JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Tian Duan,Wang Zhe,Zhang Jiaqian,Luo Ying,Zhang Zhenlong,Li Chao,Ye Kai,Peng Chaoliang,Chen Yiming,Lin Wenxue,Zhang Jingyan
This study examines attapulgite-bentonite-pyrite (AB 7 Fe) and zeolite-bentonite-pyrite (ZB 7 Fe) mixtures as buffer and backfill materials for nuclide migration using soil column experiments and COMSOL modeling. The results indicated that ZB 7 Fe possessed higher adsorption capacities for cesium (Cs) and strontium (Sr) compared to AB 7 Fe. Conversely, AB 7 Fe demonstrated superior retardation performance, more effectively slowing nuclide migration. After 1000 years, Cs and Sr concentrations in AB 7 Fe surpassed those in ZB 7 Fe. Additionally, nuclide migration increased with higher initiation pressure, dispersion, and diffusion coefficients. This research is crucial for improving the long-term safety of nuclear waste repositories.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Qi Li,Senlin Deng,Junyang Liu,Tingting Yan,Jinguo Hao,Gang Wang,Guoliang Zhang,Jie Li,Chunshan Li
The dispersion of active sites plays an imperative role in the promotion of catalytic performance on methyl acrylate synthesis via direct vaporous aldol condensation. Herein, a novel PEG-assisted impregnation method was proposed to synthesize Cs/Zr-SiO 2 catalyst with high dispersion of acid and base sites. A series of characterization techniques including NMR, TEM, physical N 2 adsorption isotherms, XRD, XPS, NH 3 -/CO 2 -TPD, and Py-IR were used to investigate the physico-chemical properties of these prepared catalyst series. The introduction of PEG improved the specific surface area, dispersion of active sites, and density of acid and base sites, resulting in superior catalytic performance of Cs/PEG@Zr-SiO 2 by comparison with that of Cs/SiO 2 and Cs/Zr-SiO 2 . The kinetic experiments revealed that the activation energy of aldol condensation was 80.8 kJ/mol over the Cs/PEG@Zr-SiO 2 catalyst. The deactivation behavior derived from carbon deposition was discovered, and the spent catalyst could be regenerated by simple thermal treatment.
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Catalysts
·
2025
·Vol. 15
·期 7
·694
·
IF 4
Ziyan Mi,Huayun Long,Yuhua Jia,Yue Ma,Cuilan Miao,Yan Xie,Xiaomei Zhu,Jiahui Huang
The development of non-noble metal catalysts for gas-phase propylene epoxidation with H2/O2remains challenging due to their inadequate activity and stability. Herein, we report a Cs+-modified Ni/TS-1 catalyst (9%Ni-Cs/TS-1), which exhibits unprecedented catalytic performance, giving a state-of-the-art PO formation rate of 382.9 gPO·kgcat−1·h−1with 87.8% selectivity at 200 °C. The catalyst stability was sustainable for 150 h, far surpassing reported Ni-based catalysts. Ni/TS-1 exhibited low catalytic activity. However, the Cs modification significantly enhanced the performance of Ni/TS-1. Furthermore, the intrinsic reason for the enhanced performance was elucidated by multiple techniques such as XPS, N2physisorption, TEM,29Si NMR, NH3-TPD-MS, UV–vis, and so on. The findings indicated that the incorporation of Cs+markedly boosted the reduction of Ni, enhanced Ni0formation, strengthened Ni-Ti interactions, reduced acid sites to inhibit PO isomerization, improved the dispersion of Ni nanoparticles, reduced particle size, and improved the hydrophobicity of Ni/TS-1 to facilitate propylene adsorption/PO desorption. The 9%Ni-Cs/TS-1 catalyst demonstrated exceptional performance characterized by a low cost, high activity, and long-term stability, offering a viable alternative to Au-based systems.
