CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Fenghua Geng,Rui Zhang,Luo Wu,Zheng Tang,Han Liu,Haiyan Liu,Zhichang Liu,Chunming Xu,Xianghai Meng
N -alkyl imidazolium carbonate ionic liquids were employed to separate and recover naphthenic acid from model oils. The effects of the cationic and anionic structures of ionic liquids and operating conditions on the deacidification performance were investigated. The deacidification performance of traditional organic solvents was also investigated for comparison. The results indicated that the naphthenic acid could be completely removed from the model oil with a small mass ratio of ionic liquid to oil. The extracted naphthenic acid was regenerated with a recovery of up to 92%. In addition, imidazolium carbonate ionic liquids could be successfully regenerated and recycled. The mechanism of interaction between imidazole ionic liquids and the naphthenic acid molecules were explained by Gauss calculation.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
·
IF 8.7
Shuai Zhu,Zhuoyu Li,Meiqi Yu,Qinghong Wang,Chunmao Chen,Jun Ma
The petroleum wastewater (PWW) contains a diverse range of recalcitrant organic contaminants . Of particular concern is the removal of naphthenic acids (NAs) due to the high toxicity and persistence. Persulfate (PS) based oxidation processes have shown promising in treating refractory wastewater, while the high costs of prepared catalysts limited their widespread implementation. This study aims to develop a cost-effective natural pyrite activated PS system for PWW treatment . The removal of NAs by pyrite/PS system was initially investigated. More than 90% of cyclohexanoic acid (CHA), a model NA, was removed in pyrite/PS system (2.0 g/L pyrite, 4.0 mM PS) at initial pH of 3–11. Scavenging experiments revealed that Fe(II) on pyrite surface was the reactive site for PS activation to generate reactive species, including sulfate radical (SO 4 ·− ), Fe(IV) and hydroxyl radical (·OH) for CHA degradation. Reactions of Fe(III) with S helped restore Fe(II) and enhance PS activation, resulting in the sustained catalytic activity of pyrites over five cycles. Cl − , SO 4 2− and NO 3 − below 10 mM had minimal impact on CHA degradation in pyrite/PS system. However, over 1 mM of HCO 3 − inhibited 80% of CHA removal due to the buffer effect to maintain the high solution pH. Removing HCO 3 − from real PWW restored the removal of CHA and of total organic carbon (TOC) to over 90% and 71.3% in pyrite/PS system, respectively. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) results indicated that O 2‒6 species including NAs were primarily eliminated through mineralization and oxygen addition. Besides, O 3 – 5 S, NO 3 – 5 S and N 3 O 2‒4 species were the most susceptible to oxidation in PWW, resulting in the increase of the oxidation level (i.e., O/C wa ) from 0.41 to 0.56 after treatment. This study provides valuable insights into the treatment of NAs in real PWW, and potential application of natural minerals in the treatment of industrial wastewater .
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2019
·Vol. 9
·期 18
·10024-10029
·
IF 3.049
Chunming Chen,Zhonghua Chen,Xingrong Zeng,Fei Yu
We herein report the preparation of phase change nanocapsules with undecanoic acid (UA) as the core and a styrene–butyl acrylate copolymer as the shell by miniemulsion polymerization using interfacial redox initiation. The morphology, particle size, thermal properties, and structure of the nanocapsules were characterized by transmission electron microscopy, differential scanning calorimetry, and thermogravimetric analysis. Further, the cotton fiber was dissolved in hydroxyl-functionalized ionic liquid 1-(3-chloro-2-hydroxypropyl)-3-methyl imidazolium chloride, and then the nanoencapsulated UA was immobilized on the cotton fiber by mixing the solution with the phase change nanocapsule emulsion. The desired thermoregulating fabrics were then recovered by vacuum suction filtration and drying, and their surface morphologies and thermoregulating properties were evaluated. The nanocapsules were found to be of a regular spherical shape with a diameter ranging from 90 to 110 nm, and they exhibit a phase change temperature of 29.3 °C. Finally, the prepared thermoregulating non-woven fabrics exhibited excellent thermal reliability, air permeability, and thermoregulating capability.
