Adsorption of phosphate in water using one-step synthesized zirconium-loaded reduced graphene oxide

Abstract

In this account, a one-step green hydrothermal method for zirconium-loaded reduced graphene oxide (RGO-Zr) adsorbent was developed in pure water. It is based on the formation of initially strong-coupling RGO-Zr nanocomposites followed by in situ reduction of GO to RGO during the hydrothermal treatment. The phosphate adsorption performance of the as-prepared nanocomposites was investigated in aqueous environment under various conditions. The characterization results of RGO-Zr nanocomposites showed that ZrO2 was successfully integrated onto the RGO sheets in amorphous. The data from equilibrium phosphate adsorption on RGO-Zr revealed that the adsorption kinetics followed a pseudo-second-order kinetic model, where the adsorption isotherm fitted the Langmuir isotherm model with a maximum adsorption capacity of 27.71 mg P/g at pH 5 and 298 K. The improved phosphate adsorption on RGO-Zr was caused by the dispersion of ZrO2 on the RGO surface. Furthermore, the phosphate adsorption was found insensitive to the increase in pH while it was sensitive to the increase in temperature. The coexisting anions of SO42−, F−, Cl−, NO3− and CO32− affected the phosphate adsorption in a different way. Results suggest that the present RGO-Zr adsorbent has the potential for controlling phosphorus pollution in water.

Enhanced Removal of Phosphates by the Adsorbent Consisting of Iron Oxide Loaded on Porous Chitosan/Cellulose Acetate Particle

“…Therefore, the adsorption of phosphates by iron oxide loaded chitosan-cellulose acetate particles followed the pseudo second order kinetic model, and it suggests that chemisorption, involving valence shared or electron exchange between adsorbate and adsorbent is what the adsorption is based on [24]. Similar observations have also been report in other studies [15] [25] [26]. In general, the regression for all three models was found to be R 2 > 0.9 and hence the results suggest both physical and chemical adsorption might be involved in the adsorption process.…”

Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

“…The adsorption kinetics for all three contaminants were better described by the pseudo-second-order model, i.e., the rate of adsorption was proportional to the square of the number of unoccupied sites on the surface of Al-Mg/GO composites and to the concentration of contaminants in the solution. Similar kinetic results have been reported for adsorbing these contaminants on the surface of different adsorbents [21,30,58]. The pH evolution during the adsorption process exhibited the same trend (approaching the pH pzc ) for all three contaminants (Fig.…”

“…Therefore, a simple, green, and scalable method is needed to synthesize separation-free GO-based composites for runoff quality control. A recent study reported a one-step synthesis of Zr-loaded rGO for phosphate adsorption, indicating the feasibility of developing multifunctional GO-based adsorptive materials via facile procedures for stormwater management [30].…”

Cathodic activation of synthesized highly defective monoclinic hydroxyl‐functionalizedZrO2nanoparticles for efficient electrochemical production of hydrogen in alkaline media

“…Also, the component couldpartially be related to water chemisorption and formation of surface hydroxide species Zr(OH) 4 . 62 The analyzed C 1s peak can be curve-fitted with three components at 284.6, 286.5 and 288.6 eV ascribed to adventitious carbon and tartrate species. 61,63 The analysis was summarized in Table 1.…”