알칼리 침전제에 의해 제조된 아연 중간생성물 및 산화아연 결정화
Synthesis of Zn-intermediate from alkali agents and its transformation to ZnO crystallinity
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ZnO는 출발물질인 황산아연과 알칼리 침전제인 NaOH와 Na2CO3에 의해 생성된 아연 중간생성물의 변이 거동과 결정화 조건에 따라 제조하였다. ZnO 결정화를 위해 아연 중간생성물인 Zn4(OH)6SO4·H2O, Zn5(OH)6(CO3)2·H2O를 각각 400°C, 800°C에서 1시간 하소하였고, 하소 온도는 열중량 분석을 기반으로 하였다. 아연 중간생성물인 Zn4(OH)6SO4·H2O은 400°C에서 Zn4(OH)6SO4·H2O, ZnO 결정상이 혼재됨을 확인하였고, 800°C에서 완전히 열분해되어 순수한 ZnO만 형성되었다. Na2CO3와 반응하여 생성된 아연 중간생성물인 Zn5(OH)6(CO3)2·H2O는 400°C 이상에서 완전한 ZnO의 결정상을 확인하였다. Na2CO3와 반응을 통해 상대적으로 낮은 하소 온도에서 나노 입자의 ZnO를 합성할 수 있었다.
Abstract
ZnO was synthesized according to the transformation behavior and crystallization conditions of Zn-intermediate obtained by zinc sulfate as a precursor and NaOH, Na2CO3 as a alkali agents. For ZnO crystallization, Zn4(OH)6SO4·H2O andZn5(OH)6(CO3)2·H2O as a Zn-intermediate were calcined at 400°C and 800°C for 1 h, respectively, based on decomposition temperature from TGA. Zn4(OH)6SO4·H2O was confirmed to have mixed Zn4(OH)6SO4·H2O and ZnO at 400°C, and was completely thermally decomposed at 800°C to form ZnO phase. The prepared Zn5(OH)6(CO3)2·H2O as a Zn-intermediate by the reaction with Na2CO3 was transformed to a complete ZnO crystallization over 400°C. Nano-sized ZnO can be synthesized at a relatively lower calcination temperature through the reaction with Na2CO3.
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