Crystal evolution of nano-sized CoCr2O4 synthesized by a modified sol–gel method

Spinel Phase Engineering Boosted Visible-Light Photocatalytic Activity in Co1–xSrxCr2O4

“…Figure c displays the Cr 2p spectra with two main peaks around 586.9 and 577.1 eV due to the splitting of Cr 2p 1/2 and Cr 2p 3/2 of Cr 3+ , respectively . However, the position of both Cr 2p 1/2 and Cr 2p 3/2 peaks of CSC2 and CSC3 samples shifts toward the higher energy side, indicating the conversion of CrO 6 units to CrO 4 units, similar to the observed behavior in CoO 4 and CoO 6 .…”

“…In the quest to eliminate deadly contaminants like ofloxacin (OFL), photocatalysis has emerged as a highly efficient, eco-friendly, easily handled, and cost-effective method for degrading organic pollutants. , Spinel CoCr 2 O 4 (space group Fd3m ) shows good magnetic and photonic behaviors and is sensitive to the cation concentration and coordination states of the crystal lattice. , For example, in contrast to the spinel phase, inverse spinel CoCr 2 O 4 has half of Cr 3+ filling octahedral positions, and all Co 2+ ions occupy octahedral positions, , providing the possibility to tailor the photocatalytic performance through phase transition . In addition, inverse spinel CoCr 2 O 4 displays higher polarization and magnetic anisotropy in the lattice due to an asymmetric charge distribution within the crystal structure, which facilitates easy catalyst recovery via an external magnetic field, enhancing photocatalytic activity and effectively eliminating nanoparticle aggregation at the same time …”

Designing of Z‐Scheme MgFe2O4/Fe2O3 Coupled CoCr2O4 Heterojunction with High Photocatalytic Activity for the Removal of Tetracycline Hydrochloride in Wastewater

“…The average binding energy difference of 2p 1/2 and 2p 3/2 of Co 2+ is about 15.03 eV, which is basically consistent with the literature reports. [ 46 ] The XPS results confirm that the MFO/wt%CCO composites contain only Mg, Fe, O, Co, Cr, and C, and no other impurity elements appear in MFO/wt%CCO composites.…”

“…[43,45,26] In addition, additional peaks in the O 1s spectra of the MFO/wt%CCO composites at 528.8-529.0 eV belong to the lattice oxygen of CCO. [46] Table 1 shows the O 1s binding energy of MFO and MFO/wt%CCO composites. XPS results show that the MFO and MFO/wt%CCO composites synthesized by the solution combustion method combined with the mechanical mixing method can introduce adsorbed oxygen, and such oxygen vacancy defects can affect the photocatalytic performance of the photocatalyst.…”

Deep red emission from rare-earth-free calcium aluminozincate phosphor with the substitution of Cr3+ ion

“…For the synthesis of the Cr 3+ -doped calcium aluminozincate phosphor, the sol-gel technique is followed as it is a low temperature synthesis technique that provides the facility of controlling parameters during the reaction process. 21,22 Moreover, the morphology is improved with the low temperature synthesis technique in comparison with the solid-state reaction technique. This results in better luminescent properties of the prepared phosphors.…”