Journal of Inorganic Materials, Volume. 36, Issue 3, 292(2021)
Phosphorus is an essential nutrient for organisms growth and a major cause of eutrophication in water bodies. Thus, it is crucial for both of the removal and recovery of phosphate from wastewater. In this work, the NiCo-layered double oxide (NiCo-LDO) was successfully fabricated on carbon cloth conductive substrate via the in-situ calcination of the NiCo-layered double hydroxide (NiCo-LDH) and served as the electrochemically switched ion exchange (ESIX) film electrode for the removal and recovery of PO43-. The performance of NiCo-LDO for PO43- removal by ESIX and ion exchange (IX) was compared, while the selectivity and stability of NiCo-LDO for PO43- removal were also investigated. The results revealed that, in (10.00±0.05) mg/L PO43- solution, the ion exchange quantity of the NiCo-LDO for PO43- removal by ESIX process was about twice over that by IX. Moreover, compared with Cl -, NO3-, SO42- and I -, the NiCo-LDO exhibited much higher selectivity towards PO43-. In addition, the ion exchange quantity still retained 92% of its initial value after 5 uptake and release cycles. Coupled with XPS analysis, it was found that ESIX process of NiCo-LDO film electrode for PO43- removal and recovery mainly consisted of 3 steps, which were an irreversible “memory effect” structure recovery process, the redox reaction of metal ion in lamellar and the ligand exchange between PO43- and O-H groups.
Get Citation
Copy Citation Text
Yanyan YANG, Yongguo LI, Xiaowen ZHU, Xiao DU, Xuli MA, Xiaogang HAO.
Category: RESEARCH PAPER
Received: Jun. 20, 2020
Accepted: --
Published Online: Dec. 8, 2021
The Author Email: HAO Xiaogang (tyutxghao@hotmail.com)