Three-Dimensional Porous Spinel Ferrite as an Adsorbent for Pb(II) Removal from Aqueous Solutions

Abstract

Application of porous magnetic materials for detoxification of pollutants from aqueous solutions has attracted great attention in recent years because of their ease of separation and enhanced efficiency. In this light, a three-dimensional (3D) porous NiFe 2 O 4 adsorbent (PNA) having significant magnetic properties was synthesized and employed in detoxification of Pb(II) contaminated aqueous solution. The PNA was obtained by a sol−gel process using chitosan as precursor and was fully characterized by using FTIR, XRD, SEM, and EDAX analytical techniques. The surface morphology obtained from the SEM images of the PNA clearly exhibited the three-dimensional porous structure; pores were well interconnected. The kinetic mechanism was best described by pseudo-second-order and double-exponential models. The equilibrium state sorption data was best fitted to the Langmuir and Sips isotherm models. The studies clearly demonstrated that the PNA could be an efficient material for treatment of Pb(II) contaminated wastewaters.

Green Synthesis of Magnetic EDTA- and/or DTPA-Cross-Linked Chitosan Adsorbents for Highly Efficient Removal of Metals

“…The C id values present the boundary layer thickness, where the larger the C id value is, the thicker the boundary layer is. 35 As shown in Table S2 of the Supporting Information, MEDCS had relatively higher C id values than MDTCS, indicating the greater boundary layer thickness on MEDCS. This might also be attributed to the higher functional group coverage of MEDCS than MDTCS.…”

“…34 Therefore, the knowledge of an optimum pH is important for maximum removal of the target metals. 35 The effect of pH was studied at a metal concentration of 0.8 mmol L −1 under pH ranging from 1 to 6, and the results are presented in Figure 4. Alkaline solutions were not used in order to avoid the formation of metal hydroxides (Visual MINTEQ ver.…”

Enhanced Adsorption Removal of Pb(II) and Cr(III) by Using Nickel Ferrite-Reduced Graphene Oxide Nanocomposite

“…25 22.94 Diatomaceous earth clay (DAT) [21] 19.608 14.225 DAT-Hexadecyltrimethylammonium Bromide [21] 24.271 22.779 GO [22] -92.65 Lonicera japonica flower powder [23] 19.61 -Porous NiFe 2 O 4 [24] 48.98 -Celtek clay [25] 18 …”

Monolithic supermacroporous hydrogel prepared from high internal phase emulsions (HIPEs) for fast removal of Cu 2+ and Pb 2+

“…Recently, porous materials have sparked remarkable interests as the adsorbents due to their high surface area, large pore volume, regular pore size and interconnected frameworks in addition to good chemical and physical stabilities [14][15][16][17][18][19][20][21][22]. With interconnected and well-defined meso-(2-50 nm) and macro-pores (>50 nm), the porous materials are particularly useful for applications that involve large molecules due to enhanced diffusion rates inside large pores and the associated enhanced activity of the pores to reactants.…”