FOOD CHEMISTRY
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2023
·
IF 8.8
Peiye Liu,Jing Shen,Jiankang Cao,Weibo Jiang
Novel p -coumaric acid (pCA)-loaded nanoliposomes were prepared by the thin-film hydration method, assisted with ultrasonic treatment, and optimized by the response surface methodology. The characterization showed that the fabricated pCA-loaded liposomes were nanosized spherical vesicles (83.55 ± 0.34 nm), exhibiting favorable dispersibility and encapsulation efficiency (55.70 ± 0.10 %). Fourier transform infrared spectroscopy analysis indicated that pCA was encapsulated into phospholipid bilayer through hydrophobic interaction and hydrogen bonding. Tests of temperature stability and centrifugal stability suggested that pCA-loaded nanoliposomes were less sensitive to aggregation and fusion during storage. Incubation experiments revealed that pCA-loaded nanoliposomes had a good inhibitory effect on the expansion of disease area on fresh pod pepper fruit caused by Botrytis cinerea . Additionally, pCA-loaded nanoliposomes effectively extended shelf life of fresh pod peppers by reducing weight loss and naturally-infected decays. The findings presented a viable strategy for designing liposomal encapsulation technology to efficiently enhance antimicrobial activity of pCA in food preservation.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Zixuan Xue,Pengrui Zhang,Qian Zhang,Chaochi Huang,Ciming Wang,Lianjing Mao,Xiaolong Zhou,Huiqun Ju,Jinhe Sun,Fei Shao,Xingwu Zou,Bo Li,Mixiang Qi,Yongzhong Jia,Yan Jing
This paper reported a novel chelating agent and a green precipitation-extraction separation strategy for lithium isotope enrichment. 1-Hydroxy-4-(p-toluidino) anthraquinone and anisole were used as chelating agent and diluent, respectively. Three phases including organic phase, aqueous phase and precipitation could be preparated. The experiment indicated that excess sodium hydroxide was helpful to promote the single-stage precipitation rate and equilibrium time. The isotope result indicated that 6 Li was concentrated in the aqueous phase and 7 Li was concentrated in precipitation phase. The maximum single-stage lithium isotope speration factor reached to 1.013 ± 0.001. By doing thermodynamic analysis of the reaction, the free energy change (ΔG), enthalpy change (ΔH) and entropy change(ΔS) of the separation process were −8.97 J mol −1 , −21.37 J mol −1 and −0.0438 J mol −1 K −1 at 283 K. The results of DFT simulation and wave function analysis indicated that a lithium ion combined with a chelating agent anion formed a stable six-member ring between two oxygen, which was more stable than sodium ions combined with chelating agent anions (the Gibbs free energy of the lithium ions reaction was more negative). As interaction analysis result showed, the Li-O bond in complex interaction was significantly stronger than the Li-O bond interaction in aqueous phase, which was the theroy that led to the enrichment of 7 Li in organic phase. In the activated carbon treatment experiment, it was found that part of lithium chelator solved in aqueous phase, which resulted in that the lithium abundance of aqueous phase hardly changed. In order to increase the abundance of 6 Li in aqueous phase, it is necessary to add adjuvant to reduce the water solubility of lithium chelate. Overall, an economical and environmental-friendly precipitation method with a certain application prospect for lithium isotope separation was proposed, and the direction of improving the separation performance was pointed out in this paper.
