Heterogeneous Photocatalytic Degradation of Triton X-100 in Aqueous TiO2 Suspensions
American Journal of Environmental Protection
Volume 3, Issue 1, February 2014, Pages: 28-35
Received: Jan. 23, 2014; Published: Feb. 20, 2014
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Yanlin Zhang, School of Chemistry and Environment, South China Normal University, Guangzhou, P.R.China
Yufang Wan, Library of South China Normal University, Guangzhou, P.R.China
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The increasing utilization of surfactants generates a great amount of wastes. Surfactants and their more toxic degradation by-products in the environment affect the biota greatly. In particular, the low biodegradation of nonionic surfactants requires efficient oxidation treatments. In addition, the extracted contaminants by high concentrations of non-ionic surfactants in soil remediation may be completely treated using advanced oxidation process and thus the degradation of non-ionic surfactants needs to be checked in this case. The photocatalytic degradation of Triton X-100, a non-ionic surfactant, in aqueous titania suspensions was investigated as a function of catalyst dosage, pH, addition of hydrogen peroxide, potassium persulfate, and Tert-butyl alcohol. For the treatment of 20 mg/L Triton X-100 solutions, the optimum catalyst dosage and pH were determined to be 1 g/L and 6, respectively. The degradation efficiency of Triton X-100 by potassium persulfate was higher than that by hydrogen peroxide when the same mol of oxidants were used. Tert-butyl alcohol can strongly inhibit the photocatalytic oxidation reactions of Triton X-100. The degradation rates as a function of initial surfactant concentrations were interpreted by using a Langmuir-Hinshelwood model. With 0.2 g/L titania or even an additional 0.1 g/L hydrogen peroxide to completely degrade 1 mg/L phenanthrene in a 2 g/L Triton X-100 solution within 30 min, in this case the degradation efficiency of Triton X-100 was less than 5%. This proved that the strategy that surfactants were used as solubilizing agents for the removal of contaminants from soils followed by heterogeneous photocatalytic degradation was feasible.Within 120 min, 2 g/L of Triton X-100 can be degraded up to 67% by the addition of both 1 g/L titania and 1 g/L hydrogen peroxide. Under the right conditions, Triton X-100 can be completely degraded.
Triton X-100, Photocatalytic Degradation, Titania, Kinetics
To cite this article
Yanlin Zhang, Yufang Wan, Heterogeneous Photocatalytic Degradation of Triton X-100 in Aqueous TiO2 Suspensions, American Journal of Environmental Protection. Vol. 3, No. 1, 2014, pp. 28-35. doi: 10.11648/j.ajep.20140301.14
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