JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Bowen Chen,Yuanwen Hou,Hanke Li,Hejun Gao,Hongquan Fu,Fang Liao,Juan Zhang,Yunwen Liao
The catalytic conversion of nitrogen to ammonia is one of the most significant processes in nature and the chemical industry. However, the traditional Haber-Bosch process of ammonia synthesis consumes substantial energy and emits a large amount of carbon dioxide . The efficiency of photocatalytic N 2 activation is severely limited by the lack of N 2 adsorption sites and poor carrier utilization. Herein, an efficient α-Bi 2 O 3 /Bi 3 O 4 Br heterojunction is proposed with a photocatalytic nitrogen fixation activity of 238.67 μmol·g −1 ·h −1 . Compared with the BiOBr precursor, α-Bi 2 O 3 and Bi 3 O 4 Br, the α-Bi 2 O 3 /Bi 3 O 4 Br heterojunction with oxygen vacancies can improve the adsorption and activation capacity of N 2 and promote the separation efficiency of charge carrier pairs by accommodating photogenerated electrons under visible light through the mechanism of N -type semiconductors. Therefore, oxygen vacancies and heterojunction engineering of semiconductive nanomaterials provide a promising method for the rational design of photocatalysts to enhance the rate of ammonia synthesis under mild conditions.
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高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2023
·Vol. 46
·期 9
·1331-1340
·
IF 3.8
Yu Lishuang,Zou Cheng,Li Qingyun,Liu Zhaoming,Liu Youyan,Tang Aixing
Chemoenzymatic epoxidation of olefin mediated by lipase is a green and environmentally friendly alternative process. However, the mass transfer barrier and lipase deactivation caused by the traditional organic–water biphasic reaction system have always been the focus of researchers’ attention. To overcome these issues, we investigated the effects of reaction temperature and two important substrates (H 2 O 2 and acyl donor) on the epoxidation reaction and interfacial mass transfer. As a result, we determined the optimal reaction conditions: a temperature of 30 °C, 30 wt-% H 2 O 2 as the oxygen source, and 1 M lauric acid as the oxygen carrier. Additionally, by simulating the conditions of shaking flask reactions, we designed a batch reactor and added a metal mesh to effectively block the direct contact between high-concentration hydrogen peroxide and the enzyme. Under these optimal conditions, the epoxidation reaction was carried out for 5 h, and the product yield reached a maximum of 93.2%. Furthermore, after seven repetitive experiments, the lipase still maintained a relative activity of 51.2%.
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JOURNAL OF SEPARATION SCIENCE
·
2023
·Vol. 47
·期 1
·2300672
·
IF 3.1
Bing Li,Pan Jiao,Cheng Tang
In this study, a deep eutectic solvent (DES) extraction combined with a magnetic bead ligand affinity analytical method was developed and used for α-glucosidase inhibitor identification from Pueraria lobata . Several critical parameters affecting the analysis performance, including the type of DES, molar ratio, water amount, pH, salt concentration, and volume of DES, were investigated. The selected analytical sample preparation conditions were as follows. The composition of DES is choline chloride-1,4-butanediol (1:3), the water content is 40%, pH is 7.0 and the volume of extraction solution is 2 mL. The obtained sample extraction solution was analyzed directly using α-glucosidase immobilized magnetic beads (GMBs). Three α-glucosidase inhibitors in Pueraria lobata , including puerarin, daidzin, and daidzein, were identified. Luteolin was used as a positive control to evaluate the method's selectivity. Results showed it could selectively bond to the GMBs in the DES. As the affinity analysis was performed directly in a DES, the solution-removing process could be avoided. The intra-day and inter-day precisions of the method are 5.21% and 6.38%, respectively. The solvent amount was 1/50–1/2000 of that used in traditional methods.