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LANGMUIR
·
2023
·
IF 3.9
Yujia Tong,Changing Miao,Wenlong Ding,Fiona Hammond Quarcoo,Xiao Xiao,Hongjun Ji,Weixing Li,Xiaohui Ju
The current methods of constructing modification strategies for hydrophilic membranes are time-consuming, complex in operation, and poor in universality, which limit their application on membranes. In this work, inspired by the adhesion properties and versatility of caffeic acid (CA) and p-phenylenediamine (PPDA), a simple, rapid, and universal method was designed for the separation of oil-in-water emulsion by preparing a stable hydrophilic coating separation membrane. The preparation time of the membrane was shortened to 40 min. The developed PVDF–PCA/PPDA membrane showed superhydrophilic and underwater superoleophobic properties. When applied to petroleum ether-in-water emulsion, isooctane-in-water emulsion, and dodecane-in-water emulsion separation, the oil rejection was more than 99.0%. In the circulating separation of 10 g/L soybean oil-in-water emulsion, the oil rejection was more than 99.3%, and the highest flux was 1036 L·m–2·h–1. The prepared PVDF–PCA/PPDA membrane performed well in the separation test of oily wastewater. The proposed strategy is simple and rapid; it may become a universal method for preparing membranes with super strong antifouling properties against viscous oil and accelerate the research progress of membrane separation of oil-in-water emulsions.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xiong Peng,Li Chen,Shujun Liu,Lihua Hu,Jianwei Zhang,Aili Wang,Xiwen Yu,Zongcheng Yan
Organoarsenic compounds are considered as emerging pollutants since they may decompose into highly toxic arsenate in the environment. The adsorption of organoarsenic compounds by natural polymers has drawn research attention, but the adsorption mechanisms remain largely unexplored. In this study, the sorption interfacial interaction mechanisms of p -arsanilic acid on ionic liquid modified celluloses were investigated systematically by sorption models, spectroscopy analysis techniques, and density functional theory calculations. Adsorption experiments showed that the modified cellulose exhibited high adsorption capacity (216.9 mg/g) and fast adsorption rate (3.21 × 10 −3 g mg −1 ·min −1 ) toward p -ASA. Adsorption model studies revealed that the adsorption process was multilayer adsorption and dominated by the adsorption onto active site. The effect of environmental factors on p -arsanilic acid removal and spectroscopy analysis manifested that p -arsanilic acid interacted with the adsorbent through hydrogen bonding and π-π interaction to form outer-sphere complexes. Density functional theory calculation and independent gradient model analysis were used to analyze the interfacial interaction mechanisms, results of which showed that hydrogen bonding played the dominant role in the adsorption process and the imidazole group was preferential adsorption site. This work provides a valuable reference for understanding the role of weak force in the adsorption process between organoarsenic and adsorbents.
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CHIRALITY
·
2021
·Vol. 33
·期 4
·176-183
·
IF 2.437
Ling Gong,Shan Li,Zhengzhi Yin,Kelin Li,Jiawei Gu,Datong Wu,Yong Kong
Poly( p -aminobenzene sulfonic acid) (pABSA) was electrodeposited onto the surface of a glassy carbon electrode (GCE), which was then used for the preconcentration of l -tryptophan ( l -Trp) due to the electrostatic and π–π interactions between pABSA and l -Trp. Polypyrrole (PPy) was electrodeposited onto the surface of the l -Trp enriched pABSA, and then the l -Trp templates were removed, resulting in molecularly imprinted PPy/pABSA. To avoid the interference from the oxidation peak of PPy on the following electrochemical chiral recognition of Trp isomers, PPy was overoxidized by cyclic voltammetry (CV). The resultant molecularly imprinted overoxidized PPy (OPPy)/pABSA modified GCE exhibits higher affinity toward l -Trp than d -tryptophan ( d -Trp); that is, the oxidation peak current of l -Trp is greatly higher than that of d -Trp at the molecularly imprinted OPPy/pABSA modified GCE.
