Fabrication of Fe/Mn oxide composite adsorbents for adsorptive removal of zinc and phosphate

Pretreatment by recyclable Fe3O4@Mg/Al-CO3-LDH magnetic nano-adsorbent to dephosphorize for the determination of trace F− and Cl− in phosphorus-rich solutions

“…LDHs promising ion-exchangers 17 for applications to adsorb the PO 4 3À anion. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] To efficiently adsorb PO 4…”

“…, the interlayer anion choice will play a key role. Based on LDHs, there are some good options to use the Cl À anion, 17,20,[22][23][24]31 or NO 3 À anion, 19,21,32 or Cl À and SO 4 2À anions 25 as the interlayer anion. They can be used to adsorb PO 4 3À effectively, but their adsorption efficiencies are inevitably affected by carbon dioxide (CO 2 ) or carbonate (CO 3 2À )…”

“…8 and 9 in Section 3.2, respectively). According to the literature, phosphate adsorption by some non-LDH adsorbents [66][67][68][69][70] and some LDH adsorbents [23][24][25][26]31,33 is greatly affected by F À or Cl À due to their adsorption. For LDHs, considering the bonding strength between the layers and interlayer anions in aqueous solution, 17 the strength of phosphates is generally higher than that of F À and Cl À .…”

“…Since there is a large amount of phosphate in aqueous solution, the adsorption possibility of phosphate is higher than that of F À or Cl À . However, it is still inevitable that a small amount of F À and Cl À will be adsorbed, [23][24][25][26]31,33 although this possibility is small. Thus, to further decrease this possibility, for the synthesized nano-adsorbent of Fe 3 O 4 @Mg/Al-CO 3 -LDH, CO 3 2À was employed as the interlayer anion.…”

Enhanced removal of antimony in dyeing wastewater by mixing Fe3O4 with manganese sand filter material

“…Manganese dioxide has rich and varied crystal morphology, a strong oxidation ability, and specific adsorption for heavy metals (Chon, Cho, Nam, Kim, & Song, 2018; Islam, Morton, Johnson, Mainali, & Angove, 2018). Iron oxide composite adsorption materials are also widely used to treat wastewater with heavy metals and organic pollutants for their advantages of low‐cost, high adsorption capacity and uniform particle dispersion (Nizamuddin et al, 2019; Yang et al, 2017).…”