Arabian Journal of Chemistry
·
2024
·
IF 5.3
Xiaohui Sun,Wei Li,Zijun Dong,Yunhe Hou,Yuyang Ning,Chenyu Wang,Guo Lv
During the COVID-19 pandemic, the extensive use of ribavirin (RBV) raised concerns about its environmental residues and associated risks, necessitating remedial actions. This study investigates the degradation efficiency, mechanism, and biotoxicity of RBV using ferrous (Fe 2+ ) activated persulfate (PS) advanced oxidation technology (Fe 2+ /PS oxidation). Experiments conducted under various conditions revealed that at pH = 3, PS concentration of 4 mM, PS/Fe 2+ molar ratio of 2:1, and citric acid of 0.5 mM with Fe 2+ added twice, the degradation rate of RBV reached 98.70 %. The degradation process of RBV by Fe 2+ /PS from 0 to 5 mins followed a first-order reaction kinetics model. The presence of halide ions (Cl - , Br - , I - ) was found to inhibit the degradation efficiency. The active species involved were identified as SO 4 - ·, ·OH, 1 O 2 , and FeO 2+ , with SO 4 - · and ·OH being the most significant. Moreover, the products of ribavirin were determined and their degradation pathways were proposed. Dehydration, deamidation, C-N bond breaking and hydroxylation were the major pathways. Additionally, toxicity assessment showed that Fe 2+ /PS oxidation reduced the inhibition rate of bioluminescence in Vibrio fischeri from 31.58 % to 3.88 %, effectively controlling RBV toxicity during the reaction. This study provides insights into managing water environmental risks associated with pharmaceutical residues in the post-pandemic era.
研究领域:
环境科学
·
药学
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DOI
高影响因子
Arabian Journal of Chemistry
·
2024
·
IF 5.3
Qingqing Wang,Wei Zhang,Fangping Zhong,Wenchao Yang,Xiuhai Gan
Photosynthesis system Ⅱ (PS Ⅱ) inhibitors can block electron transport and disrupt plant photosynthesis and are used as herbicides. In order to develop new and effective PS II inhibitors, the lead structure lawsone was first found with remarkable herbicidal activity based on a virtual screening strategy, and its derivatives were designed and synthesized. The results of herbicidal activity evaluation showed that most of the compounds could achieve more than 80 % inhibitory effect on roots and stems of Portulaca oleracea at a dose of 100 μg/mL. Meanwhile, compound 4d showed more than 90 % inhibition on the stem of P. oleracea and on the root of Echinochloa crusgalli, which were superior to lawsone (64.9 and 67.6 %) and atrazine (63.6 and 65.9 %), respectively. Interestingly, 4d exhibited 100 % post-emergence herbicidal activity to Amaranthus retroflexus and Abutilon theophrasti at a dosage of 300 g a.i./ha, which was similar to atrazine but superior to lawsone. In addition, compound 4d can affect the efficiency of the photochemical process and strong bind PS II D1 protein. It revealed that compound 4d can be used as a promising PS II D1 inhibitor. This study provides a promising lead compound for developing new PS II inhibitors.
研究领域:
植物学
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药理学
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农业科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Ying Chen,Fengyuan Zhang,Xiaoshuang Shi,Mingyi Lu,Kang Qin,Quan Feng,Rongbo Guo
This paper aims to improve the biological nitrogen removal performance by using magnetic polystyrene composite microparticles (PS@Fe 3 O 4 ). Three types of PS@Fe 3 O 4 with different surface morphologies were prepared by in-situ emulsion polymerization . Then, the optimum was creatively used as a biofilm carrier to form magnetic activated sludge (MAS) in lab-scale reactors. Compared to the conventional activated sludge , the utilization of PS@Fe 3 O 4 accelerated the sludge settling velocity to 0.76 m/h. In addition, the ammonium nitrogen removal, total nitrogen removal and simultaneous nitrification and denitrification improved by 7.08%, 24.27% and 19.53%, respectively. The dissolved oxygen concentration and pH were observed to reveal the effect of PS@Fe 3 O 4 on the nitrogen removal process. Based on microbial community analysis, there were more nitrifying and denitrifying bacteria in the MAS. Therefore, the novel developed PS@Fe 3 O 4 can be a promising utilization material as a biofilm carrier for biological wastewater treatment .
