BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Zhen Wu,Xinxu Zhao,Jun Zhang,Xun Li,Yu Zhang,Fei Wang
In this study, a mixture solvent of ethanol/1,4-dioxane/formic acid (FA) is firstly reported to efficaciously depolymerize industrial lignin to produce high-value added phenolic monomers, in which 1,4-dioxane acts as lignin solvent, ethanol acts as solvent, reactant and in situ hydrogen donor, and FA acts as acid catalyst and in situ hydrogen donor. The effects of solvent composition and reaction conditions on the lignin conversion and product yields were explored, resulting in a low residue yield of 6.57% and a high phenolic monomers yield of 22.4% at 300 °C for 2 h when Kraft lignin was depolymerized in the mixture solvent of ethanol/1,4-dioxane/FA (10:10:2, v/v). Moreover, possible reaction mechanism on lignin depolymerization in the mixture solvent was illustrated, suggesting a favorable synergistic effect among the three components of the mixture solvent. In addition, the satisfactory applicability of the mixture solvent was approved through the feedstock adaptability and recyclability experiments.
研究领域:
化学工程
·
可再生资源与环境科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Da Ouyang,Jingchun Yan,Linbo Qian,Yun Chen,Lu Han,Anqi Su,Wenying Zhang,Hao Ni,Mengfang Chen
Nano magnetite biochar composite (nFe 3 O 4 /biochar) was synthesized and used to activate persulfate for the degradation of 1,4-dioxane. Analytical techniques using X-ray diffraction (XRD), fourier transform infrared analysis (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) indicated that nFe 3 O 4 was spherical and successfully loaded onto the surface of biochar. The results of batch-scale experiments illustrated that the 1,4-dioxane degradation efficiency in aqueous phase was 98.0% after 120 min reaction with the composite mass ratio of 1:1 between nFe 3 O 4 and the pine needle biochar pyrolyzed at 400 °C (P400) under the initial neutral pH. An electron paramagnetic resonance (EPR) study, free radical quenching experiment and XPS analysis were undertaken to illustrate the mechanism of persulfate activation by nFe 3 O 4 /biochar. Under acidic and neutral conditions, the predominant free radical was SO 4 − whereas OH and SO 4 − predominated when the initial pH was 9.0. The XPS analysis indicated that Fe(II) and oxygenated functional groups activated persulfate. In addition, carbon-carbon double bonds would be transformed into ketone and quinone which could activate persulfate during the reaction.
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
·
2023
·
IF 15.1
Yujia He,Rui Zhang,Weipeng Song,Huai Liu,Junhua Zhang,Wenlong Jia,Lincai Peng
The simultaneous valorization of biomass-based C5 and C6 sugars to furfural, a versatile intermediate, is of great significance to fully utilize biomass components. Inability to effectively transform C6 sugars remains a major barrier toward this challenging goal. We herein report the 1,4-dioxane-mediated solvent system with Hβ zeolite catalyst for the transformation of glucose giving high yield to furfural (57%). The maintenance of intrinsic balanced Lewis and Brønsted acid sites from Hβ zeolite that is credited to the positive solvent effect of 1,4-dioxane is highly conductive to the selective C-C bond cleavage of glucose. Also importantly, the introduction of proper amount of H 2 O into the reaction system results in a high formation rate and an improved selectivity toward furfural due to the induction of highly reactive acyclic glucose. Glucose-to-furfural through 3-deoxyglucose should be more favorable than that via fructose. Impressively, the developed protocol can also be adapted to C5 sugars dehydration, and the one-pot conversion of glucose and xylose mixtures gains a furfural yield as high as 63%. The activation energy barrier for furfural production is higher from glucose compared to xylose. This work not only develops a promising protocol for furfural production simultaneously from C5 and C6 sugars but also provides insights into the mechanistic role of the solvent 1,4-dioxane to availably manipulate the acid-catalyzed conversion of C6 sugars.
