|Table of Contents|

[1] Xu Yiqiao, Wu Lei, Zheng Tianyi, Nitrate reduction by·CO-2 from UV-activated HCOOH [J]. Journal of Southeast University (English Edition), 2022, 38 (1): 77-84. [doi:10.3969/j.issn.1003-7985.2022.01.012]
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Nitrate reduction by·CO-2 from UV-activated HCOOH()
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
38
Issue:
2022 1
Page:
77-84
Research Field:
Environmental Science and Engineering
Publishing date:
2022-03-20

Info

Title:
Nitrate reduction by·CO-2 from UV-activated HCOOH
Author(s):
Xu Yiqiao1;  Wu Lei1;  Zheng Tianyi1;  2
1School of Energy and Environment, Southeast University, Nanjing 210096, China
2Jiangsu Branch of China Municipal Engineering Northwest Design and Research Institute Co., Ltd., Nanjing 210017, China
Keywords:
nitrate reduction;  advanced reduction process;  ultraviolet;  HCOOH;  ·CO-2
PACS:
X52
DOI:
10.3969/j.issn.1003-7985.2022.01.012
Abstract:
To address the environmental and health hazards of nitrate(NO-3)in water, a denitrification advanced reduction process(ARP)using only formic acid(HCOOH)activated by ultraviolet(UV)light was proposed. The efficiency, influencing factors, mechanism, and kinetics of the reduction were investigated through component analysis and radical detection. Results show that, after 90 min of UV illumination, the reduction and gas conversion ratios of 50 mg/L NO-3-N reach 99.9% and 99.8%, respectively, under 9 mM of C0(HCOOH), pH = 3.0, and N2 aeration. Meanwhile, 96.7% of HCOOH is consumed and converted into gas. The NO-3-N conversion process includes the transformation to NO-2-N, followed by a further reduction to gas and a direct conversion into gas, introducing small amounts of nitrite and ammonia. The carbon dioxide anion radical(·CO-2)from HCOOH/HCOO- is the principal cause of NO-3-N reduction by UV/HCOOH/N2 ARP. In contrast, ·CO-2 production is caused by the hydroxyl radical(·OH). The NO-3-N reduction efficiency is enhanced by the increase in the light intensity, considerably affected by the initial pH, and less affected by inorganic anions, including Cl-, H2PO-4, and HCO-3/CO2-3. The initial HCOOH concentration and light intensity are the main factors that influence the NO-3-N reduction rate.

References:

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Memo

Memo:
Biographies: Xu Yiqiao(1998—), female, graduate; Wu Lei(corresponding author), male, associate professor, wulei@seu.edu.cn.
Foundation item: The National Major Science and Technology Project(No.2017ZX07202-004-005).
Citation: Xu Yiqiao, Wu Lei, Zheng Tianyi.Nitrate reduction by ·CO-2 from UV-activated HCOOH[J].Journal of Southeast University(English Edition), 2022, 38(1):77-84.DOI:10.3969/j.issn.1003-7985.2022.01.012.
Last Update: 2022-03-20