Two-dimensional Bi2O2CO3/delta-Bi2O3/Ag2O heterojunction for high performance of photocatalytic activity
Two-dimensional Bi2O2CO3/delta-Bi2O3/Ag2O heterojunction for high performance of photocatalytic activity
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二维 Bi2O2CO3/delta-Bi2O3/Ag2O 异质结具有高性能光催化活性
DOI：
10.1016/j.apsusc.2020.146613
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发表时间：
2020
影响因子：
6.7
通讯作者：
Hu Chenguo
中科院分区：
文献类型：
--
作者：
Ran Hao;Lu Junlin;Wang Zhao;Wang Congcong;Li Jien;Zhang Cuiling;Wang Xue;He Xiaoyu;Hu Chenguo
近年来，二维层状材料以其高效的太阳能转换性能引起了人们的广泛关注。然而，二维层状材料通常通过强化学键或范德华相互作用由单个单层堆叠而成。因此，二维单层材料的制备仍然具有挑战性。本文通过简单的复合盐介导法制备了δ- bi2o3点缀成网状结构的单层bi2o2co3组合物，该组合物对有机污染物具有较强的吸附能力。Bi2O2CO3/δ-Bi2O3/Ag2O （BBA）复合材料表面负载Ag2O后，对亚甲基蓝（MB）的吸附能力较低，但光降解效率较高。在100 mW/cm2的模拟太阳光照射下，BBA-3在15 min内降解97%的MB，明显优于商用TiO2（P25）和Bi2O2CO3/δ-Bi2O3。二维结构中较短的扩散距离使得光激发载流子几乎不需要重组就能扩散到表面，并导致单层或几层两侧染料的有效光降解。这种新型的二维结构为开发高效光催化剂提供了新的思路。
Two-dimensional layered materials have attracted extensive interest recently due to their high efficiency solar energy conversion. However, 2D layered materials are usually stacked by individual monolayers through strong chemical bonds or van der Waal interactions. Therefore, it is still challenging to fabricate to 2D monolayered materials. Herein, monolayered Bi2O2CO3composition dotted with δ-Bi2O3assembling to a network structure is fabricated through a simple composite-salt mediated approach, which has strong adsorption of organic pollutant. After loaded Ag2O on the surface of it, Bi2O2CO3/δ-Bi2O3/Ag2O (BBA) composite exhibits a lower adsorption capability but higher photodegradation efficiency for methylene blue (MB). 97% MB is degraded by BBA-3 in 15 min under the irradiation of simulated sunlight of 100 mW/cm2, much better than that of commercial TiO2(P25) and Bi2O2CO3/δ-Bi2O3. The short diffusion distance in the two-dimensional structure enables photoexcited carriers to diffuse to the surfaces almost without recombination and leads to efficient photodegradation of dyes on both sides of a monolayer or few layers. This novel 2D structure brings a new idea for developing highly efficient photocatalyst.