Materials
·
2024
·Vol. 17
·期 11
·2706
·
IF 3.1
Yingzhe Du,Lili Li,Yukun Yuan,Yufaning Yin,Genggeng Dai,Yaqing Ren,Shiying Li,Peng Lin
Throughout the nuclear power production process, the disposal of radioactive waste has consistently raised concerns about environmental safety. When the metal tanks used for waste disposal are corroded, radionuclides seep into the groundwater environment and eventually into the biosphere, causing significant damage to the environment. Hence, investigating the adsorption behavior of radionuclides on the corrosion products of metal tanks used for waste disposal is an essential component of safety and evaluation protocols at disposal sites. In order to understand the adsorption behavior of important radionuclides60Co,59Ni,90Sr,135Cs and129I on α-FeOOH, the influences of different pH values, contact time, temperature and ion concentration on the adsorption rate were studied. The adsorption mechanism was also discussed. It was revealed that the adsorption of key nuclides onto α-FeOOH is significantly influenced by both pH and temperature. This change in surface charge corresponds to alterations in the morphology of nuclide ions within the system, subsequently impacting the adsorption efficiency. Sodium ions (Na+) and chlorate ions (ClO3−) compete for coordination with nuclide ions, thereby exerting an additional influence on the adsorption process. The XPS analysis results demonstrate the formation of an internal coordination bond (Ni–O bond) between Ni2+and iron oxide, which is adsorbed onto α-FeOOH.
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MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-12
·
IF 5.3
Hou Linqian,Wei Jinya,Xiang Chen,Yang Dezhi,Yang Yaling
A novel copper and iron doped containing chitosan and heparin sodium carbon dots (CS-Cu,Fe/HS) nanozyme was formulated through a single-step microwave digestion method. CS-Cu,Fe/HS exhibits excellent peroxidase (POD)-like activity and positive charge characteristics, and it can oxidize the negatively charged 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) in the presence of H 2 O 2 to produce a green compound (ox-ABTS). Furthermore, CS-Cu,Fe/HS enhances electron transfer and provides additional active sites through the valence state transformations of Fe 2+ /Fe 3+ and Cu 2+ /Cu + . Interestingly, the POD-like activity of CS-Cu,Fe/HS is inhibited with the introduction of ampicillin (AMP), which may be because the Cu and Fe ions in CS-Cu,Fe/HS form complexes with AMP, leading to changes in the structure or surface properties of the nanozyme, thereby reducing the number of active sites on the nanozyme. Drawing from this, a straightforward and reliable colorimetric sensor was constructed for AMP detection, featuring a linear range of 0.033 to 110 μg/mL and a detection limit as low as 11.6 ng/mL. The proposed detection method for AMP performed well in real samples, with recoveries ranging from 94.8% to 110.2%. Graphical abstract
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jintao Liang,Qing Huang,Liang Wu,Xiaohang Shi,Kaiteng Yan,Fei Guo,Zhide Zhou,Guiyin Li
Glucose (Glu) is an important source of energy and metabolic intermediate for animal and plant cells. In this study, a high-performance biosensor for specific detection of Glu was constructed by combining a light-addressable potentiometric biosensor (LAPS) and a specific sensitive unit. The specific sensitive unit was adopted a silicon-based capacitive structure, and the glucose oxidase/reduced graphene oxide -chitosan-ferrooxidase/gold nanoparticles (GOX/RGO-CS-Fc/AuNPs) was modified onto the silicon-based working electrode to construct an nanosensing membrane. The interaction between the specific sensitive unit and Glu resulted in the formation of a bilayer potential, and the field effect generated by the bilayer potential caused a change in the capacitance of the silicon structure, which resulted in a change in the photocurrent-voltage characteristics of the LAPS. Through the potential shift in the photocurrent-voltage characteristics, the LAPS was capable of detection the concentration of Glu. Under optimal conditions, the potential shift was linearly correlated with the Glu concentration from 0.01 mg/mL to 4.00 mg/mL with R 2 of 0.9821, and the limited detection was 0.001 mg/mL. In addition, the LAPS showed good recovery (97.92 %–105.72 %), admirable specificity and stability in detection Glu in human serum samples.
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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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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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zizhan Guo,Jingru Zhang,Ming Jiang,Guoqiang Peng,Li Hua,Jiayue Dong,Fengfeng Jia,Zhigang Xia,Zhiwen Jin,Zhaoqing Lu
X-ray equipment often needs to be used in complex and variable environments. Combining X-ray shielding materials with pressure sensing capabilities can ensure that the equipment effectively shields X-rays while under pressure, safeguarding operational safety. In this study, the Janus structure was designed to be equipped with high shielding performances and intelligence for Cs-Pb-Br systems perovskite (Cs-Pb-Br)/MXene/aramid nanofiber (ANF) composites. In Cs-Pb-Br/MXene/ANF Janus film, the rational longitudinal distribution of Cs-Pb-Br originated from Janus structure and the internal reflection originated from layered MXene significantly enhance the X-ray shielding performances. Kill two birds with one stone, the layered MXene in Janus structure endows film with sensitive mechanical sensing properties. The attenuation efficiency and mass attenuation coefficient of Cs-Pb-Br/MXene/ANF Janus film were 70.5–83.2 % and 83.2–121.5 cm 2 /g under a continuous X-ray generated from a tungsten target with applied voltage ranging from 20 kV to 70 kV. The Janus film demonstrated ideal strain sensing performance, lightweight (0.96 cm 2 /g), robust tensile stress (25.5 MPa), and excellent flexibility, laying a foundation for producing next generation of X-ray shielding materials, which are light, flexible and intelligent.
研究领域:
材料科学
·
纳米技术
·
辐射屏蔽
·
柔性电子学
·
传感器
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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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Tingxiang He,Xiang Liu,Shenghua Lv,Dequan Wei,Leipeng Liu
The abuse of antibiotics led to significant environmental pollution through persistent residues in water bodies, posing severe risks to both ecological systems and human health. Addressing this issue, recent studies highlighted the potential of carbonaceous materials as effective adsorbents for removing antibiotics from water. Despite the proven potential of various carbonaceous materials in water purification, the application of three-dimensional porous microspherical aerogels as adsorbents presented a promising yet comparatively less discussed avenue in the quest for efficient antibiotic removal from aquatic environments.This work introduced a novel KGM-GO/CS/SA composite aerogel sphere, developed via a simple sol–gel and dripping method, using konjac glucomannan (KGM) as a cross-linking agent. We extensively analyzed its adsorption efficiency against common antibiotics such as tetracycline (TC), ofloxacin (OFL), and sulfadiazine (SDZ), revealing its rapid adsorption kinetics and high capacity. The aerogel's micro-morphology, characterized by a graded porous structure with abundant microporous channels and a low bulk density of 21.2 mg/cm3, along with its enhanced mechanical properties and thermal stability due to KGM cross-linking, signified its potential as a robust adsorbent. The surface functional groups facilitated diverse interaction mechanisms, including electrostatic attraction, hydrogen bonding, and π-π interactions, contributing to the adsorbent's high performance. Furthermore, the surface charge of the aerogel varied with pH, enhancing its electrostatic adsorption capabilities. The adsorption behavior was best described by the quasi-second-order and Langmuir models, with maximum capacities of 427.63 mg/g for OFL, 374.35 mg/g for TC, and 231.09 mg/g for SDZ, thereby offering a promising solution for antibiotic pollution remediation and illustrating the utility of carbon-based aerogel microspheres in environmental applications.
研究领域:
材料科学
·
环境科学
·
生物医学工程
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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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