CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3787-3797
·
IF 2.3
Han Zhaohao,Chu Qingyan,Wang Hao,Jia Xiaoqiong,Jiang Peng,Li Tong
We successfully synthesized a bifunctional alkaline catalyst (Co@CTS-1), on the one hand, which demonstrates exceptional catalytic performance in the aerobic oxidation of alkenes, particularly in the epoxidation of styrene, in the absence of both an initiator and a co-reducing agent, achieving a conversion rate of 74.94%, a selectivity of 71.84% for styrene oxide; on the other hand, the catalyst maintained its high activity throughout a cyclic reaction run lasting up to 2500 min, demonstrating exceptional stability in the epoxidation of styrene. The Co@CTS-1 catalyst utilizes TS-1 as the carrier, and it is modified with cobalt and cerium elements. Through the embedding of cobalt elements within the TS-1 cage, the catalyst gains the ability to activate O 2 , and by inserting cerium elements into the atomic positions of silicon, the conversion rate is further enhanced. This encapsulated structure stabilizes cobalt nanoparticles, overcoming the short lifespan issues caused by sintering and leaching in conventional supported catalysts. This work provides practical clues for the development and application of novel catalysts, and will inspire the advancement of olefin air epoxidation. Graphical
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IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 9
·1189-1197
·
IF 3.1
Luo Yanrong,Lu Chunlan,Zhang Xiaolin,Zhan Shiping
With the widespread use of hydrogels, injectable hydrogels for the human body require higher safety and non-toxicity. The most important is the choice of cross-linking agent to be green. In this study, acylated chitosan macromolecular crosslinkers (MCS) were prepared by maleic acid (MA) and chitosan (CS). Its structure was confirmed by FTIR and 1 H NMR and its degree of acylation was also determined. Then, a series of polymeric network hydrogels were investigated. The cross-linked copolymer poly( N -isopropyacrylamide-maleic acid copolymer)/acylated chitosan P(NIPAM- co -MA)/MCS is a series of thermosensitive hydrogels formed by free radical polymerization of NIPAM and MA with MCS as cross-linking agent. The apparent morphology, thermosensitive transition point, and hydrophilicity were investigated. The results show that the hydrogel has a homogeneous pore structure inside. The optimal low critical solution temperature (LCST) was 36.66 ℃. In addition, with the increase of maleic acid content, the water contact angle of the hydrogel is smaller, that is, the hydrophilic effect is better. The results indicate that the P(NIPAM- co -MA)/MCS hydrogels were synthesized successfully and may be a potential material for biomedical, drug delivery, or absorption application. This study can provide a certain research basis and relevant theoretical basis for clinical practice. Graphical abstract
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 3
·1-8
·
IF 5.3
Yang Shuning,Tian Li,Song Guanying,Li Huiling,Li Chao,Wu Qian,Shan Xiangyu,Zhao Lun
An electrochemiluminescence (ECL) sensor for determining bisphenol A (BPA) was prepared based on titanium dioxide (TiO 2 ) and Co-MOF. TiO 2 is a co-reaction promoter that amplifies the ECL signal in the Ru(bpy) 3 2+ -trinpropylamine (TPrA) system. When the electrode is modified with Co-MOF the ECL signal is significantly enhanced. This is because Co-MOF can not only be used as a co-reaction accelerator but also as a carrier to adsorb more luminescent substances. Possible mechanisms for amplifying the original signal through the synergistic action of the two substances are investigated. The ECL strength decreases with increasing concentrations of BPA, and the amount of BPA can be determined by the change in ECL signal strength (Δ I ). Under optimal experimental conditions, the linear range of BPA was 2.0 × 10 −10 to 2.0 × 10 −5 M, with a determination limit of 6.7 × 10 −11 M (3 σ / m ). The relative standard deviation (RSD) of the signal for ten consecutive measurements was 1.5%. The sensor can be used to detect BPA in bottled samples with recoveries of 96 to 105%. Graphical
