{"title":"一个工程Au-MXene吸附陷阱使双通道超快速和选择性检测痕量气态元素汞。","authors":"Mingze Jiao, , , Jia Chen, , , Lulu Yang, , , Qinyuan Hong, , , Yiqi Feng, , , Wenjun Huang, , , Bing Pei, , , Qianxuan Zhang, , , Qingyan Fu, , , Zan Qu, , , Naiqiang Yan, , and , Haomiao Xu*, ","doi":"10.1021/acs.analchem.5c02853","DOIUrl":null,"url":null,"abstract":"<p >Accurate detection of trace atmospheric mercury is critical for toxicological assessment and environmental protection. However, achieving parts per billion-level sensitivity with high selectivity between gaseous elemental mercury (Hg<sup>0</sup>) and oxidized mercury (Hg<sup>2+</sup>) remains a significant challenge. Here, we present a novel dual-channel enrichment trap system that selectively captures Hg<sup>0</sup> by using a layered Au-MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>) composite as the sorption trap. This composite demonstrates exceptional selectivity for Hg<sup>0</sup>, with a selectivity ratio of up to 76.7 over Hg<sup>2+</sup>, and achieves 99.7% ± 0.3% (<i>n</i> = 3) sorption efficiency for ppb-level Hg<sup>0</sup> within 30 min at room temperature. Complete desorption is achieved in just 90 s at 300 °C, demonstrating a response time of 45 s for Hg<sup>0</sup> detection through the dual-electrothermal Hg<sup>0</sup> channel. The Au–Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> preconcentration cartridge exhibits excellent moisture resistance, high-temperature stability, and long-term durability. Density functional theory (DFT) calculations reveal that the built-in electric field at the Au–Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> interface accelerates electron transfer, reducing preconcentration and regeneration times. This technology integrates seamlessly with the cold vapor atomic absorption spectrophotometer (CVAAS) method to form a mercury dual-channel continuous emission measurement system (Hg DCEMS), ensuring highly selective and precise trace Hg<sup>0</sup> detection. This advancement provides a device for accurately measuring the Hg<sup>0</sup> concentration, enabling better mercury pollution control.</p>","PeriodicalId":27,"journal":{"name":"Analytical Chemistry","volume":"97 39","pages":"21366–21375"},"PeriodicalIF":6.7000,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"An Engineered Au-MXene Sorption Trap Enables Dual-Channel Ultrafast and Selective Detection of Trace Gaseous Elemental Mercury\",\"authors\":\"Mingze Jiao, , , Jia Chen, , , Lulu Yang, , , Qinyuan Hong, , , Yiqi Feng, , , Wenjun Huang, , , Bing Pei, , , Qianxuan Zhang, , , Qingyan Fu, , , Zan Qu, , , Naiqiang Yan, , and , Haomiao Xu*, \",\"doi\":\"10.1021/acs.analchem.5c02853\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Accurate detection of trace atmospheric mercury is critical for toxicological assessment and environmental protection. However, achieving parts per billion-level sensitivity with high selectivity between gaseous elemental mercury (Hg<sup>0</sup>) and oxidized mercury (Hg<sup>2+</sup>) remains a significant challenge. Here, we present a novel dual-channel enrichment trap system that selectively captures Hg<sup>0</sup> by using a layered Au-MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>) composite as the sorption trap. This composite demonstrates exceptional selectivity for Hg<sup>0</sup>, with a selectivity ratio of up to 76.7 over Hg<sup>2+</sup>, and achieves 99.7% ± 0.3% (<i>n</i> = 3) sorption efficiency for ppb-level Hg<sup>0</sup> within 30 min at room temperature. Complete desorption is achieved in just 90 s at 300 °C, demonstrating a response time of 45 s for Hg<sup>0</sup> detection through the dual-electrothermal Hg<sup>0</sup> channel. The Au–Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> preconcentration cartridge exhibits excellent moisture resistance, high-temperature stability, and long-term durability. Density functional theory (DFT) calculations reveal that the built-in electric field at the Au–Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> interface accelerates electron transfer, reducing preconcentration and regeneration times. This technology integrates seamlessly with the cold vapor atomic absorption spectrophotometer (CVAAS) method to form a mercury dual-channel continuous emission measurement system (Hg DCEMS), ensuring highly selective and precise trace Hg<sup>0</sup> detection. This advancement provides a device for accurately measuring the Hg<sup>0</sup> concentration, enabling better mercury pollution control.</p>\",\"PeriodicalId\":27,\"journal\":{\"name\":\"Analytical Chemistry\",\"volume\":\"97 39\",\"pages\":\"21366–21375\"},\"PeriodicalIF\":6.7000,\"publicationDate\":\"2025-09-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Analytical Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acs.analchem.5c02853\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, ANALYTICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Analytical Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acs.analchem.5c02853","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
An Engineered Au-MXene Sorption Trap Enables Dual-Channel Ultrafast and Selective Detection of Trace Gaseous Elemental Mercury
Accurate detection of trace atmospheric mercury is critical for toxicological assessment and environmental protection. However, achieving parts per billion-level sensitivity with high selectivity between gaseous elemental mercury (Hg0) and oxidized mercury (Hg2+) remains a significant challenge. Here, we present a novel dual-channel enrichment trap system that selectively captures Hg0 by using a layered Au-MXene (Ti3C2Tx) composite as the sorption trap. This composite demonstrates exceptional selectivity for Hg0, with a selectivity ratio of up to 76.7 over Hg2+, and achieves 99.7% ± 0.3% (n = 3) sorption efficiency for ppb-level Hg0 within 30 min at room temperature. Complete desorption is achieved in just 90 s at 300 °C, demonstrating a response time of 45 s for Hg0 detection through the dual-electrothermal Hg0 channel. The Au–Ti3C2Tx preconcentration cartridge exhibits excellent moisture resistance, high-temperature stability, and long-term durability. Density functional theory (DFT) calculations reveal that the built-in electric field at the Au–Ti3C2Tx interface accelerates electron transfer, reducing preconcentration and regeneration times. This technology integrates seamlessly with the cold vapor atomic absorption spectrophotometer (CVAAS) method to form a mercury dual-channel continuous emission measurement system (Hg DCEMS), ensuring highly selective and precise trace Hg0 detection. This advancement provides a device for accurately measuring the Hg0 concentration, enabling better mercury pollution control.
期刊介绍:
Analytical Chemistry, a peer-reviewed research journal, focuses on disseminating new and original knowledge across all branches of analytical chemistry. Fundamental articles may explore general principles of chemical measurement science and need not directly address existing or potential analytical methodology. They can be entirely theoretical or report experimental results. Contributions may cover various phases of analytical operations, including sampling, bioanalysis, electrochemistry, mass spectrometry, microscale and nanoscale systems, environmental analysis, separations, spectroscopy, chemical reactions and selectivity, instrumentation, imaging, surface analysis, and data processing. Papers discussing known analytical methods should present a significant, original application of the method, a notable improvement, or results on an important analyte.