COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xin-Hao Yu,Fu-Zhen Zhou,Yong-Kang Xi,Xiao-Nan Huang,Shou-Wei Yin,Xiao-Quan Yang
Water-in-oil (W/O) emulsions have numerous applications in many industries like foods, pharmaceuticals, in particular biphasic bio-catalysis. However, most of them are stabilized by surfactants or synthetic particles, which lead to limited uses in foods. Here, a W/O type Pickering emulsion was successfully prepared firstly by ordered ethyl cellulose-chitosan complex particles (ECCPs) and used for a recyclable biocatalytic micro-reactor. The performances of emulsions with different ethyl cellulose-chitosan ratios, water phase fraction and particle concentration were discussed. The type of emulsions could be shifted from W/O to W/O/W and O/W as water fraction increased. Interestingly, a recyclable bio-catalytic microreactor platform was constructed using such novel W/O emulsions, and the activity of lipase was significantly increased by encapsulating it into Pickering emulsions, and was 6.3-times higher than that of free lipase in biphasic system. In particular, the encapsulated lipase remained stable and could be recycled over 15 times without the loss of activity.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
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IF 9.8
Sheng-nan Li,Hao Wu,Rui-quan Hou,Jing-tong Zhou,Su-kun Lin,Kun-yu Zhao,Rui-fei Wang,Su-qing Huang,Zhi-xiang Zhang
O -Carboxymethyl chitosan nanoparticles ( O -CMC-NPs), which are organic pesticide carriers, have excellent application potential. Exploring the effects of O -CMC-NPs on non-target organisms, such as Apis cerana cerana , is critical for their effective application; however, such studies are limited. This study investigated the stress response of A. cerana Fabricius after O -CMC-NPs ingestion. The administration of high O -CMC-NP concentrations enhanced the activities of antioxidant and detoxifying enzymes in A. cerana , with the activity of glutathione- S -transferase increasing by 54.43 %–64.33 % after one day. The transit of O -CMC-NPs into the A. cerana midgut resulted in their deposition and adherence to the intestinal wall, as they cluster and precipitate in acidic conditions. The population of Gillianella bacteria in the middle intestine was remarkably reduced after 6 d of administration of high O -CMC-NP concentrations. Contrastingly, the abundance of Bifidobacteria and Lactobacillus in the rectum significantly increased. These results indicate that the intake of high concentrations of O -CMC-NPs causes a stress response in A. cerana and affects the relative abundance of crucial intestinal flora, which may pose a potential risk to the colony. This implies that even nanomaterials with favorable biocompatibility should be applied reasonably within a specific range to avoid adverse effects on the environment and non-target organisms in the context of large-scale research and promotion of nanomaterials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Shaolong Wang,Dingding Ye,Hao Liu,Xun Zhu,Zhenfei Liu,Rong Chen,Qiang Liao,Yang Yang
The in-situ H 2 O 2 electrosynthesis by two-electron oxygen reduction reaction employing renewable electricity is a promising alternative to traditional anthraquinone process due to its security, environmental friendliness and excellent cost effectiveness, which requires high-performance, cost-effective and environmental-friendly electrocatalysts . A bamboo-derived O-doped rocky electrocatalyst is developed by facile pyrolysis and acid treatment for high-efficiency electroreduction of O 2 to H 2 O 2 . Three-dimensional interconnected hierarchical pores in rocky electrocatalysts expose abundant electroactive sites and facilitate mass transfer of reaction species. From the results of rotating ring-disk electrode test, a H 2 O 2 selectivity up to 80% and superior electrocatalytic activity of the prepared electrocatalyst are achieved by surface oxygen functionalization induced by acid treatment. At the optimal catalyst loading of 2 mg cm −2 , prominent H 2 O 2 productivity of 1037 mmol g c a t a l y s t − 1 h − 1 with high current efficiency up to 74.1% is achieved at 30 mA cm −2 by air-breathing cathode. Higher H 2 O 2 productivity (1525 mmol g c a t a l y s t − 1 h − 1 ) is yielded by further raising the current density to 50 mA cm −2 . Moreover, the durability test of the cathode through ten consecutive runs demonstrates its great stability for electrocatalytic generation of H 2 O 2 . This work inspires the development of promising biomass-derived electrocatalysts for green and sustainable on-site H 2 O 2 electrosynthesis.