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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 45
·455703
·
IF 2.8
Shuangqi Dong,Yuge Feng,Chao Wang,Zhaopeng Huang,Ajit Khosla,Hui Zhang
As a transition-metal oxide semiconductor with variable tungsten valence states and abundant oxygen vacancies, WO3−x has attracted broad interest because its localized surface plasmon resonance performance can be tuned via controlling the concentration of oxygen vacancies. In this work, Cs-doped WO3−x nanosheets (Cs-WO3−x) were synthesized by solvothermal method. Subsequently, Cs-WO3−x were further annealed in hydrogen and air atmosphere, respectively, forming a compact, highly crystalline surface layer (with thickness of ∼14 nm) on the surface while retaining abundant oxygen vacancy defects in the center region (denoted as a-Cs-WO3−x). As a proof-of-concept, the as-prepared nanosheets were employed as light harvesting materials in photocatalytic degradation of methyl orange (MO), a-Cs-WO3−x nanosheets demonstrate significantly improved degradation efficiency with respect to WO3−x and Cs-WO3−x counterparts. The enhanced performance can be attributed to the hot-carrier transfer routes, which relies on not only direct electron transfer but also the more efficient plasmon-induced resonant energy transfer pathway. This work develops new pathway and provides important insights into the regulation of oxygen vacancies.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Lijun Meng,Lihan Liu,Senjian Han,Xuan Zhou,Jiayi Luan,Lina Xu,Shiqiang Wang,Tianlong Deng
Immobilization of metal ferrocyanides (MFCs) on the surface of substrate is supposed to be an efficient method for selectively removing cesium ions. In this study, the high adsorption performance of modified polyacrylonitrile membrane for Cs removal was fabricated by incorporating copper ferrocyanide (CuFC) nanoparticle via in situ acid-base reaction of carboxylated polyacrylonitrile (CPAN) and Cu(OH) 2 during the phase inversion process. Simultaneously, the induced coprecipitation reaction caused the uniformly embedded CuFC throughout the substrate of CPAN. The obtained CuFC-CPAN showed a preferred adsorption capacity of 331.65 mg g −1 and favorable selectivity in the presence of numerous coexisting ions. The experimental validation and characterizations suggested the adsorption mechanism was mainly ion exchange with a fraction of electrostatic attraction. The high pH stability and reusability make the CuFC-CPAN membrane a reliable choice for efficient Cs removal.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Chentong Zou,Kai Chen,Shikang Zheng,Mingjun Zhang,Yuyan Liu,Ziyi Ma,Lin Wang,Zhaoyi Jin,Yiyi Cheng,Junkai Zhang,Xinzhe Xu,Guanyu Li,Guomin Wu
As the largest organ interfacing directly with the external environment, skin is highly vulnerable to injuries from trauma (e.g., vehicular accidents, lacerations, burns) or surgical resection. The healing of such defects is frequently protracted and susceptible to microbial infection, which exacerbates recovery timelines. Bioelectric signaling has emerged as a critical modulator of wound repair processes. Concurrently, decades of antibiotic misuse have precipitated widespread bacterial resistance, with biofilm formation further complicating therapeutic efficacy. Consequently, developing safe and effective antimicrobial strategies to shield wounds against drug-resistant pathogens is imperative. Metallic nanoparticles, notably zinc oxide nanoparticles (ZnO-NPs), have garnered significant attention for their potent antibacterial properties. To utilize this advantage, we prepared a piezoelectric nanofibrous membrane via electrospinning. This membrane integrates polyvinylidene fluoride (PVDF) for piezoelectricity, ZnO-NPs for antimicrobial activity, and chitosan (CS) for hemostatic and supplementary antibacterial functions. Bioelectric stimulation was achieved through dual mechanisms: exogenous low-intensity pulsed ultrasound (LIPUS) and endogenous mechanical motion from the rat model. The resulting ZnO@PVDF/CS membrane exhibited excellent material properties, strong antimicrobial efficacy, and accelerated in vivo wound healing in rat models.
