Dual-active-site Fe/Cu single-atom nanozymes with multifunctional specific peroxidase-like properties for S2− detection and dye degradation
Dual-active-site Fe/Cu single-atom nanozymes with multifunctional specific peroxidase-like properties for S2− detection and dye degradation
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具有多功能特异性过氧化物酶样特性的双活性位点 Fe/Cu 单原子纳米酶，用于 S2â 检测和染料降解
DOI：
10.1016/j.cclet.2022.107969
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发表时间：
2022-11
影响因子：
9.1
通讯作者：
Xiupei Yang
中科院分区：
文献类型：
--
作者：
Xiaofang Chen;Ya Wang;Min Feng;Die Deng;Xiaoyi Xie;Caixia Deng;Kashif Nawaz Khattak;Xiupei Yang
设计具有密集暴露的金属原子活性位点的单原子纳米酶并增强催化活性以检测污染物仍然是一个严峻的挑战。本文以叶酸为模板，采用水热高温热解法合成了一种具有层状堆叠的Fe/Cu双活性中心的单原子纳米酶（Fe/Cu-NC SAzyme）。与Fe-NC、Cu-NC SAzyme相比，Fe/Cu-NC SAzyme具有更高的类过氧化物酶活性，表明Fe/Cu-NC的掺杂可以提高其催化活性，Fe/Cu-NC中Fe和Cu的原子负载量分别为5.5wt%和2.27wt%。在Fe/Cu-NC催化体系中加入S2 −，可建立高灵敏度、高选择性的S2 −比色传感平台，线性范围宽（0.09 ~ 6 μmol/L），检出限低（30 nmol/L），可用于环境水样中S2 −的检测。更重要的是，Fe/Cu-NC SAzyme可以激活过一硫酸盐（PMS），在10分钟内降解99.9%的罗丹明B（Rh B），降解动力学为0.5943 min −1。这项工作详细介绍了有吸引力的应用Fe/Cu-NC SAzyme比色传感和染料降解。成功制备了具有选择性和过氧化物酶活性的Fe/Cu-N-C双酶活性位点SAZyme，并将其应用于S2 −检测和有机染料降解。
Designing single-atom nanozymes with densely exposed metal atom active sites and enhancing catalytic activity to detect pollutants remain a serious challenge. Herein, we reported a single-atom nanozyme with layered stacked Fe/Cu dual active sites (Fe/Cu-NC SAzyme) synthesized via hydrothermal and high-temperature pyrolysis using folic acid as a template. Compared with Fe-NC, Cu-NC SAzyme, Fe/Cu-NC SAzyme has higher peroxidase-like activity, which indicates that the doping of synthesized Fe/Cu bimetal can improve the catalytic activity, and the atomic loading of Fe and Cu in Fe/Cu-NC is 5.5 wt% and 2.27 wt%. When S 2− is added into Fe/Cu-NC catalytic system, a high-sensitivity and high-selectivity S 2− colorimetric sensing platform can be established, with wide linear range (0.09-6 μmol/L) and low detection limit (30 nmol/L), which can be used to detect S 2− in environmental water samples. What's more, the Fe/Cu-NC SAzyme can activate peroxymonosulfate (PMS) to degrade 99.9% of rhodamine B (RhB) within 10 min with a degradation kinetics of 0.5943 min −1 . This work details attractive applications in Fe/Cu-NC SAzyme colorimetric sensing and dye degradation. Fe/Cu-N-C bimetallic active site SAzymes were successfully prepared with good selectivity and peroxidase activity, which can be well applied to S 2− detection and organic dye degradation.
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