Novel visible light induced Co3O4-g-C3N4 heterojunction photocatalysts for efficient degradation of methyl orange
Novel visible light induced Co3O4-g-C3N4 heterojunction photocatalysts for efficient degradation of methyl orange
复制标题
新型可见光诱导Co3O4-g-C3N4异质结光催化剂有效降解甲基橙
DOI：
10.1016/j.apcatb.2013.09.038
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发表时间：
2014-04-05
影响因子：
22.1
通讯作者：
Guo, Lele
中科院分区：
文献类型：
--
作者：
Han, Changcun;Ge, Lei;Guo, Lele
Novel visible-light-induced Co3O4-g-C3N4 heterojunction photocatalysts were synthesized via a facile mixing-and-heating method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible diffuse reflection spectroscopy (DRS), electron spin resonance (ESR) and photoluminescence spectroscopy (PL). The heterojunction photocatalysts exhibit a significantly enhanced photocatalytic activity in degrading methyl orange (MO). The optimal Co3O4 content with the highest photocatalytic activity was determined to be 0.2 wt%. The synergetic effect between Co3O4 and g-C3N4 plays an important role in promoting photo-generated carrier separation. The ESR and PL results reveals that the enhanced photocatalytic activity of Co3O4-g-C3N4 was mainly due to the superior amount and longer lifetime of oxidative radicals (O-.(2)-), as well as the efficient separation of charge carriers. Possible mechanism is proposed for the high photocatalytic activity of heterojunction structures, to guide the design of photocatalysts. (C) 2013 Elsevier B.V. All rights reserved.
