Journal of Water Process Engineering
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2024
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IF 6.3
Zekun Dong,Jie Yao,Yu Tang,Yan Jia,Yan Zhang,Hongyuan Liu
Electro-peroxone (EP) as an innovative advanced oxidation process exhibits substantial potential for the degradation of ozone-resistant compounds (ORCs). In this work, an electrochemically modified graphite felt (GF) served as the cathode of EP process, facilitating the rapid degradation of multiple ORCs including oxalic acid (OA), formic acid, acetic acid and pyruvic acid. Hydroxyl radical ( · OH) as the major reactive species was derived from three pathways, i.e., the conversion of O 3 , one-electron reduction of O 3 (1e − O 3 reduction) and the electro-driven peroxone (EDP) reaction. pH, current density and gas O 3 concentration profoundly impacted · OH formation via these three pathways. · OH tended to be generated with the increase of pH and current density, but there was also a risk of being quenched by carbonate and hydrogen peroxide. The excellent removal rate of OA (about 80 %) was obtained at pH of 5–9 and current density of 1–2 mA cm −2 . The formation pathway of · OH shifted from 1e − O 3 reduction to EDP reaction with the increase of gas O 3 concentration. Cathodic behaviors of the EP process showed that reducing current density and increasing of pH and gas O 3 concentration could inhibit the occurrence of undesired reactions (e.g., H 2 O 2 reduction and H 2 O reduction), and improve the competitiveness of EDP reaction. The new insights into the mechanism of · OH formation emphasized the crucial role of maximizing the EDP reaction for effective removal of ORCs.
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JOURNAL OF CATALYSIS
·
2025
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IF 6.5
Tianhao Zhang,Hanwen Yan,Chong Zhang,Yiqian Yang,Jie Li,Guoliang Zhang,Junping Zhang,Gang Wang,Chunshan Li
Effective strategy is intensively desired to construct efficient and durable catalytic system for mild aldol condensation between aldehydes, considering the profound significance in synthesis of high-valued α , β -unsaturated aldehydes. Although series of mild catalytic systems using secondary amine-based catalysts have been proposed, the compatibility of high catalytic selectivity and durability still troubles the researchers in this field. Here, we developed a protonated diethanolamine ionic liquid catalyzed mild aldol reaction system with reasonable regulation of ion pair strength and ionic cluster microenvironment based on the deep insights into proton shuttle effects to improve catalytic selectivity and durability for the probed methacrolein synthesis. The interplay between the cation and anion mediated proton shuttle was elucidated by detailed kinetics derived from in situ Raman spectroscopy and theoretical calculations. Further experimental and characterization facts combined with molecular dynamic simulations identify the weak interaction of cation–anion pair and metastable worm-like cluster microenvironment facilitate proton shuttle and thus improve catalytic performance and durability. Consequently, the formation rate of methacrolein was enhanced by one fold, while overall side reaction rates were reduced by 27.5% compared to the conventional sec -amine catalyst. Additionally, this strategy also exhibited significant promotion in catalytic activity, selectivity, and durability in synthesis of the other representative α , β -unsaturated aldehydes. These findings will offer reference for the construction and modulation of ionic liquid catalyzed mild aldol reaction system utilizing proton shuttle effects.
