FeS nanoparticles-anchored mesoporous silica microspheres for efficient remediation in adsorbing and detoxifying U(VI) and Cr(VI)

In this work, FeS was anchored on mesoporous silica microspheres (SiO 2 200, SiO 2 500, and SiO 2 1000), and named as FeS@SiO 2 (i.e., FeS@SiO 2 200, FeS@SiO 2 500, FeS@SiO 2 1000), in adsorbing and detoxifying U(VI)/Cr(VI) from wastewater. Results demonstrated that FeS@SiO 2 exhibited higher efficiency towards U(VI)/Cr(VI), outperforming FeS and SiO 2 alone. Kinetic investigations revealed that adsorption of U(VI)/Cr(VI) followed pseudo–second–order model best, highlighting effective chemical interplay. XPS investigations demonstrated multi–species which was included FeS, Fe(II), S 2− and polysulfide (S 2 2− , S n 2− ) could be employed as reductants for U(VI)/Cr(VI) adsorption. The combination of SiO 2 and FeS offered an enhanced efficiency for U(VI)/Cr(VI), making these composites promising materials in water purification. Graphical