CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Ningdi Xu,Baolong Wang,Ziqiang An,Yingying Liu,Li Liu,Zhen Hu,Yudong Huang
With the growing awareness of energy consumption and environmental pollution, the development of γ-radiation-degradable technology derived from clean energy is of great concern. However, radiation-induced degradation for thermoset materials is limited because γ-radiation-induced radicals are prone to recombination rather than controlled cleavage. Herein, via introducing the radiation-sensitive groups, phenyl imine conjugated N N bonds, we synthesized a radiation-sensitive epoxy monomer from vanillin (a renewable source) and 4-hydroxybenzhydrazide. The thermoset was formed by crosslinking this bio-based epoxy monomer with our reported hardener bearing phenyl imine conjugated N N bonds. When treated by a stimulus of γ-ray radiation, the resulting epoxy thermoset with high contents of sensitive groups could be efficiently degraded at a dose of 10 kGy. Degradation of the thermosets are realized through the controlled cleavage of phenyl imine conjugated N N bonds. Benefiting from this stable conjugated structural design, the epoxy thermosets exhibit excellent mechanical performance and intrinsic flame resistance with a tensile strength over 70 MPa and a limited oxygen index (LOI) of 35.1 %, which are higher than those of traditional robust thermosets made from bisphenol A. This work not only renders a pioneering paradigm of bio-based γ-ray-degradable thermosets but also develops an effective approach to simplify the manufacturing process of fire-safe thermosets, which significantly enhance the versatility of polymer materials.
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CATALYSIS TODAY
·
2022
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IF 6.562
Peng Bai,Tao Zhou,Xiaohua Wang,Xiaofei Liu,Yi Wang,Yue Wang,Edgar Muhumuza,Yonghui Zhang,Pingping Wu
A series of γ-Al 2 O 3 supported gold-palladium (Au-Pd) alloy nanoparticles (NPs) catalysts were synthesized by a one-pot approach applying mercapto-propyl-trimethoxysilane (MPTMS) as an anchoring ligand. Homogeneously dispersed Au-Pd alloy NPs were observed on the prepared catalysts and their catalytic performance in benzyl alcohol partial oxidation was investigated. Results showed that the highest benzaldehyde yield was achieved on catalyst Au-Pd/7%MPTMS-γ-Al 2 O 3 with a benzaldehyde selectivity of 90%. By establishing the structure-performance relationship, the high activity of catalysts with MPTMS modification was attributed to the anchoring and dispersion effect of MPTMS on Au-Pd NPs, while the high benzaldehyde selectivity was due to the formation of more surface Lewis acid sites after introducing MPTMS, protecting the benzaldehyde from over-oxidation to byproducts.
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Journal of the American Chemical Society
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2022
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IF 16.383
Qian Zhang,Yong-Hui Song,Jing-Ming Hao,Yi-Feng Lan,Li-Zhe Feng,Xue-Chen Ru,Jing-Jing Wang,Kuang-Hui Song,Jun-Nan Yang,Tian Chen,Hong-Bin Yao
All-inorganic CsPbI3 perovskite is attractive for deep-red light-emitting diodes (LEDs) because of its excellent carrier mobility, high color purity, and solution processability. However, the high phase transition energy barrier of optically active CsPbI3 black phase hinders the fabrication of efficient and bright LEDs. Here, we report a novel α-BaF2 nanoparticle substrate-promoted solution-processable heteroepitaxial growth to overcome this hindrance and obtain high-quality optically active γ-CsPbI3 thin films, achieving efficient and bright deep-red LEDs. We unravel that the highly exposed planes on the α-BaF2 nanoparticle-based heteroepitaxial growth substrate have a 99.5% lattice matching degree with the (110) planes of γ-CsPbI3. This ultrahigh lattice matching degree initiates solution-processed interfacial strain-free epitaxial growth of low-defect and highly oriented γ-CsPbI3 thin films on the substrate. The obtained γ-CsPbI3 thin films are uniform, smooth, and highly luminescent, based on which we fabricate efficient and bright deep-red LEDs with a high peak external quantum efficiency of 14.1% and a record luminance of 1325 cd m–2.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2022
·Vol. 102
·期 13
·5925-5934
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IF 4.125
Hedi Wen,Deju Zhang,Jingbo Liu,Xiaomin Shang,Xuanting Liu,Zhiyang Du,Ting Zhang
BACKGROUND In this study, a safe and relatively stable γ -cyclodextrin-lysozyme ( γ -CD-Lys) was synthesized using epichlorohydrin as the cross-linking agent, and curcumin was successfully encapsulated in γ -CD-Lys. RESULTS The successful Lys grafting onto γ -CD can be demonstrated by a high grafting ratio (79.02%) and was further confirmed by Fourier transform infrared (FTIR) band shifts and the new signal obtained at δ 2.75 in proton nuclear magnetic resonance. The encapsulation efficiency value of γ -CD-Lys was 76.74%, and the successful encapsulation of curcumin into γ -CD-Lys was confirmed by crystal structure change, increased melting point, and FTIR band shifts. The intermolecular bonds results suggested that associative forces between curcumin and γ -CD-Lys were electrostatic interaction, hydrogen bonds interaction, and hydrophobic interaction. The designed nanoparticles had excellent stability at low pH and low salt concentration. The release rate of these nanoparticles was inhibited in simulated gastric conditions, whereas it increased significantly in intestinal media. Simulated gastrointestinal digestion experiments further confirmed that nanoparticles showed higher bioaccessibility (86.05%) compared with curcumin (58.82%). CONCLUSION Overall, our study showed that the nanoparticles were highly promising for delivering curcumin because of their enhanced functional attributes and stabilization in acid or low salt environments. Also, it was an excellent wall material for targeting hydrophobic bioactive compounds in the intestinal tract via oral administration. © 2022 Society of Chemical Industry.
