Journal of Cleaner Production
·
2022
·
IF 11.072
Shuo Wang,Xiaoling Huang,Luowei Pei,Xinyi Zhu,Songming Zhu,Ying Liu,Zhangying Ye
UV photo-electrocatalytic process has emerged as a promising approach for the abatement of ammonia nitrogen in wastewater. However, the radical chemistry for ammonia nitrogen removal in this process requires further clarification. The heterogeneous reaction pathways and mechanism of ammonia nitrogen oxidation in the UV photo-electrocatalytic process were investigated in this study. Photocurrents of the Ti/RuO 2 -IrO 2 -TiO 2 electrodes with good electrocatalytic behavior were enhanced by UV radiation. Compared with the electrocatalytic process, the removal rates of ammonia nitrogen were improved by 12.4%∼20% at the Cl − concentration of 50 mM in the photo-electrocatalytic process. The ammonia nitrogen was mainly transferred into N 2 , meanwhile, the formation of nitrogenous by-products, active chlorine, and chloramines was inhibited in the photo-electrocatalytic process. The contribution of UV radiation was to photo-decompose the active chlorine and chloramines, generating free radicals. The removal efficiency of ammonia nitrogen reached more than 64% after the elimination of free radicals. The electro-generated HOCl was the principal species for ammonia nitrogen removal, and the synergistic effect for the acceleration of ammonia nitrogen oxidation resulted from the photo-generated chlorine radicals. This investigation provides insight into the electrochemistry , photochemistry , and radical chemistry for the heterogeneous catalytic degradation of ammonia nitrogen by UV photo-electrocatalytic process.
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POLYMER BULLETIN
·
2018
·Vol. 76
·期 3
·1167-1182
·
IF 1.589
Wu Chengyi,Li Cong,Zhang Xu,Cheng Chao,Wang Jinshou
A novel pH-sensitive and macroporous NaAlg-based hydrogels were prepared, the monomers of which were N -methylolacrylamide (NMAAm) and acrylic acid, using N , N -methylene-bis-acrylamide (MBA) as a cross-linker, 2,2-dimethoxy-2-phenylacetophenone as a photoinitiator via ultraviolet irradiation. The morphology, thermal property and structure of hydrogel were characterized by Fourier transform infrared spectroscopy, scanning electron microscope, X-ray diffractometer and thermogravimetric analysis. The swelling ratios (SRs) of hydrogel were investigated in water, salt and pH solutions. The SR of hydrogel in water increased from 8.1 to 19.4 g/g with increase in weight of NaAlg from 0.2 to 1.0. The result indicated that hydrogel displayed favorable pH- and salt-sensitive. 5-fluorouracil (5-FU) as a model drug was loaded on hydrogel, the drug encapsulation efficiency of products reached to 85.2%, and the cumulative release rate of drug was 78.4 and 37% in the intestinal and gastric fluid, respectively. In addition, the dynamic data of drug release were evaluated by different mathematical models, and the experimental results revealed that it was more fitted to Ritger–Peppas and Higuchi equation models, correlation coefficients ( R 2 ) of which were up to 0.99.
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CHEMOSPHERE
·
2017
·
IF 4.208
Aimin Li,Zhe Zhang,Peifeng Li,Lejuan Cai,Lizhi Zhang,Jingming Gong
Effective decomposition of perfluorooctanoic acid (PFOA) has received increasing attention in recent years because of its global occurrence and resistance to most conventional treatment processes. In this study, the complete mineralization of PFOA was achieved by the UV-photolysis of nitrate aqueous solution (UV/Nitrate), where the in-situ generated nitrogen dioxide radicals ( NO 2 ) efficiently mediated the degradation of PFOA. In particular, when the twinborn hydroxyl radicals were scavenged, the production of more NO 2 radicals realized the complete mineralization of PFOA. DFT calculations further confirm the feasibility of PFOA removal with NO 2 . Near-stoichiometric equivalents of fluoride released rather than the related intermediates were detected in solution after decomposition of PEOA, further demonstrating the complete degradation of PFOA. Possible PFOA degradation pathways were proposed on the basis of experimental results. This work offers an efficient strategy for the complete mineralization of perfluorinated chemicals, and also sheds light on the indispensable roles of nitrogen dioxide radicals for environmental pollutants removal .
