Here,we introduce a new p H-responsive optical nanosensor designed for precise detection and selective uptake of Pd^(2+)ions from wastewater and urban mining sites.Our approach focuses on creating silica nano-sphere m...Here,we introduce a new p H-responsive optical nanosensor designed for precise detection and selective uptake of Pd^(2+)ions from wastewater and urban mining sites.Our approach focuses on creating silica nano-sphere mesostructure-based nanosensor(MSNS-OYS)through a simple and reproducible synthesis method by directly immobilizing disodium 6-hydroxy-5-[(4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate(orange yellow S;OYS)chelate onto mesoporous silica nano-spheres(MSNS)carriers.We exploited the inherent surface properties and active acid sites of silica to facilitate stable interactions with the OYS chelate[OYS-Pd]^(n+),ensuring the integrity of the sensor during Pd^(2+)sensing assays as evidenced by N_(2)adsorption/desorption,FT-IR,SEM,HR-TEM,XPS,and elemental analyses.The nano-sized MSNS-OYS has large surface-tovolume ratios with a surface area of 686 m^(2)/g and a pore volume of 0.0925 cm^(3)/g.Adsorption capacity reaches 70.8 mg/g at pH 2.Fast mass transfer properties allow the equilibrium to be reached within 30 min.This method yields a sensitive sensor capable of detecting Pd^(2+)ions down to a limit of detection(LOD)of 11.6μg/L and a limit of quantification(LOQ)of 38.6μg/L,off ering stability,selectivity,and sensitivity.Additionally,the sensor can be easily regenerated by treatment with thiourea acidifi ed with 0.05 M HNO3.展开更多
基金funded by the University of JeddahJeddah+2 种基金Saudi Arabiaunder grant No.UJ-23-DR-155the University of Jeddah for its technical and financial support。
文摘Here,we introduce a new p H-responsive optical nanosensor designed for precise detection and selective uptake of Pd^(2+)ions from wastewater and urban mining sites.Our approach focuses on creating silica nano-sphere mesostructure-based nanosensor(MSNS-OYS)through a simple and reproducible synthesis method by directly immobilizing disodium 6-hydroxy-5-[(4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate(orange yellow S;OYS)chelate onto mesoporous silica nano-spheres(MSNS)carriers.We exploited the inherent surface properties and active acid sites of silica to facilitate stable interactions with the OYS chelate[OYS-Pd]^(n+),ensuring the integrity of the sensor during Pd^(2+)sensing assays as evidenced by N_(2)adsorption/desorption,FT-IR,SEM,HR-TEM,XPS,and elemental analyses.The nano-sized MSNS-OYS has large surface-tovolume ratios with a surface area of 686 m^(2)/g and a pore volume of 0.0925 cm^(3)/g.Adsorption capacity reaches 70.8 mg/g at pH 2.Fast mass transfer properties allow the equilibrium to be reached within 30 min.This method yields a sensitive sensor capable of detecting Pd^(2+)ions down to a limit of detection(LOD)of 11.6μg/L and a limit of quantification(LOQ)of 38.6μg/L,off ering stability,selectivity,and sensitivity.Additionally,the sensor can be easily regenerated by treatment with thiourea acidifi ed with 0.05 M HNO3.