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DESALINATION
·
2023
·
IF 9.9
Lin Wang,Fangkun Xiao,Haochen Ge,Yunbo Tong,Congjie Gao,Guiru Zhu
Organic solvent forward osmosis (OSFO) is a newly developing technology for recovering the organic solvent and concentrating substances. The commercial polyethylene (PE) battery separator is the ideal support for OSFO owing to the low structural parameter, resistance for organic solvents, commercially available and simple preparation process. A novel thin-film nanocomposite (TFN) membrane for OSFO was fabricated on the dopamine (DA)-modified PE support by adding α-cyclodextrin (α-CD) in the polyamide (PA) layer. The inclusion complexes (MPD@α-CD) formed by host-guest chemistry enhanced the stability of the membrane. Because of the Janus path and molecular sieving effect of α-CD, the TFN membrane exhibited superior permeability and selectivity among the recent reports. Moreover, the TFN membrane showed high rejection of Rhodamine B and Oxytetracycline , so it had great potential for solutes concentration . Herein, this work broadens the application of eco-friendly α-CD in membrane field and improves the PE composite membrane for OSFO process.
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ACS Applied Electronic Materials
·
2023
·
IF 4.7
Zhiyuan Chen,Peipei Han,Wenhui Chen,Zhi Wan,Jizhou Yang,Zhigang Liu,Peng Hu,Feng Teng,Haibo Fan
In recent years, Ga2O3 flexible solar-blind ultraviolet photodetectors (UVPDs) are gradually becoming the focus of research and the industry because of their excellent wearability, low manufacturing cost, portability, large area compatibility, and high scalability. However, the crystallization temperature required for high-quality α-phase Ga2O3 films exceeds the heat resistance of most flexible materials, so the growth of Ga2O3 films on flexible substrates is a very big challenge. In this study, a highly ordered α-Ga2O3 nanorod array and flexible solar-blind UV PDs with excellent performance were successfully prepared on a flexible titanium (Ti) substrate at 500 °C by a simple water bath heating method. When irradiated by 254 nm ultraviolet light, the α-phase Ga2O3 flexible photodetector exhibits an excellent self-power optical response at 0 V bias and exhibits excellent photoelectric performance with a responsivity of 15.3 mA/W, a fast rise and fall time of 0.104 and 0.077 s, a photocurrent density of 45.7 μA/cm2, and a high detectivity of 13.8 × 109 Jones. Bending and repeating experiments demonstrated that the detector had high stability. This study provides a simpler and less expensive method for the preparation of flexible self-powered α-Ga2O3 solar-blind UV photodetectors.
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EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2023
·Vol. 249
·期 8
·2017-2027
·
IF 3.3
Han Zai-Gang,Zhang Lingli,Qi Chao,Shi Qing,Min Jun Zhe
The detection and analysis of α-dicarbonyl compounds (α-DCs) in food can guide the daily diet of patients with various chronic diseases. However, these compounds have poor stability, lack color-generating groups, and have low ionization efficiency. Therefore, it is difficult to monitor them. We established a new simple and sensitive method for the simultaneous determination of four α-DCs, including glyoxal (GO), methylglyoxal (MG), 2,3-butanedione (DMGO), and 3-deoxyglucosone (3-DG) in beer by ultra-high-performance liquid chromatography–tandem mass spectrometry (UHPLC-MS/MS) with pre-column derivatization using 3-benzyl-2-oxo-4λ 3 -thiazolidine-4-carbohydrazide (BOTC), a novel MS probe for targeted identification of carbonyl compounds. α-DCs were derivatized with BOTC at 60 °C for 60 min, and the gradient analysis was carried out on a CSH C18 (2.1 mm × 50 mm; 1.7 μm) column for 5 min with a mobile phase A of 0.1% formic acid (FA) in water and mobile phase B of 0.1% FA in acetonitrile. The linearity range of this method was 0.39–500 μM ( R 2 ≥ 0.9995). The limits of detection (LOD) were in the range of 13–50 fmol. The average recoveries of α-DCs were 95.15–101.67%. This method was successfully applied to the detection of α-DCs in beer; the content of 3-DG was the highest, several hundred times higher than that of GO, MG, and DMGO, and the difference was significant. This new BOTC derivatization-based UHPLC-MS/MS method for the simultaneous detection of four α-DCs in beer is highly sensitive and can be used for the detection of α-DCs in alcoholic beverages. Graphical abstract
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Chen Chen,Xudong Zhang,Qiong Tang,Mingxing Tang,Xuekuan Li,Lei Liu,Jinxiang Dong
Using coal-based feedstocks to produce chemicals is of importance for the high value-added utilization of coal and the reduction of petroleum consumption. Alkyltetralins similar to naphthenic oil were successfully obtained through tetralin alkylation with various olefins. Various ionic liquids (ILs) were applied to catalyze alkylations, and Et 3 NHCl-AlCl 3 IL exhibited high catalytic activity under mild reaction temperature (80 °C), the selectivity of multi-alkyltetralins higher than 70% could be achieved at >99% tetralin conversion. Such catalyst was shown to be robust in the presence of trace water and oxygenated chemicals. COSMO-RS model was applied to predict the mutual solubility and interaction of tetralin, olefins and alkyltetralins in ILs. The experimental and calculated results demonstrated that the favorable interactions of shorter-chain olefins and ILs benefited to produce multi-alkyltetralins, and the low mutual solubility of reactants and products in ILs was helpful to the rapid separation of products in the system.
