Immobilization of cadmium in river sediments using sulfidized nanoscale zero-valent iron synthesized with different iron precursors: performance and mechanism

Xue, Wenjing; Wen, Siqi; Zhu, Yan; Gao, Yang; Wang, Rongzhong; Xu, Yang

doi:10.1007/s11368-023-03606-8

Cited by 1 publication

(1 citation statement)

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“…There was no difference between the concentration of Cd extracted in S-nZVI treated samples after 1 and 3 months, but an increase occurred after 6 months (13.7 ± 3.0 mg kg −1 ). This is contrary to the findings of Chen et al 39 and Xue et al 40 , where the concentration of TCLP-extracted Cd after stabilization with a nZVI/activated carbon composite and S-nZVI, respectively, caused a decrease in the concentration of Cd extracted by TCLP. Metal speciation before and after the addition of these amendments could help to understand the mechanism of Cd stabilization, as their addition caused a decrease of exchangeable and carbonated fraction and transformation to the residual fraction in both studies.…”

Section: Resultscontrasting

confidence: 99%

Evaluating the effectiveness of sulfidated nano zerovalent iron and sludge co-application for reducing metal mobility in contaminated soil

Ojo,

Vaňková,

Beesley

et al. 2024

Sci Rep

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Sewage sludge has long been applied to soils as a fertilizer yet may be enriched with leachable metal(loid)s and other pollutants. Sulfidated nanoscale zerovalent iron (S-nZVI) has proven effective at metal sorption; however, risks associated with the use of engineered nanoparticles cannot be neglected. This study investigated the effects of the co-application of composted sewage sludge with S-nZVI for the stabilization of Cd, Pb, Fe, Zn. Five treatments (control, Fe grit, composted sludge, S-nZVI, composted sludge and S-nZVI), two leaching fluids; synthetic precipitation leaching procedure (SPLP) and toxicity characteristic leaching procedure (TCLP) fluid were used, samples were incubated at different time intervals of 1 week, 1, 3, and 6 months. Fe grit proved most efficient in reducing the concentration of extractable metals in the batch experiment; the mixture of composted sludge and S-nZVI was the most effective in reducing the leachability of metals in the column systems, while S-nZVI was the most efficient for reducing about 80% of Zn concentration in soil solution. Thus, the combination of two amendments, S-nZVI incorporated with composted sewage sludge and Fe grit proved most effective at reducing metal leaching and possibly lowering the associated risks. Future work should investigate the longer-term efficiency of this combination.

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Section: Resultscontrasting

confidence: 99%