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Materials Today Chemistry
·
2022
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IF 7.613
Yuan Wang,Xuemei Liu,Quyun Chen,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Addressing arsenite pollution in groundwater has drawn great attention. It is attractive to pre-oxidize highly mobile As(III) to relatively low-toxic As(V) with a subsequent adsorption separation process. Herein, BiOI anchoring on γ-Fe 2 O 3 is performed to synthesize BiOI/γ-Fe 2 O 3 core–shell nanoparticles for efficient removal of As(III) via a simultaneous photocatalytic oxidization–adsorption process. The physical and chemical structures of BiOI/γ-Fe 2 O 3 are investigated by transmission electron microscopy , Fourier transform infrared spectroscopy , and X-ray diffraction measurements. The photoluminescence and electron spin resonance (ESR) characterization were employed to ascertain the possible reaction mechanism of visible-light-driven photocatalytic oxidation of As(III). Such BiOI/γ-Fe 2 O 3 delivers a superior As(III) removal capability under visible light irradiation with an arsenic removal efficiency of 99.8% within 180 min, higher than those of BiOCl/γ-Fe 2 O 3 (81.7%) and BiOBr/γ-Fe 2 O 3 (98.9%). The optimal BiOI/γ-Fe 2 O 3 (molar ratio of 2:1) is obtained by rationally adjusting the molar ratio of BiOI to γ-Fe 2 O 3 . The as-synthesized BiOI/γ-Fe 2 O 3 performs well in a wide pH range of 2–8. Only coexisting PO 4 3− anions have a significant effect on the As(III) removal. The free radical trapping experiment and ESR results demonstrate that the ⋅O 2 − and h + are the main active substances for the photocatalytic oxidation of As(III) on BiOI/γ-Fe 2 O 3 . This work not only gives a novel magnetic core–shell nanoparticle photocatalyst for efficient photocatalytic oxidation and adsorption of As(III) but also offers a new strategy to rationally design BiOX for its related practical applications.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Peiguo Zhou,Xin Ru,Wenjing Yang,Zongbiao Dai,Meshack Appiah Ofori,Jianqiang Chen,Jiaxin Hou,Zhijun Zhong,Hui Jin
Carboxymethyl cellulose (CMC) and wood flour cellulose (WFC) graft copolymers were prepared from acrylamide/dimethyl diallyl ammonium chloride (AM/DMDAAC) by γ-ray co-irradiation graft copolymerization method. CMC could obtain an excellent grafting effect at the absorbed dose of 6 kGy and CMC/AM/DMDAAC ratio of 0.2 g:2 g:1 ml, and the grafting rate, grafting efficiency, cationic degree and grafting efficiency of DMDAAC monomer were 790%, 46.01%, 20.17% and 64.56% respectively. Relatively, when the ratio of AM and DMDAAC was 3 g:1 ml and the absorbed dose was 8 kGy, the grafting effect of WFC was the optimum, and the more WFC added, the better graft copolymerization effect. The flocculation effect of the products and cationic polyacrylamide on kaolin wastewater was investigated, and the maximum turbidity removal rate of CMC graft copolymer on kaolin wastewater reached 86.0%, showing an excellent flocculation effect. The flocculation effect under different conditions was WFC graft copolymer＞CMC graft copolymer＞Cationic Polyacrylamide.
