ENVIRONMENTAL TECHNOLOGY
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2023
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IF 2.8
Songyuan Hao,Hong Yuan,Huiliang Zhou
Ni-Cu/Al-KCC-1 catalysts with different metal contents were prepared using fibrous nano-silica (Al-KCC-1) as a support. Field emission scanning electron microscopy observations showed that the spherical particle morphology and fibrous structure of the Al-KCC-1 were not changed after metal loading. Transmission electron microscopy images demonstrated that the introduction of copper improved the dispersion of the nickel, while X-ray diffraction and hydrogen temperature-programmed reduction confirmed the formation of a Ni-Cu alloy. The N2-Brunauer–Emmett–Teller specific surface areas of the catalysts were in the range of 269–378 m2/g and the average pore diameters were 7.988–12.078 nm. These Ni-Cu/Al-KCC-1 catalysts were used to promote the cracking of waste cooking oil model compound (WCOMC) to produce H2 and carbon nanotubes (CNTs), and the 10 wt% Ni-5 wt% Cu/Al-KCC-1 exhibited the highest catalytic activity. At a WCOMC flow rate of 0.04 mL/min and 750 °C, the instantaneous volume fraction of H2 reached 49.8 vol% and the content of H2 in the gaseous product was close to 71.4 vol%.
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Journal of Water Process Engineering
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2023
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IF 7
Xinrui Wang,Mengxian Yu,Qingzhu Jia,Fangyou Yan,Qiang Wang
Ionic liquids (ILs) have high chemical stability and resistance to biodegradation, and their highly efficient removal from the water environment is imminent due to their potential ecotoxicity and environmental risks. Yet, current degradation methods are inefficient for ionic liquids even if activation of persulfate (PS) is enhanced by vis with the presence of catalysts. In this study, a simple and high-efficient simulated solar to activate PS was conducted for the degradation of 1-ethyl-3-methylimidazolium chloride (C 2 mimCl). The results revealed that over 99 % of C 2 mimCl was degraded by solar activated PS within 4 h at 25 °C. The degradation of the C 2 mimCl still exhibited excellent performance under natural sunlight activated PS, providing the practical application value. Based on density function theory (DFT) calculation and major intermediates determined by ultra-high-performance liquid chromatography triple quadrupole mass spectrometry (UHPLC-TQ-MS), the first major sites of C 2 mimCl to be attacked were the C atoms on imidazolium ring, followed by the alkyl side chain, and the degradation of C 2 mimCl was mainly carried out by imidazolium ring oxidation , C–N bond breakage and elimination reactions. Consequently, the findings of this work may provide new insight on the degradation of ILs by solar activated PS with excellent practical application.
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Biomass Conversion and Biorefinery
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2023
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IF 4
Chen Yang,Qi Wei,Shakeel Usama,Liang Cuiyi,Wang Wen,Hu Yunzi,Wang Zhongming,Yuan Zhenhong,Shen Fei,Wang Qiong
The efficient fractionation and recovery of lignocellulosic biomass (LCB) constituents, hemicellulose, cellulose, and lignin, are ideal for LCB utilization. In this study, we prepared a solid acid catalyst (SPS120-40) with high acid density using polystyrene resin (PS) as precursor. The synthesized catalyst was characterized by XPS, 13 C NMR, TG-FTIR-MS, and so on to investigate its structural properties and thermal stability. During process optimization using FeCl 3 -assisted SPS120-40, a total of 78.9% xylose yield with 96.6% monosaccharide selectivity was achieved. Moreover, the catalyst showed extraordinary catalytic activity until five runs without significant loss in xylose yield. The pretreated residue was further treated with NaOH-1-butanol to effectively remove the lignin deposited on the residue surface and eventually 89.5% hydrolysis rate was obtained. At the same time, 64.4% lignin was obtained in the residue of enzymatic hydrolysis. This work provides important guidance for utilizing the whole components of lignocellulose.
