TY - JOUR
T1 - Simultaneous removal of lead(II) and nitrate from water at low voltage
AU - Rao, Xufeng
AU - Li, Qingyu
AU - Inoue, Chihiro
AU - Ahmad, Irshad
AU - Yi, Jin
AU - Liu, Yuyu
AU - Zhang, Jiujun
N1 - Funding Information:
This work was financially supported by “Pilot Project of High-level Local Colleges and Universities: Start-up Fee for Scientific Research of High-Level Talent Introduction”. The authors also gratefully acknowledge the financial supports from “ Scientific Research and Technology Development Plan of Guangxi ( GUIKE AD17195084 )”, and “ Overseas Visiting Scholar Program under International Partnership Enhancement Plan, Shanghai University ”.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12
Y1 - 2019/12
N2 - Simultaneous removal of lead(II) and nitrate from water were investigated by using aluminum and iron electrodes at low voltage. The results showed that the pollutant removal not only increases with increasing voltage and decreasing electrode distance but also is inhibited by solution acidity. The overall removal is considered to include three synchronous processes, i.e. chemical reduction (CR), electrochemical reduction (ECR) and electrocoagulation (EC). At pH of 4–10 with electrode distant of 2 cm under 6 V, the ECR played great role on nitrate removal whereas both CR and EC hardly worked. However, it can be found that, in solution at pH 4–6, CR and ECR are main processes in lead(II) removal with no EC happening; at pH of 6–10, CR and ECR contributed more than EC. Therefore, we conclude that efficient lead(II) removal is mainly achieved CR and ECR rather than EC at pH of 4–10, whereas nitrate removal is by ECR. The optimal removals of lead(II) (99.7%) and nitrate (57.6%) were achieved at pH 6 with low applied voltage of 6 V and electrode distance of 2 cm. Finally, it was confirmed by the experiment using KNO3 instead of Pb(NO3)2 that the presence of lead(II) ions can significantly inhibit nitrate removal.
AB - Simultaneous removal of lead(II) and nitrate from water were investigated by using aluminum and iron electrodes at low voltage. The results showed that the pollutant removal not only increases with increasing voltage and decreasing electrode distance but also is inhibited by solution acidity. The overall removal is considered to include three synchronous processes, i.e. chemical reduction (CR), electrochemical reduction (ECR) and electrocoagulation (EC). At pH of 4–10 with electrode distant of 2 cm under 6 V, the ECR played great role on nitrate removal whereas both CR and EC hardly worked. However, it can be found that, in solution at pH 4–6, CR and ECR are main processes in lead(II) removal with no EC happening; at pH of 6–10, CR and ECR contributed more than EC. Therefore, we conclude that efficient lead(II) removal is mainly achieved CR and ECR rather than EC at pH of 4–10, whereas nitrate removal is by ECR. The optimal removals of lead(II) (99.7%) and nitrate (57.6%) were achieved at pH 6 with low applied voltage of 6 V and electrode distance of 2 cm. Finally, it was confirmed by the experiment using KNO3 instead of Pb(NO3)2 that the presence of lead(II) ions can significantly inhibit nitrate removal.
KW - Chemical reduction
KW - Electrochemical reduction
KW - Electrocoagulation
KW - Lead(II)
KW - Nitrate
KW - Simultaneous removal
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U2 - 10.1016/j.jwpe.2019.100940
DO - 10.1016/j.jwpe.2019.100940
M3 - Article
AN - SCOPUS:85071839210
SN - 2214-7144
VL - 32
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 100940
ER -