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RISS 인기검색어
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α- Ferric oxyhydroxide 입자의 핵성장 반응에 관한 연구
신동옥,설수덕 ( Soo Duk Seul,Dong Ock Shin ) 한국공업화학회 1997 공업화학 Vol.8 No.4
공기를 산화제로 하여 황산제일철 용액에 침전제로서 KOH, NaOH, Na₂CO₃ 및 K₂CO₃를 사용하여 산화침전반응을 행하여 생성되는 α-ferric oxyhydroxide입자의 생성 및 성장과정을 자유 pH 변화실험을 통하여 관찰하였다. α-ferric oxyhydroxide입자의 생성 및 성장과정은 모든 침전제에서 동일한 형태를 나타내었으며 KOH, NaOH에의해 생성된 α-ferric oxyhydroxide 결정입자의 길이는 Na₂CO₃ 및 K₂CO₃에 의해 생성된 것보다 약 1.5배 정도 짧았다. KOH를 침전제로 황산제일철을 공기 산화한 결과 초기침전제의 몰비 (R。=[Fe^(2+)]。/[OH^-]。) 값이 작아질수록 결정 입자의 길이가 종축 방향으로 길게 성장하였으며 생성물은 1㎛ 이하의 균일한 침상형의 α-ferric oxyhydroxide였다. 또한 황산제일철에 KOH를 침전제로 공기를 산화제로 하여 고정 pH 실험법에 의하여, 공기 유속,초기 침전제의 몰비 (R。=[Fe^(2+)]。/[OH^-]。) 및 반응 온도의 변화에 따른 α-ferric oxyhydroxide의 핵성장 반응속도에 관하여 알아보았다. 공기 유속, 반응 온도 및 R。값이 증가할수록 α-ferric oxyhydroxide 입자의 핵성장 반응속도는 점차적으로 증가하였으며, 핵성장의 활성화 에너지는 16.16 KJ/mol 이며, 공기 유속, R。값 및 반응온도의 영향에 대한 핵성장 반응속도 관계식은 다음과 같다. -d[Fe^(2+)]/dt=1.46×10⁴[Po₂]^(0.66)[OH^-]^(2.19) exp(-16.16/RT) The seed formation and growth of α-ferric oxyhydroxide with aerial oxidative precipitation from aqueous solution of ferrous sulfate with KOH, NaOH, Na₂CO₃ and K₂CO₃ as precipitants have been studied by free pH drift experiment. It has been shown that all precipitants give same particle formation and growth path, and average particle length from KOH and NaOH as precipitants was about 1.5 times shorter than that of K₂CO₃ and Na₂CO₃. When initial mole ratio, R。=[Fe^(2+)]。/[OH^-]。, of KOH was decreased the particle was grown to longitudinal direction and needle-like α-ferric oxyhydroxide particle of submicron size was obtained. The kinetics of α-ferric oxyhydroxide seed growth from aqueous solution of ferrous sulfate with KOH has been studied. The influence of the air flow rate, reaction temperature and initial mole ratio, R。=[Fe^(2-)]。/[OH^-]。, on the kinetics of seed growth are investigated by static pH experiment. The oxidation rate of seed growth increased with increas in the air flow rate, reaction temperature and initial mole ratio. The activation energy of seed growth is 16.16 KJ/mol and the rate equation of seed growth can be written as follows: -d[Fe^(2+)/dt=1.46×10⁴[Po₂]^(0.66)[OH^-]^(2.19) exp(-16.16/RT)
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Oxyhydroxide 입자의 산화침전반응에 관한 연구
설수덕,신동옥 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The aeroal oxidative precipitation and kinetics of α-FeOOH formation from aqueous solution of ferrous sulfate with KOH as a precipitant have been studied. The influence of reaction temperature and initial mole ratio, R_o=[Fe^2+]_o/[OH]_o, value on the morphology and oxidation rate of α-oxyhydroxide particles and kinetics of seed formation are investigated by free pH drift and static pH experiment. The results show that the increase or air flow rate, reaction temperature and initial mole ratio increases the oxidation rate through the seed formation and seed growth of the pH drift experiment. Needle-like α-oxyhydroxide particle of submicron size was obtained and when R_o value was decreased the particle was grown to longitudianl direction. The oxidation reaction of seed formation is apparently first order.