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Journal of Materials Chemistry A
·
2025
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IF 9.5
Chaohui Guan,Jiefei Li,Tao Chen,Liang Lv,Junfeng Du,Shuai Zhang,Hang Wei,Haibin Chu
Developing high performance catalytic materials for the electro-oxidation of glycerol into specific value-added products is essential for glycerol valorization. Herein, we used the sol–gel method to coat the TiO2 layer with adjustable thickness on the surface of carbon nanotubes (CNTs), obtaining a unique morphology of porous sheath TiO2 wrapped CNTs (TiO2/CNTs). Subsequently, Pt nanoparticles were loaded onto TiO2/CNTs using the ethylene glycol reduction method. The prepared Pt–TiO2/CNTs catalyst achieves a glycerol conversion near 100% at 0.8 V vs. RHE and 60 °C for 10 h. Notably, the selectivity of tartronate reaches 52.5% after 24 h. Characterization results reveal that the dispersed Pt nanoparticles are embedded into the holes of the TiO2 porous sheath, fabricating abundant Pt–TiO2–CNT interface structures. The infusion of TiO2 shifts the center of the d-band upwards, and enhances the adsorption of the glycerate intermediate on Pt particles, which facilitates the further oxidation of glycerate to tartronate. This simple and efficient morphology control method provides a new strategy for glycerol valorization via electrocatalysis.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Zhuangzhuang Xiong,Wenhui Zhang,Siyuan jin,Ruizhi Wu,Fuqiu Ma,Xingwei Wang,Guixiang Wang
In recent years, metal–organic framework materials (MOFs) have garnered significant attention in the field of metal corrosion protection. In this study, novel Co-MOFs were synthesized using cobalt nitrate as the metal source and 4,4′-bipyridine as the organic ligand. A one-step solvothermal method was employed to synthesize a black MOFs/LDH composite coating, integrating corrosion resistance, friction reduction, and hydrophobicity into a single coating. The successful reaction between metal ions and organic ligands was confirmed through FTIR, FE-SEM, EDX, XRD, and XPS characterization tests. Cross-sectional SEM and EDX analyses demonstrated the successful synthesis of the coating. Electrochemical tests indicated that after 14 days of immersion in 3.5 wt% NaCl, the composite coating exhibited the lowest corrosion current of 2.23 × 10 −9 A∙cm −2 , outperforming the aluminum substrate (5.99 × 10 −6 A∙cm −2 ) and anodized aluminum (7.08 × 10 −7 A∙cm −2 ). Hydrophobicity tests showed that without additional modification with low surface energy substances, the composite coating had a contact angle of 154.7°, demonstrating excellent hydrophobicity. Tribological tests revealed that the composite coating exhibited superior tribological performance, with a friction coefficient of 0.3.
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
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2024
·Vol. 221
·期 16
·2400121
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IF 1.9
Xiaoli Ji,Ruochen Qiao,Zhihao Xu,Jian Liu,Haoze Yuan
Herein, multiwalled carbon nanotube (MWCNT)/silicon nitride (Si 3 N 4 )/polyaniline (PANI) ternary composites are prepared. The preparation method involves attaching carboxyl groups to acid-modified MWCNT surfaces and amino groups to Si 3 N 4 surfaces modified using a silane-coupling agent. Then they are combined to binary composites using the solvent-thermal method. Finally, the ternary composites are prepared by coating PANI on the surface of MWCNT/Si 3 N 4 composites in situ polymerization. The morphology and structure of these composites are characterized through X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Results show that the reflection loss at 8.8 GHz reaches −42.57 dB when the feeding ratio of MWCNT:Si 3 N 4 :PANI is 3:20:40 and the corresponding effective absorption bandwidth reaches 4.06 GHz when the thickness is 3.5 mm. A conductive network with effective electron leaps is formed among MWCNT, Si 3 N 4 , and PANI, which increases the conductive loss of the composites. An abundant number of interfaces have formed in the composite materials and promoted dielectric loss. Multiple loss mechanisms and good impedance matching performance endow MWCNT/Si 3 N 4 /PANI with excellent microwave absorption performance, and the incorporation of Si 3 N 4 enables the composites to exhibit satisfactory high-temperature resistance. Thus, these performances render the composites promising materials to address increasing electromagnetic pollution, particularly at high temperatures.
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JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
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2024
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IF 1.2
Xiaoli Ji,Zhihao Xu,Jian Liu,Ruochen Qiao,Haoze Yuan
MWCNT/Fe3O4/Si3N4 composite was synthesized via hydrothermal synthesis. The morphology and structure of MWCNT/Fe3O4/Si3N4 were investigated by means of SEM, XPS, XRD, and FT-IR. Their electromagnetic parameters were measured by a vector network analyzer. The microwave attenuation properties of as-synthesized composite could be modulated by regulating the feed ratio of MWCNT, Fe3O4, and Si3N4. According to the different amounts of modified nano Fe3O4 added, they are labelled as S1-S3. When the feed ratio is 3:15:20, the maximum reflection loss value of the sample is −23.3 dB at 14.4 GHz, the corresponding thickness is 2.5 mm, and the corresponding effective absorption bandwidth is 5.36 GHz. Moreover, the test results of the thermogravimetric analyzer show that the composite material has excellent heat resistance. Our research results provide a reference value for the development of excellent heat resistance and high-performance MWCNT-based microwave absorption composite materials.
