Highly efficient visible photocatalytic disinfection and degradation performances of microtubular nanoporous g-C3N4 via hierarchical construction and defects engineering
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第14期
论文作者：Jing Xu Zhouping Wang Yongfa Zhu
文章页码：133 - 143
摘 要：Herein, microtubular nanoporous g-C3 N4（TPCN） with hierarchical structure and nitrogen defects was prepared via a facile self-templating approach. On one hand, the hexagonal tubular structure can facilitate the light reflection/scattering, provide internal/external active sites, and endow the electron with oriented transfer channels. The well-developed nanoporosity can result in large specific surface area and abundant accessible channels for charge migration. On the other hand, the existence of nitrogen vacancies can improve the light harvesting（ > 450 nm） and prompt charge separation by acting as the shallow charge traps. More NHxgroups in g-C3 N4 framework can promote the interlayer charge transport by generating hydrogen-bonding interaction between C3 N4 layers. Therefore, TPCN possessed highly efficient visible photocatalytic performances to effectively inactivate Escherichia coli（E. coli） cells and thoroughly mineralize organic pollutants. TPCN with the optimum bactericidal efficiency can completely inactivated5 × 106 cfu mL-1 of E. coli cells after 4 h of irradiation treatment, while about 74.4% of E. coli cells were killed by bulk g-C3 N4（BCN）. Meanwhile, the photodegradation rate of TPCN towards methylene blue,amaranth, and bisphenol A were almost 3.1, 2.5 and 1.6 times as fast as those of BCN. Furthermore, h+and ·O-2 were the reactive species in the photocatalytic process of TPCN system.
Jing Xu1,2,3,4，Zhouping Wang1,2,3,4，Yongfa Zhu5
1. State Key Laboratory of Food Science and Technology, Jiangnan University2. School of Food Science and Technology, Jiangnan University3. International Joint Laboratory on Food Safety, Jiangnan University4. Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University5. Department of Chemistry, Tsinghua University
摘 要：Herein, microtubular nanoporous g-C3 N4（TPCN） with hierarchical structure and nitrogen defects was prepared via a facile self-templating approach. On one hand, the hexagonal tubular structure can facilitate the light reflection/scattering, provide internal/external active sites, and endow the electron with oriented transfer channels. The well-developed nanoporosity can result in large specific surface area and abundant accessible channels for charge migration. On the other hand, the existence of nitrogen vacancies can improve the light harvesting（ > 450 nm） and prompt charge separation by acting as the shallow charge traps. More NHxgroups in g-C3 N4 framework can promote the interlayer charge transport by generating hydrogen-bonding interaction between C3 N4 layers. Therefore, TPCN possessed highly efficient visible photocatalytic performances to effectively inactivate Escherichia coli（E. coli） cells and thoroughly mineralize organic pollutants. TPCN with the optimum bactericidal efficiency can completely inactivated5 × 106 cfu mL-1 of E. coli cells after 4 h of irradiation treatment, while about 74.4% of E. coli cells were killed by bulk g-C3 N4（BCN）. Meanwhile, the photodegradation rate of TPCN towards methylene blue,amaranth, and bisphenol A were almost 3.1, 2.5 and 1.6 times as fast as those of BCN. Furthermore, h+and ·O-2 were the reactive species in the photocatalytic process of TPCN system.
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