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Chromate anion was effectively concentrated on an anion exchanger, layered double hydroxide (LDH), from aqueous solution. The LDHs used in this study were synthesized by hydrothermal reactions using urea hydrolysis as reported previously (Ogawa and Kaiho, 2002). The ion exchange was conducted at pH=3 to concentrate larger amount of dichromate (Cr 2 O 72− ). The adsorption isotherms...
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