Sorption and filtration of metals using iron-oxide-coated sand

Synthesised magnetic nanoparticles coated zeolite (MNCZ) for the removal of arsenic (As) from aqueous solution

“…Unlike the procedure of Benjamin et al [23] and Beker et al [24] that used host materials (sand) or a non-ionized polymeric adsorbent (amberlite) respectively, as an adsorbent to loaded iron oxide, we combined iron oxide with material with a functional group (Al-OH) to excise the binding locations for Fe(II) and Fe(III). Therefore, Fe(II) and Fe(III) were loaded on zeolite mineral following the description of Jeon et al [22] with some modification.…”

“…The iron content of MNCZ spheres was 66 mg Fe g À1 . Compared to other host materials such as sand granules (2-10 mg Fe g À1 of sand) [23], calcium alginate beads (3.9 mg Fe g À1 of wet alginate bead) [25] and a magnetically active hybrid sorbent (MAHS) material (35.8 mg g À1 of dry beads) [24], the iron content deposited into MNCZ is higher.…”

The influence of ph and adsorbent concentration on adsorption of lead and zinc on a natural goethite

“…Goethite (α-FeOOH) is the most abundant and most stable of all forms of iron-oxides in soil and its surface chemistry affects the distribution of soluble species in soil (6). Synthetic goethite have been extensively study and applied for the removal of heavy metal contaminants from industrial solutions (7), radionuclides from nuclear reactor plants (8,9) and for municipal water treatment (10). Despite successes recorded at batch equilibration level, recent researches have shown that synthetic goethite, which commonly N. ABDUS-SALAM occurs as fine powders or as hydroxides gel, is not desirable as column packing material (11).…”

Magnetically recoverable iron oxide–hydroxyapatite nanocomposites for lead removal

“…The concept of magnetically induced coagulation of sewage as a remediation technique was introduced in the early 1990s using magnetite nanoparticles (Booker et al 1991), and several composite approaches involving sand, activated carbons, clays, zeolites and silica have been described since then (Benjamin et al 1996;Oliveira et al 2002;Oliveira et al 2003;Oliveira et al 2004). In this context, magnetic apatites obtained by association of iron oxide phases with hydroxyapatite have recently attracted attention, because they could offer the possibility for an easy and efficient recovery of the sorbent phase after treatment of contaminated waters (Dong et al 2010).…”