Effects of heat treatment on the structure and photocatalytic activity of polymer carbon nitride
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Heat treatment technology is usually used for the processing of metal materials. In this paper, polymer carbon nitride (g-C3N4) is secondarily calcined at 590 °C. A series of nitrogen-doped g-C3N4 are obtained by adjusting the holding time. The doping of nitrogen atoms changes the electronic structure of the catalyst and narrows the band gap. In addition, the escape of ammonia during the secondary calcinations leads to the increase in the specific surface area of the catalyst, which is helpful to enhance the photosensitization effect. Among them, the sample obtained by holding time at 2 h has the highest photogenerated carrier separation efficiency, the largest specific surface area and the best photocatalytic degradation of methylene blue.
This work is supported by the Postdoctoral Science Foundation of China (2015M571913) and the National Nature Science Foundation of China (21401001).
- 8.Yan X, Zhao H, Li T, Zhang W, Liu Q, Yuan Y, Huang L, Yao L, Yao J, Su H, Su H, Gu J, Zhang D (2019) In situ synthesis of BiOCl nanosheets on three dimensional hierarchical structures for efficient photocatalysis under visible light. Nanoscale 11:10203–10208. https://doi.org/10.1039/C9NR02304F CrossRefGoogle Scholar
- 13.Lin B, Li H, An H, Hao WB, Wei JJ, Dai YZ, Ma CS, Yang GD (2018) Preparation of 2D/2D g-C3N4 nanosheet@ZnIn2S4 nanoleaf heterojunctions with well-designed high-speed charge transfer nanochannels towards high-efficiency photocatalytic hydrogen evolution. Appl Catal B 220:542–552. https://doi.org/10.1016/j.apcatb.2017.08.071 CrossRefGoogle Scholar
- 14.Wen JQ, Xie J, Zhang HD, Zhang AP, Liu YJ, Chen XB, Li X (2017) Constructing Multifunctional Metallic Ni Interface Layers in the g-C3N4 nanosheets/amorphous NiS heterojunctions for efficient photocatalytic H2 generation. ACS Appl Mater Interfaces 9:14031–14042. https://doi.org/10.1021/acsami.7b02701 CrossRefGoogle Scholar
- 19.Hasija V, Raizada P, Sudhaik A, Sharma K, Kumar A, Singh P, Jonnalagadda SB, Thakur VK (2019) Recent advances in noble metal free doped graphitic carbon nitride basednanohybrids for photocatalysis of organic contaminants in water: a review. Appl Mater Today 15:494–524. https://doi.org/10.1016/j.apmt.2019.04.003 CrossRefGoogle Scholar
- 22.Jiang L, Yuan X, Zeng G, Liang J, Wu Z, Yu H, Mo D, Wang H, Xiao Z, Zhou C (2019) Nitrogen self-doped g-C3N4 nanosheets with tunable band structures for enhanced photocatalytic tetracycline degradation. J. Colloid Interface Sci 536:17–29. https://doi.org/10.1016/j.jcis.2018.10.033 CrossRefGoogle Scholar
- 28.Sabzi M, Dezfuli SM (2018) Post weld heat treatment of hypereutectoid hadfield steel: characterization and control of microstructure, phase equilibrium, mechanical properties and fracture mode of welding joint. J Manuf Process 34:313–328. https://doi.org/10.1016/j.jmapro.2018.06.009 CrossRefGoogle Scholar
- 31.Lotsch BV, Dçblinger M, Sehnert J, Seyfarth L, Senker J, Oeckler O, Schnick W (2007) Unmasking melon by a complementary approach employing electron diffraction, solid-state NMR spectroscopy, and theoretical calculations-structural characterization of a carbon nitride polymer. Chem Eur J 13:4969–4980. https://doi.org/10.1002/chem.200601759 CrossRefGoogle Scholar
- 34.Feng DQ, Cheng YH, He J, Zheng LC, Shao DW, Wang WC, Wang WH, Lu F, Dong H, Liu H, Zheng RK, Liu H (2017) Enhanced photocatalytic activities of g-C3N4 with large specific surfacearea via a facile one-step synthesis process. Carbon 125:454–463. https://doi.org/10.1016/j.carbon.2017.09.084 CrossRefGoogle Scholar
- 40.She X, Liu L, Ji H, Mo Z, Li Y, Huang L, Du DL, Xu H, Li HM (2016) Template-free synthesis of 2D porous ultrathin nonmetal-doped g-C3N4 nanosheets with highly efficientphotocatalytic H2 evolution from water under visible light. Appl Catal B 187:144–153. https://doi.org/10.1016/j.apcatb.2015.12.046 CrossRefGoogle Scholar
- 41.Zhang S, Liu Y, Gu P, Ma R, Wen T, Zhao G, Li L, Ai Y, Hu C, Wang X (2019) Enhanced photodegradation of toxic organic pollutants using dual-oxygendoped porous g-C3N4: mechanism exploration from both experimental and DFT studies. Appl Catal B 248:1–10. https://doi.org/10.1016/j.apcatb.2019.02.008 CrossRefGoogle Scholar