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APPLIED CATALYSIS A-GENERAL
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2021
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IF 5.706
Feng Wang,Lu Yu,Chao Li,Xiaofeng Xia,Fuming Zhang,Robert J. Linhardt
In this paper, a reusable heterogeneous catalyst of papain was prepared and used to catalyze the polymerization for oligo-glutamate. In silico, the 9,9-bis(2,3-epoxypropyl) fluorenyl group (DDI) carried on polystyrene beads (PS-PEG-DDI) showed site-specific binding for sites which are far away the active site of papain. The immobilization of papain on PS-PEG-DDI reached the optimal value of 126 ± 2.5 mg/g beads and 1726.2 ± 34 U/g beads at the papain/beads ratio of 1:5 in phosphate buffer (pH 8.0, 200 mM) at 45 °C for 4 h. The storage stability, pH stability, thermal stability, solvent tolerance and resistance to metal ions of papain were enhanced by the immobilization. The oligomerization of L -glutamic acid diethyl ester hydrochloride via PS-PEG-DDI immobilized papain in phosphate buffer (pH 8, 200 mM) at 45 °C demonstrated the yield of oligo(γ-ethyl-L-glutamate) reached 78.6 ± 1.2% under the conditions of 2 U/ml of papain, 60 mg/ml L -glutamic acid diethyl ester hydrochloride for 4 h. The immobilization increased the yield by about 40%. The analysis by mass spectrometry (MS) and 1 H NMR showed an average degree of polymerization (DP avg ) of product was approximately 7–8, identical to that produced using free papain. The biocatalytic activity of the PS-PEG-DDI immobilized papain remained stable after 5 repeated uses, all giving a yield of over 70%. The reduced activation energy of the reaction catalyzed by the PS-PEG-DDI immobilized papain suggests a more favorable active conformation was probably achieved following immobilization.
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Foods
·
2021
·Vol. 11
·期 1
·60
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IF 4.35
Jianan Liu,Hongyan Wu,Xinying Ao,Hongshun Hao,Jingran Bi,Hongman Hou,Gongliang Zhang
The aim of this study was to develop inclusions formed by γ-cyclodextrin (γ-CD) and three isothiocyanates (ITCs), including benzyl isothiocyanate (BITC), phenethyl isothiocyanate (PEITC), and 3-methylthiopropyl isothiocyanate (MTPITC) to improve their controlled release for the inhibition ofStaphylococcus aureus(S. aureus). These inclusion complexes were characterized using X-ray diffraction, Fourier-transform infrared, thermogravimetry, and scanning electron microscopy (SEM), providing appropriate evidence to confirm the formation of inclusion complexes. Preliminary evaluation of the antimicrobial activity of the different inclusion complexes, carried out in vitro by agar diffusion, showed that such activity lasted 5–7 days longer in γ-CD-BITC, in comparison with γ-CD-PEITC and γ-CD-MTPITC. The biofilm formation was less inS. aureustreated with γ-CD-BITC than that of BITC by using crystal violet quantification assay and SEM. The expression of virulence genes, includingsarA,agr,cp5D,cp8F,clf,nuc, andspa, showed sustained downregulation inS. aureustreated with γ-CD-BITC for 24 h by quantitative real-time polymerase chain reaction (qRT-PCR). Moreover, the growth ofS. aureusin cooked chicken breast treated with γ-CD-BITC and BITC was predicted by the Gompertz model. The lag time of γ-CD-BITC was 1.3–2.4 times longer than that of BITC, and correlation coefficient (R2) of the secondary models was 0.94–0.99, respectively. These results suggest that BITC has a more durable antibacterial effect againstS. aureusafter encapsulation by γ-CD.Keywords:cyclodextrin;inclusion;isothiocyanates;Staphylococcus aureus;controlled release;antibacterial activities
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Journal of Materials Chemistry C
·
2023
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IF 6.4
Tianqi Zhao,Renagul Abdurahman,Qianting Yang,Ruxiangul Aiwaili,Xue-Bo Yin
Herein, we designed and prepared the persistent luminescence nanoparticles (PLNPs) of γ-Ga2O3:Cr,Ba rationally with Cr ions to achieve the near-infrared (NIR) emission at 700 nm and Ba ions to improve the emission intensity by inducing trap distribution. Energy transfer between γ-Ga2O3 and Cr ions occurs as the emission at 508 nm decreases and that at 700 nm increases along with the increased content of Cr ions. In combination with the trap depth, band gap of the host, and energy levels of Cr ions, an emission mechanism was proposed. Thus, NIR emission (700 nm), high brightness, large Stokes shift (446 nm), and long afterglow time (90 min) were achieved with the optimal γ-Ga2O3:0.0025Cr,0.0012Ba (γGCB) under excitation at 254 nm. The emission intensity of γGCB is temperature-dependent for non-contact ratiometric temperature sensing, and temperature linearity ranging from 300 to 420 K was achieved with an absolute sensitivity of 3.4% K−1. γGCB and γ-G2O3 are white under sunlight but exhibit red and green emissions under single excitation at 254 nm. Thus, Morse and binary codes are adapted to achieve encryption information transfer with the combination of γGCB and γ-G2O3. This work provides ideas for selecting a host, emission center, and trap for PLNPs with desirable properties and thus achieves extensive applications, as validated with ratiometric temperature sensing and encryption information transfer.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Shutong Hao,Xiaolin Liu,Qianli Li,Mu Gu,Shuai Cheng,Jingtai Zhao
