Magnetically Separable ZnFe2O4-Graphene Catalyst and its High Photocatalytic Performance under Visible Light Irradiation
Magnetically Separable ZnFe2O4-Graphene Catalyst and its High Photocatalytic Performance under Visible Light Irradiation
复制标题
磁可分离ZnFe2O4-石墨烯催化剂及其可见光照射下的高光催化性能
DOI：
10.1021/ie200162a
复制
发表时间：
2011-06-15
影响因子：
4.2
通讯作者：
Wang, Xin
中科院分区：
文献类型：
--
作者：
Fu, Yongsheng;Wang, Xin
采用一步水热法制备了不同石墨烯含量的磁性纳米复合光催化剂。该纳米复合光催化剂中的石墨烯片层被剥离，并用纳米晶ZnFe2O4修饰。结果表明，在过氧化氢存在下，可见光照射5min，亚甲基蓝的光降解率可达88%，照射90 mm后，亚甲基蓝的光降解率可达99%。与纯的ZnFe2O4催化剂相比，在可见光照射下，ZnFe2O4-石墨烯既是MB光电化学降解的催化剂，又是H_2O_2光电分解产生强氧化性羟基自由基(中心点OH)的催化剂。ZnFe2O4纳米粒子本身具有磁性，这使得ZnFe2O4-石墨烯复合材料在悬浮体系中是可磁分离的，因此它不需要像通常情况下那样增加磁性元件。
A magnetically separable ZnFe2O4-graphene nanocomposite photocatalyst with different graphene content was prepared by a facile one-step hydrothermal method. The graphene sheets in this nanocomposite photocatalyst are exfoliated and decorated with ZnFe2O4 nanocrystals. It was found that in the presence of H2O2, the photodegradation rate of methylene blue (MB) was 88% after visible light irradiation for only 5 min and reached up to 99% after irradiation for 90 mm. In comparison with pure ZnFe2O4 catalyst, ZnFe2O4-graphene serves a dual function as the catalyst for photoelectrochemical degradation of MB and the generator of a strong oxidant hydroxyl radical (center dot OH) via photoelectrochemical decomposition of H2O2 under visible light irradiation. ZnFe2O4 nanoparticles themselves have a magnetic property, which makes the ZnFe2O4-graphene composite magnetically separable in a suspension system, and therefore it does not require additional magnetic components as is the usual case.