研究领域:
环境工程
·
微生物学
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DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Junwang Liu,Mingting Zhang,Lizhu Guan,Chunfeng Wang,Lei Shi,Yi Jin,Chao Han,Jihua Wang,Zhidong Han
The composite system composed of polymer, conductive and dielectric filler has excellent dielectric properties. Herein, by studying the effect of filler distribution on the composite system's performance, the graphene nanoplatelets/Polystyrene (GNP/PS)/Barium titanate/Polyvinylidene Fluoride (BT/PVDF) selective composite system is prepared. When the conductivity and dielectric loss change little, the dielectric constant and breakdown field strength of the selective composite system are improved obviously. In the selective composite system, as the dielectric constant is between 12 and 13, the characteristic breakdown field strength is as high as 25.8 kV/mm, which is over three times higher than it of the pure composite system. It is because the addition of BT and GNP particles enhances the establishment of polarization. Besides, the blending of PVDF and PS improves the breakdown field strength of the material. Comprehensive properties of the material are enhanced. Therefore, this study provides a basis for the subsequent study of dielectric materials.
研究领域:
材料科学
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电气工程
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产品关联
DOI
高影响因子
International Journal of Environmental Science and Technology
·
2013
·Vol. 11
·期 4
·881-890
·
IF 1.844
Deng J.,Shao Y.,Gao N.,Deng Y.,Tan C.,Zhou S.
Zero-valent iron (Fe 0 ), as an alternative iron source, was evaluated to activate persulfate (PS) to degrade acetaminophen (APAP), a representative pharmaceutically active compound in water. Effects of key factors in the so-called Fe 0 /PS process, including Fe 0 dosage, initial pH, temperatures and chelating agents, were studied. Under all the conditions tested, the APAP degradation followed a pseudo-first-order kinetics pattern. The degradation efficiency of APAP was highest when the Fe 0 to PS molar ratio increased to 1:1, and the degradation rate constant and removal were 23.19 × 10 −3 min −1 and 93.19 %, respectively. Comparing with Fe 2+ , Fe 0 served as an alternative iron source that can gradually release Fe 2+ into water, thereby consistently activating PS to produce sulfate radicals. The Fe 0 /PS system was effective in a broader pH range from 3 to 8.5. Heat could facilitate production of sulfate radicals and enhance the APAP degradation in the Fe 0 /PS system. High reaction temperature also improved the Fe 2+ /PS oxidation of APAP. Finally, sodium citrate (a chelating agent) at an appropriate concentration could improve the APAP degradation rate in the Fe 2+ /PS and Fe 0 /PS system. The optimal molar ratio of Fe 0 to citrate depended on solution pH. Our results demonstrated that Fe 0 was an alternative iron source to activate PS to degrade APAP in water.
研究领域:
环境科学
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化学工程
·
水处理
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DOI
高影响因子
Membranes
·
2023
·Vol. 13
·期 10
·807
·
IF 4.2
Yixia Zhao,Zehao Zhang,Yan Zhang,Yuting Huang,Yanfei Chen,Bofei Chen,Weimin Kang,Jingge Ju
Recently, the multi-level interwoven structured micro/nano fiber membranes with coarse and fine overlaps have attracted lots of attention due to their advantages of high surface roughness, high porosity, good mechanical strength, etc., but their simple and direct preparation methods still need to be developed. Herein, the multi-level structured micro/nano fiber membranes were prepared novelly and directly by a one-step electrospinning technique based on the principle of micro-phase separation caused by polymer incompatibility using polystyrene (PS) and polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as raw materials. It was found that different spinning fluid parameters and various spinning process parameters will have a significant impact on its morphology and structures. Under certain conditions (the concentration of spinning solution is 18 wt%, the mass ratio of PS to PVDF-HFP is 1:7, the spinning voltage is 30 kV, and the spinning receiving distance is 18 cm), the PS/PVDF-HFP membrane with optimal multi-level structured micro/nano fiber membranes could be obtained, which present an average pore size of 4.38 ± 0.10 μm, a porosity of 78.9 ± 3.5%, and a water contact angle of 145.84 ± 1.70°. The formation mechanism of micro/nano fiber interwoven structures was proposed through conductivity and viscosity tests. In addition, it was initially used as a separation membrane material in membrane distillation, and its performance was preliminarily explored. This paper provides a theoretical and experimental basis for the research and development of an efficient and feasible method for the preparation of multi-level micro/nano fiber membranes.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 2
·399-407
·
IF 1.6
Zu Jianhua,Pan Xiaohan,Han Gang,Xue Yi,Diao Jingjie,Liu Siyu
A novel resin (PS-TMMA) with double functional groups exhibited high adsorption selectivity toward 99 TcO 4 − from the coexisting fission products (Sr, Eu, Dy, Cs) in 0.1–1 mol/L HCl. On the contrary, in neutral medium K d of PS-TMMA resin towards lanthanide elements was much higher than Tc. The results of column chromatography showed that light lanthanide was firstly penetrated on the column. Using 0.01 mol/L 2-hydroxyisobutyric acid as eluent, the adsorbed lanthanides could be effectively eluted at pH 3.03, and the light and heavy lanthanides were partially separated in effluents.
