A mechanistic analysis of the influence of iron‐oxidizing bacteria on antimony (V) removal from water by microscale zero‐valent iron

Abstract

BACKGROUND Microscale zero‐valent iron (mZVI) is an efficient material for removing heavy metals from water, and iron‐oxidizing bacteria are the primary microorganisms responsible for iron corrosion. We investigated the effects of Sphaerotilus natans on antimony [Sb(V)] removal by mZVI using batch experiments. RESULTS At an initial Fe0 dose of 0.1 g L–1, 40 mg L–1 Sb(V) was almost completely removed in an abiotic system. Although S. natans exhibited significant tolerance to Sb(V), its ability to adsorb Sb(V) was poor. Most importantly, the presence of S. natans reduced the removal rate of aqueous Sb(V) by mZVI by up to 39%. The value of the redox potential in the biologically mediated system was lower than that in the abiotic control, indicating oxygen consumption by S. natans. In the presence of S. natans, the main reaction products were FeOOH and FeSb2O6, compared to Fe2O3 in the abiotic system. Biomineralization of Fe3+ ions by S. natans may have occurred during the experiment, but it did not play a significant role in Sb(V) removal. CONCLUSION mZVI can be efficiently used to remove Sb(V) from water. However, the presence of S. natans may inhibit its removal ability, likely due to the decreased mass transfer and lower corrosion of iron. © 2018 Society of Chemical Industry

Study on Solidification and Stabilization of Antimony-Containing Tailings with Metallurgical Slag-Based Binders

“…Based on the leaching results, it could be confirmed that MBT had the better curing performance of Sb. The higher UCS of MBT was attributed to the formation of more hydration products, which yielded a denser structure and thus reduced the release of Sb from tailings [ 24 ].…”

Effective adsorption of perrhenate ions on the filamentous sheath-forming bacteria, Sphaerotilus montanus, Sphaerotilus natans and Thiothrix fructosivorans

“…The Fourier‐transform infrared spectra of S. montanus , S. natans and T. fructosivorans are shown in Figure 1. In the spectra, the broad bands around 3422 and 3302 cm −1 are assigned to the stretching modes of N‐H of amides and ‐OH bonds, (Li, Wu, et al, 2018; Li, Zhu, et al, 2018; Loukidou et al, 2003; Pagnanelli et al, 2004). The broad band around 3068 cm −1 is assigned to the =C‐H stretching vibration (Busca et al, 1992).…”

“…It is an oxyanion and the nature of adsorption sites is completely different from those found in cation adsorptions. Although high capacities have often been obtained when using anion exchange resins (Chen et al, 2019; Lee et al, 2005; Li, Wu, et al, 2018; Li, Zhu, et al, 2018; Nebeker & Hiskey, 2012) and other synthetic adsorbents, (Drout et al, 2018; Han et al, 2018; Li et al, 2020; Rajec et al, 2015) it is difficult to reduce the cost of preparation of these materials, compared with chars or minerals. (Hu et al, 2015; Huang & Hu, 2020; Mulcahy et al, 1990; Wakoff & Nagy, 2004).…”

A Critical Review of Resistance and Oxidation Mechanisms of Sb-Oxidizing Bacteria for the Bioremediation of Sb(III) Pollution

“…However, to our knowledge, the oxidation behavior and mechanism of Sb(III) under coupling-mediated iron/manganese (hydr)oxides between microbes has not yet been described in literature. Therefore, the oxidation behavior of Sb-oxidizing bacteria induced by iron and manganese oxide is also a future research priority ( Nguyen et al, 2017a , b ; Li Y. et al, 2018 ).…”