Abstract: The present invention provides a method for advantageously producing an iron oxyhydroxide exhibiting excellent capability of adsorbing harmful substances, such as a phosphrous components and endocrine disrupting chemicals, which are contained in industrial wastewater, exhaust gases, etc., and an adsorbent material comprising the iron oxyhydroxide produced by the method as a main component. Specifically, the present invention provides an adsorbent material produced by a method comprising the steps of: (a) adding a base to an aqueous iron ion-containing solution, adjusting the pH of the resultant mixture to 9 or less, to form a precipitate that contains an iron oxyhydroxide; (b) drying the precipitate at a temperature of 100° C. or lower to obtain an iron oxyhydroxide; (c) contacting the resultant iron oxyhydroxide with water; and (d) subjecting the resultant iron oxyhydroxide to a heat treatment under a gas atmosphere having an inert gas concentration of 80% or greater at a temperature of 100 to 280° C.

Abstract: A classifying apparatus (1) has a flow path (structure) through which an emulsion flows. The flow path is provided between at least two plates (upper plate (2), lower plate (4)) that are separated by a distance smaller than the largest diameter of a liquid droplet included in the emulsion. Emulsion is fed from a supply port (5) provided in the upper plate (2) and can be classified by passing it in the flow path.