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Frontiers in Microbiology
·
2023
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IF 5.2
Zheng Fengzhen,Basit Abdul,Wang Jiaqiang,Zhuang Huan,Chen Jun,Zhang Jianfen
In this study, an acidophilic GH5 β-mannanase (TaMan5) from Trichoderma asperellum ND-1 was efficiently expressed in Pichia pastoris (a 2.0-fold increase, 67.5 ± 1.95 U/mL). TaMan5 displayed the highest specificity toward locust bean gum (Km = 1.34 mg/mL, Vmax = 749.14 μmol/min/mg) at pH 4.0 and 65°C. Furthermore, TaMan5 displayed remarkable tolerance to acidic environments, retaining over 80% of its original activity at pH 3.0–5.0. The activity of TaMan5 was remarkably decreased by Cu2+, Mn2+, and SDS, while Fe2+/Fe3+ improved the enzyme activity. A thin-layer chromatography (TLC) analysis of the action model showed that TaMan5 could rapidly degrade mannan/MOS into mannobiose without mannose via hydrolysis action as well as transglycosylation. Site-directed mutagenesis results suggested that Glu205, Glu313, and Asp357 of TaMan5 are crucial catalytic residues, with Asp152 playing an auxiliary function. Additionally, TaMan5 and commercial α-galactosidase displayed a remarkable synergistic effect on the degradation of galactomannans. This study provided a novel β-mannanase with ideal characteristics and can be considered a potential candidate for the production of bioactive polysaccharide mannobiose.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yuxiu Fu,Xiaoli Song,Yaming Pang,Yinan Zheng,Liguo Gao
In this paper, a green solvent [BMIM] [PF 6 ] ionic liquid was selected for the extraction and separation of quinoline from simulated wash oil. The effects of extraction temperature, extraction time, and solvent oil ratio on the extraction of quinoline from wash oil were studied. The optimal process parameters were obtained by changing single factor conditions and optimizing the experiment using response surface methodology. When the temperature is 71 ℃, the time is 60 min, and the solvent oil ratio is 3:5, the extraction efficiency can reach 67%. The ionic liquids were recovered and their properties were investigated by infrared spectroscopy. The mechanism of quinoline extraction by ionic liquids was analyzed using infrared spectroscopy and GROMACS kinetic simulation calculations.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Xiangchun Yang,Guangling He,Wenjian Dong,Liangmin Yu,Xia Li
Novel multisubstituted dopamine derivatives were synthesized and their ability to protect carbon steel in 1 M HCl was investigated by combining electrochemistry , surface analysis and theoretical calculations. The results showed that 91.53% inhibition could be obtained by adding 0.1 g/L of dopamine derivatives at 298 K. Potentiodynamic polarization tests showed that the addition of the dopamine derivative resulted in a corrosion potential difference of ≤ 31 mV, thus identifying the compound as a hybrid inhibitor. X-ray photoelectron spectroscopy and contact angle indicate the successful formation of a hydrophobic barrier on the carbon steel surface, and scanning electron microscopy and laser confocal microscopy confirm the improvement in surface morphology. The dopamine derivatives fit the Langmuir adsorption model with both physical and chemical adsorption. Density functional theory and molecular dynamics simulations revealed that dopamine derivatives rely on lone pairs of electrons in heteroatoms to adsorb parallel to the metal substrate and protect the carbon steel from corrosive media attack. Thus, dopamine derivatives can contribute to the pickling industry as a green corrosion inhibitor to avoid steel damage and waste.
