"Alternated cooling and heating" strategy enables rapid fabrication of highly-crystalline g-C3N4 nanosheets for efficient photocatalytic water purification under visible light irradiation
"Alternated cooling and heating" strategy enables rapid fabrication of highly-crystalline g-C3N4 nanosheets for efficient photocatalytic water purification under visible light irradiation
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“交替冷却和加热”策略可快速制造高结晶 g-C3N4 纳米片，用于可见光照射下的高效光催化水净化
DOI：
10.1016/j.carbon.2018.05.010
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发表时间：
2018-10
期刊：
影响因子：
10.9
通讯作者：
Hu Bing
中科院分区：
文献类型：
--
作者：
Kang Shifei;Zhang Lu;He Maofen;Zheng Yuanyi;Cui Lifeng;Sun Di;Hu Bing
具有低结构缺陷的高结晶二维石墨氮化碳（g-C3N4）纳米片通常具有高的光催化活性，这得益于抑制的电子-空穴复合。然而，传统的剥离策略无法快速、干净地从块状纳米片中制备出如此高质量的g- c3n4纳米片。通过巧妙地结合速冻和微波辅助热剥离，在10 min内合成了高结晶的少层g- c3n4纳米片。理化表征表明，超薄g- c3n4纳米片具有高结晶度、窄带隙（2.62 eV）、增大的比表面积（88.59 m2/g）和增强的电子传递能力。准二维少层g- c3n4纳米片在光催化水净化和消毒方面比块状g- c3n4更有效，在可见光照射下腐殖酸的光降解和对大肠杆菌的快速水消毒效果提高了3倍。这种改进主要归功于结构缺陷的减少和暴露活性位点的富集，这两者共同导致了电子-空穴复合的有效自抑制。这些发现为高活性二维材料的环境和生物应用的规模化和清洁生产提供了灵感。
Highly-crystalline 2-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets with low structural imperfection usually possess high photocatalytic activity that benefits from the suppressed electron–hole recombination. However, the conventional exfoliation strategy is incapable for fast and clean preparation of such highly-quality g-C3N4nanosheets from their bulk-type counterparts. Herein, highly-crystalline few-layer g-C3N4nanosheets were synthesized only within 10 min by judiciously combining flash freezing and microwave-assisted thermo-exfoliation. Physicochemical characterization showed the ultrathin g-C3N4nanosheets had high crystallinity, narrowed band gap (2.62 eV), enlarged specific surface area (88.59 m2/g) and enhanced electron transport ability. The quasi-2D few-layer g-C3N4nanosheets were more efficient than bulk g-C3N4in photocatalytic water purification and disinfection, as evidenced by 3-fold enhancement in humic acid photodegradation and fast water disinfection againstEscherichia coliunder visible-light irradiation. Such improvements were mainly attributed to the reduction of structural defects and enrichment of exposed active sites, which together led to efficient self-suppression of electron–hole recombination. These findings provide an inspiration for scale-up and clean production of highly-active 2D materials towards environmental and biological application.
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