JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Wan-ping Chen,Run-quan Wang,Yue-rong Zhang,Kai Song,Yuan Tian,Jia-xian Li,Guo-ying Wang,Gao-feng Shi
In this article, the scavenging ability of hypericin on hydroxyl radicals was evaluated by UV spectra, HPLC and fluorescence spectra. The reaction mechanism of the scavenging of free radicals by hypericin was also investigated. The Gaussian calculations obtained for the spatial structure and electrostatic potential of hypericin revealed that the active site for the reaction of hypericin with hydroxyl radicals is on the phenolic hydroxyl group of hypericin. The dissociation energy, spin density and frontline orbitals of the dehydrogenated hypericin radicals yielded that hypericin 7-OH and 7′ -OH are most likely to react with hydroxyl radicals. the transition state structure, enthalpy change and Gibbs free energy change and energy change of the reaction between hypericin and hydroxyl radicals,and the results of the above calculations indicate that hypericin 7-OH and 7′ -OH have the highest activity, can be directly involved in the scavenging process of radicals, followed by 5-OH and 5′ -OH, and finally 4-OH (4′ - OH).In-depth study of the antioxidant mechanism of hypericin molecules can help to design and synthesize new antioxidants in a more rational way.
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CHEMOSPHERE
·
2023
·
IF 8.8
Xinke Zhang,Junjie Guo,Yao Huang,Gang Lu
This study aimed to achieve toxicity control of sulfadiazine (SDZ) and pirimiphos-methyl (PMM) via the UV/H 2 O 2 process by optimizing the reaction parameters. The results show that both drugs had a good degradation effect under the following parameters: a H 2 O 2 molar ratio of 1:200, and neutral conditions. SDZ and PMM could be degraded by more than 99% within 3 min, respectively. In the Daphnia magna acute toxicity assay and Vibrio fischeri inhibition assay, both SDZ and PMM exhibited a phenomenon of increasing toxicity. Additionally, through the use of density functional theory (DFT) calculation and HPLC-QTOF-MS, 21 transformation products (TPs) were identified, and the principal degradation pathways were proposed. The toxicity of the TPs was determined by comparing the QSAR prediction results with toxicity test data. As a result, under the higher UV light intensity (2300 μW/cm 2 ) and neutral conditions, SDZ showed highest toxicity, whereas PMM showed lowest toxicity under the lowest UV light intensity (450 μW/cm 2 ) and neutral conditions. Four main toxic TPs were identified, and their yields could be reduced by adjusting the reaction parameters. Therefore, the selection of appropriate reaction parameters could reduce the production of toxic TPs and ensure the safety of water environment.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2026
·
IF 15
Wan Menghui,Gao Minjie,Luo Wen,Jin Lin,Zhao Yanbao,Sun Lei
Conventional pesticides generally suffer from low actual utilization efficiency due to their large particle sizes, weak leaf adhesion and rain erosion. Developing functional nanomaterials with high foliar affinity and rain-fastness remains a major challenge for enhancing pesticide utilization efficiency. Herein, we developed novel jellyfish-like nanocarriers for pesticide delivery. Firstly, jellyfish-like mesoporous polydopamine (J-mPDA) were prepared via an interface anisotropic self-assembly strategy. The unique jellyfish-like structure may enlarge the contact area and the topological interaction between the leaf surface and the nanocarrier. The synthesized J-mPDA carriers presented radial mesopores with a cross-sectional size of about 290 nm and an imidacloprid (IMI) loading efficiency of 22.4%. After loading IMI, tannic acid-copper ions (TA/Cu) networks were utilized to cap the loaded-pesticide pores (IMI@J-mPDA@TA/Cu). The obtained IMI@J-mPDA@TA/Cu exhibited pH/near-infrared dual responsiveness release properties. The IMI@J-mPDA@TA/Cu significantly improved the adhesion and retention efficiency of the foliar surface. Furthermore, the obtained nanoparticles displayed good biosafety and no significant inhibitory effect on bacteria and seed germination. In addition, IMI@J-mPDA@TA/Cu possessed an improved 6-fold anti-UV photostability compared with IMI, and high control efficacy against Plutella xylostella . As a result, this work provides a novel option to address adhesion inefficiencies and reduce pesticide runoff, making it a promising for efficient pesticide delivery. Graphical
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Qiaoyan Wang,Muxin Chen,Yulin Min,Penghui Shi
The occurrence and transformation of microplastics (MPs) in environment has attracted considerable attention. However, the release characteristics of MP-derived dissolved organic matter (MP-DOM) under oxidation conditions and the effect of DOM on subsequent chlorination disinfection by-product (DBP) still lacks relevant information. This study focused on the conversion of polystyrene microplastics (PSMPs) in the advanced oxidation of ultraviolet-activated sodium percarbonate (UV/SPC-AOP) and the release characteristics of MP-DOM. The DBP formation potential of MP-DOM was also investigated. As a result, UV/SPC significantly enhanced the aging and fragmentation of PSMPs. Under UV irradiation, the fluorescence peak intensity and position of humus-like and protein-like components of MP-DOM were correlated with SPC concentration. The aging MP suspension was analyzed by gas chromatography–mass spectrometry (GC-MS), and various alkyl-cleavage and oxidation products were identified. Quenching experiments and electron paramagnetic resonance (EPR) detection confirmed that carbonate and hydroxyl radicals jointly dominated the conversion of PSMPs. The formation of DBP was related to the components of MP-DOM. Overall, these results help to understand the aging behavior of MPs in AOP . Moreover, MP-DOM released by MPs after AOP oxidation may be a precursor of DBPs, which deserved more attention.
