Article
Chemistry, Analytical
Lanlan Li, Qirui Huang, Jing Xiao, Jiamin Feng, Shu Zhang, Hong Luo, Zhirong Zou, Xiaoli Xiong
Summary: In this study, Fe3O4 served as both an adsorbent and photocatalyst in the photochemical vapor generation-atomic fluorescence spectrometry (PVG-AFS) determination of Bi(III) after preconcentration. The effects of formic and acetic acid concentration, UV irradiation time, Fe3O4 concentration, and interferences from co-existing ions were investigated. Results showed that the AFS intensity was slightly enhanced by the mixed acid solution, but a significant enhancement was observed when Fe3O4 was used as a photocatalyst. Fe3O4 can decompose in the mixed acid solution, generating Fe3+ which acts as a sensitizer for improving Bi(III) efficiency. Under optimized conditions, the LOD of the proposed PVG-AFS system with or without preconcentration (5 mL sample) were 0.44 ng/mL and 0.07 ng/mL, respectively. The PVG-AFS system was successfully applied to the determination of water samples and demonstrated good accuracy and applicability with recoveries ranging from 94% to 104%.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Jiaju Hu, Ying Yu, Zhuolin Xiao, Ying Gao
Summary: Photochemical vapor generation (PVG) of Zinc (Zn) and Gallium (Ga) was reported for the first time in this study. The study investigated the main parameters influencing PVG of Zn and Ga and found that formic acid (FA) and Cu2+ were required for the generation of volatile species. The study also examined the effects of interfering ions on PVG of Zn and Ga and speculated the formation of carbonyl compounds. Good precisions and low limits of detection were achieved with PVG-ICP-MS measurement. Furthermore, nanoparticles containing Cu, Zn or Ga were discovered in the liquid solution after UV irradiation.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Analytical
Yuheng Lu, Chenghui Li, Yunfei Tian, Jing Hu, Xiandeng Hou
Summary: The highly sensitive detection of trace tellurium (Te(IV)) in real samples with complicated matrix was achieved by using a new method based on photochemical vapor generation-atomic fluorescence spectrometry (PVG-AFS) and Co-MOF-74 as an adsorbent and Co2+ ion sensitizer. The synthesized Co-MOF-74 showed excellent adsorption capability for Te(IV) within a short time. After conversion to volatile compounds under UV irradiation, the Te(IV) was detected by AFS. The proposed method exhibited a limit of detection of 0.08 ng/mL for Te(IV) after a 50-fold preconcentration and was successfully applied to the analysis of various natural water samples with satisfactory spike recoveries.
ANALYTICA CHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Ying Yu, Hanjiao Chen, Qian Zhao, Qing Mou, Liang Dong, Ruilin Wang, Zeming Shi, Ying Gao
Summary: Enhancement and/or suppression effects on the photochemical vapor generation (PVG) of 17 elements at the gas-liquid interface were observed, with up to 7.3-fold increase in analytical sensitivity in the presence of gas-liquid interface(s) compared to traditional methods. The introduction of gas-liquid interface(s) and elevated temperature likely facilitated radical generation, subsequent reactions, and separation/detection of volatile species of elements, while unstable intermediate substances/products decomposed at high temperatures, decreasing analyte signal response. This finding contributes to understanding element transport under UV irradiation and has potential applications in trace element analysis in environmental and biological samples.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Jakub Soukal, Stanislav Musil
Summary: The PVG of Ni in fresh water samples was optimized for high sensitivity and low LOD using a flow-through photoreactor with 30% formic acid, achieving an overall efficiency of 42% and LOD of 1.9 ng L-1. The addition of 1.5 M ammonium formate improved efficiency, but did not significantly impact analytical performance. Interferences from inorganic anions and transition metals were investigated, and accuracy was confirmed through analysis of standard reference materials.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Shanghua Xing, Jun Liang, Philipp Brandt, Felix Schaefer, Alexander Nuhnen, Tobias Heinen, Istvan Boldog, Jens Moellmer, Marcus Lange, Oliver Weingart, Christoph Janiak
Summary: In this study, a pre-synthetic pore environment design strategy was utilized to create stable methyl-functionalized metal-organic frameworks (MOFs) for enhanced low pressure SO2 adsorption and separation from CO2. The key role of increasing methyl group densities at the benzenedicarboxylate linker in optimizing pore size was demonstrated for the first time. Various methods, including gas sorption isotherms, theoretical calculations, simulations, and DFT calculations, were used to validate the SO2 separation potential of methyl-functionalized MOFs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Analytical
