Bi5O7I/g-C3N4Z型异质结的常温沉淀制备及其光催化性能研究

Abstract
Figure/Table
References
Related Citation (1)

Download: PDF (595 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In this work, by using Bi₅O₇ I、KI and g-C₃N₄ as precursors, a novel Bi₅O₇ I/g-C₃N₄ Z-scheme heterojunction has been synthesized successfully by precipitation method at room temperature, its property of light absorption、morphologic structure、efficiency of photogenerated electron-hole were characterized. The visible-light degradation performance on Rhodamine B(RhB)by new type composite photocatalyst、the kinds of radicals and the mechanism in photocatalytic reaction system were studied. The results revealed that:The synthesis conditions of Bi₅O₇ I/g-C₃N₄ by precipitation were shown as follow:4.85g Bi(NO₃)₃·5H₂O, 1.66g KI, 1.61g g-C₃N₄, 50mL glycol, 12 of reaction pH, 200r/min of reaction stirring rate and ambient reaction temperature(25℃).There's no impurity and influence on chemical structure of g-C₃N₄ and Bi₅O₇ I during the synthesis process, the recombination of Bi₅O₇I/g-C₃N₄ crystallographic plane occured on the {002} crystal plane of g-C₃N₄ and the {312} crystal plane of Bi₅O₇ I.The morphologic structure of Bi₅O₇ I/g-C₃N₄ was 3D nano petal-like, which furnished a large number of contacting site for the transfer of photogenerated electron-hole. The doping of g-C₃N₄ on Bi₅O₇ I can significantly enhance photocatalytic activity, its wavelength edge of light absorption shifted to 462nm from 425nm.The band arrangement structure of Bi₅O₇ I/g-C₃N₄ was matched with the Z-scheme heterojunction, which promoted the separation of photogenerated electron-hole, its photocurrent density (11.5mA/cm) is 2.66 and 1.47times than that of g-C₃N₄ (4.32mA/cm) and Bi₅O₇ I(7.8mA/cm) respectively. The photocatalytic degradation rate for RhB by Bi₅O₇I/g-C₃N₄ under visble light irradiation is 93.9%, which is 1.89 and 1.62times than that of Bi₅O₇ I and g-C₃N₄ respectively, the activity of photocatalytic oxidation was attributed to the intermediate radicals including ·OH、·O₂^- and h⁺.

Key words： precipitation method at room temperature Bi₅O₇ I/g-C₃N₄ Z-scheme heterojunction visible-light photocatalytic property

Received: 08 February 2021

PACS:

X703

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LI Dong-mei
	LU Wen-cong
	LIANG Yi-cong
	WANG Yi-zhi
	CHEN Hai-qiang
	LI Jun-tian
	XIE Zhen-yu

Cite this article:

LI Dong-mei,LU Wen-cong,LIANG Yi-cong等. Room-temperature precipitation synthesis and photocatalysis of Bi₅O₇I/g-C₃N₄ Z-scheme heterojunction[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4120-4126.

URL:

http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4120

[1]	Cai J, Zhou M, Pan Y, et al. Degradation of 2,4-dichlorophenoxyacetic acid by anodic oxidation and electro-Fenton using BDD anode:Influencing factors and mechanism[J]. Separation and Purification Technology, 2019,230:115867.
[2]	Fujishima A, Honda K. Electrochemical photolysis of water at a semiconductor electrode[J]. Nature, 1972,238(5358):37-38.
[3]	Yang L, Liang L, Wang L, et al. Accelerated photocatalytic oxidation of carbamazepine by a novel 3D hierarchical protonated g-C3N4/BiOBr heterojunction:Performance and mechanism[J]. Applied Surface Science, 2019,473(APR.15):527-539.
[4]	Vaizoullar A M. Ternary CdS/MoS2/ZnO photocatalyst:synthesis, characterization and degradation of ofloxacin under visible light irradiation[J]. Journal of Inorganic and Organometallic Polymers and Materials, 2020,(17).
[5]	Gao C, Wei T, Zhang Y, et al. A photoresponsive rutile TiO2 heterojunction with enhanced electron-hole separation for high-performance hydrogen evolution[J]. Advanced Materials. 2019,31(8):1806596-1806602.
[6]	Zhang Y L, Zhao Y L, Xiong Z, et al. Elemental mercury removal by I -doped Bi 2WO 6with remarkable visible-light-driven photocatalytic oxidation[J]. Applied Catalysis B:Environmental, 2020:282.
[7]	Khore S K, Kadam S R, Kale B B, et al. A green approach:scalable dry media synthesis of a γ-TaON photocatalyst for solar H2 production and rhodamine B degradation[J]. Sustainable Energy & Fuels, 2020:4.
[8]	王俏.基于二维超薄卤氧化铋的可见光催化降解水中氯酚的研究[D]. 哈尔滨:哈尔滨工业大学, 2019.Wang qiao. Degradation of chlorophenols in water by visible-light photocatalysts based on two-dimension ultrathin BIOX[D]. Harbin:Harbin Institute of Technology, 2019.
[9]	Eggenweiler U, Ketterer J, Keller E, et al. The crystal structure of α-Bi5O7I[J]. Zeitschrift für Kristallographie-Crystalline Materials, 2001,216(4).
[10]	Yang J, Xu L, Liu C, et al. Preparation and photocatalytic activity of porous Bi5O7I nanosheets[J]. Applied Surface Science, 2014,319:265-271.
[11]	梅邱峰,张飞燕,王宁,等.二氧化钛基Z型异质结光催化剂[J]. 无机化学学报, 2019,35(8):1321-1339.Mei Qiufeng, Zhang Feiyan, Wang Ning, et al. Photocatalysts:Z-scheme heterojunction constructed with titanium dioxide[J]. Chinese Journal of Inorganic Chemistry, 2019,35(8):1321-1339.
[12]	Zla B, Hu D C, Zw B, et al. Novel p-n type porous Ag 2O/Bi 5O 7I heterojunction for Uv-Vis-NIR activated high efficient photocatalytic degradation of bisphenol A:Photoelectric properties and degradation mechanism[J]. Applied Surface Science, 2020:529.
[13]	Zhang Y, Zhu G, Gao J, et al. Synthesis of plasmonic enhance sphere-like Ag/AgI/Bi5O7I photocatalysts with improved visible-light responsive activity under LED light irradiation[J]. Journal of Materials Science:Materials in Electronics, 2017,28(7):5460-5471.
[14]	Liu C, Huang H, Xin D, et al. In situ co-crystallization for fabrication of g-C3N4/Bi5O7I heterojunction for enhanced visible-light photocatalysis[J]. The Journal of Physical Chemistry C, 2015,119(30):17156-17165.
[15]	Geng Xueqi, Chen S, Lv X, et al. Synthesis of g-C3N4/Bi5O7I microspheres with enhanced photocatalytic activity under visible light[J]. Applied Surface Science, 2018,462:18-28.
[16]	张文东.BiOBr和C3N4的制备,表征及可见光催化氧化罗丹明B性能研究[D]. 重庆:重庆大学, 2015.Zhang Wendong. Preparation, characteration and visible light photocatalytic oxidation performance of BiOBr and C3N4 in Rhodamine B[D]. Chongqing:Chongqing University, 2015.
[17]	Sun Y, Zhang W, Xiong T, et al. Growth of BiOBr nanosheets on C3N4nanosheets to construct two-dimensional nanojunctions with enhanced photoreactivity for NO removal[J]. Journal of Colloid & Interface Science, 2014,418:317-323.
[18]	Zhao Z, Wang M, Yang T, et al. In situ co-precipitation for the synthesis of an Ag/AgBr/Bi5O7I heterojunction for enhanced visible-light photocatalysis[J]. Journal of Molecular Catalysis A Chemical, 2016,424:8-16.
[19]	Ying W, Jing W, Yunfang H, et al. Solvothermal synthesis of Bi2O3/BiVO4 heterojunction with enhanced visible-light photocatalytic performances[J]. Journal of Semiconductors, 2016,37(8):35-44.
[20]	Licht, Stuart. Multiple band gap semiconductor/electrolyte solar energy conversion[J]. Journal of Physical Chemistry B, 2001,105(27):10069-10077.
[21]	Ishibashi K I, Fujishima A, Watanabe T, et al. Detection of active oxidative species in TiO2 photocatalysis using the fluorescence Technique[J]. Electrochemistry Communications, 2000,2(3):207-210.
[22]	Geng Xueqi, Chen Shuai, Lv Xiang, et al. Synthesis of g-C_3N_4/Bi_5O_7I microspheres with enhanced photocatalytic activity under visible light[J]. Applied Surface Science, 2018,462:18-28.