g-C<sub>3</sub>N<sub>4</sub>/生物炭/nZVI还原水中硝酸盐的性能

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1319 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract A g-C₃N₄/biochar (BC)/nanoscale zero-valent iron (nZVI) composite catalyst with deposited nZVI on the surface of g-C₃N₄/BC material was prepared. The physical and chemical properties, as well as the photoelectric performance of the prepared catalyst, were characterized using SEM, TEM, XPS, XRD, UV-Vis DRS, photocurrent test, etc. The nitrate (NO₃^-) reduction performance of g-C₃N₄/BC/nZVI under visible light irradiation was investigated. The results showed that the optimal reaction conditions in neutral water were a mass ratio of g-C₃N₄/BC to nZVI of 1:0.6, an addition amount of g-C₃N₄/BC/nZVI of 2g/L and the initial NO₃^- concentration of 20mg/L. Compared with nZVI, BC/nZVI and g-C₃N₄/nZVI, g-C₃N₄/BC/nZVI exhibited the fastest NO₃^- reduction rate (k=10.6×10^-2min^-1) and higher denitrification efficiency (71.6%). The study further investigated the variation of nitrogen during the NO₃^- reduction by g-C₃N₄/BC/nZVI. The reduction mechanism is proposed that: Under visible light irradiation, photogenerated electrons transferred via BC to the surface of nZVI, which enhanced the reactivity and stability of nZVI, while BC material inhibited the oxidation of nZVI by photogenerated holes. The active electrons on the surface of nZVI reduced NO₃^- to N₂ and NH₄⁺, while the photogenerated holes further oxidized some NH₄⁺ to N₂ and other gaseous products.

Key words： photocatalysis g-C₃N₄ biochar nZVI NO₃^- reduction

Received: 25 July 2023

PACS:

X703.5

Corresponding Authors: 李厚芬,副教授,lihoufen@tyut.edu.cn E-mail: lihoufen@tyut.edu.cn

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LI Hou-fen
	WEI Qian
	GUO Yang
	LIU Peng-xiao
	LI Rui
	ZHOU Ai-juan
	YUE Xiu-ping

Cite this article:

LI Hou-fen,WEI Qian,GUO Yang等. The performance of g-C₃N₄/biochar/nZVI in reducing nitrate in water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1357-1365.

URL:

http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I3/1357

[1] 凌郡鸿,张依章,曹英杰,等.基于氮氧同位素的南四湖硝酸盐来源解析[J]. 中国环境科学, 2023,43(6):3100-3106. Ling J H, Zhang Y Z, Cao Y J, et al. An analysis of nitrate sources in Nansi Lake based on nitrogen and oxygen isotopes[J]. China Environmental Science, 2023,43(6):3100-3106.
[2] Gutierrez J E, Gutierrez-Hoyos N, Gutierrez J S, et al. Bioremediation of a sewage-contaminated tropical swamp through bioaugmentation with a microalgae-predominant microbial consortium[J]. Indian Journal of Microbiology, 2022,62(2):307-311.
[3] Li Z J, Yang Q C, Xie C, et al. Source identification and health risks of nitrate contamination in shallow groundwater:A case study in Subei Lake basin[J]. Environmental Science and Pollution Research, 2023, 30(5):13660-13670.
[4] Gong X, Liu Y, Wang B, et al. Nitrate reduction via micro-electrolysis on Zn-Ag bimetal combined with photo-assistance[J]. Science of The Total Environment, 2019,683:89-97.
[5] Liu Y, Wang J. Reduction of nitrate by zero valent iron (ZVI)-based materials:A review[J]. Science of The Total Environment, 2019,671:388-403.
[6] 王畅,刘吉明,王永恒,等.改性Cu-Pd双金属复合电极电化学还原硝酸盐废水性能研究[J]. 中国环境科学, 2023,43(10):5196-5207. Wang C, Liu J M, Wang Y H, et al. Study on electrochemical reduction of nitrate wastewater by modified Cu-Pd bimetallic composite electrode[J]. China Environmental Science, 2023,43(10):5196-5207.
[7] 郭峰,谢陈鑫,韩恩山,等.Cu₂O/CF电极的制备及其电还原硝酸盐的研究[J/OL]. 中国环境科学:1-15[2023-09-01]. https://doi.org/10.19674/j.cnki.issn1000-6923.20230612.006. Guo F, Xie C X, Han E S, et al. Preparation of Cu₂O/CF electrode and its study of electro-reduction of nitrate[J/OL]. China Environmental Science:1-15[2023-09-01].https://doi.org/10.19674/j.cnki.issn1000-6923.20230612.006.
[8] Li H F, Xue S, Cao F, et al. Enhanced nitrate reduction by metal deposited g-C₃N₄/rGO/TiO₂ Z-schematic photocatalysts:Performance and mechanism comparison of Pd-Cu and Ag[J]. Chemosphere, 2023,325:138336.
[9] Jiang C S, An H Z, Dong G J, et al. Hexagonal boron nitride with functional groups for efficient photocatalytic reduction of nitrate without additional hole scavengers[J]. Chemical Engineering Journal, 2022,428:131054.
[10] 韩可心,张琼,冯岩,等.三级厌氧氨氧化处理生活污水与硝酸盐废水[J]. 中国环境科学, 2022,42(2):637-643. Han K X, Zhang Q, Feng Y, et al. Simultaneous removal of domestic wastewater and nitrate wastewater by three-stage anammox system[J]. China Environmental Science, 2022,42(2):637-643.
[11] 周佳敏,黄廷林,刘茜,等.低C/N亚铁氧化硝酸盐还原菌群脱氮特性[J]. 中国环境科学, 2021,41(8):3723-3732. Zhou J M, Huang T L, Liu Q, et al. Denitrifying characteristics of low C/N ferrous oxidation nitrate reducing bacteria flora[J]. China Environmental Science, 2021,41(8):3723-3732.
[12] Izadi N, Ali B H, Shahin M S, et al. The removal of Cr(VI) from aqueous and saturated porous media by nanoscale zero-valent iron stabilized with flaxseed gum extract:Synthesis by continuous flow injection method[J]. Korean Journal of Chemical Engineering, 2022, 39(8):2217-2228.
[13] Moridi A, Sabbaghi S, Rasouli J, et al. Removal of cefixime from wastewater using a superb nZVI/copper slag nanocomposite:Optimization and characterization[J]. Water, 2023,15(10):1819.
[14] Li S S, Yang F, Zhang Y Y, et al. Performance of lead ion removal by the three-dimensional carbon foam supported nanoscale zero-valent iron composite[J]. Journal of Cleaner Production, 2021,294:125350.
[15] Qian X W, Huang J, Yan C N, et al. Stimulation on microbial nitrogen metabolism by iron under PFAS exposure drives effective nitrogen removal in constructed wetland[J]. Journal of Water Process Engineering, 2023,53:103879.
[16] Wang W B, Dong Q L, Qiu H, et al. Rapid reactivation of aged nZVI/GO by Shewanella CN32 for efficient removal of tetrabromobisphenol A and associated reaction mechanisms[J]. Journal of Cleaner Production, 2022,333:130215.
[17] Xing R, He J J, Hao P L, et al. Graphene oxide-supported nanoscale zero-valent iron composites for the removal of atrazine from aqueous solution[J]. Colloids and Surfaces A-Physicochemical and Engineering Aspects, 2020,589:124466.
[18] Xue C J, Wu J, Wang K, et al. Effects of different types of biochar on the properties and reactivity of nano zero-valent iron in soil remediation[J]. Frontiers of Environmental Science & Engineering, 2021,15(5):101.
[19] Wei A L, Ma J, Chen J J, et al. Enhanced nitrate removal and high selectivity towards dinitrogen for groundwater remediation using biochar-supported nano zero-valent iron[J]. Chemical Engineering Journal, 2018,353:595-605.
[20] Zhang J, Zhang T, Liang X, et al. Efficient photocatalysis of Cr-VI and methylene blue by dispersive palygorskite-loaded zero-valent iron/carbon nitride[J]. Applied Clay Science, 2020,198:105817.
[21] Diao Z H, Jin J C, Zou M Y, et al. Simultaneous degradation of amoxicillin and norfloxacin by TiO₂@nZVI composites coupling with persulfate:Synergistic effect, products and mechanism[J]. Separation and Purification Technology, 2021,278:119620.
[22] Li X Y, Ye F, Zhang H, et al. Ternary rGO decorated W₁₈O₄₉@g-C₃N₄ composite as a full-spectrum-responded Z-scheme photocatalyst for efficient photocatalytic H₂O₂ production and water disinfection[J]. Journal of Environmental Chemical Engineering, 2023,11:110329.
[23] Wei Q, Li H F, Guo Y, et al. Performance and mechanism study of g-C₃N₄/rGO heterojunction enhanced NO₃⁻ reduction by nZVI under visible light irradiation[J]. Journal of Alloys and Compounds, 2023, 946:169309.
[24] Ismael M, Wu Y, Taffa D H, et al. Graphitic carbon nitride synthesized by simple pyrolysis:Role of precursor in photocatalytic hydrogen production[J]. New Journal of Chemistry, 2019,43(18):6909-6920.
[25] Aritonang H F, Wulandari R, Wuntu A D. Synthesis and characterization of bacterial cellulose/nano-graphite nanocomposite membranes[C]. International Conference on Innovation in Polymer Science and Technology (IPST) in conjunction with 7th International Conference on Fuel Cell and Hydrogen Technology (ICFCHT), 2019.
[26] Samsudin M F R, Bacho N, Sufian S, et al. Photocatalytic degradation of phenol wastewater over Z-scheme g-C₃N₄/CNT/BiVO₄ heterostructure photocatalyst under solar light irradiation[J]. Journal of Molecular Liquids, 2019,277:977-988.
[27] Li R B, Huang J S, Cai M X, et al. Activation of peroxymonosulfate by Fe doped g-C₃N₄/graphene under visible light irradiation for trimethoprim degradation[J]. Journal of Hazardous Materials, 2020, 384:121435.
[28] 钟来元,廖荣骏,刘付宇杰,等.KOH改性花生壳生物炭对盐酸四环素的吸附性能及其机理[J/OL]. 农业环境科学学报:1-15[2023- 07-25]. http://kns.cnki.net/kcms/detail/12.1347.S.20230630.1331.002.html. Zhong L, Liao R, Liu F, et al. Adsorption of tetracycline hydrochloride by KOH modified peanut shell biochar and its mechanism[J/OL]. Journal of Agro-Environment Science, 1-15[2023-07-25]. http://kns.cnki.net/kcms/detail/12.1347.S.20230630.1331.002.html.
[29] Shanavas S, Roopan S M, Priyadharsan A, et al. Computationally guided synthesis of (2D/3D/2D) rGO/Fe₂O₃/g-C₃N₄ nanostructure with improved charge separation and transportation efficiency for degradation of pharmaceutical molecules[J]. Applied Catalysis B-Environmental, 2019,255:117758.
[30] Zheng H, Bao J G, Huang Y, et al. Efficient degradation of atrazine with porous sulfurized Fe₂O₃ as catalyst for peroxymonosulfate activation[J]. Applied Catalysis B-Environmental, 2019,259:118056.