研究领域:
放射化学
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分离科学
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核化学
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产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Jun-Yang Yan,Chun-Yan Cao,Gui-Ping Cao,Shao-Feng Pan,Hui Lv,Alaaddin M. M. Saeed
Traditional heterogeneous catalysts are affected in the catalytic hydrogenation of PS by the scale effect, viscosity effect, adhesion effect, and conformational effect, resulting in poor activity and stability. Monolithic Pd-CNTs@FN catalysts could eliminate or weaken the impact of these negative effects. We grew nitrogen-doped carbon nanotubes (NCNTs) on monolithic-foamed nickel (FN) and investigate their growth mechanism. Meanwhile, the feasibility of using the NCNTs@FN carrier for PS hydrogenation reaction was also verified. The growth of NCNTs on FN can be divided into 3 stages: initial growth stage, stable growth stage, and supersaturation stage. Finally, a three-layer structure of NCNT layer, dense carbon layer, and FN skeleton is formed. Two types of structures, nickel-doped carbon nanotubes (NiCNTs) and C–Ni alloy, are formed by combining C and Ni, while four nitrogen-doped structures, NPD, NPR, NG, and NO, are formed by C and N. The prepared carrier exhibited an extremely outstanding specific surface area (2.829 × 106 cm2/g) and strength (no NCNTs falling off after 24 h 500 rpm agitation), as well as high catalytic activity for PS hydrogenation after loaded with Pd (2.13 ± 0.95 nm), with a TOF of up to 27.6 gPS/(gPd•h). After 8 repetitions of the catalyst, there was no significant decrease in activity. This proves the excellent performance of Pd-NCNTs@FN in polymer hydrogenation reactions, laying a solid foundation for further research on the mechanism of NCNTs promoting PS hydrogenation and regulating the growth of NCNTs.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2018
·
IF 1.551
Ju Lv,Xueqiong Yin,Rongguo Li,Junhua Chen,Qiang Lin,Li Zhu
Superhydrophobic composite nanofibrous membranes(PP) were prepared from polycaprolactone (PCL)/polystyrene (PS) through solution blow spinning with an airbrush for oil adsorption. PP membranes were characterized by fourier transform infrared spectroscopy, scanning electron microscopy, water contact angle, X-ray Photoelectron Spectroscopy, X-ray diffractometer, and thermogravimetric analysis instrument. The effects of mass ratio of PCL and PS on the morphology, porosity, density, cyrstallinity, thermal stability, and oil adsorption ability were investigated. PP membranes had higher density than PCL and PS, while better hydrophobicity. The saturation adsorption capacity of PP to peanut oil, motor oil, and diesel oil is 16.89 g/g, 20.33 g/g, and 12.17 g/g, respectively. After 6 cycles of reutilization, the adsorption capacity to peanut oil, motor oil, and diesel oil remained at 6.16, 7.46, and 5.33 g/g, respectively, higher than that of pure PCL membrane.The water/oil adsorption selectivity of PP was about 7:100. PP had higher oil adsorption capacities and better water/oil adsorption selectivity than the commercial oil absorbent polypropylene. PP membrane could be prepared and used in situ to separate oil from oil/water mixture. POLYM. ENG. SCI., 59:E171–E181, 2019. © 2018 Society of Plastics Engineers
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
MARINE POLLUTION BULLETIN
·
2023
·
IF 5.8
Chen Zhang,Yuhong Qi,Yarui Guo,Shukun Zhang,Gang Xiong,Kaixuan Wang,Zhanping Zhang
