摘要：

采用低温水浴法制备了花簇状纳米ZnO，并对样品进行了表征。以亚甲基蓝（MB）为目标污染物进行光催化实验。结果表明：水浴2 h，温度为45℃，n（OH-）：n（Zn²⁺）=8的条件下所制备的花簇状纳米ZnO的光催化性能最强；光催化反应的最佳反应条件分别为：催化剂投加量0.6 g/L，pH=9，反应150 min，MB溶液初始质量浓度为3 mg/L。当催化体系加入H₂O₂或Na₂S₂O₈时，产生的·OH和SO₄^·-对MB的去除有促进作用；废水共存离子CO₃^2-对MB去除的抑制作用强于HCO₃^-。催化剂循环利用4次后仍有较好的稳定性，MB去除率仍达89.3%。

关键词: 纳米ZnO, 水热法, 光催化, 亚甲基蓝, 印染废水

Abstract:

Flower cluster nano-ZnO was prepared by low temperature water bath method, and the samples were characterized. A photocatalytic experiment was carried out with methylene blue(MB) as the target pollutant. The results show that when the water bath time is 2 h, n(OH-): n(Zn²⁺) is 8, and the temperature is 45℃, the photocatalytic performance of the flower cluster nano-ZnO is the strongest; The optimal reaction conditions for the photocatalytic reaction were: catalyst dosage 0.6 g/L, pH=9, reaction for 150 min, and the initial mass concentration of MB solution at 3 mg/L. When H₂O₂ or Na₂S₂O₈ is added to the catalytic system, ·OH and SO₄^·- will be generated to promote the removal of MB. The co-existing ion CO₃^2- in the wastewater has a stronger inhibitory effect on MB removal than HCO₃^-. The catalyst has good stability after cycling 4 times and the MB removal rate is still 89.3%.

Key words: Nano-ZnO, hydrothermal method, photocatalysis, methylene blue, dyeing wastewater

中图分类号: 

• X703.1