Jaromir Vyhnanovsky, Dilek Yildiz, Barbora Stadlerova, Stanislav Musil
Summary: The study achieved photochemical vapor generation of bismuth with optimal conditions determined through investigating the influence of sensitizers and reaction medium flow rate. Combining PVG with atomic fluorescence spectrometry can provide low limits of detection at a low operation cost.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Karen D. J. Hindricks, Andreas Schaate, Peter Behrens
Summary: The availability of highly adaptable materials in suitable shapes is essential for fabricating next-generation MOF-based devices. In this study, thin films of a photoreactive benzophenone unit-containing metal-organic framework (MOF) were presented. Crystalline, oriented, and porous films of the zirconium-based bzpdc-MOF were prepared by direct growth on silicon or glass substrates. Through photochemical modification of the Zr-bzpdc-MOF films, various properties can be tuned by covalently attaching modifying agents, including small molecules and grafting-from polymerization reactions. Furthermore, 2D structuring and photo-writing of defined structures, such as micro-patterned MOF surfaces, are possible via a photolithographic approach.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Analytical
Jing Hu, Hanjiao Chen, Xiaoming Jiang, Xiandeng Hou
Summary: In this study, it was found that photochemical vapor generation of halides can be achieved in organic-acid-free media, with performance comparable to traditional scenarios using acetic acid. The role of copper acetate complexes in facilitating the generation of halides was highlighted. Gas chromatography-mass spectrometry was used to identify methyl halides as principal volatile compounds, and various intermediate species were confirmed using different analytical methods. The method's application in analyzing bottled water and seawater showed spike recoveries between 92 and 101%.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Applied
Manlu Wang, Juan He, Jin Luo, Jing Hu, Xiandeng Hou
Summary: A novel method for ultrasensitive detection and nonchromatographic speciation of inorganic arsenic by ICP-MS was developed using CdS/MIL-100(Fe) composites. The method successfully determined trace inorganic arsenic in various food and water samples, showing promising potential for application in environmental and food safety analysis.
Article
Chemistry, Physical
Daoming Chen, Xiaolin Li, Jiayi Huang, Yuxuan Chen, Zili Liu, Yongchao Huang
Summary: This study presents a convenient and efficient strategy for Fe doping into BiVO4 and hybrid CoO(x) OECs to achieve a Fe-BiVO4/CoO(x) photoanode. The resulting photoanode demonstrates a photocurrent density of 4.0 mA/cm2 and high charge transfer (74.4%)/separation efficiency (71.2%) at 1.23 V vs RHE under AM 1.5 G illumination. The synergistic effect of Fe doping and CoO(x) OEC loading significantly enhances the electrical conductivity and carrier density of BiVO4. This work provides valuable experimental data for improving the PEC performance of BiVO4.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Chemical
Poyi Tu, Xunming He, Raed Abu-Reziq, Chunyue Pan, Juntao Tang, Guipeng Yu
Summary: In this study, an analogous covalent triazine framework with adjustable fluorine content was successfully prepared, showing enhanced CO2/CH4 and CH4/N2 selectivity and notable iodine adsorption capacity in vapor phase.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xiaozu Zhang, Dongtao Wang, Hiromi Nagaumi, Rui Wang, Zibin Wu, Xinzhong Li, Haitao Zhang
Summary: This paper introduces a method for achieving particle agglomeration and efficient Fe separation in Al-Si alloy melt through the melt turbulence process. Experimental results show that the intervention of rotor stirring and argon blowing promotes the collision, adhesion, and agglomeration of Fe-containing particles, resulting in high Fe separation efficiency.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Vikram Vinayak Karve, Jordi Espin, Mehrdad Asgari, Samuel Van Gele, Emad Oveisi, Wendy Lee Queen
Summary: Novel carbons with high density of micropores and N-content are reported for post-combustion CO2 capture. The starting materials significantly impact the structure and performance of the carbons. Acid treated carbons show impressive CO2 adsorption capacity, selectivity, breakthrough times, and cyclability.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Analytical
Yongchun Liu, Jie Zou, Bin Luo, Hairong Yu, Zhigang Zhao, Hui Xia
Summary: Using natural plant extracts as auxiliary matrix or photocatalysts can enhance the efficiency and sensitivity of photochemical vapor generation atomic fluorescence spectrometry for trace mercury determination, while reducing biological toxicity and secondary pollution. This green and sensitive method provides an experimental basis for expanding the photochemical vapor generation system.
MICROCHEMICAL JOURNAL
(2021)