Polystyrene microspheres compounded with polyethylene glycol–based hydrogel (PS-PEG)/polydimethylsiloxane (PDMS) coatings were prepared using the physical blending method. The chemical structure, surface and interface properties, interlayer adhesion, and tensile properties were tested in this paper. Furthermore, the antifouling performance was evaluated through bovine serum albumin fluorescent protein adsorption testing, marine bacteria adhesion testing, and benthic diatom adhesion testing. The results showed that the coating performance was best when 20 wt% PS-PEG hydrogel was added. Its surface energy was only 19.21 mJ/m 2 , the maximum breaking strength was 1.24 MPa, the maximum elongation rate was 675 %, the elastic modulus was 2.53 MPa, and the anti-stripping rate was 100 %. In addition, the coating with added 20 wt% PS-PEG hydrogel bacterial adherence rate was 5.36 % and 2.45 % after rinsing and washing, respectively, and the removal rate was 54.29 %. In the benthic diatom adhesion test , the chlorophyll concentration a-value was only 0.0017 mg/L after washing with added 20 wt% hydrogel, and the protein desorption rate was 84.19 % higher than PDMS in the fluorescent protein adsorption test. This coating has the ‘low adhesion’ and ‘desorption’ characteristics in the three growth stages of biofouling. Meanwhile, the low surface energy of the silicone is stable, and the hydrogel also dynamically migrates to the surface to gradually form a hydration layer, both are synergistic. When 20 wt% PS-PEG hydrogel was added, the coating demonstrated excellent antifouling performance due to its high hydration layer, low surface energy, high elasticity, and high interlayer adhesion. This research is expected to contribute to the practical applications of hydrogel coatings in marine antifouling.
研究领域:
材料科学
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海洋生物学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xingya Zhu,Wenting He,Yiqian Guo,Liangliang Wei,Dongrui Liu,Hongbo Guo,Hui Peng
Calcium-magnesium-alumina-silicate (CMAS) deposits significantly accelerate the degradation of thermal barrier coatings (TBCs) in advanced aeroengines, thereby posing a substantial threat to aviation safety. In this study, (Gd 0.2 Y 0.8 ) 3 Al 5 O 12 (GYAG)/YSZ double-ceramic-layer thermal barrier coatings (TBCs), comprising dense GYAG on top and columnar YSZ beneath, were fabricated via plasma spray-physical vapor deposition (PS-PVD) in a single-step process to mitigate CMAS attack. High-temperature exposure tests at 1250 °C demonstrated the excellent phase stability of GYAG coating and interface stability of GYAG/YSZ coating. The interactions between CMAS and GYAG/YSZ coatings were investigated. Results showed that CMAS melt infiltration was suppressed. GYAG coating reacted rapidly with CMAS to crystallize apatite, garnet and anorthite phases with high-melting-point. These crystalline phases are alternatively distributed and collectively inhibit CMAS infiltration. The doping of Gd in GYAG coating facilitated precipitation of apatite, which is crucial for CMAS resistance enhancement.
研究领域:
材料科学
·
表面工程
·
航空发动机
·
高温材料
·
涂层技术
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Fang Peng,Meilin Chu,Jiajia Sun,Yuhong Liu,Qicheng Zhang,Yajun Chen,Fenghe Wang,Wenbo Zhao
The electrochemical immunosensor was fabricated by immobilizing alpha-fetoprotein (AFP) antigen onto the magnetic glassy carbon electrode (MGCE) that modified by Fe 3 O 4 @polystyrene (PS)/polydopamine (PDA)-Au nanotubes . The aim of this study was to develop a new route to prepare Fe 3 O 4 @PS/PDA-Au nanotubes with well dispersed Au nanoparticles (AuNPs). The immune detection platform showed good analytical performance for determination AFP in a linear range of 0.01–100 ng/mL with a correlation coefficient of 0.9970 under optimal conditions. The detection limit was calculated to 0.0088 ng/mL (S/N = 3). In addition, the good detection results of AFP in human serum were obtained by the immunosensor. The use of composite nanotubes to build advanced biosensing interface will bring more possibilities for future biomedical detection.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）