Simultaneous removal of arsenate and fluoride from water by Al-Fe (hydr)oxides

doi:10.1007/s11783-013-0533-0

Front. Environ. Sci. Eng.

2014, Vol. 8

Issue (2) : 169-179 https://doi.org/10.1007/s11783-013-0533-0

RESEARCH ARTICLE

Simultaneous removal of arsenate and fluoride from water by Al-Fe (hydr)oxides

Junlian QIAO¹, Zimin CUI², Yuankui SUN¹, Qinghai HU¹, Xiaohong GUAN¹(

)

¹. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
². State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China

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Abstract

Al-Fe (hydr)oxides with different Al/Fe molar ratios (4∶1, 1∶1, 1∶4, 0∶1) were prepared using a co-precipitation method and were then employed for simultaneous removal of arsenate and fluoride. The 4Al：Fe was superior to other adsorbents for removal of arsenate and fluoride in the pH range of 5.0–9.0. The adsorption capacity of the Al-Fe (hydr)oxides for arsenate and fluoride at pH 6.5±0.3 increased with increasing Al content in the adsorbents. The linear relationship between the amount of OH⁻ released from the adsorbent and the amount of arsenate or fluoride adsorbent by 4Al：Fe indicated that the adsorption of arsenate and fluoride by Al-Fe (hydr)oxides was realized primarily through quantitative ligand exchange. Moreover, there was a very good correlation between the surface hydroxyl group densities of Al-Fe (hydr)oxides and their adsorption capacities for arsenate or fluoride. The highest adsorption capacity for arsenate and fluoride by 4Al：Fe is mainly ascribed to its highest surface hydroxyl group density besides its largest pH_pzc. The dosage of adsorbent necessary to remove arsenate and fluoride to meet the drinking water standard was mainly determined by the presence of fluoride since fluoride was generally present in groundwater at much higher concentration than arsenate.

Keywords Al-Fe (hydr)oxides groundwater adsorption hydroxyl group ligand exchange

Corresponding Author(s): Xiaohong GUAN

Issue Date: 01 April 2014

Cite this article:

Junlian QIAO,Zimin CUI,Yuankui SUN, et al. Simultaneous removal of arsenate and fluoride from water by Al-Fe (hydr)oxides[J]. Front. Environ. Sci. Eng., 2014, 8(2): 169-179.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0533-0
https://academic.hep.com.cn/fese/EN/Y2014/V8/I2/169

Fig.1 XRD patterns of the Al-Fe binary (hydr)oxides and pure Fe (hydr)oxides (a) 4Al:Fe; (b) Al:Fe; (c) Al:4Fe; (d) Fe

Fig.2 SEM-EDAX analysis of the Al-Fe binary (hydr)oxides and pure Fe (hydr)oxides: (a) 4Al:Fe; (b) Al:Fe; (c) Al:4Fe; (d) Fe

Fig.3 Influence of pH on arsenate adsorption by the Al-Fe binary (hydr)oxides and pure Fe (hydr)oxides without (a) or with (b) the presence of fluoride (initial As(V) = 5?mg·L⁻¹, initial F⁻ = 20?mg·L⁻¹, adsorbent dose= 0.2?g·L⁻¹)

Fig.4 Influence of pH on fluoride adsorption by the Al-Fe binary (hydr)oxides and pure Fe (hydr)oxides without (a) or with (b) the presence of arsenate (Initial F⁻ = 20?mg·L⁻¹, initial As(V) = 5?mg·L⁻¹, adsorbent dose= 0.5?g·L⁻¹)

Fig.5 Influence of 4Al:Fe adsorbent dosage on simultaneous removal of arsenate and fluoride as a function of pH (a) Removal efficiency of As(V); (b) Removal efficiency of F⁻ (initial As(V) = 5?mg·L⁻¹, initial F⁻ = 20?mg·L⁻¹, adsorbent dose= 0.2 or 0.5?g·L⁻¹, ionic strength= 0.01?mol·L⁻¹)

Tab.1 Model isotherm constant of arsenate adsorption by Al-Fe binary (hydr)oxides

Fig.6 Adsorption isotherm of arsenate on Al-Fe binary (hydr)oxides or Fe (hydr)oxides (a) in the absence or (b) in the presence of fluoride. The dots are experimental data. The solid lines and the dotted lines are the results fitted by Langmuir isotherm and Freundlich isotherm, respectively. (initial As(V) = 0−15?mg·L⁻¹, initial F⁻ = 0 or 20?mg·L⁻¹, adsorbent dose= 0.2?g·L⁻¹, initial pH= 6.0, final pH= 6.5±0.3)

Fig.7 Adsorption isotherm of fluoride on Al-Fe binary (hydr)oxides or Fe (hydr)oxides (a) in the absence and (b) in the presence of arsenate. The dots are experimental data. The solid lines and the dotted lines are the results fitted by Langmuir isotherm and Freundlich isotherm, respectively. (initial F⁻ = 0−50?mg·L⁻¹, initial As(V) = 0 or 5?mg·L⁻¹, adsorbent dose= 0.5?g·L⁻¹, initial pH= 6.0, final pH= 6.5±0.3)

Tab.2 Model isotherm constant of fluoride adsorption by Al-Fe binary (hydr)oxides

Fig.8 (a) Correlation between the amount of surface hydroxyl groups released from 4Al:Fe and the amount of fluoride or arsenate removed by 4Al:Fe at pH 7.0; (b) correlation between the adsorption capacity of various Al-Fe binary (hydr)oxides and pure Fe (hydr)oxides for arsenate or fluoride with their surface hydroxyl group densities

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