Biomass Conversion and Biorefinery
·
2021
·Vol. 12
·期 8
·3503-3511
·
IF 4.987
Huang Xin,Xu Anbang,Bu Xinyuan,Huang Yong,Ran Jingyu
Levoglucosenone (LGO), derived from catalytic pyrolysis of cellulose, has shown its potential as a bio-renewable platform for the production of fine and commodity chemical. In this study, we report a biphasic system for conversion of LGO to 5-hydroxymethylfurfural (HMF) and levulinic acid (LA) with a substantial yield. The hydrolysis parameters, including single-biphasic phase, catalyst, temperature, and reaction time, were investigated on LGO conversion, respectively. The results showed that NaCl/H 2 O-MIBK biphasic system led to a profoundly increase of HMF selectivity by 37% compared to aqueous phase. An increase of acid site significantly enhanced LGO conversion and meanwhile promoted overreaction of HMF to LA and humins. Thus, HMF yield was observed firstly increased and then decreased with a maximum yield of 53.6% by using oxalic acid as a catalyst. The biphasic system effectively suppressed the humins formation and resulted in a maximum total HMF and LA yield of 86.7%.
研究领域:
化学工程
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可再生资源利用
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DOI
高影响因子
Journal of Environmental Sciences
·
2019
·
IF 3.556
Hanlu Shi,Rui He,Lei Sun,Gang Cao,Xiangjuan Yuan,Dongsheng Xia
A series of functional organic–metal AgCl-decorated graphitic carbon nitride (AgCl-CN x ) composites were synthesized and applied for the degradation of oxalic acid (OA) under visible light. The highest photocatalytic activity was achieved with AgCl decoration ratio of 1.0 (denoted as AgCl-CN 1.0 ). The pseudo-first-order constant for OA degradation was 0.0722 min −1 with the mineralization efficiency of 90.80% after 60 min reaction in the photocatalytic process with AgCl-CN 1.0 . A variety of characterization techniques including Brunauer–Emmett–Teller, X-ray diffraction, scanning electron microscope , transmission electron microscopy , X-ray photoelectron spectroscopy, Fourier transform infrared spectra , ultraviolet–visible diffuse reflectance spectra, photoluminescence , and Mott–Schottky were utilized to elucidate the physicochemical, microstructure, and optical properties contributing to the improvement of the photocatalytic performance. The results showed that AgCl-CN 1.0 had an oblate flaky erythrocyte-like structure with a moderate band gap energy of ~ 3.00 eV. In addition, the effects of the key parameters (i.e., AgCl-CN 1.0 dosage, initial OA concentration, solution pH, and presence of natural organic matter) on OA degradation were systematically investigated. Radical scavenger experiments indicated that photogenerated holes, electrons, superoxide anion radicals, and hydroxyl radicals were the dominant reactive species. Moreover, AgCl-CN 1.0 exhibited excellent stability and reusability for OA degradation without detectable Ag + release in the solution over multiple reaction cycles. The efficient OA mineralization could be mainly ascribed to the moderate specific surface area, increased numbers of active sites, and effective interfacial charge transfer of AgCl-CN 1.0 . Overall, the AgCl-CN 1.0 composite was demonstrated to be a highly efficient, stable, and recoverable photocatalyst.