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MINERALS ENGINEERING
·
2021
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IF 4.765
Huifang Yang,Kaihua Huang,Xiaoyu Cao,Xiaoping Huang,Zhanfang Cao,Hong Zhong,Hu Zhou,Jianxian Zeng,Jianrong Xue,Rui Zhang
The flotation performance and hydrophobic mechanism of O-ethyl-N-benzoyl thionocarbamate (EBZTC) on chalcopyrite were first estimated by single flotation experiments, batch adsorption experiments, contact angle measurements, DFT calculation and FTIR analysis. Single flotation experiments illustrated that a flotation recovery of 96.7% was achieved to chalcopyrite when EBZTC was used compared to 90% with SIBX at pH 6.5. Adsorption experiments indicated that the adsorption process of EBZTC on chalcopyrite surface was an exothermic monolayer chemisorption process. Hydrophobic mechanism demonstrated that EBZTC chemisorbed onto the chalcopyrite surface through the chemical reactions of C O and C S groups to the copper species with the formation of C O Cu and C S Cu bonds, which resulted in the coverage of the hydrophobic groups of EBZTC onto the chalcopyrite surface to enhance its hydrophobicity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Zhiliang Jin,Teng Li,Kai Wang,Xin Guo
Simple high-temperature calcination and hydrothermal methods were followed to synthesize CeO 2 and Mo-S, respectively. The efficient photocatalytic hydrogen evolution activity exhibited by the composite catalysts can be attributed to the edge active sites in Mo-S. The Mo-O bonds formed between CeO 2 and Mo-S could further accelerate the processes of separation and migration of electrons between the catalyst interfaces. The hybrid catalyst 10%-CeO 2 /Mo-S exhibiting the best hydrogen generation ability (4.3 mmol h −1 g −1 ) was obtained by optimizing the content of CeO 2 in CeO 2 /Mo-S. Analysis of the PL spectral profile and photocurrent response recorded for the system revealed that 10%-COMS exhibited excellent photogenerated carrier separation ability. Analysis of the LSV and EIS curves revealed that 10%-COMS exhibited the optimal hydrogen production potential. The charge migration resistance provided by the systems was lower than the charge migration resistance provided by CeO 2 and Mo-S. The synergism between the S-scheme heterojunctions and the Mo-O bonds helped accelerate the separation and migration of photo-induced carriers at the catalyst interfaces. The introduction of covalent bonds in the S-scheme heterojunctions and the results presented herein can potentially help develop a new method to realize photocatalytic hydrogen evolution.
