Synthesis of 2D Magnesium Oxide Nanosheets: A Potential Material for Phosphate Removal

Abstract

Phosphate ions are responsible for eutrophication in drinking and wastewater, so it is necessary to limit the phosphate concentration in water bodies to limit the eutrophication problem. Porous magnesium oxide (MgO) nanosheets are synthesized at room temperature by simple precipitation and calcination. The synthesized material is characterized by various techniques. The sheet‐like MgO and commercial MgO are evaluated by the batch adsorption test. The synthesized material has an efficient adsorption efficiency of 95% at pH 5 as compared with commercial MgO, having a removal efficiency of 24% under the same investigated conditions. The synthesized MgO can be an efficient adsorbent material to overcome the eutrophication problem of the waste/domestic water.

Synthesis and Characterization of 2D Magnesium Oxide Nanoflakes: A Potential Nanomaterial for Effective Phosphate Removal from Wastewater

“…Hence, the response follows the pseudosecond-order kinetic model. [8,16,59,66] The Kp2 value obtained is considerably small, which indicates the high adsorption rate of 2D MONFs. Table 3.…”

“…Reflection peaks appear at 2θ = 36.78°, 42.77°, 62.16°, 75.27°, and 78.41°. [59] The d spacing values of each peak are 0.244 nm, 0.211 nm, 0.149 nm, 0.126 nm, and 0.121 nm, respectively, which corresponds to Miller planes of (111), ( 200), ( 220), (311), and (222), respectively. [60,61] The Debye Scherrer equation ( 1) can be used to calculate average crystallite size (D),…”

“…They obtained a constant phosphate removal at pH = 4-6 and a gradual decrease at pH 7-8. [59] It intimates that the adsorption of phosphate onto MONFs depends on physical interactions between the surface adsorption sites of the adsorbent and adsorbate and the ionic state of the functional group present in the adsorbent and the pH of the solution. [78][79][80] Physical interaction depends on the charge of the anions present in the medium.…”

“…The value of n signifies the interactions between the adsorbent (2D MONFs) and the ion (PO 4 3À ). [59] Figure 4(a) shows the Langmuir isotherm plot, and Figure 4(b) shows the Freundlich adsorption isotherm plot. The parameters of each isotherm can be calculated using the slope and intercept, which are depicted in Table 1.…”

“…They have found a similar result: the crystal structure has been converted to Mg(OH) 2 . [59] When the MgOH + attracts phosphate ions, Mg 3 (PO 4 ) 2 and MgHPO 4 crystal structure compounds can be deposited on the surface of MONF. It is beneficial to maintain the forward reaction of generating MgOH + sites, which boosts the density of MgOH + followed by MgO hydroxylation.…”