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廢황산제일철로부터 Goethite의 산화침전반응에 관한 연구
설수덕,신동옥 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1
The influence of precipitants on the particle formation and growth of geothite by means of aerial oxidative precipitation from aqueous solution of ferrous sulfate with KOH, Ca(OH)₂, NaHCO₃, and H₂O₂ as a precipitants have been studided on the same oxidative precipitation condition. Submicron of needle-like geothite( a-FeOOH) particle was obtained from all kinds of alkaline precipitants KOH, Ca(OH)₂ and NaHCO₃. On the other hand, NaNO₃ and H₂O₂ were didn't not influence on the particle formation and growth. The kinetics of geothite particle formation and growth from aqueous solution of ferrous sulfate with KOH as a precipitant have been studied. The influence of air flow rate, reaction temperature and initial mole ratio, R_(o)=[Fe^(2+)]_(o)/[OH^(-)]_(o), on the kinetics of particle formation and growth are investigated by static pH experiment. The results show that the increase of air flow rate, reaction temperature and initial mole ratio increases the oxidation rate through the particle formation and growth. The activation energy of particle formation and growth is 11.71 KJ/mol and 16.16 KJ/mol and rate equation of particle formation and particle growth can be written as follows: <particle formation> - d[Fe^(2+)]/dt = 1.69×10 ₄ [P_(O₂)]^(0.56) [OH^(-)]^(1.71)exp(- 11.71/RT) <particle growth> - d[Fe^(2+)]/dt = 1.46×10 ₄ [P_(O₂)]^(0.66) [OH^(-)]^(2.19)exp(- 16.16/RT)
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Oxyhydroxide 입자의 산화침전반응에 관한 연구
설수덕,신동옥 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.3
황산제일철에 수산화칼륨을 침전제로 공기를 산화제로 하여 자유 pH 변화 및 고정 pH 실험법에 의하여, 공기 유속, 초기 침전제의 몰비(R_o=[Fe^(2+)]_o/[OH]_o) 및 반응온도의 변화에 따른 oxyhydroxide의 산화침전과정과 핵생성 산화반응속도에 관하여 알아보았다. 공기 유속, 반응온도 및 R_o값이 증가할수록 oxyhydroxide입자의 핵생성부터 핵성장까지의 산화 침전속도는 점차적으로 증가하였으며, 이때 생성물은 1㎛ 이하의 균일한 침상형의 α-oxyhydroxide였으며, R_o값이 작아 질수록 결정 입자의 길이가 종축 방향으로 성장하였다. 핵생성의 활성화 에너지는 11.71KJ/㏖이며 공기 유속, R_ο값 및 반응온도의 영향에 대한 핵생성 산화반응속도 상관관계식은 다음과 같다. (수식) The aerial oxidative precipitation and kinetics of oxyhydroxide formation from aqueous solution of ferrous sulfate with KOH as a precipitant have been studied. The influence of air flow rate, reaction temperature and initial mole ratio, R_o=[Fe^(2+)]_o/[OH]_o, on the morphology and oxidation rate of oxyhydroxide particles and kinetics of seed formation are investigated by free pH drift and static pH experiment. The results show that the increase of air flow rate, reaction temperature and initial mole ratio increases the oxidation rate through the seed formation and seed growth on the free pH drift experiment. Needle-like α-oxyhydroxide particle of submicron size was obtained. When R_o value was decreased the particle was grown to longitudinal direction. The activation energy of seed formation is 11.71 KJ/㏖ and rate equation of seed formation can be written as follows: (수식)
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