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One of the problems is the existence of heavy metals (HMs) pollution, which can affect food, water sources and biodiversity. This experimental work studies the effect of multiwall carbon nanotubes (MWCNTs) and surfactants characteristics on HMs immobilization in a contaminated soil. The testing program comprises the characterization of the MWCNTs and surfactants, followed by two distinct adsorption tests: suspension tests designed to supply preliminary information regarding the adsorption capacity of soil particles towards the different HMs, and percolation tests to evaluate the HMs immobilization in conditions mimicking a real in-situ scenario. The different HMs exhibit different affinities order to the soil studied: Pb\u2009&gt;\u2009Cu\u2009&gt;\u2009Ni\u2009&gt;\u2009Zn. Results indicated that the inherent soil particles can immobilize significant quantities of HMs (especially Pb and Cu) due to their fine size and the existence of a substantial amount of organic matter content in the soil matrix. Molecular weight and charge density of the surfactant are characteristics with an impact on the MWCNTs dispersion and also on the adsorption capacity of the different HMs, namely in the case of Ni<jats:sup>2+<\/jats:sup> and even in the case of Zn<jats:sup>2+<\/jats:sup> possessing lower electronegativity and higher mobility. The findings of the study allow concluding that MWCNTs possess the potential to reduce the mobility of heavy metals in soil, even when employed at very low concentration (0.01% w\/w), which is an important feature considering their cost.<\/jats:p>","DOI":"10.1007\/s42452-024-05827-z","type":"journal-article","created":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T13:02:04Z","timestamp":1712581324000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Effect of multiwall carbon nanotubes and surfactants characteristics on immobilization of heavy metals in contaminated soils"],"prefix":"10.1007","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3260-8729","authenticated-orcid":false,"given":"Antonio A. 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