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Synergistic effect of mesoporous feroxyhyte nanoparticles and Fe(II) on phosphate immobilization: Adsorption and chemical precipitation

Li, Yongye, Fu, Fenglian, Cai, Weitian, Tang, Bing
Powder technology 2019 v.345 pp. 786-795
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, adsorption, chemical precipitation, endothermy, iron, models, nanoparticles, pH, phosphates, pollution, porous media, powders, sorption isotherms, synergism, transmission electron microscopy, wastewater
The pollution of phosphate has been regarded as a serious global environmental issue in the past decade. In this study, mesoporous feroxyhyte (δ-FeOOH) nanoparticles were synthesized and δ-FeOOH/Fe(II) system was employed for the removal of phosphate. Effect of initial pH as well as conversion of Fe(II)/Fe(III) in solution were investigated. Brunauer-Emmett-Teller analysis, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were employed to characterize the δ-FeOOH nanoparticles before and after reaction in order to reveal the possible mechanism. Results indicated that δ-FeOOH/Fe(II) system showed a great removal performance (94.1%) for phosphate under acidic condition and the removal of phosphate by δ-FeOOH/Fe(II) system was a process which simultaneously included adsorption and chemical precipitation. Phosphate removal by δ-FeOOH/Fe(II) system was endothermic, spontaneous and followed the Freundlich isotherm model and pseudo-second-order model. The great phosphate removal capability of the δ-FeOOH/Fe(II) system exhibited its potential as an effective method for phosphate immobilization in wastewater.