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IONICS
·
2024
·Vol. 30
·期 3
·1723-1733
·
IF 2.4
Zhao Ji-wei,Wei Zhi-qiang,Wang Can,Zhou Mei-pan,Lu Cheng-gong
The Co-based organic skeleton was combined with graphene oxide (GO) as a precursor, Ni 2+ hydrolysis etching was introduced, and finally, NiCo-LDH/GO was obtained. The final composite electrode material NiCo 2 S 4 /rGO was obtained by high-temperature vulcanization. The introduction of MOFs and rGO significantly increased the specific surface area of the material and made it have excellent electrochemical properties. The specific capacitance of the composite NiCo 2 S 4 /20rGO reaches an astonishing 272.5 mAh g −1 when the current density is 1 A g −1 . In addition, at a large current of 10 A g −1 , the specific capacitance of the material can also reach 139.5 mAh g −1 , and after a long cycle of 5000 cycles at such a current density, the capacity remains at the original 73.2%. With NiCo 2 S 4 /20rGO electrode material as the positive electrode and activated carbon as the negative electrode, the hybrid supercapacitor is assembled. At an energy density of 56.9 Wh kg −1 , its power density reaches an excellent 799 W kg −1 , and it still has a capacity retention rate of 74% at a current density of 10 A g −1 . The excellent properties of composites demonstrated in this work open up new possibilities for high-quality energy storage devices.
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TOPICS IN CATALYSIS
·
2022
·Vol. 66
·期 1
·12-21
·
IF 2.781
Zhong Cheng,Shang Zhichao,Zhao Caixian,Luo He’an,Cao Yi,Yan Dejian,You Kuiyi
In order to obtain a high photoelectrochemical performance, co-catalysts loading is the most commonly used way, which can facilitate reactions and suppress the charge recombination. In this paper, a novel composite of ZnO/Ti 3 C 2 T X photoanode was fabricated by a facile spin coating of precipitating Ti 3 C 2 T X (MXene) flakes onto the surface of ZnO, as co-catalyst for enhanced photoelectrochemical (PEC) water splitting. Under simulated sunlight, the optimum composite of ZnO/Ti 3 C 2 T X photoanode showed the photocurrent density as 1.2 mA cm −2 at 1.23 V RHE , which is 1.4 times higher than that of pristine ZnO without Ti 3 C 2 T X co-catalyst (0.83 mA cm −2 at 1.23 V RHE ). The ZnO/Ti 3 C 2 T X photoanode showed a photoconversion efficiency of 0.32% and maintained a stable photocurrent over 2000s. The Ti 3 C 2 T X (MXene) flakes as co-catalyst to promote the charge transfer and accelerates the reaction kinetics in ZnO/Ti 3 C 2 T X photoanode. This work delivers a two-dimensional (2D) material Ti 3 C 2 T X (MXene) as co-catalyst for enhanced ZnO photoanode PEC water splitting.
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Catalysts
·
2017
·Vol. 7
·期 4
·106
·
IF 3.082
Xiuling Zhang,Zhibin Zhan,Zhuang Li,Lanbo Di
High performance catalysts for carbon monoxide (CO) oxidation were obtained through thermal activation of a CuBTC (BTC: 1,3,5-benzenetricarboxylic acid) metal–organic framework (MOF) in various atmospheres. X-ray diffraction (XRD), X-ray photonelectron spectroscopy (XPS), N2adsorption–desorption measurement, and field emission scanning electron microscopy (FESEM) were adopted to characterize the catalysts. The results show that thermal activation by reductive H2may greatly destroy the structure of CuBTC. Inert Ar gas has a weak influence on the structure of CuBTC. Therefore, these two catalysts exhibit low CO oxidation activity. Activating with O2is effective for CuBTC catalysts, since active CuO species may be obtained due to the slight collapse of CuBTC structure. The highest activity is obtained when activating with CO reaction gas, since many pores and more effective Cu2O is formed during the thermal activation process. These results show that the structure and chemical state of coordinated metallic ions in MOFs are adjustable by controlling the activation conditions. This work provides an effective method for designing and fabricating high performance catalysts for CO oxidation based on MOFs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xu Liu,Jingzhe Li,Zewang Liu,Guang-zai Nong
