Effective impregnation for the preparation of magnetic mesoporous carbon: application to dye adsorption

Abstract

BACKGROUND In this study, magnetic mesoporous activated carbons were synthesized either via co‐precipitation of iron salts onto activated carbon or via impregnation of activated carbon with magnetic nanoparticles by sonication. The resulting impregnated carbons were examined as adsorbents for the removal of Reactive Black 5 (RB5) from aqueous solutions. RESULTS The magnetic nanocomposites were characterized by various techniques (nitrogen adsorption, Fourier transform infrared spectroscopy, X‐ray diffraction, vibrating sample magnetometry, and scanning electron microscope measurements). The results of characterization analyses revealed that co‐precipitation was unsuccessful for the preparation of magnetic carbon while sonication led to a super‐paramagnetic activated carbon. Adsorption studies revealed that although magnetic carbon presented a decreased adsorption capacity compared with raw carbon, it was an acceptable dye adsorbent. High pH and high ionic strength values favored dye adsorption, while the data of adsorption isotherms and kinetics were better fitted by the Freundlich isotherm model and the pseudo‐second‐order kinetic model, respectively. Regeneration of dye‐loaded activated carbons by thermal re‐activation and re‐use of regenerated samples were also investigated. CONCLUSION Mesoporous magnetic activated carbon, with a saturation magnetization of 18 emu g−1, was successfully synthesized by sonication of activated carbon and magnetite nanoparticles. The magnetic carbon was found to be an adequate dye adsorbent with a maximum adsorption capacity of 445.294 mg g−1. © 2017 Society of Chemical Industry

Silk Fibroin Nanoparticles for Drug Delivery: Effect of Bovine Serum Albumin and Magnetic Nanoparticles Addition on Drug Encapsulation and Release

“…The 2θ diffraction peak presented in the XRD pattern of the magnetic silk fibroin nanoparticles (Figure 6a), that appeared at 2θ = 19.2 • , could be attributed to silk I, a random coil of silk fibroin, while for the encapsulated-with-propranolol magnetic silk fibroin nanoparticles, the characteristic peak at 2θ = 20.7 • could be attributed to silk II, a β-sheet of fibroin. In addition, diffraction peaks corresponding to the (3 1 1), (4 0 0), and (4 4 0) planes of the cubic crystal structure (fcc) of Fe 3 O 4, show the formation of magnetic silk fibroin nanoparticles [19]. The aforementioned XRD results are in agreement with the FTIR results.…”

“…The Fe 3 O 4 nanoparticles were prepared according to the modified Massart method [19] For the preparation of the magnetic silk fibroin nanoparticles (SFm-NPs), 0.1 g Fe 3 O 4 was added to 5 mL of silk fibroin solution followed by the preparation of nanoparticles as above described.…”

The utilization of leaf-based adsorbents for dyes removal: A review

“…Fourier transform infrared spectroscopy is a vibrational spectroscopic technique usually used to identify functional groups present in leaf-based adsorbents surface that could be possibly be involved during the interactions/adsorption of the dyes [45,46]. Zhu et al investigated the presence of functional groups on the Water Bamboo Leaves (WBL) by FTIR spectroscopy [47].…”

One-pot synthesis of S-doped Fe2O3/C magnetic nanocomposite as an adsorbent for anionic dye removal: equilibrium and kinetic studies

“…Among these methods, adsorption is the most convenient and promising strategy due to the easy operation, high efficiency, low energy requirement, and easy recovery or reuse of the adsorbent [10,13]. Compared to other adsorbents for dye removal, magnetic materials possessed many advantages such as chemical stability, nontoxic synthesis, environmentally friendly, low cost and facile separation from the water solution [14,15].…”