STARCH-STARKE
·
2021
·
IF 2.741
Qifeng Chen,Yunjia Wang,Fushou Yin,Wenxiong Wang,Guangxue Chen,Peisheng Lin
Medical dressings require good antibacterial and mechanical properties. Polyvinyl alcohol based medical dressings are commercially available, and the antimicrobial properties of chitosan and cerium ions are known, and nanocellulose possesses excellent comprehensive properties, such as non-toxicity, biocompatibility, and biodegradability. In this study, polyvinyl alcohol-chitosan/cerium-nanocellulose (PVA-Cs/Ce-CNF) composite hydrogels are prepared by a freeze-thaw method and characterized by scanning electron microscope and X-ray diffraction. It is expected to improve antibacterial activity of the composite hydrogels by adding a small amount of cerium, and their biological activity will not be affected. In addition, the effects of chitosan/cerium (Cs/Ce) complexes and nanocellulose with different contents on properties are investigated. The results show that PVA-Cs/Ce-CNF composite hydrogels have a 3D, highly porous structure with distributed pores of 8–30µm, good skin viscosity, efficient ability to absorb fluid, and suitable water vapor transmission rate of 2000—2500 g m −2 day −1 . Two hydrogels in specific ratio show good strong tensile strength of 132.6 and 130.1 kPa respectively, and their elongation at break are over 400%. The PVA-Cs/Ce-CNF composite hydrogels are non-toxic, and they have inhibitory effect on Escherichia coli and Staphylococcus aureus . These results suggest that the PVA-Cs/Ce-CNF composite hydrogels have great potential as medical dressings.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Xinfa Cai,Meijuan Liang,Fei Ma,Zhaowei Zhang,Xiaoqian Tang,Jun Jiang,Can Guo,Sherif Ramzy Mohamed,Amira Abdel Goda,Dawood H. Dawood,Li Yu,Peiwu Li
Lateral flow immunoassay (LFIA) is the most effective real-time detection method for aflatoxin B 1 (AFB 1 ). Here, we constructed a nanozyme-strip based on MnO 2 nanosheets (MnO 2 NSs) as a catalytic label for detection of AFB 1 . By taking advantage of the MnO 2 -TMB catalytic amplified system, the new test achieves rapid detection with high sensitivity and ultrawide range. The limit of detection of the assay was 15 pg mL −1 , which was over 100-fold lower than the maximum limit set by the European Union (EU) of AFB 1 in foods. In addition, the strip test could offer 7 dynamic detection ranges, spanning 4 orders of magnitude, which could cater to the varieties of limits on AFB 1 residues in foods and feeds set by different countries. The estimated recoveries were in the range of 85.67%-106.38% with coefficients of variations (CVs) less than 9.68%. Overall, the developed approach is a rapid, reliable, sensitive and widely available tool for on-site detection of AFB 1 .
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Li Li,Zhi Huang,Yanying Liu,Ziqi Zhu,Mingjun Xu,Wenxuan Wei,Qian Zhang,Junming Hong
Novel porous Mn-Fe nanocubes (p-MnFe NCs) with abundant oxygen vacancies, which derived from Mn-Fe prussian blue analogue, were fabricated for the first time through annealing at H 2 atmosphere. Among the different molar ratios of Mn/Fe, p-Mn 1 Fe 1 NCs possessed abundant oxygen vacancies and exhibited excellent performance for peroxymonosulfate (PMS) activation to effectively degrade bisphenol A (BPA). As a result, 100% BPA (20 mg/L) degradation efficiency can be achieved within 30 min in the p-Mn 1 Fe 1 NCs/PMS system. SO 4 •− , HO•, O 2 •− and 1 O 2 were confirmed as main reactive oxygen species during catalytic reaction. The exposed Mn and Fe sites on the surface of p-Mn 1 Fe 1 NCs were the main active sites for the generation of reactive radicals. For non-radical generation pathway, the generated 1 O 2 and O 2 •− mainly originated from the reaction between dissolved oxygen and surface oxygen vacancies, and parts of 1 O 2 originated from the formation of intermediate O 2 •− . Radical and non-radical pathways were proposed in the p-Mn 1 Fe 1 NCs/PMS system for insights into the mechanisms of BPA degradation. Finally, the possible degradation pathways were proposed via ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UPLC-TOF-Q-MS) analysis.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Peng Zhang,Cheng Peng,Hui Li,Jing Huang,Yan Wang,Youqing Yu,Shimin Ding,Songli Liu,Yanchun Zhao
Reactive species, such as hydroxyl radicals (·OH), holes (h + ) and superoxide radicals (·O 2 − ), are considered as the main active substances involved in the photocatalytic degradation of organic pollutants. However, to the best of our knowledge, the effect of the photon energy on the generation of these species has never been examined in detail. In this study, the photocatalytic production of ·OH, h + and ·O 2 − over niobium pentoxide (Nb 2 O 5 ) was investigated as a function of the excitation wavelength. The ESR results clearly show that all three active species can be generated at 355 nm for both pure and C-doped Nb 2 O 5 . At 532 nm, which is well beyond the absorption edge of Nb 2 O 5 (399 nm), only h + and •O 2 − are produced over pure Nb 2 O 5 , while at the same time all three species can be produced over C-doped Nb 2 O 5 . The results of the trapping experiments indicate that •O 2 − and h + are the main reactive species that are responsible for the photocatalytic degradation. The photogenerated holes play a crucial role in the wavelength range of 365–420 nm but become less active with increasing wavelength. •O 2 − shows little dependence on wavelength and is consistently active at all wavelengths between 365 and 630 nm, in particular, for C-doped Nb 2 O 5 . It is concluded that the presence of localized states within the forbidden gap has a profound impact on the photocatalytic activity in the visible-wavelength region.