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MOLECULES
·
2023
·Vol. 28
·期 12
·4723
·
IF 4.6
Rongxiu Qin,Haiyan Chen,Rusi Wen,Guiqing Li,Zhonglei Meng
To investigate the synergistic catalytic effects of boric acid and α-hydroxycarboxylic acids (HCAs), we analyzed and measured the effects of the complexation reactions between boric acid and HCAs on the ionization equilibrium of the HCAs. Eight HCAs, glycolic acid, D-(−)-lactic acid, (R)-(−)-mandelic acid, D-gluconic acid, L-(−)-malic acid, L-(+)-tartaric acid, D-(−)-tartaric acid, and citric acid, were selected to measure the pH changes in aqueous HCA solutions after adding boric acid. The results showed that the pH values of the aqueous HCA solutions gradually decreased with an increase in the boric acid molar ratio, and the acidity coefficients when boric acid formed double-ligand complexes with HCAs were smaller than those of the single-ligand complexes. The more hydroxyl groups the HCA contained, the more types of complexes could be formed, and the greater the rate of change in the pH. The total rates of change in the pH of the HCA solutions were in the following order: citric acid > L-(−)-tartaric acid = D-(−)-tartaric acid > D-gluconic acid > (R)-(−)-mandelic acid > L-(−)-malic acid > D-(−)-lactic acid > glycolic acid. The composite catalyst of boric acid and tartaric acid had a high catalytic activity—the yield of methyl palmitate was 98%. After the reaction, the catalyst and methanol could be separated by standing stratification.Keywords:boric acid;α-hydroxycarboxylic acid;ionization equilibrium;fatty acid esterification;green synthesis
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高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Huajian Xu,Zongwei Hao,Jinglei Zhang,Huixia Liu,Changyue Deng,Zhenyu Yu,Mingming Zheng,Yingnan Liu,Yibin Zhou,Yaqing Xiao
This work focused on the pathways by which NCC regulated the digestibility of corn starch . The addition of NCC changed the viscosity of the starch during pasting, improved the rheological properties and short-range order of the starch gel, and finally formed a compact, ordered, and stable gel structure. In this respect, NCC affected the digestion process by changing the properties of the substrate, which reduced the degree and rate of starch digestion. Moreover, NCC induced changes in the intrinsic fluorescence, secondary conformation, and hydrophobicity of α-amylase, which lowered its activity. Molecular simulation analyses suggested that NCC bonded with amino acid residues (Trp 58, Trp 59, and Tyr 62) at the active site entrance via hydrogen bonding and van der Waals forces . In conclusion, NCC decreased CS digestibility by modifying the gelatinization and structural properties of starch and inhibiting α-amylase activity. This study provides new insights into the mechanisms by which NCC regulates starch digestibility, which could be beneficial for the development of functional foods to tackle type 2 diabetes.