研究领域:
生物化学
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催化化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 27
·27274-27282
·
IF 2.8
Luo Jingyang,Zhang Qin,Wu Lijuan,Cao Jiashun,Feng Qian,Fang Fang,Chen Yinguang
1,4-Dioxane is an emerging pollutant, which widely exists in natural environments and poses potential risks to the living organisms. However, its effect on the denitrification process is still unknown. In this study, the effects of 1,4-dioxane on the denitrification process were therefore investigated by using Paracoccus denitrificans as the model denitrifier. The obtained results showed that the exposure of 1,4-dioxane exhibited remarkable lag or inhibition on the denitrification process, especially with high dose. In the control without 1,4-dioxane exposure, Paracoccus denitrificans showed high denitrification efficiency (98.5%). However, the efficiency decreased to 78.5, 63.9, and 9.3% with 0.50, 0.75, and 1.0% ( v / v ) 1,4-dioxane dose, respectively. The dose-induced inhibition of denitrification by 1,4-dioxane could be partially attributed to the negative effects on proliferation and viability of functional microorganisms by conjugating and disrupting the cell membranes. Furthermore, 1,4-dioxane caused biotoxicity to the intracellular activities of denitrifiers via disturbing carbon source utilization and interfering the key enzymes responsible for glycolysis. The decrease of microbial viability and activity inevitably resulted in the decline of key enzymes (NAR, NIR, NOR, and N 2 OR) closely related with denitrification process, which could be the direct reason for the decrease of denitrification performance.
研究领域:
环境生物学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 19
·7968-7975
·
IF 3.288
Tao Yang,Wenzhi Li,Mingxue Su,Yang Liu,Minghou Liu
A novel carbon-based solid acid catalyst (SC-GCa-800) was prepared by the carbonization of calcium gluconate at high-temperature followed by sulfonation with 4-diazoniobenzenesulfonate at room temperature. The catalyst was characterized by FT-IR, XPS, TEM, SEM, TGA, N2 adsorption–desorption and elemental analysis to reveal its physical and chemical properties. Furthermore, the effects of reaction temperature, retention time, substrate concentration, catalyst loading and solvent types were investigated. It was demonstrated that SC-GCa-800 is an efficient solid acid catalyst for furfural production obtained from xylose in 1,4-dioxane. A 76.9% furfural yield can be achieved from 100 mg xylose at 140 °C in 40 min by using a 50 mg catalyst. The catalyst showed high stability and could be recycled five times without a significant loss of catalytic activity. The results indicated that the high catalytic activity of SC-GCa-800 was dependent on its high acidity, BET surface and pore structure. More importantly, the furfural can be obtained at low temperature (100–140 °C) and separated easily from the solvent due to the low boiling point of 1,4-dioxane.
研究领域:
化学工程
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 15
·7299-7304
·
IF 3.3
Xiaoqian Chang,Yuepeng Wang,Yanfei Zhao,Ying Wang,Rongxiang Li,Zhengang Ke,Penglei Chen,Zhimin Liu
1,4-Dioxane and its derivatives are a class of important chemicals, which can be produced via dehydrative cyclization of vicinal diols catalyzed by acid or Lewis acid catalysts, but generally suffer from their inherent shortcomings. Herein, we report a hydrogen-bonding catalyzed approach for the synthesis of 1,4-dioxanes from vicinal diols in ionic liquids under metal-free conditions. The ILs possessing a cation hydrogen-bond donor and an anion hydrogen-bond acceptor (e.g., 1-hydroxyethyl-3-methyl imidazolium trifluoromethanesulfonate, [HO-EtMIm][OTf]) were found to be effective for the reaction. In particular, [HO-EtMIm][OTf] showed the best performance among the tested ILs, even better than H2SO4, affording a series of 1,4-dioxanes in high yields and excellent selectivity under mild conditions (e.g., 120 °C). The mechanism investigation indicates that the IL cation and anion as the hydrogen-bond donor and acceptor, respectively, can activate the C–O and O–H bonds of diols via hydrogen-bonding, which synergistically realizes the dehydrative cyclization of vicinal diols to generate 1,4-dioxanes. In addition, this IL could be reused 5 times without activity loss. This work provides a simple, green route to produce 1,4-dioxanes, which may have promising applications.
