FUEL
·
2019
·
IF 5.128
Kejia He,Qiang Song,Zhennan Yan,Na Zheng,Qiang Yao
Alkaline injection is an effective way to control the emission of high concentration SO 3 caused by the use of high-sulfur coal and selective catalytic reduction (SCR), but its performance is affected by the competitive absorption of SO 2 . A fixed-bed reactor was used to study the competitive absorption of SO 3 and SO 2 by Ca(OH) 2 . The dynamic absorption curves in different atmospheres were obtained, the intermediate products were characterized, and the competitive absorption mechanism was discussed. The absorption of SO 3 and SO 2 consists of the chemical kinetics-controlled and product layer diffusion-controlled stages. In the chemical kinetics-controlled stage, the SO 3 and SO 2 removal efficiencies were around 90% and 55% at first and then decreased; the SO 3 selectivity was around 0.1 at first and then increased. In the product layer diffusion-controlled stage, the SO 3 removal efficiency gradually decreased but kept greater than 10%, while the SO 2 removal efficiency deceased to zero; the SO 3 selectivity continued to increase and reached 0.31 at most when SO 2 absorption ceased. There existed significant competition between SO 3 and SO 2 absorption. The increasing SO 3 concentration promoted the SO 3 absorption and the increasing SO 2 concentration decreased it. The absorption of SO 3 increased the intensity of the SO 4 2 - band, decrease the intensity of the SO 3 2 - band, and made the product layer more compact. The possibility of SO 3 reacting with the components (CaSO 3 , CaSO 4 and CaCO 3 ) on the reacted Ca(OH) 2 surface was analyzed. Ionic diffusion was proposed as the main mechanism of the continuous SO 3 absorption after the formation of a dense product layer.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Bo Jing,Xinke Xu,Jingze Wang,Changyan Sun,Wenjun Li,Zhidong Chang
L-lactate is an essential biomarker in clinical diagnostics and food quality assessment. This study introduces a novel ratiometric fluorescence sensor, RhB@Zn-MOF, which was specifically designed for the sensitive and selective detection of L-lactate. Through the strategic incorporation of Rhodamine B (RhB) into Zn-MOF, RhB@Zn-MOF was synthesized, exhibiting dual-emission properties and could effectively distinguish L-lactate in complex biological and food matrices such as milk and sweat based on the competitive absorption mechanism. Notably, the sensor achieves a low detection limit of 0.091 μM and demonstrates excellent stability and reproducibility in varied conditions. Furthermore, the integration of the sensor with smartphone technology enables rapid, real-time analysis, showcasing potential applications in sports medicine, clinical environments, and the food industry.
研究领域:
分析化学
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生物技术
·
临床诊断
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食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Qinyi Zhang,Jiaqi Liang,Junyi Zhang,Zhidong Chang,Yanjun Zhao,Changyan Sun
Considering the potential risks of ferulic acid (FA), this study developed a novel fluorescent probe based on Zn-MOF for the efficient detection of FA in food. The Zn-MOF was successfully synthesized by solvothermal method, and its structure and stability were confirmed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and powder X-ray diffraction (PXRD). It exhibited strong fluorescence at 420 nm under 348 nm excitation, and maintained 92.3 % of its fluorescence intensity after 7 days of ethanol immersion and 95.6 % at pH 3–12, demonstrating excellent chemical stability. The Zn-MOF could be used to detect FA and showed high sensitivity with the detection limit of 91.8 nM. The competitive experiments indicated that 17 common interferents had no significant effect on the detection (the fluorescence response change <5 %). The fluorescence of the sensing platform remained at 98.5 % after 5 cycles of use. Mechanism studies revealed that the fluorescence quenching was caused by the synergistic effect of photoinduced electron transfer, inner filter effect and competitive absorption. In the actual detection of corn wine samples, the method had a recovery rate of 100.7–104.1 % and a relative standard deviation (RSD) of less than 2.31 %, verifying its reliability in complex matrices. Furthermore, a fluorescent sensing composite material for FA was successfully developed by physically blending Zn-MOF with polyvinyl alcohol (PVA).
研究领域:
分析化学
·
食品科学
·
材料科学
·
荧光传感
·
金属有机框架（MOFs）
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Song Xie,Jing Shi,Yicun Liang,Xiaozhan Yang,Wenlin Feng
Terbium metal organic frameworks (Tb-MOFs) hollow spheres were synthesized by solvothermal method, using 5-aminoisophthalic acid (H 2 AIP) as organic ligand, 2-methylimidazole (2-MI) as competitive ligand and protective agent. Tb-MOFs exhibit excellent luminescent sensing properties to water in organic solvents , and the limit of detections (LODs) in N , N -dimethylformamide and ethanol are 0.000515% and 0.000422%, respectively. Water can not only enhance the luminescent properties of Tb-MOFs, and also a new emission peak at 418 nm (or 427 nm) appears. The enhancement and new peak are quenched by the Fe 3+ in water, and the LODs of Tb-MOFs for Fe 3+ at 402 nm and 545 nm are 0.45 μM and 0.71 μM, respectively. The sensing mechanism for water is water can replace part of the coordination of H 2 AIP with Tb 3+ , and the sensing mechanism for Fe 3+ is that the competitive absorption between Fe 3+ and H 2 AIP inhibits the energy absorption of the organic ligand.
研究领域:
材料科学
·
分析化学
·
纳米技术
·
传感器
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Wenqing Li,Jingyue Zhang,Linhan Fan,Yun Zhao,Changyan Sun,Wenjun Li,Zhidong Chang
Aniline is an organic pollutant with carcinogenicity and teratogenicity, while F - and Hg 2+ are toxic ions that are easily soluble in water. When they are released to the environment, they will pose a threat to human health. Designing a material that can simultaneously detect three types of pollutants is of great significance. In this paper, a novel rare earth metal organic framework material (Eu-MOF) with three-dimensional structure based on 1-methylimidazole-4,5-dicarboxylic acid was synthesized for the first time through solvent thermal method. It has excellent luminescent performance and can be used as a multifunctional fluorescent probe to detect aniline, F - , and Hg 2+ based on photoinduced electron transfer, energy competitive absorption, and ion exchange mechanisms, with detection limits of 1.79 × 10 -8 , 8.13 × 10 -8 , and 8.83 × 10 -7 M, respectively. It is worth noting that Eu-MOF can detect F - and Hg 2+ in real water samples, such as lake water and green tea water, with favorable recovery rates.
研究领域:
材料科学
·
环境化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）