Biomass Conversion and Biorefinery
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2022
·
IF 4.05
Nie Kai,Liu Shaoyang,Zhao Tao,Tan Zhijian,Zhang Yuanming,Song Yan,Li Boya,Li Linlin,Lv Wanwan,Han Guangting,Jiang Wei
Efficient fractionation and valorization of biomass major components are important for biomass utilization. Deep eutectic solvent (DES) treatment is a promising method for biomass processing. In this study, a choline chloride oxalic acid dihydrate (ChCl-OA) DES treatment method was developed to efficiently separates biomass components and isolate the lignin from bamboo. Hemicellulose (from 16.2 to 3.2%) and lignin (from 27.4 to 4.9%) components in recovery solid were significantly reduced. Results revealed that the DES-extracted lignin (DESL) had a higher yield (82.1%) and purity (94.9%), but a lower molecular weight (1148 g/mol) compared with the milling wood lignin (MWL) and alkali lignin (AL). Meanwhile, the DESL from the acid DES pretreatment of bamboo biomass was beneficial to the preparation of stable and homogenous lignin nanoparticles (LNPs). This study provides an efficient method to separate the main components of biomass and prepare LNPs. The DES treatment showed great potential for biomass component fractionation and lignin valorization.
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Analytical Methods
·
2022
·Vol. 14
·期 47
·4938-4946
·
IF 3.532
Wanliang Liao,Yang Xu,Dingyun Li,Yixing Ye,Yuhan Ning,Weiping Wang,Ai-jun Wang
In this study, a functionalized magnetic covalent organic framework (NiFe2O4@TAPB-TPA) was fabricated with NiFe2O4 nanoparticles as the magnetic core, and 1,3,5-tris(4-aminophenyl)benzene (TAPB) and terephthalaldehyde (TPA) as building blocks by a facile room temperature strategy. Benefitting from the π–π stacking and hydrogen bond interaction, NiFe2O4@TAPB-TPA showed great potential as a magnetic adsorbent for the extraction of tetracyclines (TCs). Under optimal conditions, good linearities (R2 > 0.9990) were obtained between the peak area and TC concentration in the range of 1–500 μg L−1 with limits of detection ranging from 0.09 to 0.26 μg L−1. The intra-day and inter-day relative standard deviations were less than 2.2% and 4.7%, respectively. The established method was successfully applied for the determination of TCs in diverse environmental water samples with satisfactory recoveries in the range of 91.6–102.7%. In addition, NiFe2O4@TAPB-TPA showed good reusability with the recoveries for TCs higher than 73.1% after nine recycles, indicating potential application of NiFe2O4@TAPB-TPA as an ideal adsorbent for the enrichment of TCs.
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MOLECULES
·
2022
·Vol. 27
·期 21
·7431
·
IF 4.927
Caimei Zhang,Wenjuan Zhang,Yiran Wu,Bo Peng,Chunyuan Tian,Feng Luan,Wen Sun,Xuming Zhuang,Lijun Zhao
With several major polarity and weak optical properties, the sensitive detection of HCOOH remains a major challenge. Given the special role of HCOOH in assisting in the catalytic hydrogenation process of Ir complexes, HCOOH (as a hydrogen source) could rapidly activate Ir complexes as catalysts and further reduce the substrates. This work developed a facile and sensitive HCOOH fluorescence sensor utilizing an optimal catalytic fluorescence generation system, which consists of the phenyl-pyrazole-type Ir-complex PP-Ir-Cl and the coumarin-type fluorescence probe P-coumarin. The sensor demonstrates excellent sensitivity and specificity for HCOOH and formates; the limits of detection for HCOOH, HCOONa, and HCOOEt3N were tested to be 50.6 ppb, 68.0 ppb, and 146.0 ppb, respectively. Compared to previous methods, the proposed sensor exhibits good detection accuracy and excellent sensitivity. Therefore, the proposed HCOOH sensor could be used as a new detection method for HCOOH and could provide a new design path for other sensors.Keywords:HCOOH detection;Ir complexes;catalytic hydrogenation;fluorescence probe
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MINERALS ENGINEERING
·
2022
·
IF 5.479
Xianping Luo,Xianqiang Yuan,Kunzhong He,Yongbing Zhang,Caigui Luo,Zishuai Liu,Hepeng Zhou
Impurity metal ions in ionic rare earth ores are similar to rare earth ions in terms of occurrences and similarities in properties. During the leaching operation, a large number of impurity ions enter the rare earth leaching solution, which makes the crystal form of the rare earth unstable or forms an amorphous flocculent precipitate. The commonly used ammonium bicarbonate (NH 4 HCO 3 ) precipitation crystallization process has low rare earth precipitation rate, long precipitation crystallization period, and high ammonia nitrogen content in precipitation wastewater. In this paper, the leaching solution obtained by ionic rare earth ore magnesium salt leaching-combined impurity removal process was taken as the research object, and the effects of precipitants, such as NH 4 HCO 3 , calcium oxide, sodium carbonate, and oxalic acid, on the preparation of crystalline rare earth precipitation were investigated through comparison. On the premise of determining the best rare earth precipitant, the effects of dosage, stirring speed, stirring time, and aging time on the preparation of crystalline rare earth precipitate were investigated further. The precipitation effects of different precipitation processes were studied systematically combined with SEM-EDS, laser particle size analysis, and other means to characterize the morphology of crystalline products. Results showed that when calcium oxide was used as a precipitant, the molar ratio was 2.5. After stirring at a constant speed of 200 r/min for 4 h and aging for 4 h, precipitates with good crystal appearance, smooth crystal surface and easy filtration were obtained. This process promoted crystal growth of rare earth precipitates, and the crystal grain size, which was beneficial to the improvement of the quality of rare earth products, increases significantly.
