Facile fabrication of Fe 3 O 4 /MIL-101(Cr) for effective removal of acid red 1 and orange G from aqueous solution

Nistor

et al. 2018

Journal of Chemistry

This work develops a methodology for selective removal of industrial dyes from wastewaters using adsorption technology based on magnetic adsorbents. The magnetic nanoparticles embedded within a matrix of activated carbon were tested as adsorbents for removal of industrial dyes from aqueous solutions. The effects of four independent variables, solution pH, initial concentration of pollutant, adsorbent dose, contact time, and their interactions on the adsorption capacity of the nanocomposite were investigated in order to optimize the process. The removal efficiency of pollutants depends on solution pH and increases with increasing the carbon content, with initial concentration of the pollutants, the temperature, and the dose of magnetite/carbon nanocomposites. Pseudo-second-order kinetic model was fitted to the kinetic data, and adsorption isotherm analysis and thermodynamics were used to elucidate the adsorption mechanism. The maximum adsorption capacities were 223.82 mg g −1 for Nylosan Blue, 114.68 mg g −1for Chromazurol S, and 286.91 mg g −1 for Basic Red 2. The regeneration and reuse of the sorbent were evaluated in seven adsorption/desorption cycles. The optimum conditions obtained for individual adsorption were selected as starting conditions for simultaneous adsorption of dyes. In binary systems, in normal conditions, selectivity decreases in the order: Red Basic 2 > Nylosan Blue > Chromazurol S.

Section: Kinetics Studiessupporting

confidence: 72%

Removal of Colored Organic Pollutants from Wastewaters by Magnetite/Carbon Nanocomposites: Single and Binary Systems

Nistor

et al. 2018

Journal of Chemistry

Beilstein J. Nanotechnol.

“…Based on the remarkable performance of KOH-900 in the adsorption of AR1 and JGB, the performance of KOH-900 PDC was compared with earlier results, as shown in Table 1 [44,[67][68][69][70][71][72] and Table 2 [73-77] for AR1 and JGB, respectively. As summarized in Table 1, KOH-900 had a Q 0 value (for AR1) 8.1 times that of commercial, activated carbon.…”

Section: Competitiveness Of Koh-900 In Adsorption Of Dyesmentioning

confidence: 99%

“…Herein, we utilized PDC, prepared especially at high temperature, for the purification of water contaminated with dyes, such as acid red 1 (AR1), Janus green B (JGB), methyl orange (MO) and methylene blue (MB), via adsorption. AR1 is a large anionic dye which is toxic and widely applied in the paper industry [44]. Janus green B (JGB) is one of the most typical large cationic dyes that is widely used in several industries [42].…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of bulky dye molecules from water with mesoporous polyaniline-derived carbon

Park

Khan

et al. 2020

Polyaniline-derived carbon (PDC) was obtained via pyrolysis of polyaniline under different temperatures and applied for the purification of water contaminated with dye molecules of different sizes and charge by adsorption. With increasing pyrolysis temperature, it was found that the hydrophobicity, pore size and mesopore volume increased. A mesoporous PDC sample obtained via pyrolysis at 900 °C showed remarkable performance in the adsorption of dye molecules, irrespective of dye charge, especially in the removal of bulky dye molecules, such as acid red 1 (AR1) and Janus green B (JGB). For example, the most competitive PDC material showed a Q 0 value (maximum adsorption capacity) 8.1 times that of commercial, activated carbon for AR1. The remarkable adsorption of AR1 and JGB over KOH-900 could be explained by the combined mechanisms of hydrophobic, π-π, electrostatic and van der Waals interactions. 597

Chemistry An Asian Journal

“…The biggest advantage of this preparation method is its high applicability, which is used for almost all MOFs. In addition, another method is to first synthesize the desired MOFs and then disperse it in a mixture containing the reagents used to prepare the MNPs . MNPs growth was carried out in the presence of MOF crystals.…”

Section: Preparation Magnetic Framework Compositesmentioning

confidence: 99%

“…Therefore, it is difficult to accurately control the molar ratio of the Fe II and the Fe III at 1:2 and impurity phase would exist in the final product . Inspired by Cao and co‐workers who reported the reduction‐precipitation method to prepare magnetic Fe 3 O 4 /chitosan nanoparticles, Wang et al . successfully produced Fe 3 O 4 /MIL‐101(Cr) by the novel in situ reduction‐precipitation method.…”

Section: Preparation Magnetic Framework Compositesmentioning

confidence: 99%

Recent Advances in Preparation and Applications of Magnetic Framework Composites

Yao

Jiang

2019

Metal-organic frameworks (MOFs)o ffer ample characteristics, such as easy synthesis, high surface area, tunable porosities, open metal sites, post-synthesis modification, making them attractive for diverse applications. Since magnetic particles can be positioned and separated by a magnetic field, magnetic framework composites (MFCs)h ave attracted tremendous attention.I nt his review,d ifferent methods of preparingM FCs, including direct mixing, in-situ growth of magnetic particles, embedding method, layer-bylayer growth method and encapsulationm ethod, will be discussed in detail. Moreover,t heir applications in catalysis, adsorption, biomedicine and sensing will also be introduced.