Abstract: A method of preparing an amorphous iron sulfide carrier for removing nitrogen from water, which effectively removes nitrogen from wastewater containing nitrate nitrogen or nitrite nitrogen, includes the stabilizing step for an hydrogen sulfide saturated-iron hydroxide material by immersing the material in water for a certain period of time, a step (S10) of preparing iron hydroxide for hydrogen sulfide adsorption having pores and a surface capable of adsorbing hydrogen sulfide; a step (S20) of introducing hydrogen sulfide into the prepared iron hydroxide to reach the iron hydroxide and produce amorphous iron sulfide; and a step (S30) of stabilizing the amorphous iron sulfide produced by reacting with hydrogen sulfide, by immersing in water for one or more days.

Abstract: Provided are gas injection apparatuses, thin-film deposition equipment, and methods for manufacturing a semiconductor device.