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A porous silica-polymer-based adsorbent,isoBu-BTP/SiO2-P,was prepared by a vacuum impregnation method and used for the recovery of ruthenium,rhodium,and palladium from nitric acid solution.The experimental results revealed that isoBu-BTP/SiO2-P exhibited unique adsorption properties such as high saturation adsorption capacity (Ru: 0.35 mmol g-1,Rh: 0.32 mmol g-1,Pd:1.05 mmol g-1) and excellent selectivity over other metal ions,such as lanthanides (SFPGM/M>40) in 1 M HNO3 solution.The adsorption process conformed to the pseudosecond-order model and Langmuir model.From the UV,FTIR,and XPS analyses,it can be concluded that the strong affinity between functional groups (C–N=C) and metal ions as well as NO3 - played a role in coordination during the adsorption process.Furthermore,the desorption behavior was studied,and it was found that the adsorbed Pd,Rh,and Ru could be eluted with a 0.01 M nitric acid–0.1 M thiocarbamide solution,5 M hydrochloric acid,and sodium hypochlorite (CP) solution,respectively.Finally,based on those findings,a simple process for the separation and recovery of Pd,Rh,and Ru from high-level liquid waste using isoBu-BTP/SiO2-P was designed and proposed.