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ChemSusChem
·
2021
·Vol. 15
·期 4
·e202102455
·
IF 8.928
Xingwang Lan,Juan Wang,Qing Li,Aiqing Wang,Yize Zhang,Xianheng Yang,Guoyi Bai
Graphical Building bridges : Acetylene or vinylene-bridged π-conjugated covalent triazine polymers, A-CTP-DPA and V-CTP-DPE, are fabricated toward metal-free photocatalytic oxidation under visible light irradiation. Impressively, compared to the one without acetylene or vinylene bridge, A-CTP-DPA and V-CTP-DPE exhibit superior activity in photocatalytic selective oxidation of sulfides and oxidative coupling of amines. Solar-driven photocatalytic chemical transformation provides a sustainable strategy to produce valuable feedstock, but designing photocatalysts with high efficiency remains challenging. Herein, two acetylene- or vinylene-bridged π-conjugated covalent triazine polymers, A-CTP-DPA and V-CTP-DPE, were successfully fabricated toward metal-free photocatalytic oxidation under visible light irradiation. Compared to the one without acetylene or vinylene bridge, both resulting polymers exhibited superior activity in photocatalytic selective oxidation of sulfides and oxidative coupling of amines; in particular, A-CTP-DPA delivered an optimal photocatalytic performance. The superior activity was attributed to the broadened spectral response range, effective separation, rapid transportation of photogenerated charge carriers, and abundant active sites for photogenerated electrons due to the existence of the acetylene bridge in the framework. This work highlights the potential of acetylene and vinylene bridges in tuning catalytic efficiency of organic semiconductors, providing a guideline for the design of efficient photocatalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chao Liu,Chunqin Huang,Yu Li,Yuqian Liu,Huiyang Bian,Zhouyang Xiang,Huijie Wang,Hao Wang,Huining Xiao
Cellulose aerogels exhibit biocompatibility and biodegradability , rendering them promising candidate for application in building energy conservation and insulation materials. However, the intrinsic inflammability of pristine cellulose aerogel causes unneglectable safety concerns, hindering their application in energy-efficient buildings. Herein, a thermal insulating, fire-retardant, strong, and lightweight aerogel was produced via freeze-casting suspensions of cellulose nanofibril (CNF) and l -glutamine functionalized boron nitride nanosheets (BNNS-g). The aerogel with a BNNS-g:CNF concentration ratio of 15:5 exhibited outstanding mechanical strength owing to the strong interaction between BNNS-g and CNF as well as satisfactory thermal insulating performance (0.052 W/m·K). Particularly, this aerogel showed excellent fire-retardant and self-extinguishing capabilities in the vertical burning test, which remained unscathed after over 60 s of burning in a butane flame. Further, the limit oxygen index (LOI) of this aerogel was 36.0 %, which was better than the LOIs of traditional petrochemical-based insulating materials. This study provides a promising strategy for producing aerogels with excellent properties using cellulose and other inorganic nano-fillers.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jing Wang,Qingfeng Fan,Lidong Kou,Huan Chen,Xing Xing,Wenjie Duan,Kai Jiang
