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

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摘要通过在g-C₃N₄/生物炭(BC)材料表面还原沉积纳米零价铁(nZVI)制备了g-C₃N₄/BC/nZVI复合催化剂.利用SEM、TEM、XPS、XRD、UV-Vis DRS、光电流等对所制备的催化剂进行了物化性质和光电性能的表征,考察了g-C₃N₄/BC/nZVI在可见光照下对水中硝酸盐(NO₃^-)的还原性能.结果表明,中性水体的最佳反应条件为g-C₃N₄/BC与nZVI的质量比为1: 0.6, g-C₃N₄/BC/nZVI的投加量为2g/L,NO₃^-的初始浓度为20mg/L.与nZVI, BC/nZVI, g-C₃N₄/nZVI相比,g-C₃N₄/BC/nZVI表现出最快的NO₃^-还原速率(k=10.6×10^-2min^-1)以及较高的脱氮性能(71.6%).实验进一步考察了g-C₃N₄/BC/nZVI还原NO₃^-过程中氮的变化规律.推测还原机理为:可见光照下,光生电子通过BC转移到nZVI表面,提高了nZVI的反应活性和稳定性,同时, BC材料抑制光生空穴对nZVI的氧化作用; nZVI表面的活性电子将NO₃^-还原为N₂和NH₄⁺,而光生空穴则进一步将部分NH₄⁺氧化为N₂和其他气态产物.

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	李厚芬
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	周爱娟
	岳秀萍

关键词 ：光催化, g-C₃N₄, 生物炭, 纳米零价铁, NO₃^-还原

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

收稿日期: 2023-07-25

PACS:

X703.5

基金资助:山西省应用基础研究计划项目(202303021211030);山西浙大新材料与化工研究院研发项目(2022SXTD006)

作者简介: 李厚芬(1985-),女,山西太原人,副教授,博士,主要从事水体污染控制方面的研究.发表论文10余篇.lihoufen@tyut.edu.cn.

引用本文:

李厚芬, 魏谦, 郭阳, 刘鹏霄, 李瑞, 周爱娟, 岳秀萍. g-C₃N₄/生物炭/nZVI还原水中硝酸盐的性能[J]. 中国环境科学, 2024, 44(3): 1357-1365. LI Hou-fen, WEI Qian, GUO Yang, LIU Peng-xiao, LI Rui, ZHOU Ai-juan, YUE Xiu-ping. The performance of g-C₃N₄/biochar/nZVI in reducing nitrate in water. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1357-1365.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I3/1357

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