Abstract
A novel adsorbent with magnetic Fe3O4 nanoparticles and melamine-based dendrimer amine functionalized mesoporous silica (MDA–magMCM-48) has been developed which would not destroy the pore structure and could supply a convenient way for separation of the adsorbent from water. The obtained adsorbent was characterized by XRD, SEM, TEM, FTIR, TGA and N2 adsorption–desorption isotherm. The objective of this study was to evaluate the effectiveness of mesoporous MDA–magMCM-48 material for the sorption of 4-chlorophenol (4-CP) and 4-bromophenol (4-BP). The effects of various operating parameters such as initial concentration, pH of the solution and contact time were thoroughly studied. From the sorption studies it is observed that the uptake of 4-CP (239.55 mg/g) was higher than that of 4-BP (222.9 mg/g). The Freundlich and Langmuir adsorption isotherms are used to model the equilibrium adsorption data.
Highlights
Phenols and phenolic compounds are common contaminants in wastewaters generated from various industriesS
The regular pore network of MCM-48 provides more favorable mass transfer kinetics than the unidirectional pore system of MCM-41 leading to a perfect reactor for the synthesis of nanocomposites
The conical flasks were kept on a shaking incubator at ambient temperature (25 ± 2 °C) for 4 h to attain equilibrium
Summary
Phenols and phenolic compounds are common contaminants in wastewaters generated from various industriesS. Box 14335-186, Tehran, Iran such as high-temperature coal conversion, petroleum refining, resins olive oil production and plastics [1] These compounds are toxic, carcinogenic, mutagenic and teratogenic. The regular pore network of MCM-48 provides more favorable mass transfer kinetics than the unidirectional pore system of MCM-41 leading to a perfect reactor for the synthesis of nanocomposites. Modification with ligands, such as amines, carbonates and organosulfides, on the surface of mesoporous materials is necessary to obtain specific adsorption and larger capacity [20, 21]. The presence of free electron pairs on amine group within mesopores of MCM-48
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