The demand for scintillators with ultrafast decay times, high spatial resolutions, and high stabilities is increasing due to the development of ultrafast hard X-ray detection, hard X-ray imaging, and high-energy physics facilities. γ-CuI single crystals, which exhibit ultrafast luminescence and high stopping power for hard X-rays, hold great promise for such applications. However, slow luminescence and poor stability caused by surface iodine deficiencies hinder the practical use of γ-CuI. Herein, we treated a γ-CuI single crystal by iodine annealing and SiO2 coating and investigated its crystal structure and luminescence properties in detail. Iodine annealing significantly enhanced the near-band-edge emission of the γ-CuI crystal with an ultrafast decay time of less than 1 ns, while completely suppressing the slow luminescence. Moreover, the SiO2 film effectively prevented the oxidation and decomposition of surface iodine, leading to substantial improvement in luminescence stability. The γ-CuI crystal demonstrated an ultrahigh spatial resolution of 1.5 μm in X-ray imaging, highlighting its potential for ultrafast hard X-ray imaging applications. This study provides insight into the growth, optimization, and application of γ-CuI crystals, advancing the field of scintillator materials.
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COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 6
·979-986
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IF 1.931
Zhang Rongli,Hu Yulong,Yuan Xingpan,Zhang Shaoqi,Zhang Cuige,Liu Huan,Huo Chaofei,Wang Hao
An electroconductive nanoparticles (NPs) film consisting of sodium poly(γ-glutamate) (γ-PGANa) and 3,4-diaminothiophene dihydrochloride (DATh) was simply prepared through macromolecular self-assembly and electropolymerization methods. Firstly, the γ-PGANa and the DATh underwent a complexation to form DATh/γ-PGANa composites through the electrostatic interaction; the DATh/γ-PGANa composites were then self-assembled into DATh/γ-PGANa NPs through decreasing the pH value in aqueous solution. Next, an electroconductive NPs film was formed on the surface of a gold electrode by casting the DATh/γ-PGANa NPs and subsequently electropolymerizing the DATh. Last, horseradish peroxidase and Nafion were cast onto the NPs film to obtain an enzymatic biosensor for H 2 O 2 detection. The electroconductive DATh/γ-PGANa NPs film endowed the biosensor with high sensitivity. Under the optimal conditions, the prepared biosensor showed a linear range from 1 × 10 −11 to 1 × 10 −4 mol·L −1 with a detection limit of 3 × 10 −12 mol·L −1 for H 2 O 2 detection. The biosensor can retain its detection performance for 4 weeks. The response currents of the biosensor changed little after adding the interferent into the analyte. The standard deviation of the response between different biosensors did not exceed 2.5%. Graphical abstract
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Analytical Methods
·
2021
·Vol. 13
·期 15
·1832-1838
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IF 2.896
Jiaxi Cheng,Fenghua Jiang,Siqi Zhang
Herein, an ultrasensitive and selective nanofluidic device for tetracycline (TC) was developed in association with γ-cyclodextrin and graphene oxide (GO). The assay was designed based on the change of the nanochannel surface charge due to the selective recognition ability of GO between aptamers and TC–aptamer complexes. And γ-cyclodextrin was utilized to eliminate the excess TC since the amine group molecules were inclined to be adsorbed onto the nanochannel surface and affected the adsorption efficiency of the nanochannel. In the presence of TC, TC specifically binded to the aptamer to form TC–aptamer and was separated from GO. The TC–aptamer complexes could be quantitated with conical nanochannels coated with polyethyleneimine (PEI)/Zr4+. The redundant TC was removed by γ-cyclodextrin. The detection limit of the nanofluidic device was as low as 2 ng L−1 (S/N = 3) and the linear range was 10 ng L−1 to 10 μg L−1. Moreover, the nanofluidic device provided high specificity and good recovery rates of 94.8–109.3% in natural river, tapwater and wastewater samples. The results revealed that our study provided a new rapid detection method for trace contaminant analysis.
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