Abstract
Magnetic carbon materials as adsorbents for dye removing have attracted increasing attention because of their magnetic separation feature. However, the immobilization of large magnetic particles on a carbon matrix greatly decreases the available sites for adsorption, resulting in a low adsorption capacity. The synthesis of magnetic carbon materials as adsorbents for dye adsorption with high adsorption capacity remains challenging. Herein, porous carbon (PC) was firstly synthesized through the calcination of macroporous acrylic type cation exchange resin. The as-prepared PC was applied as a matrix to deposit nano-sized Fe3O4 nanoparticles (MPC) via a facile one-pot solvothermal strategy. The nano-sized Fe3O4 nanoparticles (5.19 nm in diameter) are uniformly distributed on the PC surface. The MPC possesses an exceptional performance for methylene blue removal (qe = 214.4 mg g−1) at room temperature, outperforming most previous magnetic carbon adsorbents. The large surface area of the MPC originated from the combined advantages of PC and nano-sized Fe3O4 must be ascribed to the high performance of MPC composite toward methylene blue adsorption.
Highlights
Organic dyes are useful chemicals, which are widely applied in industry including textiles, paper, plastics, tannery, and paints, etc. [1]
The adsorption tests were performed at different pH ranging from 3 to 11 to study the corresponding changes in adsorption capacity of methylene blue (MB) on matrix to deposit nano-sized Fe3O4 nanoparticles (MPC)
The microstructural morphology of the MPC was determined by TEM
Summary
Organic dyes are useful chemicals, which are widely applied in industry including textiles, paper, plastics, tannery, and paints, etc. [1]. Various materials have been investigated as adsorbents for treating dye pollutants, among which carbon materials have shown good adsorption performance because of their superior characteristics of large surface areas and structure properties. Magnetic materials have shown promise as adsorbents for remedying environmental pollutions from organic dyes because of the remarkable feature of magnetic separation compared with the abovementioned methods [9,10,11]. The separation problem was effectively overcome, the removal efficiency was not satisfied enough because of the low surface area of reduced graphene oxide(RGO) produced. Sci. 2019, 9, 2898 was not satisfied enough because of the low surface area of reduced graphene oxide(RGO) produced by a chemical oxidation–exfoliation–reduction process and the relatively large particle size of Fe3O4. The recovery of the adsorbent from the aqueous solution and used for the adsorption experiment
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