Heterostructured Nitrogen and Sulfur co-doped Black TiO₂/g-C₃N₄ Photocatalyst with Enhanced Photocatalytic Activity

Abstract

Conventional titanium dioxide(TiO₂) photocatalyst could absorb only ultraviolet light due to its wide bandgap. In this paper, black TiO₂ with narrow bandgap was prepared by introducing oxygen vacancies. Meanwhile, nitrogen(N) and sulfur(S) elements were doped to further broaden the visible light response range of TiO₂(NS-BT), and then heterostructured N,S-doped black TiO₂/g-C₃N₄(CN/NS-BT) was successfully constructed by easily accessible route. The formation of CN/NS-BT heterojunction structure increased the generation and separation efficiency of photogenerated electron-hole pairs, as well as accelerated the transfer rate of the carriers. The as-prepared CN/NS-BT exhibited excellent photocatalytic performance towards the degradation of Rhodamine B(RhB) under visible light irradiation with satisfactory stability. The apparent reaction rate constant of CN/NS-BT(0.0079) was 15.8-fold higher than that of commercial P25(0.0005). The structure, morphology, chemical composition and optical properties of the as-prepared CN/NS-BT were characterized by various analytical methods, and possible photocatalytic enhancement mechanism was proposed. Overall, CN/NS-BT composites look promising as photocatalytic material for future environmental treatment.

Keywords

Black TiO₂ / g-C₃N₄ / N, S doping / Heterostructure photocatalyst / Visible light photodegradation

References

[1] Hoffman M R, Martin S T, Choi W, Bahnemann D W. Chem. Rev., 1995, 95: 69.

[2] Tran P D, Wong L H, Barber J, Loo J S C. Energy Environ. Sci., 2012, 5: 5902.

[3] Zhang N, Zhang Y, Xu Y J. Nanoscale, 2012, 4: 5792.

[4] Li Y X, Hong H T, Xue X, Zhang Z, Tian H W. Chemistry Select, 2019, 18: 5222.

[5] Tang H, Huang H, Wang X S, Wu K Q, Tang G G, Li C S. Appl. Surf. Sci., 201, 379: 296.

[6] Liu M, Xue X, Yu S S, Wang X Y, Hu X Y, Tian H W, Chen H, Zheng W T. Sci. Rep., 2017, 7: 3637.

[7] Li S S, Wang W L, Li Y D. Appl. Catal. B: Environ., 2019, 254: 145.

[8] Fujishima A, Honda K. Nature, 1972, 238: 37.

[9] Chen J, Ollis D F, Rulkens W H, Bruning H. Water Res., 1999, 33: 669.

[10] Gupta S M, Tripathi M. Chin. Sci. Bull., 2011, 56: 1639.

[11] Xia X H, Liang Y, Wang Z, Fan J, Luo Y S, Jia Z J. Mater. Res. Bull., 2008, 43: 2187.

[12] Wang X, Maeda K, Thomas A, Takanabe K, Xin G, Carlsson J M, Domen K, Antonietti M. Nat. Mater., 2008, 8: 76.

[13] Tian H W, Liu M, Zheng W T. Appl. Catal. B: Environ., 2018, 225: 468.

[14] Wang Y Y, Sun L J, Raziq F. Adv. Energy Mater., 2018, 8: 1701580.

[15] Li X B, Xiong J, Huang J T, Feng Z J, Luo J M. J. Alloys Compd., 2019, 774: 768.

[16] Li X B, Xiong J, Xu Y, Feng Z J, Huang J T. Chinese J. Catal., 2019, 40: 424.

[17] Ong W J, Tan L L, Ng Y H, Yong S T, Chai S P. Chem. Rev., 201, 116: 7159.

[18] Shen K, Xue X, Wang X Y, Hu X Y, Tian H W, Zheng W T. RSC Adv., 2017, 7: 23319.

[19] Montoya A T, Gillan E G. ACS Omega, 2018, 3: 2947.

[20] Tian H W, Wan C X, Xue X, Hu X Y, Wang X Y. Catalysts, 2017, 7: 156.

[21] Zhou B, Hong H T, Zhang H F, Yu S S, Tian H W. J. Chem. Tech. Biotech., 2019, 94: 3806.

[22] Tian H W, Shen K, Hu X Y, Qiao L, Zheng W T. J. Alloys Compd., 2017, 691: 369.

[23] Chen X, Liu L, Yu P Y, Mao S S. Science, 2011, 331: 746.

[24] Lin T, Yang C, Wang Z, Yin H, Lü X, Huang F, Lin J, Xie X, Jiang M. Energy Environ. Sci., 2014, 7: 967.

[25] Jedsukontorn T, Ueno T, Saito N, Hunsom M. J. Alloys Compd., 2017, 726: 567.

[26] Xiang Q, Yu J, Jaroniec M. Chem. Soc. Rev., 2012, 41: 782.

[27] Yan H, Tian X, Pang Y, Feng B, Duan K, Zhou Z, Weng J, Wang J. RSC Adv., 201, 6: 102444.

[28] Hu S, Ma L, Li F, Fan Z, Wang Q, Bai J, Kang X, Wu G. RSC Adv., 2015, 5: 90750.

[29] Tauc J. Mater. Res. Bull., 1970, 5: 721.

[30] He R, Zhou J, Fu H, Zhang S, Jiang C. Appl. Surf. Sci., 2018, 430: 273.

[31] Cui L, Ding X, Wang Y, Shi H, Huang L, Zuo Y, Kang S. Appl. Surf. Sci., 2017, 391: 202.

[32] Wang Y, Yang W, Chen X, Wang J, Zhu Y. Appl. Catal. B: Environ., 2018, 220: 337.

[33] Zhou T T, Zhao F H, Cui Y Q, Chen L X, Yan J S, Wang X X, Long Y Z. Polymers, 2019, 12(1): 55.