CdS Aerogels as Efficient Photocatalysts for Degradation of Organic Dyes under Visible Light Irradiation.
CdS Aerogels as Efficient Photocatalysts for Degradation of Organic Dyes under Visible Light Irradiation.
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DOI：
10.1039/c7qi00140a
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发表时间：
2017
影响因子：
7
通讯作者：
Brock SL
中科院分区：
文献类型：
--
作者：
Korala L;Germain JR;Chen E;Pala IR;Li D;Brock SL
用于有机废水氧化分解的基于 CdS 纳米材料的高效光催化剂的合成通常侧重于 (a) 催化剂表面积的增加和 (b) 促进光生电子-空穴对的分离。 CdS 气凝胶是通过将离散纳米晶体 (NC) 简单溶胶-凝胶组装成多孔网络，然后进行超临界干燥而合成的，由于 NC 之间通过共价键直接接触，可以为光催化反应提供更高的表面积，并且易于电荷分离。我们使用亚甲基蓝 (MB) 和甲基橙 (MO) 作为测试案例，评估了 CdS 气凝胶材料降解有机染料的效率。与典型的配体封端的 CdS NC 相比，CdS 气凝胶材料对染料降解表现出显着的光催化活性。通过减少链长和表面有机物的范围，进一步提高 CdS 气凝胶的催化效率，从而获得更高、更亲水的可及表面积。使用基于硫族化物的多孔固态结构进行光催化可以轻松分离催化剂，同时确保分析物反应性和可见光活化的高界面表面积。 CdS 气凝胶光催化剂具有高界面表面积，可实现分析物反应和可见光激活。
Synthesis of efficient photocatalysts based on CdS nanomaterials for oxidative decomposition of organic effluents typically focuses on (a) enhancement of surface area of the catalysts and (b) promotion of the separation of photogenerated electron-hole pairs. CdS aerogel, which are synthesized by simple sol–gel assembly of discrete nanocrystals (NCs) into a porous network followed by supercritical drying, could provide higher surface area for photocatalytic reactions along with facile charge separation due to direct contact between NCs via covalent bonding. We evaluated the efficiency of CdS aerogel materials for degradation of organic dyes using methylene blue (MB) and methyl orange (MO) as test cases. CdS aerogel materials exhibited remarkable photocatalytic activity for dye degradation compared to typical, ligand-capped CdS NCs. The catalytic efficiency of CdS aerogels was further improved by decreasing the chain-length and extent of surface organics, leading to higher, and more hydrophilic, accessible surface area. The use of porous, chalcogenide-based solid state architectures for photocatalysis enables easy separation of catalyst while ensuring a high-interfacial surface area for analyte reactivity and visible light activation. CdS aerogel photocatalysts enable a high-interfacial surface area for analyte reactivity and visible light activation.