Study of PCP Photodegradation by TiO₂ Catalyst Based on Different Properties of Soil Washing Effluents

Abstract:

Remediation of hydrophobic organic contaminants (HOCs) in soils and groundwater has becoming an issue of extensive concern around the world. Surfactant enhanced remediation has been suggested as a promising technology for abating such contaminants, and the nonionic surfactants have often been employed based on their high solubilization capabilities and comparatively low critical micelle concentrations (CMCs). A major problem arises after soil washing because the collected surfactant-containing wastes must be properly disposed or treated. In this study, 13 different soil with different basic properties were artificially contaminated with pentachlorophenol (PCP) and washed with TX100, a widely used nonionic surfactant. The properites of the as-required 13 washing effluents were test, and photocatalystic degradation of PCP using commercial P25 TiO₂ was carried out. The degradation curves were fitted to the pseudo-first-order kinetic law, and simple correlation coefficients were obtained between the first-order rate constants k and washing effluents properties. The results obtained indicated that the degradation rate of PCP mainly depended on the concentration of PCP and TX100 in the wasted effluents, while othe substances washed out from soil showed very limited impact on the photocatalysis procedure.

• Periodical: Advanced Materials Research (Volume 878)
• Pages: 791-796
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.878.791
• Online since: January 2014
• Authors: Ya Xin Zhang, Hong Tao Wang
• Keywords: PCP, Photodegradation, Soil Washing, TX100

References

[1] W. Zhou, L.Z. Zhu, Enhanced soil flushing of phenanthrene by anionic-nonionic mixed surfactant, Water Res, 42 (2008) 101-108.

DOI: 10.1016/j.watres.2007.07.021

[2] M.S. Rodriguez-Cruz, M.J. Sanchez-Martin, M. Sanchez-Camazano, A comparative study of adsorption of an anionic and a non-ionic surfactant by soils based on physicochemical and mineralogical properties of soils, Chemosphere, 61 (2005) 56-64.

DOI: 10.1016/j.chemosphere.2005.03.016

[3] Z.M. Zheng, J.P. Obbard, Evaluation of an elevated non-ionic surfactant critical micelle concentration in a soil/aqueous system, Water Res, 36 (2002) 2667-2672.

DOI: 10.1016/s0043-1354(01)00472-9

[4] D.H. Lee, H.W. Chang, R.D. Cody, Synergism effect of mixed surfactant solutions in remediation of soil contaminated with PCE, Geosci J, 8 (2004) 319-323.

DOI: 10.1007/bf02910251

[5] H.S. Yu, L.Z. Zhu, W.J. Zhou, Enhanced desorption and biodegradation of phenanthrene in soil-water systems with the presence of anionic-nonionic mixed surfactants, J Hazard Mater, 142 (2007) 354-361.

DOI: 10.1016/j.jhazmat.2006.08.028

[6] L.Z. Zhu, W.J. Zhou, Partitioning of polycyclic aromatic hydrocarbons to solid-sorbed nonionic surfactants, Environ Pollut, 152 (2008) 130-137.

DOI: 10.1016/j.envpol.2007.05.001