TALANTA
·
2023
·
IF 6.1
Xiao Tian,Lei Zhao
Concentrations of trace elements in coal and coal combustion products are commonly analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) due to large number of elements detected and the relatively the low detection limits of this technique. Like other geological samples, complete dissolution of coal and coal combustion products is also essential for accurate ICP-MS results. In this study, Sr and Ba in coal and coal combustion products (fly and bottom ashes) from two coal-combustion power plants from North China analyzed by XRF and ICP-MS were comparatively studied. The concentrations of Sr and Ba analyzed by ICP-MS, when a mixture of acids (2 ml HF + 5 ml HNO 3 for each 50 mg coal sample and 5 ml HF + 2 ml HNO 3 for each 50 mg ash sample) was used for microwave-assisted digestion, do not fit well with the their relative XRF results. This is most probably due to the formation of the fluorides during microwave digestion, and this assumption is supported by the presence of various fluoride compounds, NaMgAl(F, OH) 6 ·H 2 O, NH 4 MgAlF 6 , AlF 3 , and K 2 SiF 6 , in the residues of all the coal and ash samples in our sequential extraction experiment. Cations of Sr and Ba were probably trapped into the divalent cation sites of the fluorides. Concentrations of Sr and Ba analyzed by ICP-MS using increased HF and HF/HNO 3 ratio (7 ml HF and 2 ml HNO 3 for each 50 mg coal/ash sample) are in better agreement with the XRF results. Our results indicate that excess amount of HF probably has led to the suppression of these elements due to fluoride precipitation. The results indicate that the modified digestion method is capable of achieving complete digestion of coal samples and results in a reliable analysis of Sr and Ba concentrations in coal samples and most fly ashes by ICP-MS. However, the formation of insoluble fluorides is probably not completely suppressed for some bottom ash samples, which can result in underestimation of Sr and Ba concentrations. Nevertheless, XRF analysis can serve as a reliable cross-check method to assist in the evaluation of the accuracy of ICP-MS results.
研究领域:
环境科学
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分析化学
·
地球化学
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DOI
PubMed
高影响因子
SOLAR ENERGY
·
2018
·
IF 4.374
Huajun Chen,Wenjie Tian,Wuxiu Ding
Metallic sliver-doped mesoporous Al 2 O 3 fibers (meso-Ag/Al 2 O 3 ) that can harvest visible light to speed up solar water purification, were synthesized by one-pot hydrothermal method. Insightful analyses of XRD, XRF and XPS of meso-Ag/ Al 2 O 3 verified that metallic silver occupied interstitial positions of Al 2 O 3 lattice forming interstitial solid solution. N 2 adsorption/desorption illustrated that meso-Ag/Al 2 O 3 exhibited significantly increases in the specific surface area, pore volume and average pore diameter after doping with silver. The UV–Vis diffuse reflectance spectra and disinfection performance indicated that meso-Ag/Al 2 O 3 can harvest visible light to promote the conversion of dioxygen to ROS for water disinfection compared with the widely used TiO 2 . With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 120 min with a small amount of material (8 mg/L) under simulated visible light.
研究领域:
环境科学
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材料科学
·
水处理
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Lin Li,Yan Xu,Guanyu Lan,Zhenzhen Yao,Xiaoqin Chen,Mengyu Liu,Hongwei Shi,Xue Li,Xuefei Mao
Background Rapid and sensitive on-site detection of mercury in soil is crucial for environmental monitoring, however, current methods generally involve lengthy and complex sample digestion procedures thereby hindering true field deployment. While portable energy-dispersive X-ray fluorescence spectrometry (ED-XRF) offers field compatibility, which is often limited by insufficient sensitivity and spectral interference. Consequently, an effective pre-concentration method to enhance sensitivity and accuracy for rapid soil Hg analysis remains a significant challenge. Results A rapid field method for soil mercury analysis was developed by coupling a portable ED-XRF with a novel silver nanoparticle sponge trap. The trap was fabricated by functionalizing a melamine sponge with polyethyleneimine and dopamine, followed by in situ reduction of silver nitrate to form a three-dimensional porous structure capable of efficiently capturing gaseous Hg 0 through amalgamation. A major advantage is the clear separation between the characteristic XRF peaks of Ag and Hg, which minimizes spectral interference and ensures accurate quantification. The method achieved a detection limit of 12 ng/g, excellent linearity ( r > 0.996), and recoveries of 86-111%. Without any digestion, the entire analysis can be completed within 10 min, demonstrating strong potential for fast on-site application. Significance This work introduces a digestion-free, field-deployable strategy that overcomes the sensitivity and interference constraints of portable XRF in Hg detection. By integrating a tailored nanomaterial trap, it establishes a rapid and efficient framework for on-site environmental Hg monitoring.
