Iron-Based Adsorbents Derived from Groundwater Deferrization Sludge for Spent Oil Removal from Aqueous Media
Valentin Romanovski, Alesia Harelaya, Haitao Wang, Dmitry Moskovskikh
TL;DR
This paper explores using iron oxide nanoparticles made from groundwater sludge to effectively remove oil from water, with promising results and machine learning models for optimization.
Contribution
The study introduces a novel method for synthesizing iron-based adsorbents from sludge and demonstrates their high oil sorption capacity and stability.
Findings
Iron oxide sorbents with up to 99% magnetite content were synthesized using citric acid and urea at specific temperatures.
The oil sorption capacity reached 6.1 g/g, outperforming many existing sorbents.
Machine learning models accurately predicted sorption capacity with R² = 1.0.
Abstract
The paper presents the results of the synthesis and study of iron oxide-based sorbents (Fe x O y -NPs) obtained from iron removal station sludge by exothermic combustion in solution using glycine, urea, citric acid, and urotropine as reducing agents. X-ray phase analysis revealed that the phase composition depends on the nature of the reducing agent and temperature: at 300–500 °C, the magnetite content reached 97–99% for citric acid and urea, whereas when using glycine, the Fe3O4 fraction did not exceed 30%. The point of zero charge values shifted to the alkaline region with increasing synthesis temperature, reaching 8.8 at 700 °C. The specific surface area for methylene blue was up to 186 m2/g, but the calculated values exceeded the BET data by 3.5–4 times due to multilayer sorption on the functionalized surface, which is consistent with the FTIR spectra. The oil sorption capacity…
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Taxonomy
TopicsAdsorption and biosorption for pollutant removal · Iron oxide chemistry and applications · Environmental remediation with nanomaterials