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Environmental Science-Water Research & Technology
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2022
·Vol. 8
·期 11
·2602-2613
·
IF 5.819
Yanling Chen,Yajie Chen,Xue Bai
Metal–organic frameworks (MOFs) have been demonstrated to be promising catalysts in advanced oxidation processes (AOPs), while the poor recyclability due to the powder form limits their practical application. Herein, MIL-88A was successfully embedded in a chitosan matrix for the first time to form 3D micro–meso-structured beads (MIL-88A-CS) by an in situ growth method and the beads were used as heterogeneous peroxymonosulfate (PMS) activators to degrade tetracycline hydrochloride (TC-HCl). 97.1% TC-HCl was removed by the MIL-88A-CS/PMS system in 60 min. The main parameters affecting the TC-HCl degradation efficiency were studied. The sulfate radical (SO4˙−) and hydroxyl radical (˙OH) played dominant roles in the TC-HCl removal. The possible TC-HCl degradation mechanism of the MIL-88A-CS/PMS system was proposed. The excellent catalytic activity of MIL-88A-CS was attributed to the abundant Fe active sites, –COOH groups, and large specific surface area, as well as microporous and mesoporous structures. Reasonable degradation pathways were analyzed by identifying TC-HCl intermediates. Significantly, it is the first time to comprehensively assess the practical application potential of the MIL-88A-CS beads from the perspectives of ecotoxicity, reusability, stability, TC-HCl removal efficiency in actual water environments, and economic applicability. This work provides a promising PMS activator for the removal of emerging contaminants and promotes the practical application of MOFs in wastewater treatment.
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ACS Sensors
·
2022
·
IF 9.618
Kexin Fan,Jiayang Zeng,Chenyu Yang,Gonglei Wang,Kai Lian,Xiuhong Zhou,Yaping Deng,Guozhen Liu
Uric acid (UA) is an important biomarker for many diseases. A sensitive point-of-care (POC) testing platform is designed for the digital quantification of salivary UA based on a colorimetric reaction on an easy-to-build smartphone-assisted microfluidic paper-based analytical device (SμPAD). UA levels are quantified according to the color intensity of Prussian blue on the SμPAD with the aid of a MATLAB code or a smartphone APP. A color correction method is specifically applied to exclude the light effect. Together with the engineering design of SμPADs, the background calibration function with the APP increases the UA sensitivity by 100-fold to reach 0.1 ppm with a linear range of 0.1–200 ppm. The assay time is less than 10 min. SμPADs demonstrate a correlation of 0.97 with a commercial UA kit for the detection of salivary UA in clinical samples. SμPADs provide a sensitive, fast, affordable, and reliable tool for the noninvasive POC quantification of salivary UA for early diagnosis of abnormal UA level-associated health conditions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Junxia Shao,Heng Fei,Hua Li,Liujun Yang,Miaomiao Li,Jin Gao,Huarong Liao,Jianmei Lu
Promoting carrier separation has received much attention owing to attractive enhancement effects in improving the utilization efficiency of photo-generated carrier. However, the photocatalytic performance has remained limiting mainly due to lack of magnifying carrier generation fundamentally. Herein, carrier generation enhanced CNS 0.6 /Au-1 is established by loading ultrafine Au nanoparticles on S-doped carbon nitride (CNS x ) for efficient hexavalent chromium degradation. CNS x can activate the n → π* electronic transition of carbon nitride besides keeping the original π → π* electronic transition. Plasmon-induced hot electron of Au nanoparticles merge with e − excited from π → π* and n → π* transition in CNS x increasing the amount of catalytically effective electrons, and the efficient carrier separation is also achieved. Near-infrared absorption CNS 0.6 /Au-1 exhibits a remarkable photo-reactivity for the degradation of Cr(Ⅵ), which can degrade 10 ppm Cr(Ⅵ) completely within 40 min. This work proposes a general strategy of increasing different types of electron transitions to promote carrier generation.