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GREEN CHEMISTRY
·
2023
·Vol. 25
·期 23
·10091-10100
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IF 9.8
Mo Zhang,Zheng Li,Yeqin Feng,Xing Xin,Guo-Yu Yang,Hongjin Lv
Selective hydrogenolysis of abundant C–O bonds of β-O-4 linkages in natural lignin or lignin models has been considered as a key strategy for the generation of value-added organic chemicals. Herein, we report a mild, efficient, and selective photocatalytic strategy for hydrogenolytic cleavage of lignin β-O-4 models by using Ni-containing polyoxometalate (POM) catalysts and CdS quantum dots. Upon blue LED light irradiation, the present photocatalytic system can effectively transform various lignin β-O-4 models to the corresponding hydrogenolysis products (phenols and ketones) with >95% conversion and >93% product selectivity. A tentative photocatalytic mechanism is proposed based on various experimental and spectroscopic analyses. The facile strategy presented in our work could be extended to the photocatalytic preparation of various value-added chemicals from natural biomass or other biomass derivatives in the near future.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Jie Hu,Xueqing Xiong,Wangwang Guan,Yong Chen,Haizhu Long
In this study, a hierarchical Fe 2 O 3 -Co 3 O 4 heterojunction with abundant oxygen vacancies was fabricated by a MOF-assisted strategy combing with a thermal treatment process. The morphology, nanostructure and other properties of the synthesized samples were comprehensively investigated by related characterizations. The results display that the Co 3 O 4 modified with Fe 2 O 3 nanorod exhibits an admirable mesoporous structure and abundant oxygen vacancies. In addition, the gas sensing devices were constructed by as-prepared samples and demonstrated that the gas sensor based on Fe 2 O 3 -Co 3 O 4 composites shows excellent gas sensitivity of 91.5 towards 100 ppm acetone at a working temperature of 200 °C, with a short response-recovery time of 20/21 s. Meanwhile, the sensor possesses good reproducibility and long-term stability (over 30 days), and outstanding selectivity towards acetone gas. Exploration into a convincing gas sensing mechanism confirms that fabricating of p-n heterojunction architecture, regulating of oxygen vacancies and designing of mesoporous structure synergistically induced the excellent gas sensing performance. Therefore, this work can offer a promising strategy to enhance acetone sensing response of Fe 2 O 3 -Co 3 O 4 in practical applications.
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ACS Catalysis
·
2023
·
IF 12.9
Shuai Xu,Qi Gao,Ziyan Hu,Yitong Lu,Yanlin Qin,Yuliang Li
The selective breaking of the Cβ–O bond has great potential for the conversion of lignin into high-value aromatic monomers. In the present work, we designed a CdS–SH/TiO2 heterojunction photocatalyst for the efficient selective breaking of the Cβ–O bond. The surface modification of CdS by –SH promoted close contact between the catalyst and lignin and further promoted the Fermi level matching with TiO2. A type-II heterojunction was constructed by CdS–SH and TiO2 nanosheets to enhance the light absorption range and further increase the separation of photogenerated electron–hole pairs, resulting in high catalytic activity. Finally, 85% phenol and 87% acetophenone yields were obtained under mild light irradiation using 2-phenoxy-1-phenylethanol as the model substrate. Several control experiments, along with DFT calculations, indicate that the reaction pathway is more likely to involve the oxidation of Cα–OH to form Cα═O initially, followed by the activation of Cβ–O, which is then reduced to further form aromatic monomers. This work achieves the efficient selectivity of lignin depolymerization and provides a reference for the design of heterojunction photocatalysts in the valorization of lignin.
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Ruoning Zhang,Yanhui Zhang,Jingjing Yu,Yanxiang Gao,Like Mao
Understanding the thermal behavior of emulsions with complex structures was crucial for wider applications. However, the correlations between the structural units and emulsion properties at different temperatures are poorly understood. Herein, W/O emulsions stabilized by oleogels and nanoparticles were studied during thermal process, and dynamic interactions among the structural units occurred at micro-, meso-, and macroscales. Results revealed that the thermal behavior of W/O emulsions shifted from stable (25–50 °C) to sub-stable (50–60 °C), and unstable states (60–80 °C). Microstructural analysis confirmed that the particles desorbed from the interface and dissolved in the oil phase after heating, causing water droplet coalescence in the emulsions. This was attributed to the enhanced hydrophobic interactions between the particle dispersions and the oleogel, as the contact angle and interfacial tension were decreased during heating. At the mesoscale, the T 2 values of oleogels and nanoparticle dispersion were increased more than three times from 25 °C to 80 °C, leading to the higher mobility of protons in emulsions. At the macroscale, the viscoelastic modulus of emulsions at higher temperature were higher, together with less energy dissipated by friction and increased nonlinear response. Furthermore, the temperature-induced transformation of emulsion stability can be reversibly controlled at least three times. Insights into the complex behavior of emulsions across different temperature stages can inspire the design of emulsions for specific applications.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 20
