AI Article Synopsis
- The study examined how different substances (like low molecular weight organic acids, surfactants, and inorganic salts) affect the desorption of naphthalene from soil, finding that naphthalene release closely followed pseudo-second-order kinetics.
- Citric acid notably enhanced the generation of reactive oxygen species and naphthalene degradation when combined with a specific chemical oxidation system, while surfactants and calcium chloride hindered this process.
- The optimal conditions for maximum naphthalene removal (97.5% in 120 minutes) were determined, highlighting low molecular weight organic acids, particularly citric acid, as the most effective desorbents for soil remediation efforts.
Article Abstract
In this work, the effect of different desorbents (low molecular weight organic acids (LMWOAs), surfactants, and inorganic salts) on naphthalene (NAP) desorption in soil was investigated, and the results showed that NAP desorption pattern fitted the pseudo-second-order kinetics. The addition of LMWOAs, especially citric acid (CA), could stimulate the reactive oxygen species (ROS) generation and NAP degradation in Fe(II) activated persulfate (PS) system, while the presence of surfactants and CaCl could inhibit the NAP removal due to the competitive consumption of ROS. The maximum removal of NAP was 97.5% within 120 min at the PS/Fe(II)/CA/NAP molar ratio of 15/5/1/1, and the pseudo-first-order kinetic constant of NAP removal increased from 0.0110 min to 0.0783 min with the addition of CA. Compared with surfactants and inorganic salts, LMWOAs, especially CA, were more suitable as desorbent in soil washing coupled with in situ chemical oxidation technique. Moreover, 1.86 mg L desorbed amount and 36.1% removal of NAP from soil could be obtained with the presence of 1 mM CA. Finally, the significant removal of NAP and other contaminants (phenanthrene, fluoranthene, and benzene series) in actual groundwater could provide theoretical basis and technical support for the remediation of organic contaminated sites with desorbents.
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| http://dx.doi.org/10.1016/j.jhazmat.2022.128803 | DOI Listing |
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