ANION ADSORBENT, PROCESS FOR PRODUCING THE SAME AND METHOD OF WATER TREATMENT

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An anion adsorbent comprising a fired clay of porous structure and, supported thereby, a rare earth compound. This anion adsorbent is produced by a process comprising the mixing step of mixing a clay with an auxiliary agent for realization of porous structure, the firing step of firing the mixture obtained by the mixing step and the supporting step of causing the clay prior to the mixing step and/or the firing product after the firing step to support a rare earth compound. There is further provided a method of water treatment, comprising bringing this anion adsorbent into contact with water to be treated at given pH value to thereby adsorb and remove anions contained in the water and bringing the adsorbent after adsorption of anions into contact a solution of pH value different from the given pH value to thereby effect desorption of anions from the adsorbent.