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微波辅助溶胶-凝胶法一步合成纳米氧化锌及其催化降解性能研究

Keywords: 微波技术,光催化降解,纳米氧化锌

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Abstract:

以乙酸锌和氢氧化锂为原料,以无水乙醇为溶剂,采用微波辅助溶胶-凝胶法一步制备了纳米ZnO,用X射线衍射、紫外-可见吸收光谱、电子显微镜和电子能谱对其进行了表征.用紫外光作为光源,一定浓度的活性艳蓝为光催化反应模型污染物,研究了在不同反应时间下微波辐射合成的ZnO光催化性能并与传统溶胶-凝胶法合成的纯氧化锌作比较.结果表明,采用微波法合成的ZnO吸收边蓝移,粒径变小,光催化活性提高;微波辐射30min合成的ZnO光催化性能最好,当催化剂用量为10mg,对质量浓度为20mg/L的活性艳蓝溶液100mL的降解率40min达到90%.

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