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2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H2O2 Production and Activation toward Efficient Photocatalytic Wastewater Treatment
Small Methods ( IF 10.7 ) Pub Date : 2023-11-27 , DOI: 10.1002/smtd.202301368 Beverly Qian Ling Low 1 , Wenbin Jiang 1 , Jing Yang 2 , Mingsheng Zhang 1 , Xiao Wu 3 , Hui Zhu 3 , Houjuan Zhu 1 , Jerry Zhi Xiong Heng 4 , Karen Yuanting Tang 4 , Wen-Ya Wu 1 , Xun Cao 4 , Xue Qi Koh 1 , Casandra Hui Teng Chai 1 , Chui Yu Chan 4 , Qiang Zhu 1, 4 , Michel Bosman 5 , Yong-Wei Zhang 2 , Ming Zhao 5 , Zibiao Li 1, 4 , Xian Jun Loh 1, 4 , Yujie Xiong 6 , Enyi Ye 1, 4
Small Methods ( IF 10.7 ) Pub Date : 2023-11-27 , DOI: 10.1002/smtd.202301368 Beverly Qian Ling Low 1 , Wenbin Jiang 1 , Jing Yang 2 , Mingsheng Zhang 1 , Xiao Wu 3 , Hui Zhu 3 , Houjuan Zhu 1 , Jerry Zhi Xiong Heng 4 , Karen Yuanting Tang 4 , Wen-Ya Wu 1 , Xun Cao 4 , Xue Qi Koh 1 , Casandra Hui Teng Chai 1 , Chui Yu Chan 4 , Qiang Zhu 1, 4 , Michel Bosman 5 , Yong-Wei Zhang 2 , Ming Zhao 5 , Zibiao Li 1, 4 , Xian Jun Loh 1, 4 , Yujie Xiong 6 , Enyi Ye 1, 4
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The presence of toxic organic pollutants in aquatic environments poses significant threats to human health and global ecosystems. Photocatalysis that enables in situ production and activation of H2O2 presents a promising approach for pollutant removal; however, the processes of H2O2 production and activation potentially compete for active sites and charge carriers on the photocatalyst surface, leading to limited catalytic performance. Herein, a hierarchical 2D/2D heterojunction nanosphere composed of ultrathin BiOBr and BiOI nanosheets (BiOBr/BiOI) is developed by a one-pot microwave-assisted synthesis to achieve in situ H2O2 production and activation for efficient photocatalytic wastewater treatment. Various experimental and characterization results reveal that the BiOBr/BiOI heterojunction facilitates efficient electron transfer from BiOBr to BiOI, enabling the one-step two-electron O2 reduction for H2O2 production. Moreover, the ultrathin BiOI provides abundant active sites for H2O2 adsorption, promoting in situ H2O2 activation for •O2− generation. As a result, the BiOBr/BiOI hybrid exhibits excellent activity for pollutant degradation with an apparent rate constant of 0.141 min−1, which is 3.8 and 47.3 times that of pristine BiOBr and BiOI, respectively. This work expands the range of the materials suitable for in situ H2O2 production and activation, paving the way toward sustainable environmental remediation using solar energy.
中文翻译：
BiOBr/BiOI 纳米片的 2D/2D 异质结用于原位 H2O2 生产和活化，实现高效光催化废水处理
水生环境中有毒有机污染物的存在对人类健康和全球生态系统构成重大威胁。光催化能够原位产生和活化 H 2 O 2 ，为污染物去除提供了一种有前途的方法；然而，H 2 O 2的产生和活化过程可能会竞争光催化剂表面的活性位点和载流子，导致催化性能有限。在此，通过一锅微波辅助合成技术开发了由超薄BiOBr和BiOI纳米片组成的分层2D/2D异质结纳米球（BiOBr/BiOI），以实现原位H 2 O 2生产和活化，以实现高效光催化废水处理。各种实验和表征结果表明，BiOBr/BiOI异质结促进了从BiOBr到BiOI的有效电子转移，从而实现了一步双电子O 2还原以产生H 2 O 2 。此外，超薄BiOI为H 2 O 2吸附提供了丰富的活性位点，促进原位H 2 O 2活化以生成·O 2 - 。因此，BiOBr/BiOI杂化物表现出优异的污染物降解活性，表观速率常数为0.141 min -1 ，分别是原始BiOBr和BiOI的3.8和47.3倍。这项工作扩大了适用于原位 H 2 O 2生产和活化的材料范围，为利用太阳能进行可持续环境修复铺平了道路。
更新日期：2023-11-27
中文翻译：
BiOBr/BiOI 纳米片的 2D/2D 异质结用于原位 H2O2 生产和活化，实现高效光催化废水处理
水生环境中有毒有机污染物的存在对人类健康和全球生态系统构成重大威胁。光催化能够原位产生和活化 H 2 O 2 ，为污染物去除提供了一种有前途的方法；然而，H 2 O 2的产生和活化过程可能会竞争光催化剂表面的活性位点和载流子，导致催化性能有限。在此，通过一锅微波辅助合成技术开发了由超薄BiOBr和BiOI纳米片组成的分层2D/2D异质结纳米球（BiOBr/BiOI），以实现原位H 2 O 2生产和活化，以实现高效光催化废水处理。各种实验和表征结果表明，BiOBr/BiOI异质结促进了从BiOBr到BiOI的有效电子转移，从而实现了一步双电子O 2还原以产生H 2 O 2 。此外，超薄BiOI为H 2 O 2吸附提供了丰富的活性位点，促进原位H 2 O 2活化以生成·O 2 - 。因此，BiOBr/BiOI杂化物表现出优异的污染物降解活性，表观速率常数为0.141 min -1 ，分别是原始BiOBr和BiOI的3.8和47.3倍。这项工作扩大了适用于原位 H 2 O 2生产和活化的材料范围，为利用太阳能进行可持续环境修复铺平了道路。
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