Mesoporous magnetic secondary nanostructures as versatile adsorbent for efficient scavenging of heavy metals

Abstract

Porous magnetic secondary nanostructures exhibit high surface area because of the presence of plentiful interparticle spaces or pores. Mesoporous Fe3O4 secondary nanostructures (MFSNs) have been studied here as versatile adsorbent for heavy metal scavenging. The porosity combined with magnetic functionality of the secondary nanostructures has facilitated efficient heavy metal (As, Cu and Cd) remediation from water solution within a short period of contact time. It is because of the larger surface area of MFSNs due to the porous network in addition to primary nanostructures which provides abundant adsorption sites facilitating high adsorption of the heavy metal ions. The brilliance of adsorption property of MFSNs has been realized through comprehensive adsorption studies and detailed kinetics. Due to their larger dimension, MFSNs help in overcoming the Brownian motion which facilitates easy separation of the metal ion sorbed secondary nanostructures and also do not get drained out during filtration, thus providing pure water.

Morin Flavonoid Adsorbed on Mesoporous Silica, a Novel Antioxidant Nanomaterial

“…The function that expresses the magnitude of the retention and behavior of a molecule on a solid surface once the equilibrium of adsorption/desorption phenomena have been reached, it can be described from the relationship between the remaining concentration of a molecule with the concentration or amount of the same compound retention on the surface at constant temperature, this relationship is commonly known like as Adsorption Isotherm [44, 63]. …”

Highly Porous MOF Adsorbent for Wastewater Treatment

“…The maximum adsorption capacity value calculated for Cd-H4bta was 183.43 mg/g in the removal of Cu(II) ions. This is a significant threefold improvement over and above other recently reported MOF adsorbents such as MOF-MIL-Fe, MOF-NC and chitosan-MOF considered good adsorbents for Cu(II) ion adsorption [31][32][33]. MOF-MIL-Fe with an adsorption capacity of (135.0 mg/g) possess a lower (q e ) compared to Cd-H 4 bta.…”

Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

“…In the next step, with gradual occupation of these sites, the adsorption efficiency started to decrease. 21 Rapid adsorption can be attributed to the mutual attraction between the negatively charged surface of the adsorbent and positively heavy metal ions. With the increasing time, the repulsive forces between the heavy metal ions, (lead and cobalt) lead to a slow down in the adsorption process.…”

“…With the increasing time, the repulsive forces between the heavy metal ions, (lead and cobalt) lead to a slow down in the adsorption process. 21,22 Another important parameter in the metal ion adsorption process is the temperature. 23 The percentage removal was decreased with the increasing temperature.…”