·11736-11748
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IF 4.22
Gao Yuan,Zhou Xinghai,Zhang Maliang,Li Zhenhuan
In view of the disadvantages of concentration polarization and trade-off effects in the application of membrane in desalination field, oxide-nano graphene oxide/polyamide (O-NGO/PA) loose intermediate layer and PA ultra-thin dense layer were introduced to fabricate PA/O-NGO/polyphenylene sulfide composite membrane with sandwich structure via multi-step interfacial polymerization (MS-IP) method. The selective permeation mechanism of ultrathin layer produced by different aqueous monomers (PIP and MPD) was studied, the effect of its physicochemical structure on the relief of concentration polarization phenomenon and the breakthrough of trade-off effect was analyzed. The ultra-thin and dense PA layer mainly played the role of interception and shortened the water molecular penetration path. In the retention test of metal salt solution, compared with the rough surface, it was found that the smooth surface was more conducive to the diffusion of intercepted metal ions into the feed solution, thus alleviating the concentration polarization phenomenon. Graphical abstract
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yilan Wu,Chan Lei,Jing Li,Yijie Chen,Hongshan Liang,Yan Li,Bin Li,Xiaogang Luo,Ying Pei,Shilin Liu
This study was designed to improve the stability of medium internal phase emulsion by adjusting the electrostatic interaction between gelatin (GLT) and TEMPO-oxidized bacterial cellulose nanofibrils (TOBC). The influences of polysaccharide-protein ratio (1:10, 1:5, and 1:2.5) and pH (3.0, 4.7, 7.0, and 11.0) on the emulsion properties were investigated. The droplet size of TOBC/GLT-stabilized emulsion was increased with the TOBC proportion increasing at pH 3.0–11.0. Additionally, emulsion had a larger droplet size at pH 4.7 (the electrical equivalence point pH of mixtures). However, the addition of TOBC significantly improved the emulsion stability. The emulsions prepared with TOBC/GLT mixtures (mixing ratio of 1:2.5) at pH 3.0–7.0 were stable without creaming during the storage. It was because the formation of nanofibrils network impeded the droplet mobility, and the emulsion viscosity and viscoelastic modulus were increased with the addition of TOBC. These findings were meaningful to modulate the physical properties of emulsions.
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Materials Science & Engineering C-Materials for Biological Applications
·
2020
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IF 5.88
Zideng Dai,Xinyu Xu,Zhaoming Guo,Kun Zheng,Xue-Zhi Song,Xiuyu Qi,Zhenquan Tan
Ultra-thin two-dimensional nanosheets have attracted increasing attention due to their great application prospects in nanomaterial science and biomedicine. Herein, we report the preparation of exfoliated raw and oxidized 4-layer Ti 7 O 13 (O-Ti 7 O 13 ) and their ability to produce reactive oxygen species (ROS). The results show that O-Ti 7 O 13 nanosheets can effectively produce ROS induced by X-ray irradiation. The 4-layer nanosheets can quickly load doxorubicin (DOX) within 5 min with a high loading rate to obtain a novel nanodrug system through their electrostatic adsorption capacity, and they exhibit a sustained release behavior. In this way, chemotherapy, radiation therapy and photodynamic therapy effectively combine for cancer synergistic treatment. We evaluated the cytotoxicity, cellular uptake and intracellular location of the O-Ti 7 O 13 nanosheet-based drug delivery system in A549 lung cancer cells. Our results show that the O-Ti 7 O 13 /DOX complex is more cytotoxic to A549 cells than free DOX since a low concentration of loaded DOX (10 μg/mL) with a low dose of X-rays can cause the complete apoptosis of tumor cells. This work reveals that the therapeutic effect of DOX-loaded O-Ti 7 O 13 nanosheets is strongly dependent on their loading mode, and the effects of chemotherapy and photodynamic therapy are enhanced under X-ray irradiation, which allows O-Ti 7 O 13 nanosheet use as a photo-activated drug carrier. This work provides a new strategy for preparing 2D metal oxide nanosheets toward biomedical applications.
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