Facile synthesis of g-C3N4/ZnO composite with enhanced visible light photooxidation and photoreduction properties
Facile synthesis of g-C3N4/ZnO composite with enhanced visible light photooxidation and photoreduction properties
复制标题
轻松合成具有增强可见光光氧化和光还原性能的 g-C3N4/ZnO 复合材料
DOI：
10.1016/j.cej.2012.08.033
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发表时间：
2012-10-15
影响因子：
15.1
通讯作者：
Chen, Shifu
中科院分区：
文献类型：
--
作者：
Liu, Wei;Wang, Mingliang;Chen, Shifu
采用沉积-沉淀法制备了g-C3 N4/ZnO复合光催化剂。采用XRD、SEM、TEM、DRS、TA-PL等手段对催化剂进行了表征。在可见光照射下，以RhB的光氧化和Cr 6+的光还原反应评价了该光催化剂的光催化性能。结果表明，该光催化剂的光催化性能明显优于单一的C3 N4和ZnO。复合材料中g-C_3 N_4的最佳含量为5.0wt.%。光氧化和光还原过程都遵循一级动力学。RhB对g-C3 N4（5.0 wt.%）/ ZnO为0.0367 min（-1），而纯C3 N4仅为0.0112 min（-1）。Cr ~（6+）在g-C_3N_4（5.0wt.%）/ ZnO是纯C3 N4的五倍以上。考察了所制备的光催化剂在光催化过程中的稳定性。增强的可见光催化性能源于C3 N4的CB向ZnO的CB注入激发电子。(C)2012爱思唯尔有限公司版权所有。
The composite photocatalyst g-C3N4/ZnO was synthesized by heat treatment of the precursor obtained via the deposition-precipitation method. The photocatalyst was characterized by XRD, SEM, TEM, DRS, and TA-PL. The photocatalytic properties of the photocatalyst were evaluated by photooxidation of RhB and photoreduction of Cr6+ under visible light irradiation. The results showed that the photocatalytic properties of the photocatalyst were much better than that of single C3N4 or ZnO. The optimal g-C3N4 content in the composite is 5.0 wt.%. Both photooxidation and photoreduction processes follow first-order kinetics. The photooxidation rate constant of RhB for g-C3N4(5.0 wt.%)/ZnO is 0.0367 min(-1), while it is only 0.0112 min(-1) for pure C3N4. The photoreduction rate constant of Cr6+ for g-C3N4(5.0 wt.%)/ZnO is more than five times that observed for pure C3N4. The stability of the prepared photocatalyst in the photocatalytic process was also investigated. The enhanced visible photocatalytic properties originate from the injection of excited electrons from the CB of C3N4 to that of ZnO. (C) 2012 Elsevier B.V. All rights reserved.