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Photoassisted degradation of pentachlorophenol in a simulated soil washing system containing nonionic surfactant Triton X-100 with La–B codoped TiO2 under visible and solar light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
46873 46451 2011 9 PDF Available
Title
Photoassisted degradation of pentachlorophenol in a simulated soil washing system containing nonionic surfactant Triton X-100 with La–B codoped TiO2 under visible and solar light irradiation
Abstract

A novel method to remediate soil washing contaminants was developed through the utilization of La–B codoped TiO2 (La–B–TiO2) nanoparticle in the photocatalysis of a simulated complex system containing hydrophobic pentachlorophenol (PCP) and nonionic surfactant Triton X-100 (TX-100) under visible and solar light irradiation. The photocatalyst synthesized by the sol–gel hydrothermal process exhibited excellent visible light photocatalytic activity and a modified surface. The investigation of the adsorption kinetics and isotherms showed that the distribution of PCP between the catalyst surface and the bulk solution significantly depended on the initial TX-100 concentration (CTX-0). The formed superficial reactive monolayer at CTX-0 ranging from 0.023 to 0.23 mM by the dramatic hydrophobic interactions between the TX-100 moiety and hydrophobic sites on the La–B–TiO2 could remarkably capture the target pollutant. The PCP implanted into the hydrophobic space could be removed effectively in the photocatalysis process induced by visible and solar light, ascribing to the facile availability of PCP to the photo-yielded oxidative radicals on the La–B–TiO2 surface. Additionally, the preferential decomposition of the incorporated PCP, rather than the TX-100, facilitated the removal of the target contaminant and the recycling of the surfactant, which is beneficial to the practical application of this technique under mild and natural light sources.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► Novel remediation method to soil washing system containing the chlorinated pollutant. ► Synthesized La–B–TiO2 with high visible light absorption and a modified surface. ► Formed monolayer by hydrophobic interactions between TX-100 and sites on catalyst. ► Remarkable capturing of the target PCP in superficial monolayer on catalyst. ► Efficient decomposition of implanted pollutant under visible and solar light.

Keywords
Photocatalysis; Hydrophobic chlorinated pollutant; Hydrophobic adsorption; Modified nanoparticle
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Photoassisted degradation of pentachlorophenol in a simulated soil washing system containing nonionic surfactant Triton X-100 with La–B codoped TiO2 under visible and solar light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 103, Issues 3–4, 5 April 2011, Pages 470–478
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us