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Heliyon
·
2024
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IF 3.4
Yanbo Wang,Yana Zhao,Yurong Guo,Wanyu Han,Zhijun Zhang,Tianyu Hou,Huizhen Li,He Li,Qinqin Wang
Perilla frutescens L. essential oil (PLEO) has antibacterial and antioxidant properties, which can effectively maintain the quality of fruits and extend their shelf life. In this study, sodium alginate and chitosan were used as wall materials, and PLEO microcapsule powder was used as the core materials to prepare PLEO hydrogel beads. The best results were obtained by using 2%w/v sodium alginate and 1.5%w/v chitosan as wall materials, with a core-to-wall ratio of 2:1 and homogenized for 15 min producing PLEO hydrogel beads with encapsulation efficiency of 82.61 %. For strawberries preservation, PLEO hydrogel beads preservation group had a better effect after 5 d of storage, showing a lower decay rate (15.71 %), better maintaining the hardness of 1.75 kg/cm 2 , and a weight loss of 3.29 %. Furthermore, organic acids and total phenols were retained more in this group, the number of microorganisms was significantly reduced, and sensory qualities were improved, especially taste and color. This study provides important insights into the application of natural preservatives in the food industry and promotes sustainable practices in food preservation.
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PubMed
高影响因子
LANGMUIR
·
2025
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IF 3.9
Yunlei Cen,Yuanyuan Zhou,Mingshi Zhu,Ke Zheng,Shaoqi Zhou
In this work, Ti/TiO2-RNTs/SnO2–Sb–Ni-La electrodes were developed in three deposition stages. TiO2-RNTs improved the bonding of the bottom layer, and Ni–La codoping resulted in higher film stability. Compared with other electrodes, this electrode exhibits excellent performance with a denser structure, higher OEP (2.17 V), lower Rct (5.36 Ω), longer electrode strengthening life, and larger active specific surface area. The degradation of oily wastewater revealed an oil removal rate equal to 97.88% under optimal conditions. In comparison to the Ti/TiO2-RNTs/SnO2–Sb obtained via the one-step hydrothermal technique, the service life improved by 8.60 times, and the degradation rate (RD) of the current electrode (k = 0.0254 min–1) was enhanced by 2.67 times, whereas the removal rate remained stable after 10 cycles. Under the continuous attack of free radicals such as •OH, 48 types of organic matter in wash oil were decomposed, and most of the alkanes and polycyclic aromatic hydrocarbons were mineralized. Compared with direct current, pulse current electrolysis of the oil-washing wastewater can save 47.95% electrical energy, and the energy consumption of chemical oxygen demand removal per unit mass can be reduced by 72.02%. Therefore, the Ti/TiO2-RNTs/SnO2–Sb–Ni-La pulse electrochemical oxidation method is expected to reduce energy loss and improve the electrochemical treatment of oily wastewater.
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NEW JOURNAL OF CHEMISTRY
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2025
·
IF 2.5
Lijun Wang,Aiying Hou,Min Wang,Armando A. Paneque Quevedo,Qiaoli Yue
In this study, blue-fluorescent black phosphorus quantum dots (BPQDs) were synthesized through a combination of liquid-phase ultrasonication and solvothermal techniques. Black phosphorus (BP) crystal powder, isopropyl alcohol (IPA) and NaOH were employed as precursor, solvent, and to adjust the reaction environment, respectively. BPQDs exhibited optimal fluorescence characteristics, with excitation and emission wavelengths measured at 322 and 392 nm, respectively. Notably, 4-nitrophenol (4-NP) induced static fluorescence quenching of BPQDs, causing a reduction in their quantum yield from 7.8% to 4.4%. A linear correlation was observed between the fluorescence quenching intensity and 4-NP concentration, spanning a range from 0.1 µM to 120 µM, with a limit of detection as low as 43 nM. Furthermore, a portable test strip was developed, which undergoes a color change to yellow upon exposure to 4-NP, enabling selective detection. By analyzing the color of the strip through smartphone photography to obtain red, green and blue (RGB) values, a linear relationship was established between R/B ratio and 4-NP concentration within the range of 10-150 µM, facilitating quantitative analysis. This study demonstrates the effectiveness of BPQDs-based fluorescent probes and portable test strips for the detection of 4-NP in various water samples, including lake water, tap water and laboratory waste effluent.
