Chitosan, natural organic polymer, has been applied in water treatment as adsorbent due to non-toxic for human being. The amino group as functional group, can interacts with cation and anion at the same time. The prepared chitosan bead (HCB) was crosslinked to increase chemical stability (HCB-G) and both HCB and HCB-G were prepared to increase physical strength by drying referred to DCB and DCB-G, respectively. The adsorption effect for crosslinking and drying for four types of chitosan bead was tested using pseudo fist order (PFO), pseudo second order (PSO), and intraparticle diffusion model (ID). Regardless of PFO and PSO, the order of K, rate constant, is as followed: HCB > HCB-G > DCB > DCB-G for Cu(II) and phosphate. Drying leading to contraction of bead significantly reduced adsorption rate due to reduce the porosity of chitosan. In addition, crosslingking also negatively effect on adsorption rate. When compared with Cu(II) using hydrogel bead, phosphate showed higher value than Cu(II) for PFO and PSO. The application of ID showed that both hydrogel beads (HCB and HCB-G) obtained a very low R2 ranging to 0.37 to 0.81, while R2 can be obtained to over 0.9 for DCB and DCB-G, indicting ID is appropriate for low adsorption rate.

ABSTRACT
1. 서 론
2. 실험 재료 및 방법
    2.1 CB 합성
    2.2 Kinetic 실험
    2.3 유사 1차/2차 반응속도 모델
    2.4 실험 분석
3. 결과 및 고찰
    3.1 PFO와 PSO
    3.2 건조의 영향
    3.3 PFO와 PSO의 선형화
    3.4 내부확산
4. 결 론
References

• 신정우(상명대학교 건설시스템공학과) | Jeongwoo Shin (Department of Civil Engineering, Sangmyung University)
• 김태훈(상명대학교 건설시스템공학과) | Taehoon Kim (Department of Civil Engineering, Sangmyung University)
• 이영민(상명대학교 건설시스템공학과) | Youngmin Lee (Department of Civil Engineering, Sangmyung University)
• 안병렬(상명대학교 건설시스템공학과) | Byungryul An (Department of Civil Engineering, Sangmyung University) Corresponding author