Ag-Pd/g-C_3N_4的制备及在水溶液中选择性氧化苯甲醇

Preparation of Ag-Pd/g-C_3N_4 and Selective Oxidation of Benzyl Alcohol in Aqueous Solution

采用硼氢化钠还原法在g-C_3N_4的表面负载Ag和Pd纳米颗粒制备Ag/g-C_3N_4、 Pd/g-C_3N_4、 Ag-Pd/g-C_3N_4光催化剂.采用能谱仪、 X射线衍射、高分辨透射电子显微镜等技术对样品进行表征.结果显示, Ag-Pd/g-C_3N_4复合材料中C、 N、 Ag和Pd元素的质量百分数分别为22.718%、 59.966%、 9.132%和8.184%. Ag和Pd纳米颗粒负载在g-C_3N_4表面可提高材料在可见光区域的吸收以及提高苯甲醇的转化率,生成苯甲醛的选择性为85.6%.

The g-C3N4 is prepared by calcining method, and the Ag/g-C3N4, Pd/g-C3N4 and Ag-Pd/g-C3N4 photocatalysts are prepared via deposition of Ag and Pd nanoparticles on the surface of g-C3N4, with the reduction reagent of sodium borohydride. The as-prepared materials are characterized by energy spectrometer, X-ray diffraction, high resolution transmission electron microscopy. The mass percentages of C, N, Ag and Pd in the Ag-Pd/g-C3N4 composite were 22.718%、 59.966%、 9.132%和8.184%, respectively. The results indicated that Ag and Pd nanoparticles are successfully loaded on the g-C3N4 surface, the load of Ag and Pd nanoparticles increase the absorption of the material in visible light region and increase the conversion of benzyl alcohol. The selectivity to benzaldehyde is 85.6%.