and diethanolamine (DEA) was conducted herein. The process was carried out under mild reaction conditions without any addition of catalyst, and the product was characterized by Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance (NMR), and electrospray ionization-tandem mass spectrometry (ESI-MS/MS). Additionally, the effects of the PA/DEA ratio, methanol/DEA ratio, reaction time, and temperature on the reaction results were explored. Based on the single-factor experiments, response surface methodology (RSM) was used to optimize the reaction conditions and it achieved a high OE yield of 98.48%, which is close to the prediction value of 98.38%. Furthermore, the reaction kinetics were calculated utilizing the second-order kinetic model, and activation energies of the forward and reverse reactions were 31.35 and 41.85 kJ·mol–1, respectively. Under the optimization reaction conditions, OE was efficiently synthesized, indicating a significant potential for industrial applications.
研究领域:
有机化学
·
制药工程
·
化工过程优化
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 41
·32416-32420
·
IF 3.84
Kang Qin,Kai Wang,Yang Li,Fanhe Kong,Tao Wang
The phase behavior of the 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]) and carbon dioxide (CO2) system from atmospheric to supercritical state was investigated at 0.1–15.0 MPa and 308.15–343.15 K. The solubility data of CO2 in [emim][BF4] and the volumetric expansion ratios of CO2-saturated [emim][BF4] were provided. Experimental results indicated that although CO2 dissolved significantly in [emim][BF4] (from 0 to 62 mol%), the ionic liquid phase only had an expansion ratio less than 17 vol%. The density difference between CO2-saturated [emim][BF4] and pure [emim][BF4] was obvious at high pressure and low temperature, with a maximum of 16.11% at 308.15 K and 15.0 MPa. Based on the experimental results, a fitting equation applicable to precise data interpolation was proposed for the CO2-saturated [emim][BF4] density in this study.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
MATERIALS SCIENCE-POLAND
·
2021
·Vol. 39
·期 3
·371-382
·
IF 1.022
Cheng Chen,Bi-Wu Huang,Zheng-Ting Lu,Yang Wu
Precursor 3-ethyl-3-hydroxymethyloxetane was synthesized with trihydroxypropane and diethyl carbonate as the main raw materials. Intermediate 3-ethyl-3-allylmethoxyoxetane was synthesized with 3-ethyl-3-hydroxymethyloxetane and allyl bromide. Prepolymer 1,3-bis[(3-ethyl-3-methoxyoxetane)propyl]tetramethyldisiloxane was synthesized with 3-ethyl-3-allylmethoxyoxetane and 1,1,3,3-tetramethyldisiloxane. Cationic photoinitiator triarylsulfonium hexafluoroantimonate of 3 wt% was added to the prepolymer, and a novel kind of photosensitive resin was prepared. Structures of the compounds obtained at individual stages of the synthesis were analyzed and characterized by FTIR and 1H-NMR. Photo-DSC analysis showed that the prepolymer had excellent photosensitivity. Thermogravimetric analysis (TG) revealed that the ultraviolet (UV)-cured samples owned excellent thermal stabilities of up to 405°C. And the mechanical properties of the UV-cured samples were tested by the universal material testing machine, giving 25.95 MPa of tensile strength, 2,935.15 MPa of elastic modulus, and 4.09% of elongation at break.
研究领域:
高分子科学
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材料科学
·
化学工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Wenbo Li,Yilin Wang,Dongchen Li,Jiachi Jiang,Kunlan Li,Kaili Zhang,Qingda An,Shangru Zhai,Ligang Wei
The oxidative depolymerization of alkali lignin (AL) in 1-ethyl-3-methylimidazolium acetate ([C 2 C 1 im]OAc) system without additional catalyst was investigated under mild conditions (initial O 2 pressure of 1.5 MPa, 80 °C–100 °C). Compared with other ionic liquids (ILs), the cooperation of imidazolium cation and acetate anion successfully enhanced AL conversion. Among the investigated imidazolium acetate ILs with ethyl- to octyl-side chains, [C 2 C 1 im]OAc presented the best catalytic capacity for AL oxidative depolymerization. Adding an appropriate amount of water to [C 2 C 1 im]OAc can further improve the reaction efficiency. In the [C 2 C 1 im]OAc system with the addition of 0.10–0.25 mL of water, approximately 77 wt% AL was depolymerized into small molecule soluble products at 100 °C for 2 h. The extracted oil was composed mainly of phenolic derived compounds. With the use of the [C 2 C 1 im]OAc-based system, the specific inter-unit linkages of lignin were broken down, and residual lignin with low molecular weight and narrow polydispersity index (1.88–1.96) was obtained. Compared with that in AL conversion with fresh [C 2 C 1 im]OAc, only a minimal decrease (~3.2%) was observed with the recovered IL until the fifth cycle. These findings revealed that [C 2 C 1 im]OAc–based system is a simple and efficient catalytic system for lignin oxidative depolymerization.