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
PubMed
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 15
·2777-2790
·
IF 3.756
Fan-Zhi Bu,Yue-Ming Yu,Yu-Li Shen,Lu Liu,Cui-Wei Yan,Zhi-Yong Wu,Yan-Tuan Li
The current research takes advantage of the low solubility and hepatoprotective activity of the phenolic acid nutrient vanillic acid (VAA) to reduce the solubility and dissolution rate of the antifungal drug 5-fluorocytosine (FCY) via a cocrystallization strategy, thus gaining new insights into surmounting the dose-limited hepatotoxicity caused by the rapid and almost complete absorption of FCY. An FCY-phenolic acid nutraceutical cocrystal, namely, FCY–VAA–H2O, was directionally self-assembled and structurally characterized. The single-crystal X-ray structural analysis showed that water and VAA molecules occupy the polar sites of FCY in situ through strong hydrogen-bonding interplays, establishing a key plane structure (KPS) with hydrophobicity, which down-regulates the solubility and dissolution rate of the cocrystal as compared with FCY itself. The conclusion is supported by systematic theoretical studies. Molecular electrostatic potential (MEP) calculations revealed a polarity decrease in KPS in the cocrystal relative to free FCY, in accordance with the polarity diminution induced by intensive hydrogen-bonding energy, through the reduced density gradient (RDG) analysis, implying an obvious potentiation in hydrophobicity. Thereby, the theoretical calculations achieved positive correlations with the experimental measurements.
研究领域:
药学
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分子生物学
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理论化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Ruxin Peng,Jihai Shao,Yuanlin Xie,Anwei Chen,Liang Peng,Qingru Zeng,Si Luo
Being that the influence of organic ligands on contaminant removal by nanoscale zero valent iron (nZVI) has been explored in quite a few studies, there is little information on reaction mechanisms of the ZVI-ligand system under different aeration conditions. The degradation of nitrobenzene (NB) by nZVI-oxalic acids (OA) was investigated under N 2 , O 2 and without aeration conditions. From the findings, it was evident that OA dramatically improved NB degradation by nZVI with all of the aeration conditions. Approximately 100% of NB was degraded by nZVI-OA+N 2 system after 60 min of reaction, followed in effectiveness by nZVI-OA+ without aeration (95%) as well as nZVI-OA+O 2 (85%). Operation parameters including OA concentration and pH had significant effect on the removal of NB in the nZVI-OA system. 3 mM OA concentration and pH 3.0 were found to be favourable. The Fe 2+ , total dissolved iron concentrations, pH and ORP values in the nZVI-OA systems had also been monitored. Intermediates and trapping experiments showed that reduction played a fundamental role in the NB degradation by nZVI-OA under N 2 or without aeration conditions. The formation of Fe(OA) 0 and Fe(OA) 2 2− complexes had lower standard ORP, which could improve the strength of reductant in the systems, and thus resulting in an increased degradation efficiency of NB by nZVI-OA+N 2 . Under O 2 aeration condition, the NB degradation process could be regarded as an oxidation . In the meantime, OA promoted the production of reactive oxidants species by speeding up the oxidation rates of Fe 2+ by O 2 and H 2 O 2 . Summarily, the improved reactivity of nZVI was largely as a result of the strong complexation ability of OA.
研究领域:
环境科学
·
化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 11
·5206-5217
·
IF 3.925
Yajie Wang,Xianhe Gong,Xin Dong,Xiuzhen Tao,Yingchun Luo
In this study, the kinetics of arsenite (As(III)) removal in a ferrihydrite/oxalate system under irradiation was investigated, and the effects of pH, ferrihydrite dosage, As(III) initial concentration, and oxalate concentration were evaluated. Ultraviolet A (UVA) irradiation significantly promoted As(III) removal in the presence of ferrihydrite and oxalate. The greatest removal efficiency of As(III) (92.5%) was observed under the following conditions: pH 3.0, 100.0 μg L−1 As(III), 0.0125 g L−1 ferrihydrite, 0.1 mmol L−1 oxalate, and after 90 min under UVA irradiation. The removal of As(III) in the ferrihydrite/oxalate system was strongly pH-dependent. Mechanistic investigations indicated that HO˙ was the primary oxidant for As(III) photo-oxidation in the ferrihydrite/oxalate system. Surface adsorbed hydroxyl radical (HOads˙) was the dominant oxidant over the entire pH range in the presence of oxalate, and the hydroxyl radical in aqueous solution (HOaq˙) made only a small contribution under acidic conditions. The sources of HO˙ were also strongly dependent on pH; HO2˙/O2˙− was the precursor of HO˙ under acidic conditions, while photo-generated holes gradually became the main source of HO˙ as the pH increased. The photo-oxidation of As(III) mainly occurred on the surface of ferrihydrite. Although some ferrihydrite transformed into goethite during the removal process, the iron oxides showed good reusability for up to five regeneration cycles. The findings indicate that As(III) can be efficiently removed by the ferrihydrite/oxalate system and provide guidance for developing effective treatment strategies for As(III)-contaminated waters.
