For water treatment/remediation by zerovalent iron (ZVI), of particular concern is its selectivity toward contaminants over natural non-targets (e.g., O₂ and H₂O/H⁺). Hence, the effects of weak magnetic field (WMF) on the selectivity of ZVI toward metalloid oxyanions (i.e., As(III), As(V), Sb(III), Sb(V), Se(IV) and Se(VI)) were in-depth investigated under aerobic conditions. This study unraveled that, despite the electron utilization (EU) of ZVI with and without WMF were almost identical at reaction equilibrium, the application of a WMF could enhance the specific removal capacity (SRC) of ZVI toward metalloid oxyanions from 1.8-19.0 mg/g Fe to 12.6-85.3 mg/g Fe. Particularly, the electron efficiency (EE) of ZVI with WMF for reduction of Se(IV)/Se(VI) were 3.7- to 14.1-fold greater than that without WMF. Since the WMF-induced magnetic gradient force ($F_{\Delta B}$) can derive the movement of both Fe²⁺ and metalloid oxyanions, the subsequent incorporation of metalloid oxyanions with in-situ generated iron oxides can also been mediated synchronously and thus leading to an enhanced SRC of ZVI (also EE for Se(IV) and Se(VI) reduction by ZVI). In general, our findings prove that WMF should be a promising method to promote the selectivity of ZVI for water decontamination under aerobic conditions.

对于零价铁（ZVI）进行水处理/修复，尤其要注意的是它对污染物的选择性要高于天然非目标物质（例如O ₂和H ₂ O / H ⁺）。因此，弱磁场（WMF）对ZVI对类金属氧阴离子（即As（III），As（V），Sb（III），Sb（V），Se（IV）和Se（VI）的选择性的影响））在有氧条件下进行了深入研究。这项研究揭示了，尽管有和没有WMF的ZVI在反应平衡时的电子利用率（EU）几乎相同，但使用WMF可以将ZVI对类金属氧阴离子的比去除容量（SRC）从1.8-19.0 mg / g铁至12.6-85.3 mg / g铁。特别地，具有WMF的ZVI用于还原Se（IV）/ Se（VI）的电子效率（EE）比没有WMF的电子效率高3.7-14.1倍。由于WMF引起的磁梯度力（$F_{\Delta 乙}$）可以推导Fe ²⁺和准金属氧阴离子的运动，随后可以同时介导准金属氧阴离子与原位生成的氧化铁的结合，从而导致ZVI的SRC增强（Se（IV）的EE和通过ZVI还原Se（VI））。总的来说，我们的发现证明WMF应该是一种在有氧条件下提高ZVI对水净化的选择性的有前途的方法。