Functionalized magnetic MCM-48 nanoporous silica by cyanuric chloride for removal of chlorophenol and bromophenol from aqueous media

Abstract

A novel adsorbent with magnetic Fe 3 O 4 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 N 2 adsorptiondesorption 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.

Removal of Pb(II) ion from aqueous solution by graphene oxide and functionalized graphene oxide-thiol: effect of cysteamine concentration on the bonding constant

“…So from further experiments, pH 6 was found to be the optimum pH of solution. Like values of optimum pH were reported by some earlier studies for metal ion removal by different adsorbents [25,27].…”

“…In low pH values, hydronium ion was adsorbed more in comparison with Pb(II), whereas hydronium ions have large concentration and high tendencies to be adsorbed on the surfaces [25]. As the value of pH ions from the solution [26][27][28]. Thus, considerable increase in the amount of adsorption and rapid removal of Pb(II) ion takes place in the physiological range of pH, i.e., 6-7.…”

Enhanced removal of nickel(II) ions from aqueous solutions by SDS-functionalized graphene oxide

“…Adsorption technology is currently being applied extensively to the removal of organic and inorganic micropollutants from aqueous solutions, and carbon nanostructures with different morphologies are assumed to be one of the major elements in nanotechnology. [ 55 , 56 ] GO produced is an effective adsorbent for the removal of Ni(II) ions from aqueous solutions and has the potential to be used for the treatment of waste or drinking water. In the literature, there are examples of the modification of GO with organics or metal oxides [ 10 – 15 ] for the removal of metal ions from water.…”

Magnetic Solid-Phase Extraction of Cadmium Ions by Hybrid Self-Assembled Multicore Type Nanobeads

“…The US Environmental Protection Agency (USAEPA) has established a maximum contaminant level of 5 µg/L for cadmium in drinking water, while the World Health Organization (WHO) has set a maximum guideline concentration of 3 µg/L [ 20 ]. To date, several adsorbents, including chitosan-Fe 2 O 3 [ 21 ], sSilica/Fe 3 O 4 [ 22 ], activated carbon/Fe 3 O 4 [ 23 ], magnetic alginate activated carbon (MAAC) beads [ 24 ], graphene/MnFe 2 O 4 [ 25 ] and magnetic ferrite [ 26 ], have been considered for the removal of cadmium ions due to their unique properties such as high surface to volume ratio, surface functionalization, biocompatibility, reversibility and a comparatively low cost. However, there are certain limitations where the separation may require large external magnetic fields if the magnetic iron oxides embedded into composites are too small in size.…”