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Frontiers in Microbiology
·
2023
·
IF 5.2
Miao Lei,Chen Siyuan,Yang Hua,Hong Yaqi,Sun Liwen,Yang Jie,Sun Guanjun,Liu Yi,Li Chunyan,Zang Hailian,Cheng Yi
Triclocarban (TCC), an emerging organic contaminant (EOC), has become a severe threat to soil microbial communities and ecological security. Here, the TCC-degrading strain Rhodococcus rhodochrous BX2 and DCA-degrading strain Pseudomonas sp. LY-1 (together referred to as TC1) were immobilized on biochar to remove TCC and its intermediates in TCC-contaminated soil. High-throughput sequencing was used to investigate the microbial community structure in TCC-contaminated soil. Analysis of co-occurrence networks was used to explore the mutual relationships among soil microbiome members. The results showed that the immobilized TC1 significantly increased the removal efficiency of TCC from 84.7 to 92.7% compared to CK (no TC1 cells on biochar) in 10 mg/L TCC liquid medium. The utilization of immobilized TC1 also significantly accelerated the removal of TCC from contaminated soil. Microbial community analysis revealed the crucial microorganisms and their functional enzymes participating in TCC degradation in soil. Moreover, the internal labor division patterns and connections of TCC-degrading microbes, with a focus on strains BX2 and LY-1, were unraveled by co-occurrence networks analysis. This work provides a promising strategy to facilitate the bioremediation of TCC in soil, which has potential application value for sustainable biobased economies.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2023
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IF 5.6
Zhehuan Wang,Huiru Zhang,Caihong Qi,Hui Guo,Xiangyue Jiao,Jia Yan,Yifei Wang,Qiangsheng Li,Mingming Zhao,Xinhao Guo,Baoluo Wan,Xiaotian Li
Background Ursolic acid (UA) is a triterpenoid compound found in natural plants. It has been reported to have anti-inflammatory, antioxidant, and immunomodulatory properties. However, its role in atopic dermatitis (AD) is unknown. This study aimed to evaluate the therapeutic effect of UA in AD mice and explore the underlying mechanisms. Methods Balb/c mice were treated with 2, 4-dinitrochlorobenzene (DNCB) to induce AD-like lesions. During modeling and medication administration, dermatitis scores and ear thickness were measured. Subsequently, histopathological changes, levels of T helper cytokines, and oxidative stress markers levels were evaluated. Immunohistochemistry staining was used to assess changes in the expression of the nuclear factor of kappa B (NF-κB) and NF erythroid 2-related factor 2 (Nrf2). Furthermore, CCK8 assay, reactive oxygen species (ROS) assay, real-time PCR, and western blotting were employed to evaluate the effects of UA on ROS levels, inflammatory mediator production, and the NF-κB and Nrf2 pathways in TNF-α/IFN-γ-stimulated HaCaT cells. Results The results showed that UA significantly reduced dermatitis score and ear thickness, effectively inhibited skin proliferation and mast cell infiltration in AD mice, and decreased the expression level of T helper cytokines. Meanwhile, UA improved oxidative stress in AD mice by regulating lipid peroxidation and increasing the activity of antioxidant enzymes. In addition, UA inhibited ROS accumulation and chemokine secretion in TNF-α/IFN-γ-stimulated HaCaT cells. It might exert anti-dermatitis effects by inhibiting the TLR4/NF-κB pathway and activating the Nrf2/HO-1 pathway. Conclusion Taken together, our results suggest that UA may have potential therapeutic effects on AD and could be further studied as a promising drug for AD treatment.
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FOOD CHEMISTRY
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2023
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IF 8.8
Wenjie Ma,Yuting Liang,Huasi Lin,Yi Chen,Jianhua Xie,Fengling Ai,Ziwen Yan,Xiaobo Hu,Qiang Yu
In the study, a highly efficient cellulose-degrading strain was screened, which was identified as a fungus in the genus Penicillium sp., named YZ-1. The content of soluble dietary fiber was greatly increased by the treatment of this strain. In addition, the effects of soluble dietary fiber from high-pressure cooking group (HG-SDF), strain fermentation group (FG-SDF) and control group (CK-SDF) on the physicochemical structure, and in vitro hypolipidemic activity were investigated. The results showed that the physicochemical structure of the raw materials was improved after fermentation, and FG-SDF exhibited the loosest structure, the highest viscosity and thermal stability. Furthermore, compared to CK-SDF and HG-SDF, FG-SDF showed the most significant improvement in functional properties, including cholesterol adsorption capacity (CAC), inhibition of pancreatic lipase activity (LI) and mixed bile acid adsorption capacity (BBC). Overall, these findings will provide new insights into dietary fiber modification and improve the comprehensive use value of grapefruit by-products.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Kané Rabé,Lifen Liu,Noor Ahmed Nahyoon,Yizhen Zhang,Ahmed Mahmoud Idris,Jiaqi Sun,Lixin Yuan