研究领域:
有机化学
·
绿色化学
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产品关联
DOI
高影响因子
Journal of Orthopaedic Translation
·
2017
·
IF 0
Ling Li,Jing Long,Long Li,Huijuan Cao,Tingting Tang,Xinghua Xi,Ling Qin,Yuxiao Lai,Xinluan Wang
Summary Background/Objective A novel porous scaffold poly (lactide- co -glycolide) and tricalcium phosphate (PLGA/TCP) was developed by three-dimensional printing technology for bone defect repair. As a Class 2 solvent with less severe toxicity, content of residual 1,4-dioxane in this newly developed scaffold should be rigorously controlled when it is translated to clinical use. In this study, a headspace gas chromatography-mass spectrometric (HS-GC-MS) method and related testing protocol were developed for quantitative determination of 1,4-dioxane in the PLGA/TCP composite scaffolds. Methods Matrix effect analysis was used to optimise the pretreatment method of the scaffolds. Then, the procedure for testing 1,4-dioxane using HS-GC-MS was set up. The accuracy, precision, and robustness of this newly developed quantitative method were also validated before quantification of 1,4-dioxane in the scaffolds with different drying procedures. Results Dimethyl formamide (DMF) was the optimal solvent for dissolving scaffolds for GC-MS with proper sensitivity and without matrix effect. Then, the optimised procedure was determined as: the scaffolds were dissolved in DMF and kept at 90°C for 40 minutes, separated on a HP-5MS column, and detected by mass spectroscopy. Recovery experiments gave 97.9–100.7% recovery for 1,4-dioxane. The linear range for 1,4-dioxane was determined as 1–40 ppm with linear correlation coefficient ≥ 0.9999. Intraday and interday precision was determined as being within relative standard deviation of below 0.68%. The passable drying procedure was related to lyophilising (−50°C, 50 Pa) the scaffolds for 2 days and drying in vacuum (50 Pa) for 7 days. Conclusion This is the first quantitative method established to test 1,4-dixoane in a novel scaffold. This method was validated with good accuracy and reproducibility, and met the methodological requirements of the Guideline 9101 documented in the Chinese Pharmacopoeia 2015 Edition. The translational potential of this article This quantitative method for determination of residual 1,4-dioxane in the novel scaffolds is a key technical method during its translation into clinical use because this method is an important and indispensable file in the enterprise standard when the porous scaffold is registered as a Class III implanted medical device for bone defect repair, which is used to guarantee the safety of the scaffolds. It is also applied to optimise the drying process of scaffolds and to monitor the quality of scaffolds in the industrialisation process. Further, this method provides references for other solvents quantitative determination in porous scaffolds or materials.
研究领域:
生物材料学
·
分析化学
·
医学工程
✓ 已验证
DOI
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jingdong Yang,Yu Li,Zequn Yang,Kaimin Shih,Guang-Guo Ying,Yong Feng
The presence of 1,4-dioxane in various water streams poses a threat to the health of human beings. In this study, the oxidative combination of ozone with peroxymonosulfate (PMS) was for the first time used to remove 1,4-dioxane from water. Near complete abatement of 1,4-dioxane was achieved by ozone-PMS after reaction of only 15 min and the degradation kinetics was found to be positively correlated with doses of PMS and ozone. Ozone-PMS oxidation had the optimum performance at slight base pH values. Both sulfate radicals and hydroxyl radicals were generated in ozone-PMS oxidation and these radicals resulted in the degradation of 1,4-dioxane. The effects of common water constituents and real water matrices were investigated. It was found that bicarbonate ions with a concentration up to 10 mM had a slight promoting effect, while either chloride ions or natural organic matter inhibited only slightly the degradation. Meanwhile, no obvious difference in the degradation of 1,4-dioxane was found among the real water matrices and deionized water , which demonstrates that ozone-PMS oxidation has high tolerance and stability. The results from this study demonstrate that ozone-PMS may be a promising technology for the removal of 1,4-dioxane from various water matrices.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
TETRAHEDRON LETTERS
·
2012
·
IF 2.683
Gong-Qing Liu,Wei Li,Yu-Mei Wang,Zhen-Ying Ding,Yue-Ming Li
Zinc halide-promoted hydroamination of 4-penten-1-amine compounds was studied. Preliminary results indicated that both steric and electronic factors are crucial for this Lewis acid-promoted reaction. ZnI 2 gave the most promising results and the reactivity could be further increased upon addition of a suitable ligand. Up to 95% isolated yields were obtained when the reactions were carried out in 1,4-dioxane in the presence of 10 mol % of ZnI 2 and 8-hydroxyquinoline.