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FOOD SCIENCE AND BIOTECHNOLOGY
·
2023
·
IF 2.9
Lee Jung-Soo,Ahn Jiwon,Han Jaejoon
Various edible polymers [sodium alginate, carboxyl methylcellulose, sodium oleate, liquid paraffin, pectin, pullulan, polyvinyl acetate, and shellac (SHE)] as potato-coating materials and their effect on extending the shelf life of potatoes when combined with an edible coating and UV-C irradiation treatments were evaluated. As a result of the characterization of the edible polymers, SHE was selected as the optimal coating material because it had the best moisture and light barrier properties. SHE coating successfully prevented the greening, respiration, and sprouting of potatoes caused by exposure to light and oxygen. Additionally, it reduced weight loss by inhibiting transpiration on the potato surface. While the SHE coating did not exhibit antimicrobial effects, a significant effect was observed when combined with UV-C irradiation. This study suggests the potential of combined treatment of SHE coating and UV-C irradiation in extending the postharvest quality of potatoes.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Jiahao He,Zhijiang Liu,Wenlu Zhang,Chong He,Wenbin Li
Vectran fabrics are widely employed as the key material for the manufacturing of stratospheric airship. Nonetheless, Vectran faber would decompose due to the UV aging during the prolonged flying process. Herein, atomic layer deposition (ALD) technology was introduced to coat TiO 2 nanolayers on the surface of Vectran fabrics. Titanium isopropoxide liquid was employed as the Ti source precursor throughout the deposition process. Compared with sol-gel vacuum infiltration technic, ALD modified Vectran yarns possessed higher surface uniformity, better UV blocking performance and lower density. Notably, thickness of the TiO 2 nanocoating prepared through the ALD method was adjustable, which can optimize the UV resistance of Vectran yarn without significantly affect its density. Additionally, the nanolayer interface can induce structural coloration on the Vectran strand via diffraction phenomena. These outstanding merits endow ALD technic a promising choice to modify the surface of Vectran fiber used as the skin of stratospheric airships.
