Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Abstract

This work aims to provide a facile method for the preparation of Mn‐doped hematite microrods and reveals the relationship between Mn doping and the enhanced adsorption properties. The adsorption performance of hematite could be greatly enhanced by Mn doping. The maximal adsorption capacity of the Mn‐doped α‐Fe2O3 is calculated to be 84.54 mg/g, which exhibits obviously enhanced adsorption capacity as compared to the un‐doped α‐Fe2O3 (33.02 mg/g). To further understand the adsorption process, the adsorption kinetic as well as thermodynamic behaviors are carefully investigated. The results suggest that the adsorption process of CR onto the adsorbents follows the pseudo‐second‐order kinetic model. Meanwhile, the adsorption process can be designated to be a Langmuir process. The adsorption capacities of CR vary as a function of Mn contents, which are regarded as the synergistic effect between surface areas and pore sizes.

Facile Microwave Hydrothermal Synthesis of ZnFe2O4/rGO Nanocomposites and Their Ultra-Fast Adsorption of Methylene Blue Dye

“…Figure 8 and Table 5 present the fitting plots and calculated parameters of Langmuir, Freundlich, and Temkin isotherms for the various materials. Similar to the adsorption kinetics discussed earlier, the correlation coefficient (R 2 ) is an important parameter in determining the models that are optimal for describing the ZFG adsorption process [ 100 , 101 ]. The R 2 values (R 2 > 0.96) of the Langmuir model for all various samples were higher than Freundlich and Temkin isotherms.…”

Enhanced Magnetic Properties of Iron Oxide Nanoparticles Encapsulated in Cobalt Nanopowder Derived from Sunur-Pariaman Beach Sand

“…In order to enhance the degradation efficiency, some researchers [12] used transition metals as doping elements into magnetite nanoparticles. Manganese element has been used by other researchers [13] as a doping element to improve the degradation efficiency of magnetite nanoparticles. Furthermore, high degradation efficiency of methylene blue has been observed by other researcher [14] using cobalt doped magnetite nanoparticles that significantly increase the OH radicals.…”