Effect of alkali metal hydroxide on formation processes of zinc oxide crystallites from aqueous solutions containing Zn(OH)42− ions
Effect of alkali metal hydroxide on formation processes of zinc oxide crystallites from aqueous solutions containing Zn(OH)42− ions
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DOI：
10.1039/b310306d
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发表时间：
2004-01
影响因子：
3.3
通讯作者：
N. Uekawa;R. Yamashita;Y. Wu;K. Kakegawa
中科院分区：
文献类型：
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作者：
N. Uekawa;R. Yamashita;Y. Wu;K. Kakegawa
通过将50 ml 1.5 mol l−1碱金属氢氧化物（MOH：M = Li、Na、K、Cs）水溶液加入50 ml 0.1 mol l−1水合硝酸锌（Zn（NO3）2·6 H2O）水溶液中制备含有Zn（OH）42−离子的水溶液。通过在≥348或368 K下加热含有Zn（OH）42−离子的水溶液3 h获得氧化锌（ZnO）微晶。形貌取决于Zn（OH）42−水溶液的加热温度和用于获得Zn（OH）42−离子的碱金属氢氧化物。根据氧化锌生成动力学的结果，表明当使用NaOH、KOH和CsOH来获得Zn（OH）42 −离子时，Zn（OH）42 −离子在氧化锌表面上的分解是速率控制步骤。当使用LiOH来获得Zn（OH）42−离子时，速率决定步骤是氧化锌的成核和/或Zn（OH）42−离子的吸附。
Aqueous solutions containing Zn(OH)42− ions were prepared by adding 50 ml of 1.5 mol l−1 aqueous alkali metal hydroxide (MOH: M = Li, Na, K, Cs) to 50 ml of 0.1 mol l−1 aqueous zinc nitrate hydrate (Zn(NO3)2·6H2O). Zinc oxide (ZnO) crystallites were obtained by heating aqueous solutions containing Zn(OH)42− ions at ≥348 or 368 K for 3 h. The morphology depended on both of the heating temperature of the Zn(OH)42− aqueous solution and the alkali metal hydroxide used to obtain Zn(OH)42− ions. According to the result of the kinetics of the zinc oxide formation, it was shown that the decomposition of Zn(OH)42− ions on the zinc oxide surface was the rate determining step when NaOH, KOH and CsOH were used to obtain Zn(OH)42− ions. When LiOH was used to obtain Zn(OH)42− ions, the rate determining step was the nucleation of zinc oxide and/or the adsorption of Zn(OH)42− ions.