Magnetically-mediated regeneration and reuse of core-shell Fe0@FeIII granules for in-situ hydrogen sulfide control in the river sediments

Effects of three iron material treatments on hydrogen sulfide release from anoxic sediments

“…In contrast, 3C-1, 3C-2, and 3C-3 (FeOOH) showed almost no increase during the first 2 d. This reflected the complete suppression of H 2 S release and stood in sharp contrast to the performance of Fe 2 O 3 , while being qualitatively consistent with Experiment 1. This suggests that the chemical form of the iron material used is a particularly important factor that influences its reactivity with H 2 S. This finding is consistent with that of Sun et al (2019) and indicates that FeOOH exhibits a larger specific surface area and higher reactivity to sulfide than Fe 2 O 3 .…”

“…For example, Yin et al (2018) applied iron granules to mitigate sedimentary H 2 S release. Meanwhile, Sun et al (2019) reported that iron granules could be reused four times during a 293-d trial and their overall sulfide removal capacity was at least 920 mg S/g Fe. However, the granules require regeneration by separating them from the sediment as well as reoxidation, both of which are costly and time-consuming.…”

Development of cost-effective and long-lasting integrated technology for H2S control from sludge in wastewater treatment plants

“…Fe 2 O 3 removes the H 2 S in the liquid sludge via a sequence of reactions. [26][27][28] H 2 S is first oxidized by ferric iron into S 0 with the concurrent formation of ferrous iron associated with the Fe 2 O 3 surface (≡Fe II O) (eqn (12)). ≡Fe II O hydrolyzes into ferrous ions (Fe 2+ ) and reacts with H 2 S to form iron sulfide precipitates (FeS) (eqn ( 13) and ( 14)).…”

Joule Heating Induced Reductive Iron–Magnesium Bimetallic Nanocomposite for Eminent Heavy Metal Removal

“…3−5 Notwithstanding these merits, their efficiency in heavy metal removal remains unsatisfactory due to passivation and aggregation issues encountered in practical applications. 6,7 To address this limitation, an effective strategy involves incorporating a secondary metal to form Fe-based bimetallic nanoparticles, thereby enhancing their pollutant removal activity via the formed galvanic effect or hydrogen atom generation. 8−10 However, most metals with positive redox potential or catalytic properties, such as Pd, Pt, Ag, Cu, Ni, and Pb, are often limited by cost or toxicity.…”

“…The unregulated discharge of heavy metal-containing wastewater (such as Cr­(VI), Sb­(V), Ni­(II), and Cu­(II)) from mining, printing and dyeing, and other human activities, poses a severe threat to the self-operation of the ecosystem. , Fe 0 -based materials are recognized as excellent electron donors and reductants for environmental remediation due to their strong reactivity. − Notwithstanding these merits, their efficiency in heavy metal removal remains unsatisfactory due to passivation and aggregation issues encountered in practical applications. , To address this limitation, an effective strategy involves incorporating a secondary metal to form Fe-based bimetallic nanoparticles, thereby enhancing their pollutant removal activity via the formed galvanic effect or hydrogen atom generation. − However, most metals with positive redox potential or catalytic properties, such as Pd, Pt, Ag, Cu, Ni, and Pb, are often limited by cost or toxicity. − Therefore, it is imperative to select cost-effective and environmentally friendly metals for bimetallic modification.…”