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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.