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POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Yuhao Zhao,Yuxuan Li,Yuze Dai,Ying Zhang,Min Jiang,Guangyuan Zhou
As a candidate of fossil-based poly(ethylene terephthalate) (PET), bio-based poly(ethylene 2,5-furandicarboxylate) (PEF) that could be converted from renewable resources has attracted attention from academia and industry. Here, we prepare a series of new type of PEF/TiO 2 NWs composites from 2,5-furandicarboxylic acid (FDCA), ethylene glycol (EG), titanium dioxide nanowire (TiO 2 NWs, diameter∼100 nm, length∼20 µm) and dipentaerythritol (Di-PE) via in-situ polymerization. The TiO 2 nanowires (0.5∼10 wt‰ based on PEF) and Di-PE (3 mol‰ based on FDCA) were added as fillers and extenders. TiO 2 nanowires were distributed in the PEF uniformly, shown by SEM. Compared with pure PEF, the T g and thermal stability of all nanocomposites got improved. And the impact strength of nanocomposites could reach 60 kJ/m 2 in contrast to brittle pure PEF. The UV-A and blue-light shielding of nanocomposites increased from 53 % to 98 % and 28 % to 86 %, respectively, and the nanocomposites still maintained good gas barrier properties. Moreover, the antibacterial activity of nanocomposites against E. coli had increased to 98 %, better than that of the PEF/Ag NWs composites. By uniaxial pre-stretching, the tensile modulus and the elongation at break were improved obviously, from 1840 MPa to 5466 MPa and 4 % to 54 % respectively with pre-stretching ratio increasing. Compared to the PET/TiO 2 NWs composites, the PEF/TiO 2 NWs composites shows batter thermal property and mechanical property. The PEF/TiO 2 NWs composites exhibit potential foreground in the packaging application.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Zezheng Lin,Yang Guo,Xiaoxuan Qu,Yuying Xiang,Shuwen Shen,Xin Zhu
Widely diffused pollution of endocrine disrupting chemicals (EDCs) has indeed threatened the safety of ecological environment and human health. A hydrangea-like Fe doped BiOBr (Fe-BiOBr) microsphere was synthesized and used to enhance the performance of UV/persulfate (PS) system using bisphenol A (BPA) as the targeted contaminant. The photochemical characterization of Fe-BiOBr showed that Fe doping markedly improved the separation efficiency of photoelectron and hole, and enhanced the utility rate of luminous energy of BiOBr. Degradation test demonstrated that with the assistance of Fe-BiOBr, the efficiency of UV/PS system was increased by 1.8 times, while 85.7% of BPA can be degraded within 10 min. Through scavenging experiments, sulfate radical (SO 4 •− ), superoxide radical (O 2 •− ), and hole were demonstrated as the dominate reactive species (RSs) in UV/Fe-BiOBr/PS system. Then, the role and mutual transformation of RSs was further clarified by radicals steady-state concentrations estimation and X-ray photoelectron spectroscopy (XPS) analysis. Based on the results, the produced O 2 •− can be subdivided into confined O 2 •− and free O 2 •− from the UV induced oxygen vacancy and photoelectron, respectively. Of which, SO 4 •− and confined O 2 •− were symbiotic via the redox cycle of Fe species. Significantly, only 2.6% of TOC can be simultaneously removed within 10 min treatment time, suggesting the incomplete degradation of BPA. For this, 16 organics was detected using LC-MS and the degradation route of BPA was also determined based on the intermediates analysis. Finally, the application possibility of the system was evaluated from the perspective of ecotoxicity by ECOSAR and T.E.S.T. softwares. This study investigates the dual effect of transition metal doped semiconductor on coupling system, and provides new insights into the role of O 2 •− .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qi Wang,Zhaozhe Yang,Xinhao Feng,Xinyou Liu
Cellulose nanocrystals (CNCs) are green reinforcing materials, and their potential has been evaluated in the preparation of waterborne UV-curable resin composites with high-performance. Herein, we present a novel and scalable approach for preparing surface-modified CNCs with acrylic-based polymers to strengthen the compatibility and interaction between CNCs and UV-curable resins. Using tert-butyl acrylate as the monomer, the nanocellulose grafted copolymer CNC-g-PtBA was successfully synthesized via atom transfer radical polymerization (ATRP) in the presence of a macromolecular initiator. Then, the CNC-g-PtBA is blended into the acrylic resin as a nanofiller to prepare the UV-curable nanocomposite. The results indicated that the contact angle of the CNCs increased from 38.7° to approximately 74.8°, and their thermal stability was significantly improved after graft modification. This contributed to the effective alleviation of the agglomeration phenomenon of nanocomposites due to the high hydrophilicity of pure CNCs. Notably, not only was the UV curing efficiency of the nanocomposites greatly increased but the mechanical properties were also further enhanced. Specifically, with the addition of 0.5 wt% CNC-g-PtBA, the curing time of the nanocomposite was shortened from >30 mins down to approximately 6 mins, and the bending strength was increased from 