Comparison between Aluminum Hydroxide Coprecipitation and Adsorption for Removal of Dilute As(V) from Wastewater

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  • 水酸化物アルミニウムによる希薄Ａｓ（Ｖ）含有廃水処理における共沈法と吸着法の比較
  • スイサンカブツ アルミニウム ニ ヨル キハク As V ガンユウ ハイスイ ショリ ニ オケル キョウチンホウ ト キュウチャクホウ ノ ヒカク

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Abstract

The mechanism for removal of dilute As (V) by coprecipitation with aluminum hydroxide was investigated using sorption isotherms, X-ray diffraction (XRD) patterns, and zeta potential analysis. The results from the coprecipitation experiments were compared with those from simple adsorption experiments. <BR>During simple adsorption of As (V) on aluminum hydroxide, the sorption density obeyed a Langmuir-type isotherm. XRD patterns of the adsorbed As (V) were independent of the mass adsorbed. The relationship between zeta potential and sorption density was linear. These results suggest that As (V) was removed mainly by surface complexation.<BR>In comparison, during As (V) co-precipitation with aluminum hydroxide, the sorption density followed a BET-type isotherm at pH 5 and 7, and there was a steep increase in sorption density at a transition point. XRD patterns and zeta potential analysis also supported the existence of a transition point during As (V) co-precipitation. The transition was from surface complexation to precipitation, and occurred when the initial molar ratio was As/Al=1.5. These results suggest that during coprecipitation As (V) is removed by surface complexation at molar ratios of As/Al ≤ 1.5, and by the formation of amorphous aluminum arsenate at As/Al ≥ 1.5.

Journal

  • Journal of MMIJ

    Journal of MMIJ 127 (2), 82-87, 2011

    The Mining and Materials Processing Institute of Japan

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