Format

Send to

Choose Destination
J Hazard Mater. 2019 Jul 5;373:678-686. doi: 10.1016/j.jhazmat.2019.03.126. Epub 2019 Mar 31.

Organo-layered double hydroxides for the removal of polycyclic aromatic hydrocarbons from soil washing effluents containing high concentrations of surfactants.

Author information

1
Department of Environmental Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China.
2
School of Environment, Tsinghua University, Beijing, 100084, China.
3
Department of Animal and Plant Sciences, The University of Sheffield, Sheffield, S10 2TN, UK; Future Industries Institute, University of South Australia, Mawson Lakes, SA 5095, Australia.
4
Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI), Division of Environmental Science and Ecological Engineering, Korea University, Seoul02841, Republic of Korea. Electronic address: yongsikok@korea.ac.kr.

Abstract

Disposal of soil washing effluent (SWE) resulting from the surfactant-enhanced remediation of soil containing hydrophobic organic contaminants (HOCs)is complicated because of the presence of high levels of surfactants. The synthesized layered double hydroxides (LDHs), modified with sodium dodecyl sulfonate (SDS) in different loading amounts (organo-LDHs),were evaluated in this study as sorbents for the removal of two typical HOCs, phenanthrene (PHE) and pyrene (PYR),from a simulative SWE. The results showed that the organo-LDHs can effectively sorb PHE and PYR from the SWE within an equilibrium time of 2 h. All isotherms were linear and the sorption capabilities of the organo-LDHs increased almost linearly with the increase in the amount of SDS loaded on the LDHs. Besides, the surface areas of the organo-LDHs decreased sharply with the increase in SDS loading owing to the hindrance of the exposed surface of the LDHs by the incorporated SDS. These findings indicated that partitioning dominated the sorption process rather than adsorption, and the strong affinity of HOCs towards the organic phase in LDHs assisted in the effective removal of polycyclic aromatic hydrocarbons (PAHs) from the SWE. Furthermore, the sorption capabilities of organo-LDHs towards PHE and PYR at the higher loading amounts of SDS were much greater than that of commercial activated carbon at the higher concentration ranges of PAHs.

KEYWORDS:

Organic layered double hydroxides; Polycyclic aromatic hydrocarbon; Soil remediation; Soil washing effluent

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center