Abstract
Background: Although pristine and modified manganese oxides were used as adsorbent for dyes removal from aqueous solutions, their applications were limited to the removal of single dye components. From the practical viewpoint, it is necessary to investigate the adsorption behavior of dyes on manganese oxide adsorbents in multi-component systems. Herein, the present work investigated the performance of core-shell magnetic manganese dioxide (Fe3O4/C/MnO2) nanocomposites as an adsorbent to remove methylene blue (MB) and rhodamine B (RhB) in single and binary dye solutions.
Method: Fe3O4/C/MnO2 microspheres were prepared using the redox reaction of KMnO4 to MnO2 in alkaline solution on the surface of carbon-coated magnetite (Fe3O4/C). The effect of pH and adsorbent amount on adsorption was examined, and the adsorption isotherms and kinetics of MB and RhB in single and binary dye solutions were studied.
Results: In single dye solutions, the adsorption isotherms of both MB and RhB fitted well with the Langmuir model. In binary dye solution, the adsorption amount of MB increased because of the synergetic effect, while the adsorption amount of RhB decreased due to competitive effect. The adsorption isotherms of MB and RhB in binary dye solution followed the Sheindorf-Rehbun-Sheintuch (SRS) and extended Langmuir model, respectively. Both MB and RhB adsorption could be expressed by the pseudo-second-order kinetic model in single or binary dye solutions.
Conclusion: Fe3O4/C/MnO2 nanocomposites exhibited an excellent adsorption property to MB and RhB and high magnetic separability.
Keywords: Fe3O4/C/MnO2 nanocomposites, methylene blue, rhodamine B, adsorption, redox reaction, binary dye solutions.
Graphical Abstract
Call for Papers in Thematic Issues
Role of nanomaterials in fabrication of coatings, Machining and Joining
The application of nanoscience has brought about a revolution in the field of mechanical engineering by providing novel materials, boosting manufacturing processes, and generating cutting-edge products. The purpose of this special issue is to investigate the enormous impact that nanoscience has had on mechanical engineering, with a particular emphasis on ...read more
Advanced Inorganic Nanocomposites and Their Emerging Applications
This special issue collection will highlight developments on the recent trends about the synthesis of metal oxides, nanoclusters, biomaterials, 2D nanomaterials, nanocrystals, nanocomposites, etc. and their applications in electrochemical systems, tissue regeneration, energy storage and harvesting, sensors, etc. The novelty of the methods in the chemical synthesis and their characterizations, ...read more
Applicability of Nanotechnology for Performance Enhancement of Clean Energy Technologies
Population growth, industrialization, and improvement in living quality would lead to further increase in energy demand in near future. Regarding the disadvantages of fossil fuels such as fluctuations in their price, high emissions of greenhouse gases and restriction of their sources, it is crucial to use and exploit alternative energy ...read more
Graphene and 2D Materials for Energy Storage and Conversion
This thematic issue will discuss the recent advances in graphene-based nanomaterials for different energy technologies. Graphene possesses a high surface area, and stable structure and exhibits many interesting electronic, optical, and mechanical properties due to its 2D crystal structure. Graphene is of both fundamental interest and suitable for a wide ...read more
Related Books
Nanoscale Field Effect Transistors: Emerging Applications
Nanoelectronics Devices: Design, Materials, and Applications Part II
Nanoelectronics Devices: Design, Materials, and Applications (Part I)
Role of Nanotechnology in Cancer Therapy
Synthesis and Applications of Semiconductor Nanostructures
Pathways to Green Nanomaterials: Plants as Raw Materials, Reducing Agents and Hosts
Applications of Nanomaterials in Medical Procedures and Treatments
Synthesis of Nanomaterials
Nanobiotechnology: Principles and Applications
Bio-Inspired Nanotechnology
45
2
1
1