| g-C3N4 /CaTi2O5复合材料制备及其光催化性能 |
| Synthesis of C3N4 /CaTi2O5 composite and its photocatalytic properties |
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| 摘要: 利用类石墨氮化碳(g-C3N4)和亚稳相钙钛氧化物(CaTi2O5)固相法制备C3N4 /CaTi2O5复合材料。利用X射线衍射(XRD)、金相显微镜、扫描电子显微镜(SEM)及附带能谱分析仪(EDS)和比表面积分析仪(BET) 对样品的显微结构和比表面积进行检测分析,并用紫外-可见吸收光度计(uV-Vis)测试了样品的光吸收性能,研究C3N4 /CaTi2O5摩尔比对C3N4 /CaTi2O5复合样品的物相结构和微观形貌的影响,同时考察C3N4/CaTi2O5复合样品在可见光照射下光催化降解罗丹明染料效果。实验结果表明：相比纯C3N4和CaTi2O5样品,C3N4/CaTi2O5复合样品在可见光下具有较高的光催化性能,随着C3N4/CaTi2O5摩尔比增加,样品的光催化降解率随之增加而降低,当C3N4/CaTi2O5摩尔比为1:1时,样品的光催化降解率达到最大值0.01483 min-1,并且循环重复利用5次后,样品的光催化剂降解率仍几乎保持不变。复合样品光催化性能提高主要归因于复合能级结构有效地抑制了电子和空穴复合所致。该光催化的研制结果将对光催化领域降解污染物保护环境方面将具有广泛的应用前景。 |
| 关键词: g-C3N4 CaTi2O5 C3N4 /CaTi2O5复合材料 光催化 |
| 基金项目: 国家自然科学基金 |
| Abstract: C3N4/CaTi2O5 composite were prepared by a solid reaction method. The microstructure and surface area of the samples were characterized by X-ray diffraction( XRD), scanning electron microscopy (SEM) and the corresponding energy dispersiveSanalysis (EDS),and Brunauer–Emmett–Teller (BET). The absorption properties of the samples were analyzed by ultraviolet - visible absorption spectrophotometer (UV-Vis). Effects of C3N4 /CaTi2O5 mol ratio on phase and microstructure of the samples were studied. The photocatalytic degradation acitivity of C3N4 /CaTi2O5 composite for Rhodamine B (RhB) were examined under visible light irradiation. The experimental results showed that the composites exhibited higher photocatalytic activity than pure C3N4 orCaTi2O5. The photocatalytic activity of the composites increased then decreased with increasing C3N4 /CaTi2O5 content. The C3N4 /CaTi2O5 mol ratio of 1:1 exhibited the highest photocatalytic activity of K=0.01483 min-1. The enhanced photocatalytic activity of the C3N4 /CaTi2O5 photocatalyst was attributed predominantly to the efficient separation of photo induced electrons and holes. The C3N4 /CaTi2O5 photocatalyst kept almost unchanged,which indicated excellent stability and reusability after 5 cycles. This study provides a visible light responsive photocatalyst with potential in environmental remediation applications. |
| Keywords: C3N4 (graphite-like carbon nitride) CaTi2O5 C3N4 /CaTi2O5composites photocatalytic properties |
| 投稿时间：2016-08-25 修订日期：2016-12-18 |
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