|Effects of Al3+ doping on the structure and properties of goethite and its adsorption behavior towards phosphate|
|Li, W; Wang, LJ; Liu, F; Liang, XL; Feng, XH; Tan, WF; Zheng, LR; Yin, H; Zheng LR(郑黎荣)
|发表期刊||JOURNAL OF ENVIRONMENTAL SCIENCES
|摘要||Al substitution in goethite is common in soils, and has strong influence on the structure and physicochemical properties of goethite. In this research, a series of Al-doped goethites were synthesized, and characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and extended X-ray absorption fine structure (EXAFS) spectroscopy. The adsorption behavior of these samples towards PO43- was also investigated. Characterization results demonstrated that increasing Al content in goethite led to a reduction in crystallinity, increase in specific surface area (SSA), and morphology change from needle-like to granular. Rietveld structure refinement revealed that the lattice parameter a remained almost constant and b slightly decreased, but c was significantly reduced, and the calculated crystal density increased. EXAFS analysis demonstrated that the Fe(Al)-O distance in the structure of the doped goethites was almost the same, but the Fe-Fe(Al) distance decreased with increasing Al content. Surface analysis showed that, with increasing Al content, the content of OH groups on the mineral surface increased. The adsorption of phosphate per unit mass of Al-doped goethite increased, while adsorption per unit area decreased owing to the decrease of the relative proportion of (110) facets in the total surface area of the minerals. The results of this research facilitate better understanding of the effect of Al substitution on the structure and properties of goethite and the cycling of phosphate in the environment. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.|
; SUBSTITUTED GOETHITES
; ALUMINUM SUBSTITUTION
; REDUCTIVE DISSOLUTION
; VARYING CRYSTALLINITY
; HEXAGONAL BIRNESSITE
; BACTERIAL REDUCTION
Li, W,Wang, LJ,Liu, F,et al. Effects of Al3+ doping on the structure and properties of goethite and its adsorption behavior towards phosphate[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2016,45:18-27.
Li, W.,Wang, LJ.,Liu, F.,Liang, XL.,Feng, XH.,...&郑黎荣.(2016).Effects of Al3+ doping on the structure and properties of goethite and its adsorption behavior towards phosphate.JOURNAL OF ENVIRONMENTAL SCIENCES,45,18-27.
Li, W,et al."Effects of Al3+ doping on the structure and properties of goethite and its adsorption behavior towards phosphate".JOURNAL OF ENVIRONMENTAL SCIENCES 45(2016):18-27.