Oxygen vacancies (OVs) and heterostructures of photocatalysts play crucial roles in photocatalysis driven by visible light. In this study, a novel photocatalytic textile was prepared by spraying heterostructures of OVs-rich bismuth oxide (BiO 2-x ) and urea-derived graphitic carbon nitride (UCN) on amine group-modified poly(acrylonitrile) nonwoven textile (APAN), and then studied for sulfamethazine (SMT) removal and bacterial ( S. aureus ) disinfection under irradiation of energy-efficient white light emitting diodes (LEDs). The optimal BiO 2-x , prepared within a much shorter time (i.e. 1 h), was actually a ternary mixture of NaBiO 3 -Bi 2 O 3 -BiO 2-x with rich OVs rather than pure BiO 2-x . Incorporation of UCN could help redistribute electrons and induce formation of more OVs, thereby improve the photocatalytic activity of the BU-0.2 hybrid (i.e. mass ratio of BiO 2-x /UCN = 1:0.2). The BU-0.2 could use full-spectrum white light (i.e. 380–760 nm) to achieve superior SMT removal in a wide pH range (pH 5.0–9.0) and in the co-presence of common water constituents. The enhanced photocatalytic performance of BU-0.2 was attributed to the formation of OVs and heterostructure, which could broaden light absorption, help charges separation, and favor adsorption and activation of molecular O 2 . Detection of reactive species demonstrated that 1 O 2 and holes were the dominant factors responsible for SMT removal. Spraying deposition of BU-0.2 on APAN could endow the resultant textile (i.e. APAN-BU-0.2) with excellent photocatalytic activity for SMT removal and bacterial disinfection under LED white light irradiation. The as-prepared photocatalysts showed promising application prospects in purification of emerging pollutants utilizing LED white light.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 98
·期 10
·2597-2609
·
IF 3.4
Jun Chen,Xiaohong Yang,Shangqing Xia,Xue Li,Yutong Wang,Zongsheng Zhan,Mingxia Du,Dongliang Shao
BACKGROUND Persulfate (PS) has the capability to yield free radicals via activators, thereby shaping an advanced oxidation process that can significantly contribute to effective sterilization. Central to this technology is the pursuit of appropriate activators. RESULTS In our research, we successfully synthesized an economical and efficient PS activator, namely a pyrrhotite-loaded sludge carbon (Pyr-SC) composite. This was achieved via a straightforward procedure utilizing two environmentally friendly and cost-efficient raw materials: pyrite and sludge. Pyr-SC exhibited a specific surface area of 60.4 m 2 g −1 and rich functional groups such as carbon–sulfur and sulfur–oxygen. The magnetic and graphitic carbon structures were formed at high temperatures during the preparation process, and the sludge carbon (SC) exhibited porous defects, which allowed the effective insertion of iron/sulfur into SC to form the stable Pyr-SC structure. Pyr-SC activated PS, which further sterilized Escherichia coli in the wastewater at a sterilization rate of 7.00 lg E. coli at 10 7 cfu mL −1 in 80 min. The sterilization rate was less affected by temperature and pH. We verified sulfate, hydroxyl and oxygen free radicals produced by the Pyr-SC-activated PS. The Pyr-SC composite, thanks to its expedited electron transfer, could activate PS to engender free radicals. Furthermore, the oscillatory transformation of iron ions caused by the monosulfide ion on the Pyr-SC surface augmented the production of free radicals. An assessment of Pyr-SC's stability was conducted, adhering to the principles of magnetic separation. After five cycles in the Pyr-SC/PS reaction system, the sterilization rate reached 3.29 lg, whereas the leaching rate of iron in Pyr-SC decreased. The Pyr-SC/PS reaction system also had a broad spectrum of wastewater. CONCLUSION The economically prepared Pyr-SC composite provided an effective technology for activating PS and sterilizing microorganisms in wastewater. © 2023 Society of Chemical Industry.