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Tao Wu,Xuewen Gao,Jiaxing Feng,Yuan Jin,Zhengye Feng
Accurate predictions of the distribution coefficient ( K d ) and effective diffusion coefficient ( D e ) of radionuclides in bentonite barriers is critical for the safety evaluation of high-level radioactive waste repositories. Clay properties have a crucial impact on both parameters. However, existing models do not adequately capture the complex physicochemical characteristics of clay minerals, thereby limiting their prediction accuracy. This study developed, a variational autoencoder-multi-task deep learning (VAE-MTDL) framework to improve the predictive accuracy for K d and D e by integrating radionuclide diffusion data with X-ray fluorescence (XRF), X-ray diffraction (XRD), and cation exchange capacity (CEC) data. The model was trained using a dataset comprising 1159 experimental instances and 49 input features. It achieved high predictive accuracy (R 2 = 0.96 for Kd and 0.93 for D e ). Shapley additive explanations (SHAP) analysis identified total porosity as the most influential predictor, while XRF and XRD data significantly contributed to the predictions. Experimental validation using through-diffusion tests for HCrO 4 − (as a surrogate for monovalent anionic radionuclide species) and metal-EDTA complexes (including Eu(III), Sm(III), Ce(III), and Co(II) as a surrogate for di- and trivalent cationic radionuclide species) in compacted bentonite-sand mixtures confirmed robust generalization, with predicted-to-experimental ratios ranging from 1/5 to 5 for K d , and from 1/3 to 3 for D e . The enhanced accuracies in K d and D e predictions have practical relevance in advancing the safety evaluation of repositories.
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DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
·
IF 4.6
Jian Xiao,A.-Lin Xia,Tao Geng
In order to accurately quantify the content of light elements in food samples, a method based on portable energy dispersive X-ray fluorescence (p-XRF) technology combined with second-order calibration algorithm was proposed to simultaneously quantify phosphorus (P), sulfur (S), potassium (K) and calcium (Ca) in different food samples. Firstly, the XRF response signal matrix of each food sample was obtained by changing the test current and voltage. Secondly, the alternating penalty trilinear decomposition (APTLD) algorithm was used to analyze the three-way data array stacked by multiple samples. The results showed that second-order calibration algorithm could accurately extract the spectral signal of the target element even if there were serious background interference and signal overlap. The predicted recovery rates of the target elements in the food samples are 82 %–119 %. The LOD and LOQ of P, S, K, and Ca are 3, 3, 20, 8 ppm and 9, 11, 68, 26 ppm, which proves that this method can accurately quantify light elements in food samples. This study demonstrated that p-XRF combined with second-order calibration is an effective method for the determination of light elements in food and has broad practical application prospects.
研究领域:
食品科学
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分析化学
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产品关联
DOI
高影响因子
FUEL
·
2015
·
IF 3.52
Haimei Xu,Zhichao Miao,Huahua Zhao,Jian Yang,Jun Zhao,Huanling Song,Ning Liang,Lingjun Chou
In this paper, a series of ordered mesoporous zirconium oxophosphate with different P/Zr molar ratios (M-ZrPO- x ) were prepared via one-pot evaporation induced self-assembly strategy (EISA). The catalytic performance of M-ZrPO- x for the dehydration reaction of fructose to produce 5-hydroxymethylfurfural (5-HMF) was also studied. With high concentration of Brönsted and Lewis acid sites measured through NH 3 -TPD and pyridine-IR, M-ZrPO-0.75 performed high catalytic activity (up to 97.4%) and selectivity (79.6%) of 5-HMF under relatively mild conditions. Furthermore, M-ZrPO-0.75 performed excellent catalytic stability. Based on detailed analyses of XRD, SEM, TEM, BET and XRF, the structural, surface and textural properties of M-ZrPO-0.75 after reaction were investigated. Obtained results demonstrated that the mesostructure still retained even after twelve cycles, which may be ascribed to the “ordered” mesoporous properties and high thermal stability. In addition, a lower activation energy was obtained in this M-ZrPO catalytic system using dimethyl sulfoxide as solvent.
研究领域:
化学工程
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催化
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 10
·5608-5616
·
IF 7.443
Chan Wang,Miao Yang,Peng Tian,Shutao Xu,Yue Yang,Dehua Wang,Yangyang Yuan,Zhongmin Liu
A spherical self-assembly of SAPO-34 nanosheets was hydrothermally synthesized by using a quaternary ammonium-type organosilane surfactant [3-(trimethoxysilyl)propyl]octadecyldimethylammonium chloride (TPOAC) as the mesoporogen and a part of the silica source, and diethylamine (DEA) as the microporous template. The prepared materials were well characterized by XRD, XRF, SEM, TEM, N2 adsorption–desorption, NH3-TPD, NH3-adsorbed IR and pyridine-adsorbed IR measurements. It revealed that the morphologies, compositions and acidity of the SAPO-34 products changed significantly with the increased TPOAC/TEOS ratio, showing that the TPOAC/TEOS ratio had a significant impact on the crystallization process of SAPO-34. Solid state 13C, 29Si NMR and TG-DTA analyses were further conducted to investigate the status of TPOAC in the final products. A possible crystallization process involving TPOAC was proposed. The catalytic performances of the synthesized SAPO-34s were evaluated using the MTO reaction. The optimal SAPO-34 nanosheet assemblies with a hierarchical porous structure displayed a remarkably enhanced catalytic lifetime and high yields of light olefins.
研究领域:
材料科学
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化学工程
·
催化
·
无机化学
✓ 已验证
DOI
高影响因子
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