Zero valent cobalt impregnated silica nanoparticles for the sanitation of contaminated water

• DOI: 10.1002/ep.12913
• Publication Date: 2018-05-05T05:57:25Z
• Authors: Nivedita Shukla; Vatsana Gupta; Deepak Kumar Pal; Ashok Singh Rawat; Amit Saxena; Sarita Shrivastava; Pramod Kumar Rai
• Keywords: Langmuir adsorption model; Physisorption; Endothermic process

Cobalt impregnated silica nanoparticles (Co–SiO 2 ) were synthesized via one pot method involving supercritical drying followed by in‐situ reduction. The prepared characterized nitrogen‐Brunauer Emmett Teller (N ‐BET) isotherm studies, X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM), zeta particle size analyzer and vibrating sample magnetometer (VSM) techniques. Co–SiO evaluated for adsorptive removal of methylene blue (MB), trinitrotoluene (TNT), mercury ions [Hg (II)]. equilibrium adsorption data analyzed using Langmuir, Freundlich Dubinin–Radushkevich (D–R) models. Adsorption MB Hg(II) best fitted Langmuir model depicting their homogenous monolayer with maximum capacity 250 40.24 mg/g, respectively, while TNT was indicating a heterogeneous 20.49 mg/g capacity. mean energy calculated through D–R indicated physisorption all the three contaminants adsorbent. Thermodynamic studies showed that these spontaneous endothermic process increased randomness at solid/solution interface. magnetic Co/SiO easily separated after help magnet reusability upto cycles without much loss in efficiency. © 2018 American Institute Chemical Engineers Environ Prog, 38: S42–S53, 2019