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Environmental Science-Nano
·
2023
·Vol. 10
·期 5
·1428-1440
·
IF 7.3
Xixi Chen,Yanjun Li,Wanyi Fu,Shuanghong Tian,Yulong Yang,Kai Yang,Xuanbo Xu,Xihui Zhang
The importance of nonradical Fenton-like catalysis in environmental fields has motivated research for effective singlet oxygen (1O2) production, but realizing the accurate design and regulation of active sites for manipulating oriented 1O2 generation is still highly challenging. In this study, α-, β-, and γ-MnO2 catalysts with different oxygen vacancy (OV) abundance were fabricated to activate H2O2 to generate 1O2 for the degradation of oxytetracycline (OTC). The OV-rich α-MnO2 had a high OTC removal efficiency (>93.5%) at the pH range from 4.0 to 11.0. Moreover, α-MnO2 exhibited great applicability for a real water matrix, and the total removal of various kinds of emerging contaminants from hospital wastewater reached up to 97.4%. The excellent performances of α-MnO2 were attributed to the rich contents of OVs that induced the oriented generation of 1O2. Theoretical density functional theory (DFT) calculations validated that the OV-rich α-MnO2 had the highest H2O2 adsorption ability (−1.39 eV) and the lowest energy barrier (0.41 eV) for the dissociation of *OH to form the *O intermediate, which promoted the oriented formation of 1O2. This work provides a strategy of manipulating the oriented generation of 1O2 towards water decontamination via regulating the abundance of oxygen vacancies in α-MnO2 nanocatalysts.
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JOURNAL OF FOOD ENGINEERING
·
2023
·
IF 5.5
Chuye Ji,Muhammad Aslam Khan,Kaiwen Chen,Li Liang
Zein particles are potential for the encapsulation of bioactive compounds . Deoxyribonucleic acid (DNA) shows good pH stability and can complex with antioxidants. In this study, DNA and DNA-quercetin complexes was used as the coating layer of zein particles. Zein particles had a size of 85.10 nm and ζ-potential of −30.73 mV at 1 mg/mL DNA. Zein/DNA particles were stable at pH 4–9. Encapsulation efficiency of kaempferol and α-tocopherol in complex particles reached 92.90% and 97.02%, respectively. The potential use of zein/DNA particles was evaluated for protecting kaempferol. Moreover, DNA-quercetin complex coating was investigated to discuss the protection of α-tocopherol in zein particles. The DNA coating improved the storage stability of kaempferol or α-tocopherol by strengthening physical barrier. DNA-quercetin complexes further improved the stability of α-tocopherol by acting as antioxidant barrier. The retention of kaempferol and α-tocopherol was about 58% in zein/DNA and zein/DNA-quercetin particles at 45 °C after 28 days.
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ChemCatChem
·
2019
·Vol. 11
·期 5
·1518-1525
·
IF 4.495
Fengli Yu,Lihua Xie,Fangzhu Wu,Bing Yuan,Congxia Xie,Shitao Yu,Xien Liu,Lei Wang,Dan Wang
Graphical Take core ! Highly dispersed and stable Ru nanoparticle catalysts loaded on boron-doped amphiphilic, core-shell, mesoporous molecular sieves are successfully prepared and used to catalyze the hydrogenation of α-pinene to cis -pinane with an excellent catalytic activity, high selectivity, and good recyclability, in mild experimental conditions given that every nanocomposite is equivalent to a microreactor. Highly dispersed and stable catalysts comprising Ru nanoparticles supported on boron-doped amphiphilic core-shell mesoporous molecular sieves (MMS−C@MMS−NH 2 /B/Ru) with alkyl-modified hydrophobic silica core and NH 2 -functionalized hydrophilic silica shell are successfully prepared for use in hydrogenation of α-pinene for the first time. Dodecyl-modified MMS−C 12 @MMS−NH 2 /B/Ru exhibits the best catalytic activity under mild hydrogenation conditions. The abundant −NH 2 functional groups on the molecular sieve surface and their amphipathy allow the sieves to facilitate attachment of more Ru nanoparticles, and to simplify their dispersion in the water-organic reaction medium. Moreover, B-doped molecular sieves may adjust their acidity to meet the needs of α-pinene hydrogenation. Under mild reaction conditions (25 °C, 1 MPa H 2 , and 1 h), α-pinene can be completely converted with 99 % selectivity to cis -pinane, because every nanocomposite is equivalent to a microreactor. The catalytic activity does not change much over 5 cycles, indicating that Ru nanoparticles are stably loaded on the molecular sieves.
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