研究领域:
环境科学
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化学
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产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2021
·
IF 6.475
Qing Li,Mengyue Xu,Yunyi Yang,Jian Guo,Zhili Wan,Xiaoquan Yang
Novel supramolecular nanofibrils assembled from food-grade saponin glycyrrhizic acid (GA) are effective building blocks to make complex multiphase systems, e.g., emulsion foams. In this work, the effects of different oil phases (castor oil, sunflower oil, dodecane, and limonene) on the formation, stability and structural properties of long-lived emulsion foams prepared by GA nanofibrils (GNs) were investigated. The obtained results showed that soft-solid emulsion foams (4 wt% GNs) can be fabricated, independently of oil phase, and their structural properties, viscoelasticity, and tribological properties can be well tuned by oil phase polarity. Compared to the GNs aqueous foams, the presence of jammed emulsion droplets in the liquid channels and at the surfaces of bubbles can provide a higher bubble stability for emulsion foams. For more polar oil phase (castor oil), GNs showed a higher affinity to the oil–water interface with a lower interfacial tension, thus forming smaller oil droplets and bubbles, which leads to the higher mechanical strength, denser network microstructures, and lower friction coefficients of emulsion foams. However, the limonene foam exhibited weak storage stability and rheological properties, as well as the relatively low lubrication, which may be related to the formation of oil droplet aggregates and clusters induced by the volatility of limonene. GN-based emulsion foams are thermoresponsive, independently of oils, and the temperature-switchable process for the destabilization and regeneration of foams can be controlled and repeated. These emulsion foams based on natural saponin nanofibrils with tunable properties have potential sustainable applications in foods, pharmaceuticals, and personal care products.
研究领域:
食品科学
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材料科学
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界面化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Qingyang Luan,Han Hu,Xiaoyu Jiang,Chen Lin,Xiaoqin Zhang,Qianfeng Wang,Yunxiao Dong,Jinggang Wang,Jin Zhu
Marine plastic pollution , with annual emissions into the marine over 53 million metric tons, has been a major worldwide concern. Many of so-called “biodegradable” polymers degrade very slowly in seawater. Oxalate have attracted attention because the electron-withdrawing effect of adjacent ester bonds promotes their natural hydrolysis, particularly in the ocean. However, the low boiling point and poor thermal stability of oxalic acids severely limits their applications. The successful synthesis of light-colored poly(butylene oxalate-co-succinate) (PBOS), with weight average molecular weight higher than 1 × 10 5 g/mol, displays the breakthroughs in the melt polycondensation of oxalic acid-based copolyesters. The copolymerization of oxalic acid retains the crystallization rate of PBS, with minimum half-crystallization times from 16 s (PBO 10 S) to 48 s (PBO 30 S). PBO 10 S-PBO 40 S exhibit good mechanical properties with elastic modulus of 218–454 MPa, and tensile strength between 12 and 29 MPa, better than packaging materials such as biodegradable PBAT and non-degradable LLDPE . PBOS achieve rapid degradation in the marine environment, with a mass loss 8%− 45% after 35 days. The characterization of structural changes demonstrate that the introduced oxalic acid plays a key role in the process of seawater degradation. This new class of polymers therefore provide highly promising materials for sustainable packaging with unique seawater degradation properties.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qingqing Chai,Jiahan Dong,Xiaofang Yu,Xiaoke Zhang,Jun Li,Sheng Guo,Yiling Yang