We have prepared and studied a novel low cost catalyst of g-C 3 N 4 /Fe 0 (1%)/TiO 2, using a simple process involving the formation of zero valence iron by chemical reduction . This ternary catalyst g-C 3 N 4 /Fe 0 (1%)/TiO 2 was characterized using XRD (X-Ray diffraction), UV–vis spectrum, EDS (Energy Dispersive spectrum) and TEM (transmission electron microscopy), it demonstrated high-visible-light activity in a wide range of pH condition, it can photo-catalytically degraded Rhodamine B (RhB), Tetracycline (TC), and Berberine hydrogen chloride (BH) (∼98% in 90 min) under visible light. The high activity arises from the increased harvest of more visible light and the improved separation of photo-excited electrons and holes via Z-scheme and heterojunctions mechanism. Also, the time required to remove 100% RhB, TC, and 96% BH can be shortened from 90 min to 60 min by introducing 3.18 mM Na 2 SO 3 to this photocatalysis system that assisted the generation of reactive oxidizing species and pollutant degradation. The results showed promising application prospect for this developed catalyst and the tested photocatalysis pollutant degradation system.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2018
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IF 3.974
Peng Chen,Na Geng,Dong Zhou,Yiran Zhu,Yuliang Xu,Kangping Liu,Yongxia Liu,Jianzhu Liu
Hexavalent chromium (Cr(VI)) is a common environmental pollutant. Exposure of Cr(VI) can lead to cell autophagy, but the preventive measures for diminishing Cr(VI)-induced autophagy need further study. COX-2 can be induced by several heavy metals and can lead to endoplasmic reticulum (ER) stress and autophagy; thus, COX-2, ER stress, and autophagy may be related. This study mainly investigated the role of COX-2 in the eIF2α-ATF4 pathway, which is a major pathway in cell autophagy. In this study, Cr(VI) was used as a xenobiotic to determine changes in the parameters of ER stress, autophagy, and COX-2 levels. At the same time, a clear contrast was obtained by assigning positive and negative controls of ER stress and autophagy. The results showed that during Cr(VI) invasion, the parameters of ER stress and autophagy (such as BiP, PERK, p62, LC3-II, and mTOR) were enhanced, similarly to the positive control of ER stress and/or the autophagy controls. Such enhancement is a protective mechanism for cell survival. Additionally, the COX-2 levels increased. Moreover, when COX-2 was inhibited, the PERK level remained high, whereas the LC3-II level decreased. This finding suggests that COX-2 specifically affects the interaction between ER stress and autophagy. Notably, this study reveals that Cr(VI) can induce ER stress and autophagy in DF-1 cells and that COX-2 plays an essential role in the interaction between ER stress and autophagy.
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Polymers
·
2019
·Vol. 11
·期 4
·598
·
IF 3.164
Xin Min,Xiaodong Fan
This work reports the preparation of a hydroxyl terminated polystyrene-b-polybutadiene-b-polystyrene triblock copolymer (SBS) with high cis-1, 4 content via a novel nickel catalyst, [η3-Ni(CH2CHCHCH2OOCH3)][BPhF4]. FT-IR,1H-NMR, and13C NMR indicated that the polybutadiene segment of the copolymer contains greater than 90% cis-1, 4 structure, indicating achievement of the objective. Toward the functionalization goal, a hydroxyl group was successfully introduced at the end of the triblock copolymer (HO–SBS–OH). The results of gel permeation chromatography (GPC) revealed that the polymer is indeed a triblock copolymer, with no traces of homopolymer. Differential scanning calorimetry (DSC) showed that HO–SBS–OH synthesized using the novel catalyst had a lower glass transition temperature (Tg) than HO–SBS–OH synthesized with an alkyl lithium catalyst. Therefore, the polymer synthesized via the novel catalyst contains high cis-1,4 content and displays excellent low-temperature mechanical properties.Keywords:hydroxyl terminated polystyrene-b-polybutadiene-b-polystyrene triblock copolymer;high cis-1,4 content;nickel catalyst
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