第一作者:劉震 通訊作者:李倩 教授 論文DOI: 10.1016/j.watres.2025.123147 催化劑合成與表征方法 Fig. 1. (a)
Synthesis of different materials. (b) XRD of different materials. (c) Fe K-edge
XANES spectra of different materials. (d) FT-EXAFS curves of Fe. (e) Mo K-edge
XANES spectra of different materials. (f) FT-EXAFS curves of Mo. (g and h)
EXAFS wavelet transform of Fe and Mo in Fe/Mo-DACs. (i) 57FeM?ssbauerspectroscopy measurements of Fe/Mo-DACs. (j) HAADF-STEM images of
Fe/Mo-DACs. (k) HAADF-TEM and TEM-mapping of Fe/Mo-DACs. (l) Possible structure
of metal sites in Fe/Mo-DACs. Copyright 2025, Elsevier Inc. 性能測(cè)試 Fig. 2. (a-c) Degradation of BPA in different reaction systems. (d-f) Influence of Na2C2O4on the degradation of BPA in the Fe/Mo-DACs/PMS and Fe-SACs/PMS systems. (g and h) The degradation of different organic pollutants in the Fe/Mo-DACs/PMS system. (i and j) Cyclic stability of the Fe/Mo-DACs/PMS system. Copyright 2025, Elsevier Inc. 與不同的催化降解體系相比,,Fe/Mo-DACs/PMS體系展現(xiàn)了最高的類(lèi)芬頓性能,,這得益于Fe/Mo-DACs中高活性的Fe位點(diǎn)。并且Fe/Mo-DACs/PMS體系具有良好的循環(huán)應(yīng)用潛力和復(fù)雜有機(jī)物去除能力,。 催化機(jī)理 Fig. 3. (a-b) Effect of different trapping agents in the Fe/Mo-DACs/PMS system. (c) BPA degradation in the Fe/Mo-DACs/PMS/D2O system. (d) EPR spectra of different ROS in Fe/Mo-DACs/PMS and Fe/Mo-DACs/PMS/BPA systems. (e) PMSO degradation and corresponding PMSO2production in the Fe/Mo-DACs/PMS system. (f-h) Effects of PMSO, premixing experiment and NaClO4 on the BPA degradation in the Fe/Mo-DACs/PMS system. (i) Stability of ETP in different reaction systems. (j) The in-situ Raman spectra. (k) Different types of ETP. (l) GOP reaction device setup. (m) The contribution rates of reactive species to BPA degradation in the Fe/Mo-DACs/PMS system. Copyright 2025, Elsevier Inc. 探針實(shí)驗(yàn),、自由基捕獲實(shí)驗(yàn)、EPR測(cè)試和原位拉曼等分析方法協(xié)同顯示Fe/Mo-DACs/PMS體系中BPA的降解是以電子傳遞途徑(ETP)為主導(dǎo)的,。 DFT計(jì)算 Fig. 4. (a) Different optimized catalytic models. (b) ELF images of different models. (c) Adsorption energy of PS on different models, O-O bond and O-H bond length of different catalytic models. (d) Charge density of different catalysts/PMS systems. (e and f) The Fe d orbit DOS of different catalytic models and models-PMS system. (g and h) -pCOHP of Fe dxz-O 2px and Fe dyz-O2pz of Fe/Mo-DACs/PMS system. (i) Fe 3d orbit analysis in different models. (j) Fe-O bonding patterns in different catalytic models. (k) Changes of Fe species in Fe/Mo-DACs before and after reaction. (l) Reaction mechanism of Fe/Mo-DACs/PMS system. Copyright 2025, Elsevier Inc. DFT計(jì)算進(jìn)一步證明Fe/Mo雙原子位點(diǎn)是PMS活化的真正活性位點(diǎn),,較強(qiáng)的PMS吸附能和電子轉(zhuǎn)移性能使得Fe/Mo-DACs具有更強(qiáng)的界面氧化性復(fù)合物生成能力和類(lèi)芬頓反應(yīng)活性。Mo位點(diǎn)的引入也有助于實(shí)現(xiàn)反應(yīng)過(guò)程中有效的Fe2+/Fe3+循環(huán),,最終增強(qiáng)了Fe/Mo-DACs/PMS體系的類(lèi)芬頓降解性能,。 降解路徑、毒性評(píng)估及生命影響評(píng)價(jià) Fig. 5. (a) Structure of different types of organics. (b) Degradation performance of the Fe/Mo-DACs/PMS system for different organics at pH=2. (c) The LUMO and HOMO values of different organics. (d) Correlation analysis of IP values and degradation rates of different organics. (e) Optimal structure and Fukui of BPA molecule. (f) The possible degradation pathways of BPA in the Fe/Mo-DACs/PMS systems. Copyright 2025, Elsevier Inc. 不同種類(lèi)有機(jī)物的DFT計(jì)算和降解實(shí)驗(yàn)協(xié)同表明,,Fe/Mo-DACs/PMS體系對(duì)給電子有機(jī)污染物具有更強(qiáng)的選擇性降解性能,。DFT 計(jì)算和HPLC-MS測(cè)試也進(jìn)一步證明了Fe/Mo-DACs/PMS體系具有較好的環(huán)境安全性。 本研究通過(guò)開(kāi)發(fā)一種“催化/助催化”Fe/Mo雙原子材料Fe/Mo-DACs,,用于高效的類(lèi)芬頓水處理反應(yīng),。Fe/Mo雙原子位點(diǎn)的引入不僅優(yōu)化了催化劑的類(lèi)芬頓性能,也增強(qiáng)了材料的循環(huán)穩(wěn)定性,。實(shí)驗(yàn)驗(yàn)證和理論分析表明,,Fe/Mo雙原子結(jié)構(gòu)和獨(dú)立的Fe單原子位點(diǎn)通過(guò)調(diào)節(jié)Fe活性中心的電子態(tài)來(lái)增強(qiáng)對(duì)PMS的界面活化反應(yīng)。高效穩(wěn)定的Fe/Mo-DACs-PMS*復(fù)合物的形成增強(qiáng)了ETP的降解貢獻(xiàn),。Mo位點(diǎn)對(duì)Fe2+/Fe3+循環(huán)的增強(qiáng)作用進(jìn)一步提高了Fe/Mo-DACs的催化應(yīng)用潛能,。此外,,Fe/Mo-DACs/PMS體系具有良好的環(huán)境適應(yīng)性,、環(huán)境安全性和選擇性降解性能。綜上,,本研究將為原子級(jí)類(lèi)芬頓催化劑的設(shè)計(jì)和應(yīng)用機(jī)理提供技術(shù)和理論指導(dǎo),并進(jìn)一步增強(qiáng)鐵基非均相材料在實(shí)際水處理中的應(yīng)用潛力,。 ZhenLiu, Xin-Yi Xu, Fei Xu, Rui-Dian Su, Bin Li, Fang Zhang, Xing Xu, Yan Wang, De-Fang Ma, Bao-Yu Gao, Qian Li, Diatomic 'catalytic/co-catalytic' Fe/Mo catalysts promote Fenton-like reaction to treat organic wastewater through special interfacial reaction enhancement mechanism, Water Res., 2025, DOI: 10.1016/j.watres.2025.123147 https:///10.1016/j.watres.2025.123147 |
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