Photocatalytic oxalic acid (OA) activation for pharmaceutical wastewater degradation based on Fe-based catalysts are usually limited by the cycle of Fe 3+ /Fe 2+ and low conversion efficiency of OA. Herein, an effective OA activator, FeOOH loaded FeWO 4 /WO 3 (FFW) heterojunction photocatalyst, were fabricated by electrostatic self-assembly for tetracycline (TC) degradation. Experimental results revealed that the introduction of FeOOH can greatly enhance the optical absorption and separation efficiency of photogenerated carriers of the FeWO 4 /WO 3 (FW) composite. Moreover, optimized FFW heterojunction exhibited the excellent photocatalytic OA activation activity and the highest OA conversion rate for TC degradation, which exhibited 97.3% photocatalytic performance for TC within 30 min under 420 nm light irradiation. The FFW heterojunction still revealed high photocatalytic OA activation activity for TC degradation even after six cycles. The possible degradation pathway of TC and photocatalytic OA activation mechanism of FFW heterojunction were also presented by ESR spectroscopy results, quenching tests, and LC-MS analysis. This work not only provides a fresh perspective on the surface photo-Fenton chemistry of catalytic redox processes, but also presents a valid reference for designing highly efficient photocatalytic OA-activation systems for pharmaceutical wastewater treatment .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Mei-yuan Li,Zhi-peng Jia,De-min Li,Man-ping Luo,Ying-ying Meng,Kang- xu Wang,Bei Wang,Bing Liu,Xin-guo Zhang,Qin Li
Glycyrrhizic acid (GA) and glabridin (GD) are very important sweeteners and whitening agents present in Glycyrrhiza glabra L. This study investigates the cellulase and pectinase produced by endophytes in G. glabra to optimize and enhance the extraction of GA and GD from licorice using enzyme-assisted extraction (EAE) and microbial co-culture-assisted extraction (MCAE) approaches. Twelve strains with cellulase and pectinase activities were isolated from G. glabra. Notably, the strain G1–5, preliminarily identified as Penicillium sp., demonstrated superior performance in enzyme production and extraction efficiency of GA. Compared to the traditional extraction methods, the EAE process showed an obvious improvement of 32.21% and 56.37% in GA and GD extraction rates, respectively. Similarly, the MCAE process with the enzyme-producing strain G1–5 exhibited an increase of 25.52% and 38.45% in GA and GD extraction rates, respectively. These findings provide valuable guidance and innovative strategies for the extraction of active ingredients.
研究领域:
植物化学
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生物技术
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药用植物学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Yu Xie,Wanzhong Yin,Ningbo Song,Jin Yao
In this work, using syringic acid (SA) as a novel eco-friendly inhibitor and dodecylamine (DDA) as a collector in a cationic reverse flotation system, the effect of SA on the flotation separation of hematite and chlorite was investigated. Micro-flotation experiments and artificial mixed mineral experiments were conducted to study the flotation behavior of hematite and chlorite in the presence of SA. The adsorption mechanism of SA on the surfaces of hematite and chlorite was analyzed through methods such as Zeta potential, AFM, FTIR, XPS testing, and DFT calculations. Flotation experiments showed that after adding SA, the recovery rate of hematite was 88.87%, and that of chlorite was 7.01%, effectively achieving the separation of hematite and chlorite. Mechanism analysis indicated that SA could form complexes with Fe atoms, selectively adsorb on the surface of hematite, hinder the adsorption and capture of DDA on hematite, and suppress the flotation of hematite without affecting the surface properties of chlorite. Therefore, SA can serve as apotential selective inhibitor for the separation of hematite and chlorite.
