201. Biosurfactant and iron oxide nanoparticle-assisted bioremediation of soil co-contaminated with hydrocarbons and hazardous heavy metals.
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Elumalai, Punniyakotti, Rajamohan, Rajaram, Thashbin Vayal Purayil, Aman, Menon, Vishakha, Pranav Srivatsan, Ramesh, Santhosh Kumar, Arunagiri, Lakshminarayanan, Sivakumar, Mainupriya, Sritharan, Nandi, Sreya, Gao, Xueke, Cui, Jinjie, and Parthipan, Punniyakotti
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IRON oxide nanoparticles , *INORGANIC compounds , *MUNG bean , *FERRIC oxide , *HEAVY oil , *IRON oxides - Abstract
[Display omitted] • An integrated approach for bioremediating contaminated soil was proposed. • Bacillus and Paenibacillus strains were used for biosurfactant production. • About 97 % of crude oil degradation was obtained within 15 days by both strains. • Iron oxide nanoparticles were green synthesized using Aerva lanata flower extract. • The approach effectively treated hydrocarbon and heavy metal co-contaminated soil. The innate resources of water and land are polluted by hydrocarbons, heavy metals, and other organic/inorganic compounds, and pollutants have become a significant concern because of their persistent and hydrophobic nature in the environment. In this study, two effective biosurfactant-producing indigenous bacterial strains, Bacillus subtilis strain R6 and Paenibacillus dendritiformis strain S2, were selected based on screening tests. First, we targeted the biodegradation of crude oil (C 9 –C 30 hydrocarbons) by the bacterial strains in a mineral salt medium under optimal conditions for 15 days. The results revealed that both strains obtained approximately 97 % degradation efficiency. Simultaneously, iron oxide nanoparticles with a size of 10 nm were green synthesized using Aerva lanata flower extract and confirmed with different spectroscopic and microscopic techniques. Furthermore, the bioremediation of soil co-contaminated with crude oil and heavy metals was performed using a mixed consortium of B. subtilis strain R6 and P. dendritiformis strain S2, iron oxide nanoparticles (1 and 2 g/kg), and a biosurfactant under optimal conditions. Toxicity assessments were performed by growing Vigna radiata in the bioremediated soil. Significant bioremediation efficiencies were observed in the biosurfactant and iron oxide nanoparticle-added systems, reaching a maximum efficiency of 99 % in system VII. This integrated approach can be used for the practical treatment of co-contaminated environments. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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