A facile thermal decomposition approach for the synthesis of SiO2@ZnS core-shell nanoparticles and their application as effective adsorbent for the removal of congo red

Synthesis of SiO2@MnCo2O4 core–shell nanorattles using layered double hydroxide precursors and studies on their peroxidase-like activity

“…4b) exhibits peaks at 530.2 eV and 531.4 eV due to lattice oxygen of MnCo 2 O 4 and surface hydroxyl oxygen, respectively. 44–46…”

“…The DRS spectra of the MnCo 2 O 4 NPs and SiO 2 @MnCo 2 O 4 nanorattles show broad bands at 250 nm and 470 nm, attributed to O 2À -Mn 2+ and O 2À -Co 3+ charge-transfer transitions of MnCo 2 O 4 , respectively. 43,44 The DRS spectra of all the samples exhibit a broad band at about 738 nm due to d-d transitions of Mn 2+ and Co 3+ of MnCo 2 O 4 NPs. 42,43…”

“…The O 1s spectrum of SiO 2 shows peaks at 532.7 eV and 533.8 eV, indicating the existence of lattice oxygen and surface hydroxyl oxygen in SiO 2 , respectively. 44 Fig. 4(a and b) shows the XPS spectra of pure MnCo 2 O 4 NPs and SiO 2 @Mn-Co 2 O 4 -1.…”