研究领域:
矿物学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·2022
·
IF 4.4
Qiongmei Mai,Yu Lu,Qianyu Cai,Jianglong Hu,Yunyou Lv,Yonglan Yang,Liqiang Wang,Yuezhao Zhou,Jie Liu
Sclerotinia sclerotiorumis one of the fungi that cause plant diseases. It damages plants by secreting large amounts of oxalic acid and cell wall-degrading enzymes. To meet this challenge, we designed a new pH/enzyme dual-responsive nanopesticide Pro@ZnO@Pectin (PZP). This nanopesticide uses zinc oxide (ZnO) as a carrier of prochloraz (Pro) and is encapsulated with pectin. When encountering oxalic acid released bySclerotinia sclerotiorum, the acidic environment promotes the decomposition of ZnO; at the same time, the pectinase produced bySclerotinia sclerotiorumcan also decompose the outer pectin layer of PZP, thereby promoting the effective release of the active ingredient. Experimental data showed that PZP was able to achieve an efficient release rate of 57.25% and 68.46% when pectinase was added or under acidic conditions, respectively. In addition, in vitro tests showed that the antifungal effect of PZP was comparable to that of the commercial Pro (Pro SC) on the market, and its efficacy was 1.40 times and 1.32 times that of the Pro original drug (Pro TC), respectively. Crucially, the application of PZP significantly alleviated the detrimental impacts of Pro on wheat development. Soil wetting experiments have proved that PZP primarily remained in the soil, thereby decreasing its likelihood of contaminating water sources and reducing potential risks to non-target organisms. Moreover, PZP improved the foliar wettability of Pro, lowering the contact angle to 75.06°. Residue analyses indicated that PZP did not elevate prochloraz residue levels in tomato fruits compared to conventional applications, indicating that the nanopesticide formulation does not lead to excessive pesticide buildup. In summary, the nanopesticide PZP shows great promise for effectively managingSclerotinia sclerotiorumwhile minimizing environmental impact.
研究领域:
植物病理学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jie Wang,Yuan-Yuan Zhang,Dan Liu,Chen-Chun Zhong,Ya-Hui Hu,Fei Zhao,Hong-Li Guo,Feng Chen
The balance of oxalic acid in the body is intricately regulated. Importantly, elevated levels of oxalic acid in urine or blood have been linked to the progression of various diseases. There is strong interest in developing efficient methods to quantify oxalic acid in various bio-matrices like urine. However, due to its small molecular weight, high polarity, acidic nature, and endogenous properties, establishing an analysis method based on liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) for oxalic acid presents significant challenges, and such analysis methods that meet clinical needs are not widely available. Faced with the aforementioned challenging issues, in this study, we have discovered innovative strategies to improve the ionization, chromatographic separation, and enrichment of oxalic acid and its internal standard, leading to the successful LC-MS/MS method development and clinical application of the analysis method. These include: (1) simultaneous use of two low concentrations of electrolytes (NH 3 ·H 2 O and NH 4 Ac) in the mobile phase; (2) alkalinization of urine; (3) addition of 0.3 % NH 3 ·H 2 O to the internal standard oxalic acid-1,2- 13 C solution; (4) selection of ultrapure water (UPW) as an alternative matrix; (5) urine sample processing using an easy-to-use protein precipitation method. These measures have created a relatively homogeneous alkaline environment, addressing the issues in the ionization, chromatographic separation, and enrichment of oxalic acid and its internal standard. Of note, chromatographic separation of oxalic acid and oxalic acid-1,2- 13 C was achieved on the Waters Symmetry C18 column (4.6 mm × 50 mm, 3.5 μm) with an isocratic elution at a flow rate of 0.40 mL/min. The target analyte was completely separated by elution with 30 % acetonitrile containing 0.01 % NH 3 ·H 2 O and 1 mM NH 4 Ac for 3 min, without any endogenous interference. The method showed good linearity over the 0.020–50.0 μg/mL concentration range with a correlation coefficient r 2 = 0.9998. The intra-assay and inter-run precision and accuracy, recovery, and stability of the method were all within the acceptable parameters. Collectively, this study developed and validated a simple, fast, and sensitive LC-ESI-MS/MS method that did not require complex derivatization, acidification, large-volume sample consumption. Moreover, this method was successfully applied for routine urinary oxalic acid detection in children with kidney disease, providing valuable information for clinicians.
研究领域:
临床医学
·
分析化学
·
肾脏病学
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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）