ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Shi-Wen Lv,Jialu Pan,Xiaoran Wang,Yifan Shao,Yanqing Cong,Lin Che
It is of great significance to establish an effective method for removing Cr(VI) from wastewater. Herein, Fe-doped g-C 3 N 4 (namely Fe-g–C 3 N 4 –2) was synthesized and then employed as photocatalyst to conduct the test of Cr(VI) reduction. Notably, the embedding of Fe ion in g-C 3 N 4 can offer the Fe 2+ /Fe 3+ redox couples, so reducing the interfacial resistance of charge transfer and suppressing the recombination of photogenerated electrons and holes. The impurity energy levels will form in g-C 3 N 4 after the introduction of Fe ion , thereby boosting the light absorption capacity of catalyst. Thus, Fe-g–C 3 N 4 –2 showed good performance in photocatalytic Cr(VI) reduction, and the reduction efficiency of Cr(VI) can reach 39.9% within 40 min. Different with many previous studies, current work unexpectedly found that the addition of p -benzoquinone (BQ) can promote the Cr(VI) reduction, and the reduction efficiency of Cr(VI) over Fe-g–C 3 N 4 –2 was as high as 93.2% in the presence of BQ (1.5 mM). Further analyses showed that BQ can be reduced to hydroquinone (HQ) by photogenerated electrons, and UV light can also directly induce BQ to generate HQ by using H 2 O as the hydrogen donor . The HQ with reducing ability can accelerate the Cr(VI) reduction. In short, current work shared some novel insights into photocatalytic Cr(VI) reduction in the presence of BQ. Future research should consider possible reactions between photogenerated electrons and BQ. For the UV-induced photocatalysis , the suitability of BQ as the scavenger of O 2 •‒ must be given carefully consideration.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Breath Research
·
2015
·Vol. 9
·期 1
·016003
·
IF 4.631
Liying Peng,Lei Hua,Enyou Li,Weiguo Wang,Qinghua Zhou,Xin Wang,Changsong Wang,Jinghua Li,Haiyang Li
Ion mobility spectrometry (IMS) is a promising non-invasive tool for the analysis of exhaled gas and exhaled nitric oxide (NO), a biomarker for diagnosis of respiratory diseases. However, the high moisture in exhaled gas always brings about extra overlapping ion peaks and results in poor identification ability. In this paper, p-benzoquinone (PBQ) was introduced into IMS to eliminate the interference of overlapping ion peaks and realize the selective identification of NO. The overlapping ions caused by moisture were titrated by PBQ and then converted to hydrated PBQ anions (C6H4\text{O}_{2}^{-}(H2O)n). The NO concentration could be determined by quantifying gas phase hydrated nitrite anions (N\text{O}_{2}^{-}(H2O)n), product ions of NO. Under optimized conditions, a limit of detection (LOD) of about 1.4 ppbv and a linear range of 10–200 ppbv were obtained for NO even in 100% relative humidity (RH) purified air. Furthermore, this established method was applied to measure hourly the exhaled NO of eight healthy volunteers, and real-time monitoring the exhaled NO of an esophageal carcinoma patient during radical surgery. These results revealed the potential of the current dopant titrating IMS method in the measurement of exhaled NO for medical disease diagnosis.
研究领域:
医学诊断
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分析化学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lijuan Xu,Yangyang Li,Yuan Ji,Jichi Zhang,Lu Shao,Dawei Zhang,Lina Ma,Guolin Gao,Zaixing Jiang
Metallo-supramolecular polymer (MEPE)-based thin film electrochromic devices (ECDs) have been considered to be a promising platform for portable electronics as their low cost, excellent redox properties, high optical contrast, and rich colors. However, poor cycle stability and slow response speed are serious bottlenecks for widespread commercial devices. Here, a gel electrolyte functionalized by the anodic active species p -benzoquinone ( p -BQ) (GET-BQ) was reported. It has outstanding conductivity (∼4.62 mS cm −1 ) and transparency. Fe(Ⅱ)-MEPE-based ECDs incorporating the GET-BQ electrolyte (ECD-BQ) showed lower voltage operation (∼1.1 V), higher optical contrast (ca. ΔT ∼ 35.7%), faster response rate ( t b ∼ 2.5 s, t c ∼ 0.3 s), and superb cycling durability (<1.7% ΔT loss after 1440 cycles) than those without p -BQ. Moreover, the charge transport kinetics of ECD-BQ were explored by the CV curve, in situ infrared spectroelectrochemical analysis, and electrochemical impedance spectroscopy. The charge transfer mechanism of electrochromic material and electrolytes in ECD-BQ offers a novel entry to design superior electrolytes for high-performance ECD.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Yunying Yan,Jianjun Hao,Fenfen Xie,Fen Han,Linhai Jing,Pan Han
Magnesium-mediated reductive carboxylation of p-QMs with CO2 via an Umpolung strategy has been developed, which can be used for the preparation of various aryl acetic acids. This protocol featured high atom economy, mild conditions, and operational simplicity. The creation of this Umpolung carboxylation of p-QMs will unprecedentedly extend the application of p-QMs to nucleophilic reagents.
研究领域:
有机化学
·
环境化学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jianglong Shi,Chen Sun,Zongli Huo,Jia Gu,Jun Ma
This study demonstrated the synergy between peroxymonosulfate (PMS) and p- benzoquinone ( p -BQ) in the sulfamethoxazole (SMX) degradation under the ultraviolet (UV) irradiation. In the UV/ p -BQ/PMS process, the SMX degradation showed positive dependence on the initial dosages of PMS, p -BQ and SMX. The variation of the observed pseudo-first-order rate constant ( k obs ) exhibited aligned with the speciation of SO 5 2− across pH 7–10, and the anomalous decline of k obs emerged at pH 10–12. It suggested that SO 5 2− might be significant for the SMX degradation. The quenching experiments and the electron paramagnetic resonance spectroscopy confirmed the dominant reactive oxygen species (ROS) (i.e., sulfate radicals (SO 4 •– ), hydroxyl radicals (OH • ), singlet oxygen ( 1 O 2 ), peroxymonosulfate anion radical (SO 5 •– )) in the UV/ p -BQ/PMS process. The generation of SO 5 •– might be attributed to the single electron transfer (SET) mechanism from PMS to the triplet excited-state of p -BQ, which subsequently triggered the formation of SO 4 •– and 1 O 2 via disproportionation. The possible degradation pathways of SMX were identified by LC-MS, including the hydroxylation, the cleavage of S N bond, the nitration and the oxidation of amino group. Compared to p -BQ, methyl- p -benzoquinone, with an electron donating group, was found to suppress the activation of PMS, which validated the rationality of the SET mechanism. While tetrachloro-1,4-benzoquinone, with an electron withdrawing group, inhibited the SMX degradation by scavenging the generated radicals. Furthermore, the coexisting ions made no diffidence to the SMX degradation. The results provided the critical insights into the role of quinones in the PMS-based advanced oxidation processes for water treatment.
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高影响因子
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