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Environmental Science-Nano
·
2023
·Vol. 10
·期 7
·1897-1906
·
IF 7.3
Yang Yang,Junmin Peng,Huilin Tao,Zhou Yang,Yidong Hou,Wei Lin,Jinshui Zhang
The development of efficient catalysts is of great significance in the photocatalytic ozonation process for organic wastewater treatment. However, the effect of exposed facets and surface defects of the catalyst on the photocatalytic ozonation performance is less covered. Herein, ZnO nanocomposites with different preferentially exposed crystal facets (ZnO-rod and ZnO-disk) were synthesized and used for photocatalytic ozonation of phenol. The characterization and density functional theory calculation results demonstrated that the exposed {0001} facets and oxygen vacancies promoted the separation and transfer of photogenerated charges as well as improved the adsorption and activation of ozone molecules on the catalyst surface. Consequently, the TOC removal rate in the UV-O3/ZnO-disk process (62.4%) was much higher than those in the UV-O3/ZnO-rod process (41.3%) and the UV-O3 process (15%). Moreover, the experimental results of the identification and quenching of active species illustrated that ˙OH was more likely to be produced in the UV-O3/ZnO-disk process, while 1O2 was more likely to be formed over ZnO-rod. A large amount of ˙OH with a stronger oxidation capability than 1O2 contributed to the superiority of ZnO-disk over ZnO-rod in organic pollutant removal. This work demonstrates that the engineering of crystal facets and surface defects provides an effective strategy for constructing efficient catalysts for the photocatalytic ozonation process.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qian Li,Jiahui Zhang,Jiayu Zhou,Wang Xu,Zhuowei Cheng,Piet N.L. Lens,Jianmeng Chen,Dongzhi Chen
The effective and economic treatment of chlorobenzenes has become one of the most intractable issues in the field of air pollution control. Herein, a visible-light photocatalysis coupled with biodegradation (VPCB) system was developed by integrating an innovative visible-light responsive TiO 2 /oxygenous groups decorated g-C 3 N 4 (TiO 2 /OCN) with polyurethane carriers immobilized with Ralstonia sp. XZW-1 for chlorobenzene removal. Performance tests showed that light intensity, preparation of the MICs, catalyst dosage and composition of the TiO 2 /OCN cast significant influence on chlorobenzene removal efficiency, with the degradation efficiency, mineralization and dechlorination ratios of VPCB achieving 100%, 35.5%, and 99.4% under the optimal conditions, respectively, outcompeting the sum of visible-light photocatalytic system and biodegradation protocols. Cycling tests further demonstrated the excellent stability of VPCB. Mechanism analysis found that increased reactive sites, improved visible-light harvesting, accelerated charge transfer and separation, and the resulting abundant active species jointly contributed to the enhanced photocatalytic activity of TiO 2 /OCN. Photogenerated holes were most significant active species for chlorobenzene removal, followed by OH and O 2 − radicals. The carriers could effectively protect microorganisms from light illumination and strong oxidizing species, allowing the further microbial metabolism of chlorobenzene photocatalytic oxidation intermediates with good biodegradability, not only greatly promoting the microbial growth and activity, but further enhancing chlorobenzene photocatalytic degradation. Plausible synergistic mechanism for chlorobenzene degradation between photocatalysis and biodegradation was also revealed. Furthermore, the VPCB system constructed presented wide applicability towards various pollutants, and its performance was found closely related with the hydrophobicity of pollutants. This work provided insight into the design and application of the VPCB system for the efficient and economic treatment of refractory pollutants.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Wang Zhenkang,Ji Haoqing,Zhou Jinqiu,Zheng Yiwei,Liu Jie,Qian Tao,Yan Chenglin
Biphasic self-stratified batteries (BSBs) provide a new direction in battery philosophy for large-scale energy storage, which successfully reduces the cost and simplifies the architecture of redox flow batteries. However, current aqueous BSBs have intrinsic limits on the selection range of electrode materials and energy density due to the narrow electrochemical window of water. Thus, herein, we develop nonaqueous BSBs based on Li-S chemistry, which deliver an almost quadruple increase in energy density of 88.5 Wh L −1 as compared with the existing aqueous BSBs systems. In situ spectral characterization and molecular dynamics simulations jointly elucidate that while ensuring the mass transfer of Li + , the positive redox species are strictly confined to the bottom-phase electrolyte. This proof-of-concept of Li-S BSBs pushes the energy densities of BSBs and provides an idea to realize massive-scale energy storage with large capacitance.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Boyuan Chen,Hui Zhang,Lijuan Li,Yingcheng Hu
Nano-cellulose aerogels have low densities, high porosities, and strong absorption capacities, making them suitable for cleaning up oil and chemical spills in oceans. However, their weak lipophilicity and poor mechanical properties often limit their applications. We attempted to introduce long-chain polymers on the nanocellulose/polyvinyl alcohol (CNF/PVA) surface for the hydrophobic modification of aerogels. In this paper, PVA/CNF was silylated by introducing hydrolyzed ethyltrimethoxysilane to increase its hydrophobicity. Aerogels with interpenetrating pore structures were prepared by a directional freezing method. The aerogels had a high strength in the freezing direction and high compressive elasticity in the direction perpendicular to the freezing direction. Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and water contact angle (148°) tests demonstrated the successful silylation of the aerogel surface. The aerogel absorbed oil and some organic solvents 50–110 times higher than its own weight. It showed good reusability, with an absorption loss rate of 20% after 40 squeezing cycles. This green and sustainable method is inexpensive and has a short production cycle. In addition, the absorption of alcohols and lipids by aerogels can be used as a carrier for surgical drugs.
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