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AICHE JOURNAL
·
2019
·Vol. 66
·期 2
·e16841
·
IF 3.463
Chong Shen,Minjing Shang,Hong Zhang,Yuanhai Su
In this work, we report a simple and inexpensive UV-LEDs based photomicroreactor assembly constructed by commercially available components. The photoisomerization of norbornadiene to quadricyclane was selected to validate this novel photomicroreactor design. Mass transport limitation was eliminated and indicated by dimensionless numbers Fo and Da II , and photons loss was evaluated considering the absorption and reflection of the microreactor walls. The solvents, photosensitizers, and light sources selections were optimized for achieving better photochemical performance and mechanistic insights. The detailed comparison between the high-pressure mercury arc lamp and the UV-LEDs strip revealed great potential of UV-LEDs as appealing light source for photochemical transformations. Moreover, the reaction mechanism was thoroughly discussed and illustrated by the Jablonski diagram indicating electronic states transitions. According to possible intermediate steps, a kinetic model was proposed with the reaction rate constant being correlated with the photon flux, which is valuable for process optimization and further understanding reaction mechanisms.
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Frontiers in Nutrition
·
2025
·
IF 5.1
Xiaojie Zhang,Lan Yang,Haifei Lian,Zixuan Xu,Zichen Yun,Xiaohui Xu,Shixiong Liu,Qifei Luo,Majigsuren Zolzaya,Dacheng Liu
Background: Composite yeast culture (CYC) serves as an important functional feed additive. The content of its active ingredient, α-mannan, directly affects product quality and efficacy. However, due to the complex matrix of CYC, establishing a highly specific and accurate quantitative method for α-mannan remains a challenge.Methods: This study aimes to establish an analytical method based on enzymatic hydrolysis combined with high-performance liquid chromatography equipped with an ultraviolet detector (HPLC-UV) for the quantification of α-mannan in CYC. The method involved the specific enzymatic hydrolysis of α-mannan in the sample using α-mannosidase, followed by the release of mannose, which was then derivatized with 1-phenyl-3-methyl-5-pyrazolone (PMP) and analyzed by HPLC-UV. The actual content of α-mannan was calculated using a formula.Results: Method validation results showed that mannose exhibited good linearity within the concentration range of 0.5–400 μg/mL, with a correlation coefficient of 0.99998. The limit of detection (LOD) and limit of quantification (LOQ) were 0.063 mg/L and 0.208 mg/L, respectively. The average recovery rate was 88.020%−94.204%, with a relative standard deviation (RSD) ranging from 0.702% to 2.259%, indicating that the method has high accuracy and good precision.Conclusion: This study successfully established an efficient and reliable HPLC-UV detection method suitable for the specific quantitative analysis of α-mannan in CYC. The method exhibited good reproducibility and operational feasibility, providing robust technical support for quality control of CYC products and related functional component research.
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PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Tiantian Zha,Weitao Zhou,Jikai Chen,Yang Liu,Yifan Liu,Xu Wang,Xinxin Li,Boyu Li,Qi Han,Shan Du
Silk sericin (SS) hydrogels are attractive for soft-matter applications due to their natural origin, ease of processing, and superior hydrophilicity, yet their poor compressibility and structural stability remain key limitations. Here, we report a facile and scalable route for producing highly compressible ionic hydrogels by covalently grafting glycidyl methacrylate (GMA) onto SS (SS-g-GMA). The grafting density can be tuned between 81.26 % and 98.86 % simply by adjusting temperature and GMA dosage, yielding a UV-curable precursor that maintains excellent rheological properties. Photopolymerization generates a uniform, interconnected microporous network with pore sizes of average 27.24 μm pores, which imparts the hydrogel with an exceptional compressive stress of 70.03 kPa at 67.09 % strain and an ionic conductivity of 0.15 S m −1 . The recombination of hydrogen bonds facilitates rapid electrical self-healing (93.21 % recovery within 15 s). The stress-dependent resistance changes exhibit linear characteristics, rendering this compressible ionic hydrogel suitable for applications in stretchable electronics, biomedical scaffolds, and soft actuators.