The interfacial tuning of carbon materials is paramount to enhancing capacitive performance. Heteroatom doping significantly alters carbon materials' structural, electronic, and surface properties, improving their electronic conductivity and ion transport pathways. This process also introduces additional energy storage sites and improves structural stability to meet the requirements of advanced electrochemical energy storage systems. A N/Cl co-doped porous carbon material has been synthesised in this study. The material has a surface area of 1849.778 m 2 /g and a specific capacitance of up to 324 F/g at 0.5 A/g. Capacitance retention was as high as 89.69 % after 5000 cycles at 10 A/g. Furthermore, a symmetric supercapacitor based on BC121–800 exhibits an energy density of 11.6 Wh/Kg at a power density of 250.4 W/Kg. This study contributes novel strategies to enhance energy storage technologies.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Liying Zhang,Hanchen Wang,Zhenghan Cai,Feng Zhu,Biao Huang,Qi-Lin Lu
The construction of hierarchically porous carbon with a rational pore distribution using environmentally benign activators, while simultaneously incorporating heteroatom doping, is crucial for the preparation of electrode materials for supercapacitors. Here, a green one-step method has been developed that utilizes a biomass derivative, chitosan, as the matrix to construct a nitrogen-doped carbon framework, with polyethyleneimine (PEI) for synergistic nitrogen doping and hydrogen bonding interactions to optimize the carbon framework. Phytic acid (PA) is employed as a phosphorus source, activator, and crosslinker to build hierarchical porous carbon containing phosphorus doping, while carboxylated nanocellulose (CNC) is introduced to regulate the uniformity of the pore structure. The resulting HPC exhibits a specific surface area of 939.87 m²/g, a total pore volume of 0.45 cm³ /g, and a high specific capacitance of 350 F/g at a current density of 1 A/g. Furthermore, the HPC supercapacitor assembled at this current density demonstrates an energy density of 18.3 Wh/kg at a power density of 450 W/kg, with a capacitance retention rate of 86 % and a coulombic efficiency of 97 % after 10,000 cycles. Therefore, the approach in this study, which involves the use of PA to activate carbon precursors while incorporating heteroatom doping and adding CNC to promote uniform heteroatom doping, provides valuable insights for the facile, efficient, and green synthesis of biomass-based porous carbon materials, and contributes to energy storage applications.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lin Li,Jiawei Zhao,Shaohua Luo,Pengyue Xing,Xinglong Teng,Zhenzhu Cao,Guorong Li
Materials with colossal permittivity (CP) have been extensively investigated for their promising applications in energy storage devices. In this work, the composition, microstructure and dielectric properties of (Na 0.25 Ta 0.75 ) x Ti 1–x O 2 (x = 0–0.04) ceramics were systematically investigated. Co-doped TiO 2 ceramics demonstrated giant dielectric constants. The optimized dielectric properties were achieved in (Na 0.25 Ta 0.75 ) 0.02 Ti 0.98 O 2 with high dielectric constant (7.32 × 10 4 ) and low loss (0.034) at 1 kHz. The origin of CP was explored by dielectric, complex impedance spectroscopy and X-ray photoelectron spectroscopy measurements. The giant dielectric constant primarily stems from the electronic pinning defect dipole effect and the internal barrier layer capacitance effect. This finding might shed light on the design of high-performance giant dielectric materials.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-11
·
IF 2.8
Wang Qun,Bu Ranran,Xu Changyuan,Zhao Fengjiao,Yin Hongming
