Electrocatalytic nitrate reduction using Fe0/Fe3O4 nanoparticles immobilized on nickel foam: Selectivity and energy consumption studies

被引：113
作者：
Jonoush, Zohreh Akbari [1 ]
Rezaee, Abbas [1 ]
Ghaffarinejad, Ali [2 ]
机构：
[1] Tarbiat Modares Univ, Dept Environm Hlth, Fac Med Sci, Tehran, Iran
[2] Iran Univ Sci & Technol, Res Lab Real Samples Anal, Fac Chem, Tehran 1684613114, Iran
来源：
JOURNAL OF CLEANER PRODUCTION | 2020年 / 242卷
关键词：
Electrocatalytic; Denitrification; Fe3O4; nanoparticles; Zero-valent iron; Nickel foam; EFFICIENT ELECTROCHEMICAL REDUCTION; AQUEOUS-SOLUTION; PAIRED ELECTROLYSIS; CATALYTIC-REDUCTION; REMOVAL; WATER; ELECTRODES; NITROGEN; CATHODE; DENITRIFICATION;
D O I：
10.1016/j.jclepro.2019.118569
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The main objective of this study is to offer an effective electrocatalytic system with high selectivity to nitrogen and low energy consumption using Ni-Fe-0@Fe3O4 nanocomposite. The Ni-Fe-0@Fe3O4 nanocomposite electrode for electrocatalytic denitrification prepared via an electrodeposition method. Factors effective on nitrate electrocatalytic reduction such as current efficiency, nitrate removal, nitrite and ammonia generation, nitrogen selectivity, and energy consumption were studied using the Ni-Fe-0@Fe3O4 nanocomposite electrode. The Ni-Fe-0@Fe3O4 nanocomposite was characterized by BET, FE-SEM, EDX, and XRD techniques. The proposed electrocatalytic system reached 90.19% nitrate removal efficiency using 5 mA/cm(2) current density within 240 min, pH of 6.2, and 10mM NaCl compared to Ni foam (28.16%) and Ni-Fe-0 (45.95%). The electrocatalytic system exhibited a high selectivity to nitrogen, desirable current efficiency, and low energy consumption, of about 4.42 KWh/n-nitrate-N under the optimum condition. The results showed that the ammonium and nitrite generation decreased in the electrocatalytic process. (c) 2019 Elsevier Ltd. All rights reserved.
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页数：12
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