This study proposes the use of a cobalt-based Prussian blue analogue (Co-PBA; potassium cobalt hexacyanoferrate), as an adsorbent for the cost-effective recovery of aqueous ammonium ions. The characterization of Co-PBA involved various techniques, including Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, nitrogen adsorption-desorption analysis, and zeta potential. The prepared Co-PBA reached an adsorption equilibrium for ammonium ions within approximately 480 min, which involved both surface adsorption and subsequent diffusion into the interior. The isotherm experiment revealed a maximum adsorption capacity of 37.29 mg/g, with the Langmuir model indicating a predominance of chemical monolayer adsorption. Furthermore, the material consistently demonstrated adsorption efficiency across a range of pH conditions. Notably, adsorption was observed even when competing cations were present. Co-PBA emerges as a readily synthesized adsorbent, underscoring its efficacy in ammonium removal and selectivity toward ammonium.

1. 서 론
2. 실험 재료 및 방법
    2.1 실험 재료
    2.2 Co-PBA 합성
    2.3 Co-PBA 특성 분석
    2.4 Co-PBA의 암모늄 흡착 평가
3. 결과 및 고찰
    3.1 Co-PBA 특성 분석
    3.2 Co-PBA의 암모늄 흡착 성능 평가
4. 결 론
사 사
References

• 김태환(서울과학기술대학교 환경공학과) | Tae Hwan Kim (Department of Environmental Engineering, Seoul National University of Science and Technology)
• 날게스 데흐바시 니아(서울과학기술대학교 환경공학과) | Narges Dehbashi Nia (Department of Environmental Engineering, Seoul National University of Science and Technology)
• 윤여명(충북대학교 환경공학과) | Yeo-Myeong Yun (Department of Environmental Engineering, Chungbuk National University)
• 김태현(서울과학기술대학교 환경공학과, 한국원자력연구원 첨단방사선연구소) | Tae-Hyun Kim (Department of Environmental Engineering, Seoul National University of Science and Technology, Accelerator and Radioisotopes Research Section, Korea Atomic Energy Research Institute) Corresponding author
• 황유훈(서울과학기술대학교 환경공학과) | Yuhoon Hwang (Department of Environmental Engineering, Seoul National University of Science and Technology) Corresponding author