Tellurite glass samples doped with Er 3+ and Eu 3+ were synthesized by the high-temperature solid phase method. The XRD diffraction pattern shows the amorphous properties of the prepared samples. The luminescence properties of glass samples were analyzed using the absorption spectrum, excitation spectrum, and emission spectrum. The energy transfer mechanism between Er 3+ ions and Eu 3+ ions was studied by changing the concentration of Eu 3+ ions, and the results were verified by measuring the luminescence decay lifetime. It is worth noting that at 380 nm excitation, Er 3+ and Eu 3+ co-doped tellurite glass exhibits remarkable tunable luminescence characteristics: by adjusting the concentration of Eu 3+ ions, the emission color can be flexibly adjusted from green to orangish-red. In addition, by effectively combining the prepared co-doped glass sample with the 380 nm GaN chip, the cold white light emission with CIE coordinates of (0.324, 0.320) was successfully achieved. According to the variable-temperature spectroscopy, at 210℃, the emission peak intensities of the co-doped Er 3+ /Eu 3+ tellurite glass at 547 nm and 613 nm are above 70% of the room-temperature luminescence intensity, demonstrating excellent thermal stability. Graphical
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WATER RESEARCH
·
2024
·
IF 11.4
Zhenyu Wang,Yu Kong,Xuesong Cao,Ning Liu,Chuanxi Wang,Xiaona Li,Baoshan Xing
Heteroaggregation between nanoplastics (NPs) and titanium dioxide nanoparticles (TiO 2 NPs) determines their environmental fates and ecological risks in aquatic environments. However, the co-photoaging scenario of NPs and TiO 2 NPs, interaction mechanisms of TiO 2 NPs with (aged) NPs, as well as the dependence of their heteroaggregation on TiO 2 NPs facets remain elusive. We found the critical coagulation concentration (CCC) of polystyrene nanoplastics (PSNPs) with coexisting RTiO 2 NPs was 1.9 − 2.2 times larger than that with coexisting ATiO 2 NPs, suggesting a better suspension stability of PSNPs+RTiO 2 NPs. In addition, CCC of TiO 2 NPs with coexisting photoaged PSNPs (APSNPs) was larger 1.7 − 2.2 times than that with PSNPs coexisting, indicating photoaging inhibited their heteroaggregation due to increasing electrostatic repulsion derived from increased negative charges on APSNPs and the polymer-derived dissolved organic carbon. Coexisted TiO 2 NPs promoted oxidation of PSNPs with the action of HO· and O 2 ·– under UV light, leading to inhibited heteroaggregation. Moreover, Van der Waals and Lewis-acid interaction dominated the formation of primary heteroaggregates of PSNPs-TiO 2 NPs (E SE = ‒2.20 ∼ ‒2.78 eV) and APSNPs-TiO 2 NPs (E SE = ‒3.29 ∼ ‒3.67 eV), respectively. The findings provide a mechanistic insight into the environmental process of NPs and TiO 2 NPs, and are significant for better understanding their environmental risks in aquatic environments.
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PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 2
·582-588
·
IF 1.1
Zhang Mengyi,Cheng Zhengzai,Yang Mian,Yu Qianwen,Tan Zhiping,Wandji Djouonkep Lesly Dasilva,Cheng Junpeng,Liu Panpan,Ding Ling,Gauthier Mario
High molecular weight poly(1,4-butylene 2,5-furandicarboxylate-co-isosorbide 2,5-furandicarboxylate) copolyesters (PBSIF- x ) were synthesized via melt-polycondensation of 2,5-furandicarboxylic acid (FDCA), with varying ratios of isosorbide (ISB) and 1,4-butylene glycol (BDO) catalyzed by antimony trioxide (Sb 2 O 3 ). The PBSIF -x structures were investigated using FTIR and 1 H NMR, while the GPC analysis exhibited the copolyesters molecular weights with number average molecular mass ( M n ) in the range of 11 079–15 153 g/mol. The DSC results show that PBSIF- x copolyesters have a single glass-transition temperature ( T g ) (77.45–110.96 °C), increasing with the increase in ISB content, while TGA analysis demonstrates excellent thermal stability up to 320 °C. From the thermal result, properties of PBSIF- x copolyesters are found to be within the interval of their parent homologues poly(butylene 2,5-furandicarboxylate) (PBF) and poly(isosorbide 2,5-furandicarboxylate) (PIF), which confirms the aromatic/aliphatic blending within the polymer matrix for enhanced polymer stability and performance.
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