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Nanoscience and Nanotechnology Letters
·
2017
·Vol. 9
·期 11
·1700-1707
·
IF 1.889
Zou Jiao,Huang Lele,Jiang Xinyu,Jiao Feipeng,Yu Jingang
A novel chiral electrochemical sensor was fabricated and used for recognition of tryptophan (Trp) enantiomers. Graphene oxide (GO) was prepared by the modified Hummers' method. Moreover, the suspensions/solutions of GO, bovine serum albumin (BSA) and chitosan (CS) in deionized-distilled
water were coated onto the surface of GCE by a layer-by-layer drop method, and the novel triple layered GO/BSA/CS composite modified glassy carbon electrode (GO/BSA/CS/GCE) was fabricated. The electrochemical recognition and quantification of the Trp enantiomers on the GO/BSA/CS/GCE
were performed using differential pulse voltammetry (DPV). The Trp monomer concentrations exhibited a good linear relationship with the peak current values. The GO/BSA/CS/GCE exhibited good coefficients of determination (R
2
D-Trp
= 0.98917 and R
2
L-Trp
= 0.94824) for D- and L-Trp enantiomers in the concentration range of 1 to 8 mM, respectively. The GO/BSA/CS/GCE fabricated in this study exhibited superior recognition performance, good oxidation potential and current response signals for D- and L-Trp. The novel GO/BSA/CS/GCE
fabricated in this study exhibited potential to be used as a convenient, fast and efficient chiral electrochemical sensor for qualitative and quantitative determination of Trp enantiomers.
研究领域:
分析化学
·
生物化学
·
电化学传感器
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JOURNAL OF THE TEXTILE INSTITUTE
·
2025
·
IF 1.5
Zhiyuan Chen,Binjie Xin
During the wound healing process, the surrounding tissue fluid plays a crucial role. However, excessive exudate can lead to wound infection and over-hydration, thereby delaying the healing process. Therefore, developing a novel wound dressing that can unidirectionally remove excess biological fluids and effectively inhibit bacterial infection is particularly important. This study successfully utilized electrospinning technology to prepare a nanofiber dual-layer membrane with unidirectional water transport functionality. Its inner layer consists of polylactic acid (PLA) and zinc oxide (ZnO) nanofibers, providing excellent hydrophobic and antibacterial properties. The outer layer is composed of polyvinyl alcohol (PVA), chitosan (CS), and nanoscale zinc oxide (ZnO) nanofibers, offering outstanding hydrophilicity and liquid absorption capability. Experimental results demonstrate that this nanofiber dual-layer membrane exhibits outstanding physical, chemical, and biological properties, with a mechanical strength of up to 6.4 Mpa and breathability 17.47 mm/s and antibacterial property is outstanding. In practical applications, this dressing can effectively expel excess biological fluids within just 5 s, preventing wound over-hydration and providing an innovative and feasible solution for the effective treatment of chronic wounds.
研究领域:
生物材料
·
组织工程
·
纳米医学
·
创伤修复
·
感染控制
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 30
·9203-9210
·
IF 6.641
Y. Y. Zhou,E. H. Song,M. G. Brik,Y. J. Wang,T. Hu,Z. G. Xia,Q. Y. Zhang
Mn4+-doped fluoride red-emitting phosphors have been developed for backlighting white light-emitting diodes (WLEDs). However, the long fluorescence lifetime (τ > 5 ms) leads to the image-retention phenomenon for the human eye when Mn4+ is doped into equivalent X sites in A2XF6 (A = Na, K, Rb, Cs; X = Si, Ge, Ti, Zr). Herein, we report on novel red-emitting A2NaScF6:Mn4+ (A = K, Rb, Cs) (ANSF) phosphors with short fluorescence lifetimes (τ < 4 ms) and characteristic zero phonon line (ZPL) emission, which can be realized via non-equivalent doping of Mn4+ into Sc3+ sites. Density functional theory (DFT) calculations verified the formation of a slightly distorted environment of Mn4+ and an Na+ vacancy to balance the charge with Mn4+ non-equivalent doping. The WLED backlight using ANSF as a red-light component can reach a wide color gamut above 105% of the National Television Standards Committee (NTSC) standard, and the image-retention on the backlighted screen can be effectively avoided compared to the backlight obtained using commercial K2SiF6:Mn4+. Such a Mn4+ non-equivalent doping strategy opens a new perspective for the modification of local symmetry and enhancement of the luminescence properties of Mn4+-doped red-emitting fluoride phosphors.
