Synthesis of Silica@Ni‐Co Mixed Metal Oxide Core–Shell Nanorattles and Their Potential Use as Effective Adsorbents for Waste Water Treatment. Issue 25 (7th August 2015)

• Record Type: Journal Article
• Authors: Kandula, Syam; Jeevanandam, Pethaiyan
• Is Part Of: European journal of inorganic chemistry. Issue 25(2015)
• Page Start: 4260
• Page End: 4274
• Publication Date: 2015-08-07
• Subjects: Nanoparticles -- Nanorattles -- Layered compounds -- Mixed metal oxides -- Adsorption -- Waste prevention; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201500444
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles with different Ni 2+ /Co 2+ molar ratios have been successfully synthesized through a facile, inexpensive self‐template route by the calcination of SiO2 @Ni‐Co layered double hydroxides at 500 °C. The formation of SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles has been confirmed by an array of characterization techniques. Field‐emission scanning electron microscopy (FE‐SEM) analysis indicates a hierarchical flowerlike morphology for the SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles, and transmission electron microscopy (TEM) analysis confirms the formation of core–shell nanorattles. The diffuse reflectance spectra of the SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles show two band‐gap absorptions attributed to metal‐to‐ligand charge‐transfer transitions (M n + →O 2– ). The SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles have been explored as effective adsorbents for the removal of rhodamine B, methylene blue, and their mixture from aqueous solutions. The adsorption of the single dye systems follows Langmuir and Freundlich isotherms, whereas a binary Langmuir model has been applied for the binary dye systems. The SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles possess higher adsorption capacity for the individual dyes than for the mixture of dyes. Kinetic studies indicate that the adsorptions of rhodamine B, methylene blue, and their mixture follow pseudo‐second‐order kinetics. Abstract : SiO2 @Ni‐Co mixed metal oxide core–shell nanorattles are synthesized by the calcination of SiO2 @Ni‐Co layered double hydroxides at 500 °C. The nanorattles are explored as effective adsorbents for the removal of mixtures of rhodamine B and methylene blue from an aqueous solution. The nanorattles exhibit better adsorption capacity than the individual metal oxides.