研究领域:
化学工程
·
生物质能
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DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2023
·Vol. 96
·期 2
·237-244
·
IF 0.9
Wang Bin,He Yaqi,Jiang Fan,Ma Xiangmei
Abstract Poly(vinyl chloride) (PVC) is one of the most used polymers, but the mechanical and esthetic properties can deteriorate for use outdoors because of ultraviolet (UV) light or heat. The addition of stabilizers is indispensable method for improving the stability of PVC. In this work, a facile synthetic method of CeO 2 quantum dots (QDs) was used, for achieving the best dispersion and improvement of anti-UV properties, the surface of CeO 2 QDs was modified by ethyl 3,4-dihydroxybenzoate (EDHB), which was dispersed within the PVC matrix using the casting method to investigate the anti-UV and thermal properties. X-ray powder diffraction spectra (XRD), infrared spectroscopy (FT-IR), high resolution transmission electron microscopy (HRTEM), UV spectrophotometry and thermogravimetric analysis (TGA) were applied to characterize the structures, morphologies, and properties. The results highlighted that EDHB/CeO 2 can help reduce damages of PVC upon exposure to ultraviolet (UV) light and heat.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
Journal of Animal Science and Biotechnology
·
2021
·Vol. 12
·期 1
·1-12
·
IF 5.032
Li Zongjun,Lei Xinjian,Chen Xiaoxu,Yin Qingyan,Shen Jing,Yao Junhu
Background In recent years, nitrooxy compounds have been identified as promising inhibitors of methanogenesis in ruminants. However, when animals receive a nitrooxy compound, a high portion of the spared hydrogen is eructated as gas, which partly offsets the energy savings of CH 4 mitigation. The objective of the present study was to evaluate the long-term and combined effects of supplementation with N-[2-(nitrooxy)ethyl]-3-pyridinecarboxamide (NPD), a methanogenesis inhibitor, and fumaric acid (FUM), a hydrogen sink, on enteric CH 4 production, rumen fermentation, bacterial populations, apparent nutrient digestibility, and lactation performance of dairy goats. Results Twenty-four primiparous dairy goats were used in a randomized complete block design with a 2 × 2 factorial arrangement of treatments: supplementation without or with FUM (32 g/d) or NPD (0.5 g/d). All samples were collected every 3 weeks during a 12-week feeding experiment. Both FUM and NPD supplementation persistently inhibited CH 4 yield (L/kg DMI, by 18.8% and 18.1%, respectively) without negative influence on DMI or apparent nutrient digestibility. When supplemented in combination, no additive CH 4 suppression was observed. FUM showed greater responses in increasing the molar proportion of propionate when supplemented with NPD than supplemented alone (by 10.2% vs. 4.4%). The rumen microbiota structure in the animals receiving FUM was different from that of the other animals, particularly changed the structure of phylum Firmicutes. Daily milk production and serum total antioxidant capacity were improved by NPD, but the contents of milk fat and protein were decreased, probably due to the bioactivity of absorbed NPD on body metabolism. Conclusions Supplementing NPD and FUM in combination is a promising way to persistently inhibit CH 4 emissions with a higher rumen propionate proportion. However, the side effects of this nitrooxy compound on animals and its residues in animal products need further evaluation before it can be used as an animal feed additive.
研究领域:
动物营养学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2016
·Vol. 13
·期 9
·925
·
IF 2.035
Hong-Qin Sun,Yang Du,Zi-Yang Zhang,Wen-Jing Jiang,Yan-Min Guo,Xi-Wu Lu,Yi-Min Zhang,Li-Wei Sun
Benzophenone (BP) andN,N-diethyl-3-methylbenzamide (DEET) are two chemicals often used in personal care products (PCPs). There is a lack of systematic ecotoxicological evaluations about the two chemicals to aquatic organisms. In the present study, the acute toxic effects onChlorella vulgaris,Daphnia Magana, andBrachydanio reriowere tested and the ecotoxicological risks were evaluated. For BP, the 96-h half-maximal effective concentration (EC50) onC. vulgariswas 6.86 mg/L; the 24-h median lethal concentration (LC50) onD. maganawas 7.63 mg/L; the 96-h LC50onB. reriowas 14.73 mg/L. For DEET, those were 270.72 mg/L, 40.74 mg/L, and 109.67 mg/L, respectively. The mixture toxicity of BP and DEET, onC. vulgaris,D. magana, andB. rerioall showed an additive effect. The induced predicted no-effect concentrations (PNECs) for BP and DEET by assessment factor (AF) method are 0.003 mg/L and 0.407 mg/L, respectively. Both are lower than the concentrations detected from environment at present, verifying that BP and DEET are low-risk chemicals to the environment.
