Removal of Pb(ii) and Cr(vi) from aqueous solutions using the prepared porous adsorbent-supported Fe/Ni nanoparticles

Abstract

In this study, Fe/Ni nanoparticles supported by a novel fly ash-based porous adsorbent (FBA-Fe/Ni) for Cr(vi) and Pb(ii) removal were investigated.

Portable SA/CMC entrapped bimetallic magnetic fly ash zeolite spheres for heavy metals contaminated industrial effluents treatment via batch and column studies

“…It might be driven by the fact that the functional groups on the adsorbent were easily protonated and were positively charged at low pH, making the SA/CMC-ZFN ideal for the adsorption of negatively charged HCrO4 − . Furthermore, the reduction of Cr(VI) to Cr(III) by Fe 0 was highly reliant on the pH of the solution because hydronium ions encourage Fe 0 corrosion which Ni catalyzed and improved electron transport from SA/CMC-ZFN to Cr(VI), thus leading to surge in Cr(VI) 31 , 32 . Furthermore, the pHzpc of SA/CMC-ZFN is 8.75 (Fig.S2(c)).…”

One-pot synthesis of spherical nanoscale zero-valent iron/biochar composites for efficient removal of Pb(ii)

“…Again, the experiments were performed in triplicate. The equilibrium adsorption capacity (q e ) of Pb(II) was calculated using eqn (2).…”

A review: a comparison of different adsorbents for removal of Cr (VI), Cd (II) and Ni (II)

“…In addition, the reason for lower adsorption may be found in the formation of a film around the adsorbent, which prevents the adsorbate from accessing the surface. At the same time, the adsorbent capacity may be higher, because the higher initial concentration provides the necessary driving force to overcome liquid resistance [8,16].…”

“…Depending on the adsorbent, a higher adsorbent dose will increase adsorption because of the higher number of active sites. If the adsorption is slower, the main cause is the aggregation of adsorbent particles, which resultes in fewer active sites [8].…”