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RSC Advances
·
2021
·Vol. 11
·期 18
·10996-11003
·
IF 3.361
Mingxing Duan,Qingyan Cheng,Mingming Wang,Yanji Wang
A new noble metal-free Ni–Co–P/HAP (hydroxyapatite) amorphous alloy catalyst was synthesized by an impregnation-chemical reduction method; the structure and properties of the catalysts were characterized by XRD, SEM, BET, XPS and DSC. Based on the model of the hydrodeoxygenation (HDO) of vanillin to 2-methoxy-4-methylphenol (MMP) with formic acid as a hydrogen source, the catalytic performance of the catalyst was studied. The results found that the Ni–Co–P/HAP catalyst exhibited excellent catalytic activity for the in situ HDO reaction of vanillin compared with Ni–P and Ni–Co–P. The conversion of vanillin could be high to 97.86% with MMP selectivity of 93.97% under optimized reaction conditions. In addition, mechanism studies have shown that the side reaction of carbocation and vanillyl alcohol (HMP) condensation can be effectively reduced with increasing the hydrogenation rate, thereby the selectivity of MMP was effectively increased.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 8
·2298-2309
·
IF 3.174
Shizi Luo,Xinyan Xiao,Yi Wang,Mingli Lu
BACKGROUND The commonly used RhB dye is a carcinogen that is widely found in environmental matrices and poses a threat to aquatic biota and human health. However, conventional wastewater treatment processes do not effectively remove low concentrations of these pollutants. Herein, the P-Bi 4 O 5 Br 2 /AgI (PBA) heterojunction was synthesized via a polyvinylpyrrolidone (PVP)-assisted solvothermal and precipitation method in this work. RESULTS The photocatalytic efficiency of the PBA heterojunction was evaluated by degrading rhodamine B (RhB) with the irradiation of simulated sunlight. P-Bi 4 O 5 Br 2 /AgI-50 (PBA-50, the mass fraction of AgI in the composite was 50%) composite could degrade 98% RhB under 90 min irradiation of 500 W Xenon lamp, and its pseudo first-order reaction rate constant was 0.04265 min −1 , which was 17.1, 2.16, and 2.94 times higher than that of Bi 4 O 5 Br 2 , P-Bi 4 O 5 Br 2 , and AgI, respectively. Besides, the effects of the dosage of photocatalyst and the anion on the photocatalytic degradation of RhB over PBA-50 were analyzed. CONCLUSION The enhanced photocatalytic activity of PBA was attributed to its better visible light capture ability, larger specific surface area, and faster photogenerated carrier separation efficiency, all of which were confirmed by scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), UV-Vis diffues reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical analysis. In addition, the free radical trapping experiments confirmed that ·O 2 − and h + were the main active species for degradation of RhB. Additionally, the smaller bandgap and the more negative conduction band position of Bi 4 O 5 Br 2 were reached after the introduction of PVP. Accordingly, a possible type-II heterojunction photocatalytic mechanism of P-Bi 4 O 5 Br 2 /AgI was proposed. © 2021 Society of Chemical Industry (SCI).
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao-Lin Wei,Jie Bu,Shi-Shui Zhou,Mao-Cheng Deng,Ming-Jun Zhu
This study aimed to develop a promising biorefinery technology for the value-added utilization of herb residues by using ionic liquid (IL) assisted by aromatic acid ( p -toluenesulfonic acid, TsOH) pretreatment. The result showed that the addition of low concentration of TsOH into IL could effectively deconstruct the recalcitrant intercellular structure of herb residues and rapidly extract the lignin fraction. Under the optimum conditions (79% IL, 1.0% TsOH, and 20% H 2 O at 130 °C and 2 h), the highest cellulose recovery yield of 96.4%, the lignin removal rate of 79.9% and ideal saccharification yield of 98.9% were achieved. Moreover, the main byproduct lignin exhibited comparable yield, high purity, and thermal stability, suggesting the potential application in the conversion of bio-based chemicals and materials. Furthermore, the IL was successfully recycled three times and the recovery rate was at least 95% each time. High saccharification yields and lignin recovery were maintained during all cycles. The hemicellulose-derived saccharides were the main impurities detected in the recycled IL. Overall, this work presents a novel green pretreatment process that can effectively utilize herb residues.
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Nano Materials Science
·
2021
·
IF 0
Ning You,Shuai Cao,Mengqiu Huang,Xiaoming Fan,Kun Shi,Haijian Huang,Zhangxian Chen,Zeheng Yang,Weixin Zhang
Improving catalytic activity and durabilty through the structural and compositional development of bifunctional electrocatalysts with low cost, high activity and stability is a challenging issue in electrochemical water splitting. Herein, we report the fabrication of heterostructured P-CoMoO 4 @NiCoP on a Ni foam substrate through interface engineering, by adjusting its composition and architecture. Benefitting from the tailored electronic structure and exposed active sites, the heterostructured P-CoMoO 4 @NiCoP/NF arrays can be coordinated to boost the overall water splitting. In addition, the superhydrophilic and superaerophobic properties of P-CoMoO 4 @NiCoP/NF make it conducive to water dissociation and bubble separation in the electrocatalytic process. The heterostructured P-CoMoO 4 @NiCoP/NF exhibits excellent bifunctional electrocatalysis activity with a low overpotential of 66 mV at 10 mA cm −2 for HER and 252 mV at 100 mA cm −2 for OER. Only 1.62 V potential is required to deliver 20 mA cm −2 in a two-electrode electrolysis system, providing a decent overall water splitting performance. The rational construction of the heterostructure makes it possible to regulate the electronic structures and active sites of the electrocatalysts to promote their catalytic activity.