研究领域:
环境科学
·
毒理学
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DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 39
·e202404063
·
IF 1.9
Xiangmei Ma,Shengmin Pan,Yiqing Wu,Bin Wang
Graphical A novel composite (BCE) by depositing ethyl 3,4-dihydroxybenzoate on the surface of Bi2S3-doped CeO2 was synthesized, and the prepared BCE/polyvinyl chloride (PVC) composite films displaied excellent UV-shielding property, butbarely catalytic thermal decomposition of the PVC matrix. In this study, bismuth sulfide (Bi 2 S 3 )-doped cerium oxide (CeO 2 ) was prepared via hydrothermal method, and by depositing ethyl 3,4-dihydroxybenzoate (EDHB) on the surface of Bi 2 S 3 /CeO 2 (Bi 2 S 3 /CeO 2 /EDHB and BCE). The samples were characterized by FTIR, XRD, TEM, and UV–vis absorption spectrum means. According to the characterizations, Bi 2 S 3 was successfully incorporated into the CeO 2 structure (Bi 2 S 3 /CeO 2 ), and the prepared BCE/PVC composite films display excellent UV-shielding property. Moreover, the result of thermogravimetric analysis (TGA) tests indicated that BCE also was barely catalytic thermal decomposition of PVC matrix. This work not only paves an attractive way for the design of the CeO 2 -based UV-shielding agent, but also provides valuable insights into the inspiration to construct high-performance UV-shielding composites.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2016
·
IF 2.74
Xue Wang,Mingjie Wang,Zhiyun Chen,Xiaoyi Tao,Weiguo Shen
The liquid-liquid equilibrium data and the specific heat capacities for the binary room temperature ionic solution {1-butanol + 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide} have been reported. The corresponding critical exponents β and α were obtained and found to be well coincided with the 3D-Ising criticality. The critical complete scaling theory was applied to successfully describe the asymmetric behavior of the diameter of the coexistence curve with the consideration of the heat capacity related term. The large values of the reduced critical density, the reduced critical temperature and the critical amplitude related to the heat capacity were deduced, which indicated a solvophobic criticality of the studied system.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Shimeles Addisu Kitte,Fuad Abduro Bushira,Tesfaye Refera Soreta
Efficient coreactants are of high importance in electrochemiluminescence sensing. Herein, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide was demonstrated as an effective coreactant for tris(2,2′-bipyridine)ruthenium(II) electrochemiluminescence system for the first time. The new electrochemiluminescence system showed a good sensing performance for H 2 O 2 on the basis of quenching of the electrochemiluminescence intensity. It allows the detection of H 2 O 2 in the dynamic range of 0.5–200 µM. The limit of detections for H 2 O 2 was 0.33 µM ( 3σ/m ). In addition, the developed ECL system exhibited satisfactory recoveries for H 2 O 2 sensing in real samples.
研究领域:
分析化学
·
生物传感
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产品关联
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2022
·
IF 3.705
Hong-Ru Zhao,Bing-Mei Su,Yi-Bing Shi,Juan Lin
Ethyl 3-hydroxy-3-phenylpropionate (EHPP), ( R )-EHPP or ( S )-EHPP, is an important chiral intermediate for pharmaceuticals. Its synthesis from ethyl benzoyl acetate (EBA) by alcohol dehydrogenase is regarded as a green method. However, scarcely any alcohol dehydrogenase has been reported competent in asymmetric synthesis of chiral EHPP at high EBA loading. Present study developed two robust and efficient bio-catalysts Mu-S2 and Mu-R4 for preparation of ( S )-EHPP and ( R )-EHPP respectively by rational design of alcohol dehydrogenase PcSDR from Pedobacter chitinilyticus based on molecular dynamics (MD) simulation analysis. BtGDH, a glucose dehydrogenase from Bacillus toyonensis catalyzing the oxidation of glucose for cofactor regeneration, was co-expressed with the screened mutants to form enzyme systems Mu-S2-BtGDH and Mu-R4-BtGDH. After reaction condition optimization, Mu-S2-BtGDH and Mu-R4-BtGDH were efficient in the synthesis of ( S )-EHPP (94% conv. and 99% e.e.) and ( R )-EHPP (99% conv. and 98% e.e. ) respectively in 100 mL scale under 500 mM of EBA loading in 10 h following a substrate continuous feeding mode. After purifying, the isolated yield for each EHPP enantiomer is > 93%. This work not only provides potential biocatalysts for the industrial production of ( R )-EHPP and ( S )-EHPP, but also enriches the constructure-function relationship of alcohol dehydrogenases.
研究领域:
生物化学
·
酶工程
·
药物化学
✓ 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）