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Surface construction of a novel metal-free g-C3N4-based heterojunction photocatalyst for the efficient removal of bio-toxic antibiotic residues
Applied Surface Science ( IF 6.7 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.apsusc.2021.151299
Yangqing He 1, 2 , Bei Ma 1 , Qian Yang 1 , Yu Tong 2 , Zhanying Ma 3 , Lucas Binnah Junior 1 , Binghua Yao 1
Affiliation  

The exploration of metal-free g-C3N4-based photocatalysts is recognized as one of the most effective approaches for remedying environmental pollution and ameliorating energy crisis. However, the simultaneous realization of a highly efficient, long-term stability and broad visible-light responsive photocatalysts remains a major desirable challenging goal in the area of photocatalysis. Herein, using N,N′-bis(p-carboxyl-phenylene) perylene-3,4:9,10-perylene bisimide (BCPP-PBI) as the efficient surface photovoltaic agent, a novel BCPP-PBI/g-C3N4 heterojunction is successfully constructed via an one-step acylation reaction for the first time. The optimized 1%BCPP-PBI/g-C3N4 composite exhibited significantly improved visible-light absorption capability for light with wavelength shorter than 658 nm and demonstrated remarkably enhanced photocatalytic performance in tetracycline degradation with high stability. Benefitting from the surface modification effect by incorporating BCPP-PBI onto g-C3N4, there is a significantly improved visible light harvesting capability, as well as, a highly efficient photoexcited charges carrier separation and transfer system in 1%BCPP-PBI/g-C3N4. The strong covalent chemical bond formed between BCPP-PBI and g-C3N4 enabled the BCPP-PBI molecules to serve as important electron sink which adopts electrons from g-C3N4. This study paves the way for the design of highly effective g-C3N4-based metal-free organic catalysts towards their practical utilization in the elimination of recalcitrant antibiotic pollutants from various real wastewaters.



中文翻译:

一种新型无金属 g-C3N4 基异质结光催化剂的表面构建,用于有效去除生物毒性抗生素残留

探索无金属gC 3 N 4基光催化剂被认为是解决环境污染和缓解能源危机的最有效途径之一。然而,同时实现高效、长期稳定性和广泛的可见光响应光催化剂仍然是光催化领域的主要理想挑战目标。在此,使用 N,N'-双(对羧基-亚苯基)苝-3,4:9,10-苝双酰亚胺(BCPP-PBI)作为高效的表面光伏剂,一种新型 BCPP-PBI/gC 3 N 4首次通过一步酰化反应成功构建了异质结。优化的 1%BCPP-PBI/gC 3 N 4复合材料对波长短于 658 nm 的光的可见光吸收能力显着提高,并在四环素降解中表现出显着增强的光催化性能和高稳定性。受益于通过将 BCPP-PBI 结合到 gC 3 N 4上的表面改性效果,显着提高了可见光捕获能力,以及在 1% BCPP-PBI/gC 3 中的高效光激发电荷载流子分离和转移系统ñ 4。BCPP-PBI与gC 3 N 4之间形成的强共价化学键使BCPP-PBI分子成为重要的电子汇,从gC中吸收电子3 N 4。该研究为设计高效的 gC 3 N 4基无金属有机催化剂铺平了道路,使其实际用于消除各种实际废水中的顽固抗生素污染物。

更新日期:2021-09-27
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