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JOURNAL OF CHROMATOGRAPHY A
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2025
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IF 4
Wei-Qi Xie,Yi-Xian Gong
This investigation established an innovative gas-evolving headspace technique for determining vanadium pentoxide. The methodology capitalizes on quantitative CO 2 measurement via GC where the target analyte undergoes redox transformation with oxalic acid under acidic conditions within a sealed vial system. Experimental validation confirmed the technique's robust performance characteristics, exhibiting excellent measurement reproducibility and satisfactory spike recovery rates across validation samples. This automated headspace GC approach presents significant advantages for industrial-scale analysis of vanadium pentoxide products. Moreover, this novel method offers a template for developing indirect quantifications via gas-evolving headspace analysis.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Han Lijuan,Chai Keyi,Du Xinyu,Wang Xiangtong,Zhang Ping,Wang Xiaotian
Tetracycline poses a serious threat to the ecosystems even if the concentration is very low due to its structural stability. In this work, a series of magnetic separable Fe 3 O 4 /ZnO/g-C 3 N 4 composite with excellent degrading tetracycline performance were prepared. And, repeated calcination method was used to strengthen the bonding effect of single component improving the formation of heterojunction. Electrochemical analysis confirmed that the ZnO/g-C 3 N 4 and Fe 3 O 4 /ZnO/g-C 3 N 4 heterojunctions were generated, effectively accelerating the electron separation and transfer in photocatalytic process. The characterization results also showed that ZnO and Fe 3 O 4 nanoparticles are evenly distributed on the surface of g-C 3 N 4 . With the increase of the loading mass concentration of ZnO/g-C 3 N 4 , the degradation rate of tetracycline on Fe 3 O 4 /ZnO/g-C 3 N 4 composite increased and then decreased. The degradation rate of tetracycline on optimal Fe 3 O 4 /ZnO/g-C 3 N 4 composite reached to 94.50% while the TC mineralization rate reached to 61.61% under visible light irradiation for 120 min, exhibiting excellent photocatalytic performance. Due to the effect of Fe 3 O 4 , Fe 3 O 4 /ZnO/g-C 3 N 4 materials exhibited good magnetic property, which is beneficial to separation and recovery of photocatalysts. The reusability experiment showed that the degradation rate of tetracycline was 80.66% after five cycles, displaying good reusability.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Jia Guo,Yongqi Zhao,Junjie Jiang,Xiaolong Liu,Yongqiang Wang,Huazhen Chang,Tingyu Zhu
Selective catalytic reduction (SCR) with ammonia (NH 3 ) is an established method for NO x elimination. However, the catalytic activity of conventional VW/Ti catalysts declines sharply at ultra-high temperatures (above 700 °C). To address this limitation, this study employed machine learning (ML) to optimize high-temperature SCR catalysts. A gradient boosting decision tree (GBDT) model with Shapley Additive Explanations (SHAP) identified calcination temperature, crystal phase, and surface acidity as the key factors influencing catalytic performance. Based on these insights, a designstrategy was developed for VW/Ti catalysts under ultra-high temperature conditions and successfully identified a catalyst exhibiting excellent resistance to high-temperature degradation through evaluation and characterization. Experimental validation confirmed that Si doping significantly improves catalytic activity and thermal stability, with the VW/5Ti1Si-800 catalyst demonstrating superior performance. This study highlights the effectiveness of combining ML and experimental approaches to mitigate high-temperature deactivation in SCR catalysts.
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