研究领域:
材料科学
·
光学工程
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RSC Advances
·
2015
·Vol. 5
·期 41
·32826-32834
·
IF 3.84
Yanan Wang,Xuewei Lang,Guoqing Zhao,Huanhui Chen,Yiwei Fan,Linqing Yu,Xiuxiu Ma,Zhirong Zhu
A variety of cesium supported catalysts with amorphous SiO2 as a carrier were prepared by vacuum impregnation and ultrasonic impregnation methods, which were used for the synthesis of methyl acrylate by aldol condensation of methyl acetate and formaldehyde. The as-prepared catalysts were characterized by XRD, N2 adsorption–desorption, NH3-TPD, CO2-TPD, XPS, ICP and TG. The results indicated that the bifunctional Cs–La–Sb/SiO2 showed a high conversion of methyl acetate as well as a high yield of methyl acrylate, which was attributed to the weak acid–base sites and the formation of basic Cs–O–Si species with the addition of antimony and lanthanum, respectively. Furthermore, Cs–La–Sb/SiO2-(V) prepared by vacuum impregnation showed a high initial catalytic activity, but its activity sharply decreased due to the loss of active species. Comparatively, Cs–La–Sb/SiO2-(U) prepared by ultrasonic impregnation showed a good stability owing to the cavitation effect of ultrasonic waves. The conversion of methyl acetate and yield of methyl acrylate remained above 20% and 9.0% (based on methyl acetate) for 100 h without obvious deactivation. Moreover, carbon deposition was the main factor for the deactivation of Cs–La–Sb/SiO2-(U), and the coked catalyst could be regenerated by calcination in air.
研究领域:
催化化学
·
材料科学
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LANGMUIR
·
2026
·
IF 4.4
Zhihai Wu,Gongxuan Lu
The highly efficient enrichment of Li+ and Cs+ from their low-concentration aqueous solutions is a crucial step for Lithium and Cesium clean production, as well as radioactive Cs+ safety remediation from water. The current adsorption and precipitation routes are high energy cost and environmental unfriendly. Electrochemical ion exchange route may serve as a promising alternative route. This study presents results of high efficient, multicycle Li+ and Cs+ enrichment from their low concentration solutions via intercalation and deintercalation in WO3/GaAs composite electrode with Faraday efficiency above 99% and high intercalation capacities 7.25 mg/g for Li+ and 38.89 mg/g for Cs+, respectively. After six cycles, 95 and 90% capacities for Li+ and Cs+ still remained. Both enrichment efficiency and stability are higher than those of LiFePO4 (LFP) and LiMn2O4 (LMO) under the same conditions. This route might provide a way for low-energy cost and highly efficient Li+ and Cs+ recovery from contaminated water.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Xiaoye Wen,Chenjie Pang,Chenxi Dai,Zhefeng,Fan
As novel energy level-tunable photocatalysts, copper nanoclusters (CuNCs) have been used for combining with conventional catalysts to synergize enhanced the catalytic capabilities. However, conventional photocatalysts have their own drawbacks. In particular, their fixed energy levels are unfavorable for regulating the energy level structure of composite catalysts. In this study, a novel nanoplatform (CuNCs@CS/MOF) was constructed for the detection and photocatalytic degradation of MBT. The chitosan-modified CuNCs were encapsulated within the MOF matrix. The CuNCs maintained an aggregated state and the rotation of their ligands was restricted, thereby further enhancing the photoluminescence intensity and photostability of CuNCs. When exposed to light irradiation, CuNCs@CS/MOF showed remarkable photocatalytic activity, and the underlying mechanism governing the photocatalytic degradation process was elaborated in detail. Specifically, CuNCs@CS/MOF generated photogenerated electrons and holes, the photogenerated electrons reacted with H 2 O 2 to produce ·OH, while the remaining holes accepted electrons donated by MBT. The generated ROS oxidized TMB to oxidized TMB (oxTMB) under light irradiation, which was thereafter diminished by MBT. On this basis, the quantitative detection of MBT was established. Furthermore, ROS could oxidize and decompose MBT into small-molecule fragments, thus achieving the efficient elimination of MBT. This work provides an attractive strategy for designing multifunctional novel nanoplatform, which can be applied for the accurate detection and further harmless treatment of pollutants.
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