负载Cu-Co纳米氧化物高效催化氧化水合肼研究

Study of Supported Cu- Co Composite Oxide Nanoparticles as a Highly Efficient Catalyst for Hydrazine Degradation

催化湿式过氧化氢技术(CWPO)以廉价易得的H2O2作为氧化剂,不仅可以使反应在常温常压下进行,而且H2O2分解产生的羟基自由基OH·具有很强的氧化能力,能氧化绝大多数有机物,且氧化速度较快,是处理难降解物质的重要方法之一。催化剂是催化湿式过氧化氢技术的关键,研究和开发新型高效稳定的催化剂,对于催化湿式过氧化氢技术在废水处理领域的推广应用更是至关重要。本文以肼废水为处理对象,探讨了负载型催化剂在CWPO工艺中对肼废水的催化降解活性。采用浸渍法分别制备Cu O-γ/Al2O3催化剂和钴改性Cu O-Co3O4-γ/Al2O3催化剂在CWPO工艺中对高COD的肼废水的催化降解活性进行对比。相较于Cu O-γ/Al2O3,含Co的催化剂在催化降解水合肼废水上具有更高的催化活性和稳定性。在反应温度60℃,起始p H=8.0,3 m L/L的H2O2的条件下,5%Cu O-0.5%Co3O4-γ/Al2O3催化剂催化降解40 min后COD的去除率达到91.5%。该纳米催化剂能够广泛运用于环境污染物处理上。

Catalystic wet peroxide oxidation treatment was considered one of the most promising and effective methods of degradating organic pollutants due to its high mineralization efficiency, which relied on strong oxidation property of hydroxyl radicals produced by H2 O2 oxidant. As the key of CWPO, it was essential to development of new, highly efficient and stable catalysts and application of CWPO in the field of waste water degradation. The sup-ported composite oxide nanoparticles of CuO-γ/Al2 O3 and CuO-Co3 O4 -γ/Al2 O3 were prepared by the methods of two-step impregnation and calcination, and evaluated through the CWPO treatment of hydrazine wastewater in the high COD conditions. Compared with CuO-γ/Al2 O3 , cobalt-containing samples embody higher catalytic activity and stability in catalytic decomposition of hydrazine wastewater. At the reaction temperature of 60 ？ C, initial pH of 8. 0, and the 3 mL/L dosage of peroxide, 91. 5% COD removal efficiency with the 5%CuO-0. 5%Co3 O4 -γ/Al2 O3 catalyst in 40 minute were obtained. It is expected that the composite supported nanocatalysts would be widely used in environmental pollution control.