Using magnetite/zirconium-comodified attapulgite as a novel phosphorus (P) sorbent for the efficient removal of P and the adsorption mechanism allowing this effect

Abstract

Magnetite/zirconium-comodified attapulgite (Fe/ZrATP) acting as a novel phosphorus (P) sorbent was synthesized, characterized and applied to control P in an aquatic environment. Batch experiments demonstrated that at an adsorption dose of 0.2 g, 97.8% of the phosphate was rapidly sequestered from aqueous solution within 24 h, and the composite reached a maximal sorption capacity of 3 mg/g. The adsorption performance of the adsorbent Fe/ZrATP was minimally affected by changes in the initial pH (pH = 2–11). In addition, Fe/ZrATP presented excellent selectivity for phosphate when coexisting ions that often occur in water bodies were present; the solution ionic strength exerted little influence on phosphate sorption behavior. Adsorption and desorption experiments indicated that the removal of phosphate was mainly due to adsorption. The Fe/ZrATP adsorption isotherm was fitted to the Freundlich adsorption model. Moreover, the composite demonstrated excellent recyclability performance. The P adsorption mechanism of Fe/ZrATP involves electrostatic interactions, ligand exchange and surface precipitation. Our findings indicated that the separable Fe/ZrATP demonstrated high efficiency and sustainable phosphate removal, which is promising in phosphate removal and recovery applications

Physicochemical Properties of Marl and Travertine and their Thermally Modified Forms in the Perspective of Phosphorus Removal from Wastewater

“…Other physicochemical properties should indicate the characteristics of the material in terms of its use as a filtering medium/aiding purification, which, apart from not interfering with the operation of the purification device, should not adversely affect the chemical parameters and physicochemical properties of the purified medium [Jucherski et al, 2017;Bus et al, 2022]. For newly identified phosphorus sorbents beyond the materials included in the review [Gubernat et al, 2020], consideration should be given to: biochars [Almanassra et al, 2021;Luo et al, 2022], silica nanoparticles prepared from rice husk ash [Nguyen 2022], cockle shell powder [Nayeem et al, 2023], eggshells and calcined eggshells [Park et al, 2022] agnetite/zirconium-comodified attapulgite (Fe/ZrATP) [Deng et al, 2023]. The basic properties of sorbents/filter materials include structural properties, i.e.…”