Hydrothermal synthesis of micro/nano metallic copper using green tea water as both solvent and reductant

doi:10.16085/j.issn.1000-6613.2018-0690

Abstract

Abstract:

Micro/nano metallic Cu powders with different morphologies were prepared by hydrothermal method using green tea water as both solvent and reductant. The effects of pH, green tea concentration, hydrothermal temperature and TiOSO₄ additive on the phase purity and particle morphology of the micro/nano Cu were also investigated. The results show that pure Cu powders with nearly spherical shape could be obtained under the conditions of pH=3—12, the mass ratio of tea to water as 1∶100 and temperature of 200℃. When the ratio of tea to water or the reaction temperature was decreased, two phases of Cu and Cu₂O would form, and the relative content of Cu₂O in the product gradually increased. Additionally, using the pure Cu₂O powders which were obtained by performing the first hydrothermal process as the starting material, one-dimensional metallic Cu rods with a length of 10—40μm and a diameter of 0.4—0.9μm were obtained after a second hydrothermal processing at 200℃ for 24h with additive of 0.1g TiOSO₄.

Key words: micro scale, micro/nano metallic copper, green tea water, hydrothermal, crystal morphology, green synthesis, reduction

摘要：

以绿茶茶水兼为溶剂和还原剂，采用水热法直接还原制备出不同形貌的微纳米金属Cu粉，同时研究了pH、茶水浓度（茶粉与水的质量比）、水热温度以及TiOSO₄对微纳米Cu的相纯度和颗粒形貌的影响。研究结果表明:在pH=3～12、m(茶)∶m(H₂O)=1∶100，反应温度为200℃的条件下，均可得到聚集态的球状金属Cu；降低茶水的浓度或反应温度，产物中存在Cu和Cu₂O两相，且随着茶水浓度或反应温度的降低，产物中Cu₂O的相对含量均逐渐升高；另外，在一次水热合成获得的单相Cu₂O中加入0.1gTiOSO₄并经过200℃、24h二次水热处理后，制备出长度为10～40μm、直径为0.4～0.9μm的一维棒状金属Cu。

关键词: 微尺度, 微纳米金属Cu, 绿茶茶水, 水热, 晶体形貌, 绿色合成, 还原

CLC Number:

Yu YE,Kailun ZHANG,Di HUO. Hydrothermal synthesis of micro/nano metallic copper using green tea water as both solvent and reductant[J]. Chemical Industry and Engineering Progress, 2019, 38(03): 1487-1493.

叶榆,张凯伦,霍地. 绿茶水热还原制备微纳米金属铜[J]. 化工进展, 2019, 38(03): 1487-1493.

Figures/Tables 6

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