研究领域:
有机化学
·
催化反应
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Weipeng Song,Rui Zhang,Huai Liu,Junhua Zhang,Wenlong Jia,Lincai Peng
Direct and efficient conversion of abundant renewable biomass carbohydrates to 5-ethoxymethylfurfural (EMF), a potential biofuel candidate, is highly desirable but remains challenging. We report here the catalytic transformation of glucose using hybrid Hβ and USY zeolites in 1,4-dioxane-contained ethanol solution, leading to EMF production with an excellent yield of 60 % within 1 h. Hybrid zeolites rational modulate the chemical space, acidity, and acid sites synergistically to drive the imperative cascade reactions during the conversion. Equally important, the introduction of low-polarity aprotic 1,4-dioxane co-solvent can effectively stabilize the obtained EMF because the preferential solubilization of EMF by 1,4-dioxane resulted in a reduction of their nucleophilic charge, which in turn lowers its susceptibility to nucleophilic attack and minimizes the undesirable reactions. This work not only develops a promising protocol for EMF production from glucose but also sheds light on the mechanistic role of hybrid zeolites and 1,4-dioxane co-solvent in the cascade transformation.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 4
·389
·
IF 3.444
Xiyan Xu,Shuming Liu,Yong Cui,Xiaoting Wang,Kate Smith,Yujue Wang
Increasing demand for fresh water in extreme drought regions necessitates potable water reuse. However, current membrane-based water reclamation approaches cannot effectively remove carcinogenic 1,4-dioxane. The current study reports on the solar-driven removal of 1,4-dioxane (50 mg L−1) using a homemade WO3/nγ-Al2O3nano-catalyst. Characterization methods including scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray fluorescence (XRF) analyses are used to investigate the surface features of the catalyst. The 1,4-dioxane mineralization performance of this catalyst under various reaction conditions is studied. The effect of the catalyst dosage is tested. The mean oxidation state carbon (MOSC) values of the 1,4-dioxane solution are followed during the reaction. The short chain organic acids after treatment are measured. The results showed that over 75% total organic carbon (TOC) removal was achieved in the presence of 300 mg L−1of the catalyst with a simulated solar irradiation intensity of 40 mW cm−2. Increasing the dose of the catalyst from 100 to 700 mg L−1can improve the treatment efficiency to some extent. The TOC reduction curve fits well with an apparent zero-order kinetic model and the corresponding constant rates are within 0.0927 and 0.1059 mg L−1s−1, respectively. The MOSC values of the 1,4-dioxane solution increase from 1.3 to 3 along the reaction, which is associated with the formation of some short chain acids. The catalyst can be effectively reused 7 times. This work provides an oxidant-free and energy saving approach to achieve efficient removal of 1,4-dioxane and thus shows promising potential for potable reuse applications.Keywords:1,4-dioxane;photocatalysis;WO3/nγ-Al2O3;solar radiation;water treatment;potable reuse
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Yong Feng,Guang-Guo Ying,Zequn Yang,Kaimin Shih,Hailong Li,Deli Wu
Cobalt is part of vitamin B12, which is essential to maintain human health, and trace levels of cobalt ions are ubiquitous in water and soil environments. In this study, the destruction of 1,4-dioxane (1,4-D) by peroxymonosulfate (PMS) under the catalysis of trace levels of Co 2+ was investigated under buffered conditions. The results showed that near 100% removal of 1,4-D was achieved after reaction for 6 and 10 min with 50 and 25 μg/L Co 2+ , respectively, in the presence of 5 mM phosphate ions. Mechanism studies revealed that radicals mediated the destruction of 1,4-D and sulfate radicals were the primary reactive species. The traces of Co 2+ had the greatest reactivity for the catalysis of PMS in neutral environments (pH 7.0). However, pH 5.5 was observed to be the best condition for 1,4-D destruction, which was probably caused by the involvement of phosphate radicals. Common water components including chloride ions and bicarbonate ions were observed to have promoting and inhibiting effects, respectively, on the removal of 1,4-D. To further demonstrate the potential of Co 2+ -PMS in practical applications, we explored the simultaneous degradation of 20 antibiotics using trace levels of Co 2+ . The results showed that all the investigated antibiotics, except for lomefloxacin, could be efficiently degraded by Co 2+ -PMS with removal rates of greater than 97%. The findings from this study demonstrate the promise of using trace levels of cobalt for environmental remediation applications, even when high concentrations of phosphate ions are co-present.
研究领域:
环境科学
·
化学
·
水处理工程
✓ 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）