Wang Jinshou,Shi Zhen,Jin Jing,Liu Qi,Zhang Shenghui
A three-dimensionally ordered macroporous (3DOM) film of polycysteine (poly-Cys) was used to modify a glassy carbon electrode (GCE) to result in a sensor for 4-aminophenol. The new electrode was used to study the behavior of 4-aminophenol by cyclic voltammetry and differential pulse voltammetry. In comparison to a bare GCE and a GCE modified with poly-Cys without using template, this electrode displays a larger peak current which may be attributed to the structure of poly-Cys and the large surface area of the macroporous structure. The anodic peak current at a working voltage of 195 mV is linearly related to the concentration of 4-aminophenol in two concentration intervals: 0.02 to 20 μM and 20 to 200 μM, respectively. The detection limit is 8 nM (at an S/N ratio of 3). The method was successfully applied to the determination of 4-aminophenol in spiked water samples.
A glassy carbon electrode modified with three-dimensionally ordered macroporous polycysteine film was developed to serve as a sensor for determination of 4-aminophenol. The modified electrode presents lower detection limit, wider linear range and long-term stability for the determination of 4-aminophenol.
Continuous decompression and drainage are a vital surgical strategy for managing severe tissue infections. In vital pulp therapy (VPT) for irreversible pulpitis, there is a clinical demand for advanced biomaterials capable of effectively sealing the pulp cavity, alleviating pulpal hypertension, preventing bacterial infiltration, and resolving acute pulp inflammation in bacteria-rich environments. In this study, we developed a polydopamine@zinc oxide nanoparticle (ZnO-NP)-coated polytetrafluoroethylene (PTFE) membrane with tunable Zn content ranging from 2.51 to 7.45 wt%. The polydopamine enhanced ZnO-NP adhesion to the PTFE membrane, enabling superior fluid permeability and robust antibacterial efficacy against E. faecalis and S. mutans , while maintaining excellent biocompatibility. In a minipig pulpitis model, the ZnO-coated membrane significantly outperformed iRootBP PLUS by promoting faster dentine bridge formation (934.0 ± 91.3 μm vs. 116.3 ± 45.4 μm), preserving the integrity of the underlying pulp tissue and inducing M2 macrophage polarization.These findings deomstrate that ZnO-functionalized fibrous membrane can address key challenges in VPT by alleviating pulp hypertension, preventing microbial invasion, and simultaneously promoting pulp tissue regeneration. This approach offers a promising strategy to enhance tharepeutic outcomes of vital pulp therapy.
Na Lu,Haibo Lin,Jianqiang Wang,Qiu Han,Fu Liu,Chuyang Y. Tang
Catalytic membrane is an appealing technology for eliminating refractory organic pollutants in comparison to conventional advanced oxidation methods. However, the application of this technology is constrained by the trade-off between membrane permeability and reactivity. Herein, we prepared a tubular macroporous catalytic membrane (MCM), which activated peroxymonosulfate to produce dominant singlet oxygen (1O2) and hydroxyl radicals (•OH) in the macropore channel (∼130 nm). The optimized MCM membrane demonstrated catalytic filtration performance far beyond the state-of-the-art, achieving >99% degradation of antibiotics, dyes, and phenolic compounds while simultaneously exhibiting ultrafast permeance (645.3 L m–2 h–1 bar–1). For the first time, we reveal the spatial distribution of shorter-lived •OH and long-lived 1O2 in the macropore channel via a diffusion-reaction kinetic model, which provides fundamental insights into how these two reactive oxygen species work synergistically to offer opportunities for breaking the permeability–reactivity trade-off. Furthermore, the MCM achieved robust and stable removal of total organic carbon for a real high-salinity wastewater, verifying its practical potential for treating refractory organics.
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