Abstract:

Fe₃O₄ magnetic nanoparticles synthesized by co-precipitation method was used as the heterogeneous catalyst to catalyze the degradation of organic wastewater by NaClO, and methylene blue(MB) was chosen as the target pollutant. Another efficient heterogeneous NaClO catalyst synthesized by the hydrothermal method-NiFe₂O₄ magnetic nanoparticles was studied for the first time. The results showed that after 30 minutes reaction at pH=8, the degradation rates of MB in the Fe₃O₄ system and NiFe₂O₄ system were 96.6% and 99.7%, respectively. Free radical scavenging tests proved that the catalysts could catalyze NaClO to generate the ·OH and ·OOH to decompose methylene blue. In addition, the catalysts successfully maintained stable catalytic performance after five cycling runs, and they could be conveniently recycled.

Key words: Fe₃O₄ magnetic nanoparticles, NiFe₂O₄ magnetic nanoparticles, NaClO, methylene blue, free radicals

摘要：

以共沉淀法合成了Fe₃O₄磁性纳米颗粒，并以亚甲基蓝（MB）为处理对象，进行了非均相催化NaClO降解有机废水的研究，同时首次研究了以水热法合成的另一种高效NaClO催化剂——NiFe₂O₄磁性纳米颗粒。研究表明，当pH=8时，催化反应30 min，Fe₃O₄体系和NiFe₂O₄体系的MB降解率分别为96.6%和99.7%。自由基清除实验表明，催化剂能催化NaClO产生·OH和·OOH自由基来去除MB。5次重复使用后，催化剂能保持稳定不失活，而且可以便捷地回收再利用。

关键词: Fe₃O₄磁性纳米颗粒, NiFe₂O₄磁性纳米颗粒, NaClO, 亚甲基蓝, 自由基

CLC Number: 

• X703