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Materials Advances
·
2021
·Vol. 2
·期 12
·3927-3939
·
IF 0
Ya-Fang Zhang,Ben Dai,Dan Zhao,Di-Hui Zhang,Meng-Xing Xu,Xiang-Hua He,Chao Chen
To span the inherent application limitation of state-of-the-art catalysts for the chemical transformation of biomass derivatives, here, we formulate a series of Pr–Ni–P catalysts for the hydrogenation transformation of biomass-derived levulinic-acid, furfural and maleic anhydride. With comprehensive characterizations, Pr–Ni–P samples are verified as (PrPO4)m/Ni2P nanocomposites with a molar ratio (m) in the range of 0.24–11.0. In comparison with the poor catalytic performance of Ni2P, a ten-fold enhancement in TOF up to 0.45 s−1 and at least five-time promotion on the yield of objective products up to 91–98% are achieved by introducing proper amounts of PrPO4 to form reusable (PrPO4)m/Ni2P nanocomposites. Surface chemistry and kinetic mechanism studies further disclose that the cooperative catalytic function of two components, in particular the exclusive capability of PrPO4 to activate hydrogen, is responsible for the promoted hydrogenation transformation of biomass derivatives via a quick Langmuir–Hinshelwood process over (PrPO4)m/Ni2P. These findings imply that an easily obtainable, cost-affordable and robust rare earth phosphate like present PrPO4 could be a potential replacement catalytic component for the traditional metal catalyst in the hydrogenation transformation reactions of biomass derivatives, which was also worth noting as a new kind of basic material for other green mass-transformation techniques involving hydrogen activation processes such as corresponding optical and electrical transformations.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 42
·15422-15432
·
IF 4.39
Dong Qiu,Chengli He,Yuxuan Lu,Qiaodan Li,Yang Chen,Xiaoli Cui
Photoelectrochemical water splitting is an excellent strategy for hydrogen generation and it is pivotal to the development of photoanodes with sufficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In this work, we rationally constructed a γ-graphyne/TiO2 (GY/TiO2) p–n heterojunction in which p-type γ-graphyne nanosheets were distributed in the three-dimensional space surrounding TiO2 nanotube arrays. The GY/TiO2 photoanode achieves a photocurrent density of 0.75 mA cm−2 at 1.23 V (vs. RHE), 1.7 times that of bare TiO2, and extends the electron lifetime of TiO2 from 0.51 to 1.16 ms. The improvement arises from moderate γ-graphyne modification, contributing to broadened light absorption, the suppressed recombination of electron–hole pairs, an increase in charge transfer, and a higher injection efficiency of surface electrons. This work provides a reliable approach for the utilization and conversion of sustainable solar energy.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 40
·19032-19042
·
IF 3.591
Chengmin Hou,Hanxiao Ma,Congjun Cao,Xiaojian Ding,Jingting Duan
The composite particles (St/Fe3O4) of starch and Fe3O4 were prepared by a co-precipitation method. Then AA and HEMA were grafted and cross-linked on St/Fe3O4 by a one-step method to obtain St/Fe3O4-g-p(AA-r-HEMA). The effects of the adsorbent dosage, pH value, initial Cu(II) concentration, time and temperature on adsorption were studied. Experiments showed that St/Fe3O4-g-p(AA-r-HEMA) showed a good adsorption performance for Cu(II), with a unit adsorption capacity of 75.5 mg g−1 and a maximum removal rate of 95.0%. The adsorption process followed the Langmuir model and the pseudo-second-order kinetic model, was dominated by chemical adsorption, and belonged to single-layer adsorption. Renewable performance studies showed that after 8 adsorption cycles, 91.2% of the first adsorption effect was still retained.
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