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활성탄에 의한 구리 (Ⅱ) 암모니아 착염이온의 흡착 특성
홍완해,김정규,나상권 ( Wan Hae Hong,Jung Gyu Kim,Sang Kwon Na ) 한국공업화학회 1997 공업화학 Vol.8 No.1
활성탄에 의한 암모니아 구리착물의 흡착 특성에 대하여 연구하였다. 활성탄 비표면적을 BET 흡착장치에서 측정하였고, 암모니아수용액에서 암모니아 착물를 이용하여 Cu(II)이온 제거 특성과 활성탄에 의한 착물흡착에서 암모니아착물 형태에 대하여 연구하였다. 실험 결과 비표면적 크기는 mesh No.가 감소할 수록 증가하였고, 활성탄에 의한 Cu(II)이온 흡착은 pH 6 범위가 적합함을 알았다. 또한 암모니아수용액에서 암모니아 구리착물이 활성탄에 흡착되는 형태는 [Cu(NH₃)_2]^(2+)와 [Cu(NH₃)₃]^(2+)로 흡착됨을 알았으며, 암모니아 농도는 2.25×10^(-4)∼2.25×10^(-3)(mol/ℓ) 범위에서 검토하였다. The adsorption characteristics of ammonia-Cu(II) complex on activated carbon were studied. Firstly, the specific surface area of the activated carbon was measured by using the BET adsorption apparatus. Secondly, the characteristics of the removal copper(II) ion from aqueous ammonia solution by forming a complex with ammonia and then by the adsorption of the complex on the activated carbon were studied. It was found that the specific surface area increases with decreasing the mesh number of the activated carbon, and the optimum pH for the adsorption of the Cu(II) ion on the activated carbon was found to be approximately 6. It was also found that the adsorbed Cu(II)-ammonia complexes on the activated carbon in the aqueous ammonia solution have two types, depending on the concentration of the solution ; i.e. [Cu(NH₃)₂]^(2+) and [Cu(NH₃)₃]^(2+) for 2.25×10^(-4)(mol/ℓ) and 2.25×10^(-3)(mol/ℓ), respectively.
Poly (trimethylene terephthalate) 의 등온결정화 속도에 관한 연구
홍완해,김정규,나상권 한국공업화학회 2000 응용화학 Vol.4 No.2
Isothermal crystallization kinetics of Poly(trimethylene terephthalate), PTT has been investigated using photomicrograph. The crystallization process of PTT was crystal growth and its morphology the Maltese cross.
비누화반응에 의한 폐 Poly(butylene terephthalate)의 해중합
유지환,나상권,홍완해,김정규 한국고무학회 2002 엘라스토머 및 콤포지트 Vol.37 No.2
온화한 조건(80∼110℃, 대기압)하에서 비누화반응에 의해 폐 PBT의 입자를 해중합하였다. PBT의 해중합은 KOH 보다 NaOH가 보다 효과적이었으며, 반응온도가 증가하고 입자의 크기가 작을수록 해중합은 증가하였다. 해중합속도는 표면반응이 율속단계로서 PBT 입자표면에 생성물이 형성되지 않은 미반응핵 모델에 의해 표현할수 있었다. 겉보기활성화에너지는 98.1KJ/mol 이었으며, 85.1, 105㎛인 PBT 입자를 6시간 동안 해중합하였을때 TPA의 회수율은 약 95%정도였다. Waste PBT powder was depolymerized by saponification under the mild temperature conditions(80 ~ 110℃) and atmospheric pressure. In depolymerization of PBT, sodium hydroxide was more effective than potassium hydroxide. The depolymerization increased with increasing reaction temperature and decreasing particle size. The reaction kinetics of depolymerization could be expressed by the shrinking unreacted core model without product layer, in which the surface reaction was a rate determining step. The activation energy was 98.1 KJ/mol. The recovery ratio of the TPA obtained from the depolymerized PBT particles of 85.1 and 105 ㎛for 6 hours was about 95%.