Phosphate adsorption from solution by metal oxide nanoparticles and the potential on phosphate capture

Document Type

Article

Publication Date

7-20-2017

Abstract

Effects of four different metal oxide nanoparticles (nMgO, nAl2O3, nTiO2 and nFe2O3) on phosphate adsorption were compared in the batch experiment. The influences of solution pH, contact time and coexist ions on phosphate adsorbed by nMgO were examined. Further, the phosphate adsorption mechanism onto nMgO was evaluated by XRD and XPS analysis. And the potential of recovered phosphate by nMgO from pig breeding wastewater on fertilzer was assessed by pot experiment. The results showed that nMgO had higher phosphate adsorption ability than nAl2O3, nTiO2 and nFe2O3. The phosphate amount reached 40, 31.77, 15.93 and 13.08mg/g in the range of pH 3.0 to 8.0 for nMgO, nAl2O3, nTiO2 and nFe2O3, respectively. The phosphate adsorption was a inreversible process. The phosphate sorption onto nMgO could reach equilibrium within 0.5h, the adsorption process fitted the pseudo-second order kinetic model. The equal content of coexisted F-, Cl-, NO3-, SO42-, Na+, K+ and NH4+ ions had no negative influence on phosphate adsorbed onto nMgO, while the existence of Mg2+ and Ca2+ ions could promote the phosphate adsorption. Langmuir model could be used to describe the adsorption isotherm, by which the maximum phosphate adsorption capacity was around 139.3mg/g. Based on the results of XRD and XPS analysis, it can be concluded that phosphate adsorption was dominated by chemical precipitation reaction combined with electrostatic attraction process. nMgO particles effectively recovered phosphate from piggery wastewater, in turn the phosphate loaded nMgO nanoparticle could be used as a potential substitute for phosphate-based fertilizer, which significantly improved the cabbage dry biomass from 0.31 to 0.96g/kg soil.

Publication Source (Journal or Book title)

Zhongguo Huanjing Kexue/China Environmental Science

First Page

2557

Last Page

2565

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