Fe(III)吸着剤による人工廃水からのヒ素(III)の除去および溶出

概要

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In this study an arsenic plate adsorbent was prepared in two stages. Initially a Fe(III) bearing high molecular solid particle adsorbent was made from a ferric salt. Finally the solid particle was evenly spread on a plastic plate by using a special treating process to become an arsenic plate adsorbent. The mechanism of arsenic adsorption on this adsorbent is a kind of ion exchange process. It can adsorb both arsenic(III) and arsenic(V) from the wasted water. The arsenic removal was about 99%. In a solution contains 20mg/L arsenic at pH6. 99% of arsenic was removed in 2 hours by a l0g/L solid particle adsorbent and the final arsenic concentration was reduced to below 0.05mg/L arsenic. Furthermore, it was found that the re-adjustment of solution pH and temperature might cause the elution of arsenic and let it return back to the solution. The activity of the adsorbent was not reduced after elution. Thus, it can be re-used several times without producing the contaminated mud. The cost of the contaminated mud treatment can be reduced or completely avoided. The recovery and recycling of arsenic metal for re-use are feasible. Under the condition of high alkali solution (pH13), 363K and 2 hours, a plate adsorbent was re-used for five cycles with the arsenic elution was 80-99%.
社団法人資源・素材学会の論文
2005-06-25