Facile fabrication of novel SiO2/g-C3N4 core-shell nanosphere photocatalysts with enhanced visible light activity
Facile fabrication of novel SiO2/g-C3N4 core-shell nanosphere photocatalysts with enhanced visible light activity
复制标题
轻松制备具有增强可见光活性的新型SiO2/g-C3N4核壳纳米球光催化剂
DOI：
10.1016/j.apsusc.2015.09.041
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发表时间：
2015-12-01
影响因子：
6.7
通讯作者：
Yang, Bolun
中科院分区：
文献类型：
--
作者：
Lin, Bo;Xue, Chao;Yang, Bolun
将SiO2纳米球与熔融的氨腈（CA）混合，在氮气保护下采用加热法简单地合成了新型SiO2/g-C3 N4核壳结构纳米球。系统研究了SiO2纳米球和CA分子的不同初始质量比对催化剂结构、表面性质和催化活性的影响。表征结果表明，所制备的光催化剂具有有序的核壳纳米结构、大的介孔分布和膨胀的BET比表面积。以罗丹明B（RhB）染料为目标染料，在可见光照射下考察了SiO2/g-C3 N4复合材料的光催化活性。与纯γ-C3 N4相比，所有SiO2/g-C3 N4核壳复合物的光催化活性均有所提高，其中最佳SiO2/g-C3 N4催化剂（SC-3）的活性最高，可见光照射150 min后RhB转化率为94.3%，是纯g-C3 N4的3.5倍。同时，循环试验表明，SC-3样品具有优异的稳定性和耐久性。活性和稳定性的增强可以归因于特定的核-壳结构、膨胀的表面积、更高的可见光吸收和源自SiO2纳米球和g-C3 N4之间紧密接触的界面的有效电荷分离。(C)2015 Elsevier B. V.版权所有。
Novel SiO2/g-C3N4 core-shell nanospheres were simply synthesized using heating method to anneal the mixture of silica dioxide nanospheres and molten cyanamide (CA) in nitrogen atmosphere. The effects of various initial mass ratios of SiO2 nanospheres and CA molecules on the catalyst structure, surface property and catalytic activity have been systematically investigated. The characterization results show that the as-obtained photocatalysts possess the ordered core-shell nano structure, large me soporous distribution and inflated BET specific surface areas. The photocatalytic activities of the SiO2/g-C3N4 composites were evaluated by decomposing the rhodamine B (RhB) dye under visible light irradiation. Compared with pure gamma-C3N4, all of the SiO2/g-C3N4 core-shell composites showed the improved photoactivity, and the optimal SiO2/g-C3N4 catalyst (SC-3) showed the highest activity with an RhB conversion of 94.3% after 150 min visible light irradiation, which is 3.5 times higher than that of pure g-C3N4. Meanwhile, the recycling test showed that the SC-3 sample owns outstanding stability and durability. The enhancement in both activity and stability can be assigned to the specific core-shell structure, inflated surface area, higher visible light adsorption and efficient charge separation originating from the closely contacted interfaces between SiO2 nanospheres and g-C3N4. (C) 2015 Elsevier B.V. All rights reserved.