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VIROLOGICA SINICA
·
2025
·
IF 4
Jia Wang,Zhongqiang Wu,Xiaoqin Yang,Chengfeng Lei,Xiulian Sun
Entomopathogenic viruses, such as baculoviruses and cypoviruses, have been employed as biological pesticides against agricultural and forestry pests. However, their susceptibility to inactivation under field UV radiation has limited broader application. In this study, we effectively improved the UV resistance of insect virus occlusion bodies (OBs) by coating their surfaces with silica nanoparticles (SiO 2 NPs). Monodisperse SiO 2 NPs with uniform size distribution and excellent colloidal stability were synthesized using the Stöber method. Subsequent amination modification of the SiO 2 NPs with a silane coupling agent shifted their isoelectric point from 3.2 to 8.1. This modification imparted a strong positive charge to the NPs within the pH range of 4.5–5.5, while the OBs of insect viruses remained negatively charged in this range. Consequently, the amino-functionalized SiO 2 NPs were successfully coated onto the surfaces of OBs of three representative insect viruses: nucleopolyhedrovirus, granulovirus, and cypovirus, through electrostatic interactions. Laboratory bioassays confirmed that Mamestra brassicae multiple nucleopolyhedrovirus (MbMNPV) coated with SiO 2 -NH 2 NPs retained its native viral pathogenicity against Spodoptera exigua larvae under normal laboratory condition, while it demonstrated 2.299–2.712 folds higher potency than MbMNPV physically mixed with unmodified SiO 2 NPs after UV irradiation. Outdoor trials revealed that SiO 2 -NH 2 NPs coating significantly improved the survival time of MbMNPV, with the median survival time increased from 1.43 days to 5.15 days. This nanoparticle coating strategy establishes a robust platform for developing photostable biopesticides while preserving their ecological safety profiles. The modular nature of this approach suggests its broad applicability across different entomopathogenic virus formulations.
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PubMed
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 10
·1900023
·
IF 7.125
Liang Chen,Wei Tian,Liangliang Min,Fengren Cao,Liang Li
Designing Si nanowire-based heterostructures provides a promising path to construct self-driven and broadband photodetectors, which are the key components for optoelectronic systems. Herein, the first fabrication of a p-CuIn 0.7 Ga 0.3 Se 2 nanoparticles/n-Si nanowire array core–shell structure through a simple two-stage process—spin coating and selenization treatment—and its integration into a self-driven photodetector are reported. The heterojunction photodetector is sensitive to broad wavelength range from UV light to visible and near-infrared light, with high detectivity of up to 1.6 × 10 13 Jones, large responsivity of 0.33 A W −1 , and an ultrafast response speed of 823/356 µs at zero bias. Additionally, this core–shell nanostructure exhibits good air stability and strong ability to detect weak light sources such as fluorescent lamp and lighter. The superior performance can be attributed to the strong light absorption of both Si and CuIn 0.7 Ga 0.3 Se 2 , the unique vertically standing core–shell structure, and effective photogenerated carriers' separation and transportation at the heterojunction interface.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Xin Lai,Jianfeng Hu,Jinqing Qu
The self-healing coating loaded with corrosion inhibitors has been proven to protect metals against harsh corrosive environments . However, the complex stimulation methods and inability to resist ultraviolet (UV) radiation greatly limit the further application of these coatings in intelligent corrosion protection . In this work, a self-healing epoxy (EP) coating activated by sunlight with photothermal conversion and UV resistance performances is developed by incorporating benzotriazole (BTA) and polydopamine-modified cerium oxide (mCeO 2 ) loaded poly (ε-caprolactone) (PCL) microspheres . BTA@PCL/mCeO 2 microspheres can not only endow composite coating with excellent anti-corrosion capability (|Z| 0.01Hz value of 1.97 × 10 9 Ω∙cm 2 ) but also achieve efficient photothermal self-healing under sunlight irradiation of 200 mW/cm 2 for 10 min. Based on the results of scanning electrochemical microscopy , the healing efficiency of composite coatings on scratched areas reaches 92.13 % after immersion for 24 h, which is much higher than 5.27 % of pure EP coatings. Profited from the UV absorption and free radical scavenging ability of BTA@PCL/mCeO 2 microspheres, the composite coatings still maintain stabilized impedance modulus values (3.62 × 10 8 Ω·cm 2 ) after 120 h of UV exposure. Therefore, this work offers a promising candidate for long-term corrosion protection under harsh application conditions.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jialong Zhu,Hong Fan,Jintao Wan
Transparent, hard, and flexible multifunctional coatings have a wide range of applications; however, most of them need organic solvents. Here, we present a solvent-free and UV-cured coating made from fluorinated epoxy MTQ silicone resin combined with branched triepoxy siloxane as the reactive diluent. After UV-initiated ring-opening polymerization in the presence of a triarylsulfonium hexafluoroantimonate catalyst, the resultant cured coating exhibits high transparency (∼92%, 550 nm), pencil hardness (7H), and flexibility (1 mm bending diameter) due to the formed organic–inorganic nanostructures in a highly cross-linked network. The triepoxy siloxane significantly reduces the viscosity before curing and increases cross-link density of the coating. The coating without any volatile content shows a smooth surface with low roughness (Rq = 0.46 nm) and delivers an anti-smudge ability owing to perfluorinated chains inherited from the MTQ resin. Furthermore, even after 3000 abrasion cycles, the coating still has a water contact angle greater than 90°, displaying excellent wear resistance. Our work provides a promising way to access high-performance multifunctional coatings in a more sustainable manner.