研究领域:
材料科学
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纺织工程
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DOI
高影响因子
Food Packaging and Shelf Life
·
2020
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IF 4.244
Shenyu Yang,Qiuju Miao,Yiping Huang,Peishan Jian,Xiaoping Wang,Mei Tu
Cinnamaldehyde (Ci) is a highly effective natural broad-spectrum antibacterial agent and preservative, but its strong volatility and short duration have a negative impact on its application in the field of agriculture and food. In order to improve these properties, porous PHA/CS microspheres were prepared by using polyhydroxyalkanoate (PHA) and chitosan (CS) as basic materials based on Poiseuille flow principle, and PHA/CS scaffolds were obtained by sintering the microspheres at low temperature. The effect of the ratio of PHA and CS on the particle size and charge of microspheres was studied. It was found that the particle size increased with the increase of the ratio of PHA and CS, while the surface charge changed from negative to positive. The SEM results showed that the microspheres exhibit a porous structure, and the CS adsorb on the surface of microspheres resulted in the reduction of surface pores. FTIR spectrum confirmed that there was only physical interaction between PHA and CS. PHA-based microspheres exhibited high encapsulation efficiency and loading capacity for Ci. Ci-loaded PHA-based microspheres and scaffolds had different release rates, and the release time can be adjusted in the range of 7–60 days. Antimicrobial activity and fruit preservation ability of the loaded Ci microspheres showed that it can effectively inhibit the growth of bacteria and extend the shelf life of the strawberry. This novel Ci carrier with good biocompatibility, biodegradability and adjustable release rate would have a broad application in the field of food preservation and antibacterial.
研究领域:
食品科学
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材料科学
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微生物学
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DOI
高影响因子
THERMOCHIMICA ACTA
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2024
·
IF 3.1
Huimin Yan,Fan Yang,Nan Yin,Yan Kou,Quan Shi
Adiabatic calorimetry is a reliable method for determining the purity of organic compounds, offering significant advantages over chromatography by eliminating the need for impurity separation. Despite its longstanding application, research in this area has been limited. This study comprehensively assessed the purity of tetradecanoic acid, n-heptadecane, and phenol using adiabatic calorimetry, comparing the results with those obtained through chromatography. The results demonstrated that tetradecanoic acid purity can be accurately measured, while n-heptadecane exhibited satisfactory repeatability in purity determination without sample separation in polycrystalline forms. Furthermore, the purity of phenol was effectively assessed using adiabatic calorimetry, where chromatography faced challenges. Overall, this study validates adiabatic calorimetry as a robust technique for organic compound purity determination and suggests avenues for further research in this domain.
研究领域:
化学
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分析化学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
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2024
·
IF 2.7
Yihan Cui,Huijie Feng,Xiaoqiao Xie
A new family of versatile water-enhanced adhesives based on hydrophobic polymers and amphiphilic alkanoic acids has been developed. These polymer gels form responsive surface bonding upon water exposure through softening effect and/or autonomous rearrangement of alkanoic acid molecules at the interface, thereby enhancing adhesion on both hydrophilic and hydrophobic, smooth and rough surfaces under wet conditions.
研究领域:
材料科学
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化学工程
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表面科学
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产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2012
·Vol. 75
·期 5
·289-296
·
IF 1.195
Zhang Yulin,Huang Liang,Chen Qinhua,Chen Zilin
A silica monolithic column chemically modified with l -pipecolic acid as chiral stationary phase has been developed for chiral separation of dansyl amino acids by capillary electrochromatography–mass spectrometry (CEC–MS). The monolithic column was prepared by a sol–gel process and subsequent chemical modification by l -pipecolic acid as chiral selector with 3-glycidoxypropyltrimethoxysilane as spacer. Interestingly, it was found that the l -pipecolic acid-modified monolithic column can hold copper(II) ions tightly after loading Cu(II) ions during column preparation and conditioning and allows CEC separation to be conducted based on chiral ligand exchange with MS detection by a mobile phase without copper ions. It has been demonstrated that the chiral monolithic column operates well for enantioseparation of several dansyl amino acids by CEC–MS.
