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
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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纳米级零价铁负载沉积物基生物炭（nZVI-SBC）同时去除硝酸盐和磷酸盐的可行性：对二氮的高选择性和协同机制
DOI：
10.1007/s11356-021-13322-w
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发表时间：
2021-02
影响因子：
5.8
通讯作者：
Li Jun
中科院分区：
文献类型：
--
作者：
Liu Xiaohui;Wei Jia;Hou Liangang;Zhu Yuhan;Wu Yaodong;Xing Luyi;Zhang Yifei;Li Jun
在水处理过程中，氮、磷污染物超标备受关注。因此，我们制备了纳米零价铁负载沉积物基生物炭（nZVI-SBC），同时进行硝酸盐和磷酸盐的去除。表征结果表明，成功合成了nZVI-SBC，与纯nZVI相比，nZVI-SBC具有比表面积大、分散性好等优点。批实验表明，nZVI与SBC的最佳负载比为1：1，硝酸盐和磷酸盐的最佳投加量分别为2 g L-1。通过nZVI-SBC去除它们是酸驱动的过程。缺氧环境更有利于硝酸盐的还原，而磷酸盐的去除则倾向于缺氧环境。硝酸盐和磷酸盐的去除率分别为77.78%和99.21%，主要取决于还原和络合机理。此外，nZVI-SBC比nZVI具有更高的N2选择性和更少的铵生成量。研究了硝酸盐和磷酸盐之间的相互作用，表明它们在去除另一个过程中有不同程度的抑制作用。本研究表明nZVI-SBC在氮磷污染水体的修复方面具有很大的潜力。
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 N2selectivity 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
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