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PubMed
高影响因子
Plants-Basel
·
2025
·Vol. 14
·期 1
·133
·
IF 4.1
Wang Yu,Xiangru Zhou,Jinhao Meng,Hongwei Xu,Xiaofu Zhou
The depletion of the ozone layer has resulted in elevated ultraviolet-B (UV-B) radiation levels, posing a significant risk to terrestrial plant growth.Rhododendron chrysanthumPall. (R. chrysanthum), adapted to high-altitude and high-irradiation environments, has developed unique adaptive mechanisms. This study exposedR. chrysanthumto UV-B radiation for two days, with an 8 h daily treatment, utilizing metabolomic and transcriptomic analyses to explore the role of WRKY transcription factors in the plant’s UV-B stress response and their regulation of flavonoid synthesis. UV-B stress resulted in a significant decrease in rETR and Ik and a significant increase in 1-qP. These chlorophyll fluorescence parameters indicate that UV-B stress impaired photosynthesis inR. chrysanthum. Faced with the detrimental impact of UV-B radiation,R. chrysanthumis capable of mitigating its effects by modulating its flavonoid biosynthetic pathways to adapt positively to the stress. This study revealed changes in the expression of 113 flavonoid-related metabolites and 42 associated genes, with WRKY transcription factors showing significant correlation with these alterations. WRKY transcription factors can influence the expression of key enzyme genes in the flavonoid metabolic pathway, thereby affecting metabolite production. A theoretical reference for investigating plant stress physiology is provided in this work, which also offers insights into the stress responses of alpine plants under adverse conditions.
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PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Xiaojia Wang,Hongyu Zhu,Yina Yang,Guoqiao Lai,Xiongfa Yang
Food safety and food freshness issues have become important concerns for consumers and hydrogels with high antibacterial efficiency, low toxicity and pH−sensitive colorimetric intelligence are one of candidates to meet the requirement of food package and food spoilage monitoring. Nevertheless, hydrogels prepared only by assembling the ingredients with non−covalent interactions through time−consuming molding process usually encounter drawbacks such as relatively poor mechanical properties, stability and thermal stability, which always restrict their further applications. To overwhelm these shortcomings, UV−curable choline chloride (ChCl) and bromophenol red (BR) covalent functionalized antibacterial and pH−sensitive cross−linked hydrogels (UV−hydrogels) were developed in this paper. The UV−hydrogels possessed good thermal stability because the initiated thermal decomposition temperature (T d5 ) is in the range of 135.8–184.7 °C. The DMA analysis revealed that the UV−hydrogels are with good mechanical properties because the elongation at break is in the range of 117–525% and the tensile strength is in the range of 0.8–2.7 MPa. The UV−hydrogels with BR groups exhibited naked eye visible color variation from yellow to dark blue-green with the variation of the pH values from 2 to 14. The antibacterial efficiency of the UV−hydrogels against S . aureus , E . coli and M . albican increased with the increment of covalent−grafted ChCl amount. Cytotoxicity assay demonstrated that the UV−hydrogels are low toxicity against L929 cells. The experiment of monitoring freshness of beef denoted the UV−hydrogels have potential application in animal–derived high protein food packaging and freshness monitoring.
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危险品化学品经营许可证（带存储）