Siqi Chen,Tingting Li,Donglian Deng,Yibing Ji,Ruijun Li
This work innovatively integrated the peroxidase-mimicking activity and red emission property of Fe@PCN-222 framework, designed a cascade reaction system for dual-mode glucose sensing. The Fe 3+ doping significantly improved the catalytic activity of Fe@PCN-222 that can oxidize the substrate o -phenylenediamine (OPD) to generate diminophenazine (DAP) with emission at 566 nm in the presence of H 2 O 2 . Similarly, the Fe@PCN-222 was used to catalyze the colorless TMB to produce blue oxidized TMB (oxTMB) showed absorption at 652 nm. When coupled with glucose oxidase (GOx), the linear ranges of ratiometric fluorescence mode and colorimetric mode for glucose sensing were 1–100 and 10–300 μM, respectively. And the limits of detection (LOD) of 0.78 and 2.41 μM for two modes were obtained, respectively. In addition, the practicability of Fe@PCN-222 nanozyme-based cascade reaction system for detection of glucose in human serum and saliva samples was successfully investigated. It is of great importance to integrate more functions into one skeleton to achieve dual-mode and optimal-performance sensing for expanding potential applications.
Tao Yang,Ge Zeng,Maoju Jiang,Peng Su,Chenlong Liu,Qixiao Lv,Wenqi Li,Xiangyang Hou,Juan Li
Periodate (PI)-based advanced oxidation processes have gained increasing interest. This study for the first time elevates the light-activation capacity of PI by using far UVC at 222 nm (UV 222 /PI) without extra chemical inputs. The effectiveness and the underlying mechanisms of UV 222 /PI for the remediation of micropollutants were studied by selecting atenolol (ATL) as a representative. PI possessed a high molar absorption coefficient of 9480–6120 M −1 cm −1 at 222 nm in the pH range of 5.0–9.0, and it was rapidly decomposed by UV 222 with first-order rate constants of 0.0055 to 0.002 s −1 . ATL and the six other organic compounds were effectively degraded by the UV 222 /PI process under different conditions with the fluence-based rate constants generally two to hundred times higher than by UVA photolysis. Hydroxyl radical and ozone were confirmed as the major contributors to ATL degradation, while direct photolysis also played a role at higher pH or lower PI dosages. Degradation pathways of ATL were proposed including hydroxylation , demethylation , and oxidation. The high energy efficiency of the UV 222 /PI process was also confirmed. This study provides a cost-effective and convenient approach to enhance PI light-response activity for the treatment of micropollutants.
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