Liu Nana,Xu Yunan,Zhan Chenghua,Li Yahe,Yuan Yijun
Uranium extraction from seawater is urgently required for the sustainable development of nuclear industry. Herein, the application potential of Thalassiosira pseudonana adsorbing U(VI) was examined. A 0.3 g L −1 adsorbent dose at an initial uranium concentration of 8 ppm, pH 5.0, and a contact time of 8 h achieved maximum U(VI) adsorption (23.75 mg g −1 ) at 298 K. The adsorption process was a chemisorption phenomenon, characterized by homogeneous monolayer adsorption. The adsorbents exhibited high hydrophilicity, with –OH and –COOH being the main functional groups for uranium adsorption. T. pseudonana had excellent regeneration performance and high sorption selectivity. The research denoted T. pseudonana is an effective and promising sorbent for extracting uranium from seawater.
Muhammad Ibrar,Tao Wang,Yanqing Luo,Yajun Ruan,Shiqinq Zhu,Yue Wu,Shuangfei Li,Ming Ying,Xuewei Yang
Multicomponent heteronanostructures offering catalytic and optical properties have applications across various fields. Photonic crystals (diatom frustules) coated with Au and copper chalcogenide domains represent a unique nanosystem that integrates multiple plasmon resonances from guided-mode resonance, conduction electrons, and valence holes in a single nanoscale system. In this work, we fabricate an enzyme-assisted photonic crystal-enhanced plasmonic nanosystem using a live diatom (Thalassiosira pseudonana) for surface-enhanced Raman scattering (SERS) quantification of sarcosine, an early stage prostate cancer (PCa) biomarker. The biosynthesized heteronanostructure was constructed by coating bimetallic nanoparticles (Au/CuX) on the diatom frustule via a two-stage cultivation process. A silaffin peptide-tagged sarcosine oxidase (SoX) was designed for specific substrate recognition and oriented conjunction. The components were coupled into a single entity (SoX-immobilized Au/CuX-coated frustule, BioNPS) to overcome the interenzyme distance and analyte trade-offs between mass transport. The sarcosine detection by BioNPS outperforms suspended bimetallic nanoparticles and single NP-coated diatom frustules. The improvement is attributed to the coupling of photonic frustule guided-mode resonance to the localized surface plasmonic resonance of bimetallic NPs via both electromagnetic and CT mechanisms. The cascade reaction in close proximity greatly enhances the catalytic efficiency by 5.47-fold compared to the solution-phase assay. The biochem nanosystem precisely detects tiny sarcosine concentration changes in the urine samples of PCa patients and healthy individuals. As a proof of concept, the in vivo fabrication of photonic/plasmonic heterostructures with tunable properties holds great promise for noninvasive biomarker screening.
危险品化学品经营许可证（带存储）