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Controllable fabrication of a novel heterojunction composite: AgBr and Ag@Ag2O co-modified Ag2CO3 with excellent photocatalytic performance towards refractory pollutant degradation
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nj04133k Chao Liang 1, 2, 3, 4, 5 , Cheng-Gang Niu 1, 2, 3, 4, 5 , Mao-Cai Shen 1, 2, 3, 4, 5 , Shi-Feng Yang 1, 2, 3, 4, 5 , Guang-Ming Zeng 1, 2, 3, 4, 5
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-01-15 00:00:00 , DOI: 10.1039/c7nj04133k Chao Liang 1, 2, 3, 4, 5 , Cheng-Gang Niu 1, 2, 3, 4, 5 , Mao-Cai Shen 1, 2, 3, 4, 5 , Shi-Feng Yang 1, 2, 3, 4, 5 , Guang-Ming Zeng 1, 2, 3, 4, 5
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A novel visible-light-driven composite AgBr (15 wt%)/Ag@Ag2O/Ag2CO3 with different weight ratios of Ag2O was successfully fabricated via a facile chemical strategy. The heterojunction composite was characterized in terms of crystallinity, morphology, optical properties and composition. The optimized heterostructured catalyst exhibited superior photocatalytic performance in the degradation of methylene blue (MB) and ciprofloxacin (CIP) compared with the pristine and binary composites. The effects of initial concentration and light intensity were also investigated to study the practical application in the treatment of wastewater. The trapping experiment and ESR spin-trapping analysis verified that the active species of ˙O2− and h+ played a critical role in the degradation of organic pollutants. Moreover, the excellent photocatalytic performance was due to the formation of the heterojunction structure, the strong optical absorption ability and the ultra-fast transfer of electron–hole charge pairs resulting from the introduction of AgBr and Ag@Ag2O nanocomposites. In addition, a possible mechanism for the enhanced photocatalytic performance was proposed. This study gives a new insight into the fabrication of novel heterostructured photocatalysts for the real treatment of robust organic pollutants.
中文翻译：
可控地制备新型异质结复合材料：AgBr和Ag @ Ag 2 O共改性的Ag 2 CO 3，具有优异的光催化性能，可降解难降解的污染物
新型的可见光驱动复合AgBr（15重量％）/ Ag @ Ag 2 O / Ag 2 CO 3的不同重量比的Ag 2 O的成功制备。简便的化学策略。根据结晶度，形态，光学性质和组成对异质结复合材料进行了表征。与原始和二元复合材料相比，优化的异质结构催化剂在亚甲基蓝（MB）和环丙沙星（CIP）的降解中表现出优异的光催化性能。还研究了初始浓度和光强度的影响，以研究其在废水处理中的实际应用。捕集实验和ESR自旋捕获分析证实邻的活性物质2 -和H +在有机污染物的降解中起着至关重要的作用。此外，由于引入了AgBr和Ag @ Ag 2 O纳米复合材料，形成了异质结结构，强大的光吸收能力以及电子-空穴电荷对的超快速转移，因此具有出色的光催化性能。另外，提出了增强光催化性能的可能机理。这项研究为新型的异质结构光催化剂的制备提供了新的见解，用于实际处理坚固的有机污染物。
更新日期：2018-01-15
中文翻译：
可控地制备新型异质结复合材料：AgBr和Ag @ Ag 2 O共改性的Ag 2 CO 3，具有优异的光催化性能，可降解难降解的污染物
新型的可见光驱动复合AgBr（15重量％）/ Ag @ Ag 2 O / Ag 2 CO 3的不同重量比的Ag 2 O的成功制备。简便的化学策略。根据结晶度，形态，光学性质和组成对异质结复合材料进行了表征。与原始和二元复合材料相比，优化的异质结构催化剂在亚甲基蓝（MB）和环丙沙星（CIP）的降解中表现出优异的光催化性能。还研究了初始浓度和光强度的影响，以研究其在废水处理中的实际应用。捕集实验和ESR自旋捕获分析证实邻的活性物质2 -和H +在有机污染物的降解中起着至关重要的作用。此外，由于引入了AgBr和Ag @ Ag 2 O纳米复合材料，形成了异质结结构，强大的光吸收能力以及电子-空穴电荷对的超快速转移，因此具有出色的光催化性能。另外，提出了增强光催化性能的可能机理。这项研究为新型的异质结构光催化剂的制备提供了新的见解，用于实际处理坚固的有机污染物。
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