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Feasibility of nanoscale zerovalent iron-loaded sediment-based biochar (nZVI-SBC) for simultaneous removal of nitrate and phosphate: high selectivity toward dinitrogen and synergistic mechanism

In the process of water treatment, excessive nitrogen and phosphorus pollutants are of great concern. Therefore, we prepared nanoscale zerovalent iron loaded on sediment-based biochar (nZVI-SBC) to conduct nitrate and phosphate removal at the same time. The characterization demonstrated that nZVI-SB...

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Published in:Environmental science and pollution research international 2021-07, Vol.28 (28), p.37448-37458
Main Authors: Liu, Xiaohui, Wei, Jia, Hou, Liangang, Zhu, Yuhan, Wu, Yaodong, Xing, Luyi, Zhang, Yifei, Li, Jun
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description In the process of water treatment, excessive nitrogen and phosphorus pollutants are of great concern. Therefore, we prepared nanoscale zerovalent iron loaded on sediment-based biochar (nZVI-SBC) to conduct nitrate and phosphate removal at the same time. The characterization demonstrated that nZVI-SBC was successfully synthesized, which had obvious advantages for larger specific surface area and better dispersion compared with pure nZVI. The batch experiments indicated that the best loading ratio of nZVI to SBC and optimum dosage for nitrate and phosphate were 1:1and 2 g L −1 , respectively. Their removal by nZVI-SBC was an acid-driven process. Anoxic environment was more conducive to the reduction of nitrate while the phosphate removal was fond of oxygen environment. A total of 77.78% of nitrate and 99.21% of phosphate have been successfully removed, mainly depending on reduction and complexation mechanism, respectively. Moreover, nZVI-SBC had higher N 2 selectivity and produced less ammonium than nZVI. The interaction between nitrate and phosphate was studied to manifest that they had different degrees of inhibition during the removal of the other. Our research indicated that nZVI-SBC has great potential for remediation of nitrogen and phosphorus polluted water. Graphical abstract
doi_str_mv 10.1007/s11356-021-13322-w
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source ABI/INFORM Global; Springer Nature
subjects Ammonium
anaerobic conditions
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
biochar
Charcoal
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Iron
Nitrate removal
Nitrates
Nitrogen
Nitrogen removal
oxygen
Phosphate
Phosphates
Phosphorus
Phosphorus removal
Pollutants
Reduction
remediation
Research Article
Selectivity
surface area
Waste Water Technology
Water Management
Water pollution
Water Pollution Control
Water treatment
title Feasibility of nanoscale zerovalent iron-loaded sediment-based biochar (nZVI-SBC) for simultaneous removal of nitrate and phosphate: high selectivity toward dinitrogen and synergistic mechanism
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