研究领域:
分析化学
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药物化学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 17
·9327-9333
·
IF 2.936
Lei Meng,Jian-Hang Yin,Yaqing Yuan,Na Xu
A novel ratiometric fluorescence strategy is developed for specific detection of folic acid (FA) by using 11-mercaptoundecanoic acid protected gold nanoclusters (AuNCs@MUA). In this design, the fluorescence color of the probe can be switched among red, pink, violet and blue by varying the concentration of FA. AuNCs@MUA possesses strong fluorescence peaking at 612 nm (R-signal) and FA exhibits blue emissive auto-fluorescence at 446 nm (B-signal), showing a large emission shift of ∼170 nm. When AuNCs@MUA approaches FA through electrostatic binding, the R-signal decreases while the B-signal increases with titration of FA. Based on the above phenomenon, a radiometric analysis platform is constructed for FA target detection, with a wide linear response range from 0 to 20 μM, and an excellent detection limit of 26 nM. This new ratiometric strategy exhibits low background, and wide signal changes in a low concentration range, which presents obvious advantages over most previous FA detections based on single-responsive fluorescence methods. Furthermore, the proposed method is successfully applied to determine FA in human serum samples.
研究领域:
分析化学
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生物医学工程
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分子生物学
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DOI
高影响因子
ACS Applied Polymer Materials
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2023
·
IF 5
Kayode Hassan Lasisi,Kaisong Zhang
Crosslinked and additive-added polyamide thin-film composite (TFC) nanofiltration (NF) membranes formed by the conventional interfacial polymerization (IP) process have shown good performances. However, studies on polyamine TFC NF membrane prepared via an adjusted IP process with low-cost acid ligands as an interfacial additive for improved liquid-based separation are still lagging. In this regard, a polyamine-based TFC NF membrane synthesized by retarding the interfacial polymerization (IP) process with pyromellitic acid (PMA) (a polycarboxylate acid ligand) is herein reported. The PMA-adjusted membrane displayed a superb range of pure water fluxes from 9.8 to 20.4 L m–2 h–1 bar–1, with the best-performed membrane achieving up to 95.1% for Na2SO4 rejection. Thus, the water permeability of the PMA-TFC membrane is ∼2.4 times as high as the control TFC membrane. The best-performed PMA-TFC membrane showed good hydrophilicity, pressure resistance, and long-term filtration stability. In addition, the membrane structural stability was maintained with ∼3.9% declination in salt rejection after 30 days of immersion in 0.1 M HNO3 solution. Also, an impressive fouling resistance was achieved after three-cycle of bovine serum albumin fouling tests. This work, therefore, offers a more feasible way of designing polyamine-based NF membranes with good prospects in water reuse and nitric acid-generating wastewater treatment application.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
PLoS One
·
2024
·Vol. 19
·期 7
·e0306222
·
IF 2.9
Manyu Tang,Xin Zhen,Guoqiang Zhao,Shuang Wu,Wei Hua,Jingwen Qiang,Cheng Yanling,Wanqing Wang
The purple nonsulfur bacteria, Rhodospirillum rubrum , is recognized as a potential strain for PHAs bioindustrial processes since they can assimilate a broad range of carbon sources, such as syngas, to allow reduction of the production costs. In this study, we comparatively analyzed the biomass and PHA formation behaviors of R . rubrum under 100% CO and 50% CO gas atmosphere and found that pure CO promoted the PHA synthesis (PHA content up to 23.3% of the CDW). Hydrogen addition facilitated the uptake and utilization rates of CO and elevated 3-HV monomers content (molar proportion of 3-HV up to 9.2% in the presence of 50% H 2 ). To elucidate the genetic events culminating in the CO assimilation process, we performed whole transcriptome analysis of R . rubrum grown under 100% CO or 50% CO using RNA sequencing. Transcriptomic analysis indicated different CO 2 assimilation strategy was triggered by the presence of H 2 , where the CBB played a minor role. An increase in BCAA biosynthesis related gene abundance was observed under 50% CO condition. Furthermore, we detected the α-ketoglutarate (αKG) synthase, converting fumarate to αKG linked to the αKG-derived amino acids synthesis, and series of threonine-dependent isoleucine synthesis enzymes were significantly induced. Collectively, our results suggested that those amino acid synthesis pathways represented a key way for carbon assimilation and redox potential maintenance by R . rubrum growth under syngas condition, which could partly replace the PHA production and affect its monomer composition in copolymers. Finally, a fed-batch fermentation of the R . rubrum in a 3-l bioreactor was carried out and proved H 2 addition indeed increased the PHA accumulation rate, yielding 20% ww -1 PHA production within six days.