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MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 9
·2200203
·
IF 4.402
Yong Li,Jiehao Qu,Zenghui Dai,Junyi Jiang,Jiajia Fu,Feiya Fu,Xiangdong Liu
Herein, the successful design of a highly bio-based family of unsaturated polyester resins (UPRs) is presented, comprising of an isosorbide (ISO) incorporated unsaturated polyester prepolymer (UP) and a reactive diluent of 4-vinylguaiacol acetyl ester (ACVG). A series of UPs are prepared by copolymerizing ISO with other green monomers, i.e., itaconic acid, ethylene glycol and oxalic acid, in a variation of ISO fraction. The UP/ACVG mixtures exhibit very low viscosity ranging from 2.8 to 3.7 Pa s. After curing at 135 °C to form a network, the resulting thermosets exhibit remarkable improvements in terms of glass transition ( T g , about 131 °C), storage modulus (2564–3342 MPa), and tensile strength (around 76.6 MPa), which are significantly better than the UP thermosets reported in previous works, The incorporation of ISO units into the UPs reveals a favorable effect on thermal stability of the thermosets as well. The best Td5% is measured to be 320.4 °C, and the volatile molecular information collected using a TGA-GC/MS set suggests that the decomposition mechanism of the cross-linked resins becomes heat-resistant due to the ISO incorporation. Moreover, after being reinforced by cotton fabrics, an outstanding compatibility between the ISO containing UPRs and cotton fibers is found to be suitable for composite fabrication.
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Petroleum Science
·
2022
·
IF 4.757
Long Xu,Xu Liu,Hong-Yu Ding,Huan Zhang,Lei Liu,Jing-Hui Li,Hou-Jian Gong,Ming-Zhe Dong
Amide- and alkyl-modified nanosilicas (AANPs) were synthesized and introduced into Xanthan gum (XG) solution, aiming to improve the temperature/salt tolerance and oil recovery. The rheological behaviors of XG/AANP hybrid dispersions were systematically studied at different concentrations, temperatures and inorganic salts. At high temperature (75 °C) and high salinity (10,000 mg⋅L −1 NaCl), AANPs increase the apparent viscosity and dynamic modulus of the XG solution, and XG/AANP hybrid dispersion exhibits elastic-dominant properties. The most effective concentrations of XG and AANP interacting with each other are 1750 mg⋅L −1 and 0.74 wt%, respectively. The temperature tolerance of XG solution is not satisfactory, and high temperature further weakens the salt tolerance of XG. However, the AANPs significantly enhance the viscoelasticity the XG solution through hydrogen bonds and hydrophobic effect. Under reservoir conditions, XG/AANP hybrid recovers approximately 18.5% more OOIP (original oil in place) than AANP and 11.3% more OOIP than XG. The enhanced oil recovery mechanism of the XG/AANP hybrid is mainly increasing the sweep coefficient, the contribution from the reduction of oil-water interfacial tension is less.
