Synthesis of magnetic iron‐manganese oxide coated graphene oxide and its application for adsorptive removal of basic dyes from aqueous solution: Isotherm, kinetics, and thermodynamic studies

Abstract

Adsorptive removal of cationic dyes such as methyl violet (MV) and methyl green (MG) from aqueous solution using magnetic iron‐manganese oxide coated graphene oxide (IMGO) was examined. The IMGO was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X‐ray spectroscopy, X‐ray diffraction (XRD), N2 adsorption–desorption isotherm, and vibrating sample magnetometer. The effect of different process parameters such as contact time, IMGO dose, initial dyes concentration, initial solutions pH, and temperature was investigated. The equilibrium experimental data were fitted with Langmuir, Freundlich, Dubinin–Radushkevich (D‐R), and Temkin isotherm models. The data fitted well with Freundlich isotherm model suggesting multilayer adsorption of dyes onto heterogeneous adsorbent surface. The Langmuir adsorption capacity (Qm, mg/g) of IMGO with MV and MG was 172.96 and 195.64, respectively. The data obeyed the pseudo‐second order kinetic model, and the mechanism of adsorption was controlled by both intra‐particle and liquid film diffusion models. The adsorption process was found to be spontaneous, endothermic, and physical in nature. The dye‐loaded IMGO was regenerated and used for at least four cycles without any substantial loss of its efficacy. The present adsorptive removal studies of MV and MG revealed that IMGO is an effective and efficient adsorbent for the removal of basic dyes from aquatic system. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S214–S229, 2019

Synthesis and application of ferromagnetic graphene oxide nanocomposite as an effective adsorbent for Clonazepam: Batch experiments, modeling, regeneration, and phytotoxicity

“…It is also worth noticing that the mGO did not have any toxicity effect on seeds, suggesting that the nanomaterial is safe for application in water and wastewater treatment. Unlike what occurs with pristine graphene oxide in water, which, even at low concentrations, can cause phytotoxicity in cabbage, tomatoes, red spinach, and lettuce [37]. As in this study, Fraga et al [26] did not observe inhibitory effects when using an iron-based GO adsorbent in the treatment of textile effluents, as the seeds of Lactuca sativa L. presented a growth of 95% of the seeds at different dilutions.…”

Fabrication of Flexible Graphene Paper/MnO2 Composite Supercapacitor Electrode through Electrodeposition of MnO2 Nanoparticles on Graphene Paper

“…[13] In recent years, graphene/ manganese dioxide composite electrode materials have be-come a hot point for seeking superior supercapacitive performance. [14][15][16][17] Graphene, a hexagonal honeycomb lattice composed of sp 2 hybrid carbon atoms, [18] is a new but very competitive candidate for electroactive carbon electrode material, [19] due to its excellent electrical conductivity, [20,21] mechanical strength [22] and specific surface area. [23] So far, the fruitful scientific research results have confirmed its potential application as electrode materials in solar cells, [24] secondary batteries, [25] and supercapacitors.…”

“…Therefore, to avoid the shortcomings of single kind of material, it is feasible to develop high‐performance composite electrode materials by using the synergistic effect of electrode materials based on different energy storage mechanisms [13] . In recent years, graphene/manganese dioxide composite electrode materials have become a hot point for seeking superior supercapacitive performance [14–17] …”

High adsorption of methylene blue from water onto graphenic materials: Effect of degree of graphitization and analysis of kinetic models

“…produce colored effluents, which require a prior treatment before their discharge into water sources 2 . The presence of dyes in water bodies can generate problems such as the reduction of the photosynthetic activity of the aquatic flora due to the dyes obstructing the passage of solar light through the water 3,4 . In humans, dyes can cause damage to the central nervous system, reproductive system, and kidney dysfunction.…”

“…2 The presence of dyes in water bodies can generate problems such as the reduction of the photosynthetic activity of the aquatic flora due to the dyes obstructing the passage of solar light through the water. 3,4 In humans, dyes can cause damage to the central nervous system, reproductive system, and kidney dysfunction. Many dyes are toxic and, in some cases, can be carcinogenic, being made of aromatic compounds such as benzidine.…”