研究领域:
微生物学
·
生物工程
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产品关联
DOI
PubMed
高影响因子
Evidence-based Complementary and Alternative Medicine
·
2022
·
IF 2.65
Leying Xi,Fuqiong Zhou,Wenxiu Ji,Weina Zhu,Jie Ruan,Yajie Zhang,Xueling Hu,Hongyan Long
Objective. Tourette syndrome (TS) is a chronic neuropsychiatric disorder characterized by abnormal movements, phonations, and tics, but an accurate TS diagnosis remains challenging and indeed depends on its description of clinical symptoms. Our study was conducted to discover and verify some metabolite biomarkers based on nontargeted and targeted metabolomics. Methods. We conducted untargeted ultrahigh-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF/MS) for preliminary screening of potential biomarkers on 30 TS patients and 10 healthy controls and then performed validation experiments based on targeted ultrahigh-performance liquid chromatography triple quadrupole-MS (UHPLC/MS/MS) on 35 TS patients and 14 healthy controls. Results. 1775 differentially expressed metabolites were identified by partial least squares discriminant analysis (PLS-DA), fold-change analysis, T-test, and hierarchical clustering analysis (adjusted value <0.05 and |logFC| > 1). TS plasma samples were found to be differentiated from healthy samples in our approach. Furthermore, aspartate and asparagine metabolism pathways were considered to be a significant enrichment pathway in TS progression based on metabolite pathway enrichment analysis. For the 8 metabolites involved in this pathway that we detected, we then performed validation experiments based on targeted UHPLC/MS/MS. The t-test, Mann–Whitney U test, and receiver operating characteristic (ROC) curve analysis were used to determine potential biomarkers. Ultimately, L-arginine and L-pipecolic acid were validated as significantly differentiated metabolites (), with an AUC of 70.0% and 80.3%, respectively. Conclusion. L-pipecolic acid was defined as a potential biomarker for TS diagnosis by the combined application of nontargeted and targeted metabolomic analysis.
研究领域:
医学
·
神经科学
·
代谢组学
✓ 已验证
DOI
PubMed
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Lei Wang,Yusen Yang,Shuyue Song,Yawen Shi,Weimin Da,Zhaowei Tian,Yuan Deng,Meng Zhang,Xin Zhang,Lirong Zheng,Tianwei Tan,Min Wei
Deoxygenation of biomass-derived fatty acids is a renewable and effective route for the production of diesel-range alkanes and fine chemicals; however, a high selectivity toward a single-target product is rather challenging. Herein, a Ni4Fe1 alloy catalyst was prepared via topological transformation of hydrotalcite precursor, which was featured with an interface structure (Niδ+–Feδ−) originating from electron transfer from Ni to Fe. The Ni4Fe1 catalyst shows a switchable product selectivity in hexadecanoic acid hydrogenation reaction by using different solvents: hexadecanol (yield: 97%) is obtained with dioxane as a solvent, whereas pentadecane (yield: 98%) is attained with dodecane as a solvent. In addition, in the presence of a physical mixture catalyst containing Ni4Fe1 and ZSM-5 (1:9, m/m) with dodecane as a solvent, hexadecane (yield: 94%) is obtained. A comprehensive study including temperature-programmed surface reaction with a mass spectrometer (TPSR-MS), in situ Fourier transform infrared (FT-IR), molecular dynamics simulations, and density functional theory (DFT) calculations reveals that hexadecanol serves as the key intermediate that determines the final product through different transformation pathways. High-binding energy between hexadecanol and dioxane solvent induces the desorption of hexadecanol from the Ni4Fe1 catalyst surface as the final product; in contrast, weak interaction between hexadecanol and dodecane solvent results in the subsequent decarbonylation (C–CO* bond cleavage) of intermediate on the surface of Ni4Fe1 with pentadecane as the final product (a cascade reaction on the same catalyst). In the case of the mixture catalyst, a cascade reaction on different catalysts is established: the hexadecanol intermediate undergoes desorption from Ni4Fe1, experiences activation adsorption, and C–O bond cleavage at the Brønsted acid site on ZSM-5, which leads to the final product hexadecane. This work provides an efficient product-switching strategy in biodiesel synthesis that is enabled by a subtle control over the pathway of key intermediate, which is expected to be applied in the catalytic conversion of biomass resources.
研究领域:
催化化学
·
可再生资源转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）