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Nanomaterials
·
2022
·Vol. 12
·期 13
·2210
·
IF 5.719
Huiyong Wang,Hongmei Yu,Ayman AL-Zubi,Xiuhui Zhu,Guochao Nie,Shaoyan Wang,Wei Chen
The synthesis of room temperature phosphorescent carbon dots (RTP-CDs) without any matrix is important in various applications. In particular, RTP-CDs with dual modes of excitation are more interesting. Here, we successfully synthesized matrix-free carbonized polymer dots (CPDs) that can generate green RTP under visible and ultraviolet light dual-mode excitation. Using acrylic acid (AA) and ammonium oxalate as precursors, a simple one-pot hydrothermal method was selected to prepare AA-CPDs. Here, acrylic acid is easy to polymerize under high temperature and high pressure, which makes AA-CPDs form a dense cross-linked internal structure. Ammonium oxalate as a nitrogen source can form amino groups during the reaction, which reacts with a large number of pendant carboxyl groups on the polymer chains to further form a cross-linked structure. The carboxyl and amino groups on the surface of AA-CPDs are connected by intermolecular hydrogen bonds. These hydrogen bonds can provide space protection (isolation of oxygen) around the AA-CPDs phosphor, which can stably excite the triplet state. This self-matrix structure effectively inhibits the non-radiative transition by blocking the intramolecular motion of CPDs. Under the excitation of WLED and 365 nm ultraviolet light, AA-CPDs exhibit the phosphorescence emission at 464 nm and 476 nm, respectively. The naked-eye observation exceeds 5 s and 10 s, respectively, and the average lifetime at 365 nm excitation wavelength is as long as 412.03 ms. In addition, it successfully proved the potential application of AA-CPDs in image anti-counterfeiting.Keywords:carbon dots;room temperature phosphorescence;visible/ultraviolet light excitation;anti-counterfeiting
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高影响因子
Foods
·
2022
·Vol. 11
·期 13
·1920
·
IF 5.561
Qi Quan,Wei Liu,Jiajing Guo,Meiling Ye,Juhua Zhang
Six lactic acid bacteria strains were used to study the effects on physicochemical characteristics, antioxidant activities and sensory properties of fermented orange juices. All strains exhibited good growth in orange juice. Of these fermentations, some bioactive compositions (e.g., vitamin C, shikimic acid) and aroma-active compounds (e.g., linalool, 3-carene, ethyl 3-hydroxyhexanoate, etc.) significantly increased inLactiplantibacillus plantarumandLactobacillus acidophilussamples. DPPH free radical scavenging rates inL. plantarumandLacticaseibacillus paracaseisamples increased to 80.25% and 77.83%, respectively. Forty-three volatile profiles were identified, including 28 aroma-active compounds. 7 key factors significantly influencing sensory flavors of the juices were revealed, including D-limonene, linalool, ethyl butyrate, ethanol,β-caryophyllene, organic acids and SSC/TA ratio. The orange juice fermented byL. paracasei, with more optimization aroma-active compounds such as D-limonene,β-caryophyllene, terpinolene andβ-myrcene, exhibited more desirable aroma flavors such as orange-like, green, woody and lilac incense, and gained the highest sensory score. Generally,L. paracaseifermentation presented better aroma flavors and overall acceptability, meanwhile enhancing antioxidant activities.Keywords:orange juice;lactic acid fermentation;physicochemical characteristics;antioxidant activities;volatile profiles;sensory properties
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Frontiers in Nutrition
·
2022
·
IF 6.59
Feng Y,Gao S,Zhu T,Sun G,Zhang P,Huang Y,Qu S,Du X,Mou D
Context Hyperlipidemia is a highly prevalent risk factor for atherosclerosis and stroke. The currently available medications used to treat Hyperlipidemia cannot improve its oxidative stress damage. Consumption of hawthorn can regulate blood sugar and blood lipids, and its rich fruit acid is a natural antioxidant that can improve oxidative stress damage. Objective The present research aimed to investigate the protective effect of hawthorn fruit acid (HFA) on hyperlipidemia and to determine its potential molecular mechanism. Materials and methods Sprague-Dawley rats were fed a high-fat diet (HFD) to induce hyperlipidemia and treated orally with hawthorn fruit acids (HFA). Serum and liver levels of total cholesterol (TC), triglycerides (TG), high-density lipoprotein cholesterol (HDL-C), superoxide dismutase (SOD), hydrogen peroxide (CAT), and malondialdehyde (MDA) were measured. Human hepatocellular carcinoma cell lines (HepG2) cells were treated with 0.1 mM oleic acid and HFA (0.125, 0.25 mg/mL), and intracellular TC, TG, HDL-C, SOD, CAT and MDA were measured. Changes in LDLR, HMGCR, Nrf2, HO-1, NQO1 protein and gene expression were analyzed by Western blot and qPCR. Results This study found that HFA treatment effectively reduced the level of triglyceride, cholesterol, and glucose, and attenuated hepatic steatosis in rats. Additionally, oxidative stress damage of rats was effectively reduced by treatment with HFA. Western blot and qPCR analysis indicated that HFA treatment inhibited fat accumulation in HepG2 cells by upregulating LDLR and downregulating HMGCR gene expression. HFA inhibits oleic acid (OA)-induced oxidative damage to HepG2 by activating the Nrf2/HO-1 signaling pathway. Conclusion HFA administration can provide health benefits by counteracting the effects of hyperlipidemia caused by an HFD in the body, and the underlying mechanism of this event is closely related to the activation of the Nrf2/HO-1 signaling pathway.
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