無機層状イオン交換体ハイドロタルサイト化合物を用いたヒ素・セレン除去

概要

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It is well known that a hydrotalcite-like compound is a layer structure inorganic ion exchanger and has a high selectivity for certain anions. The authors clarified that the synthetic Mg-A-Cl form hydrotalcite (HT) has a high selectivity and a large adsorbing capacity for phosphate ions. It is estimated that HT has a high selectivity for anions, such as arsenate, arsenite, selenate and selenite ions, that have the same size and properties as phosphate ions. Therefore, we examined the adsorption capacities of HT to AsO43-, AsO33-, SeO42- and SeO32- in order to remove these anions using HT from the waste water. The obtained results were as follows. HT rapidly adsorbed AsO43-, AsO33-, SeO42- and SeO32- at the anion concentrations of 0.2 to 100 mg·l-1. The selectivity of AsO43-, AsO33-, SeO42- and SeO32- on the HT is very high. The removal mechanism of HT for AsO43-, AsO33-, SeO42- and SeO32- was ion exchange for Cl-. Furthermore, HT had a high ion exchange capacity for AsO43-, AsO33-, SeO42- and SeO32- under the condition of coexistence with other anions. Moreover, the concentrations of AsO43-, AsO33-, SeO42- and SeO32- in all treated water samples were below 0.1 mg·l-1, which is the waste water quality standard of As and Se. These results showed that HT is an effective adsorbent for the removal of AsO43-, AsO33-, SeO42- and SeO32- in the waste water.
社団法人　日本水環境学会の論文
2005-04-10