10 MPa for the original resin and 5 MPa for the addition of pure CNCs to 14.3 MPa, and the bending modulus was also greatly increased (up to approximately 730 MPa). Compared to pure CNCs, they are compatible with the resin, exhibiting high mechanical strength and flexibility, and have virtually no effect on the light transmission of the nanocomposites. Additionally, dielectric analysis (DEA) was used to monitor the dielectric constant and conductivity of the UV-curable nanocomposites in real time to further characterize their curing kinetics. The permittivity of these nanocomposites increased by 125 % compared to pristine resin, which shows potential for applications in high dielectric composites or for improving electrical conductivity . This work provides a feasible method for preparing UV-curable nanocomposites with high curing efficiency and permittivity, realizing a wider application of this high-performance nanocomposite.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 30
·50731
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IF 3.125
Mengqing Jiang,Yihua Yin,Weiquan Cai,Jingli Zhang,Lihong Fan,Ying Yi,Yue Dai,Ting Zhou,Jinsheng Liu
To improve photostability and enhance utilization rate and reduce pest resistance, a new strategy based on the combination of photodynamic insecticide action and stimulus-responsive polymer micelles is developed. 4-(phenylazo)benzoic acid (PBA)-modified poly(ethylene glycol) monomethyl ether (mPEG) conjugate is prepared by the esterification reaction of mPEG and PBA, and followed by self-assembly in aqueous solution to obtain polymeric nanoparticles. TEM shows that the nanoparticles have a core-shell structure and an average diameter of 78 nm. DLS shows that the nanoparticles are stability in water solution but can change their structure in response to UV light and/or esterase stimulation. The photodegradation of Protoporphyrin IX (PpIX) encapsulated in the nanoparticles can be effectively inhibited because of aggregation-caused quenching effect, whose maximum photodegradation rate is about 20.54% after 8 h exposure to daylight compared with the complete photodegradation of free PpIX. UV light and/or esterase stimulus can trigger PpIX release and result in a high photodynamic activity. Compared with free PpIX, the PpIX-loaded nanoparticles show a higher phototoxicity to insect cells and the daylight pretreatment has little influence on the phototoxicity.
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OPTICS EXPRESS
·
2021
·Vol. 29
·期 6
·8997-9011
·
IF 3.894
Yongchao Wang,Yongchao Wang,Yining Zhang,Dongxin Li,Dongxin Li,Aiqin Zhang,Aiqin Zhang,Hua Wang,Hua Wang,Husheng Jia,Husheng Jia,Bingshe Xu,Bingshe Xu
A novel white-light copolymer matched with 365 nm chips is prepared by bonding the vinyl-functionalized complexes Eu(TTA)2(Phen)(MAA), Tb(p-BBA)3(UA) and Zn(BTZ)(UA) to polysiloxaneprepolymer(synthesized by polycondensation of vinyltrimethoxysilane and diphenylsilanediol) through a technical route of polymerization after coordination. Its structure was characterized by infrared and ultraviolet. Under the excitation of 365 nm, when the ratio of the tricolor complexes is controlled to be 0.5: 3: 1.5, white light copolymer with CIE color coordinates of (0.327, 0.321) was obtained and packaged to get white light LED devices. After aging, the CIE color coordinates of the device change from (0.325, 0.329) to (0.341, 0.348), the color rendering index changes from 91 to 88, and the correlated color temperature changes from 5967 K to 5612 K. The loss of brightness is only 10.4%, which shows good resistance to UV aging. Moreover, the initial decomposition temperature of the copolymer is 235°C. The above results show that the bonding-type anti-ultraviolet copolymer phosphor has potential application in near ultraviolet LEDs.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hongkun Liu,Bingbing Zhang,Ling Li,Ying Wang
Deep-UV (DUV) nonlinear optical (NLO) materials are of vital importance to demanding DUV laser applications; however, those with a large NLO coefficient, wide band gap, and sufficient phase-matching ability are rare. In this work, by combining π-conjugated B3O6 groups and distort AlO3F tetrahedra, we successfully designed and synthesized two fluoroaluminoborates, RbAlB3O6F (RABF) and Cs0.5Rb0.5AlB3O6F (CRABF). In addition, the solid solution CsxRb1–xAlB3O6F (0.2 < x < 0.8) polycrystalline samples were obtained by the standard solid-state reaction. It was shown that all these compounds are NLO-active and possess short UV cutoff edges (<200 nm). Interestingly, although they have the same fundamental structural units, their crystal structures and second harmonic generation (SHG) responses are significantly different owing to the cation effect. Theoretical calculations reveal that both B3O6 and AlO3F groups contribute to the SHG responses. Remarkably, it also indicates that RABF exhibits a large birefringence (Δn = 0.0946 at 1064 nm), which is capable of realizing deep-UV phase matching down to 174 nm. The exploration of fluoroaluminoborates provides a new perspective for searching excellent deep-UV NLO materials.
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