『Abstract
The photooxidation degradation of tri (2-chloroethyl) phosphate
(TCEP) by combining UV with hydrogen peroxide as oxidant was primarily
studied in the present study by evaluating various treatment parameters.
The results suggested that light intensity, initial pH and concentration
of RCEP and H2O2, and
reaction time affected the degradation efficiently of TCEP. The
total organic carbon (TOC) removal rates, and the yield rates
of Cl- and PO43- reached
up to 86％, 94％ and 97％, respectively, under the optimized conditions
in the present study. The degradation process obeyed the pseudo-first-order
kinetic reaction expressed as ln (Ct/C0) = -0.0275 t with a R2 of 0.9962.
The addition of t-butanol indicated that hydroxyl radicals played
an important role in the degradation of TCEP. The primary investigation
of the degradation mechanism of TCEP suggested that TCEP molecules
were attacked by hydroxyl radicals produced from H2O2 with the irradiation of UV light, PO43-,
Cl- and chlorinated alcohol/aldehyde, and/or non-chlorinated
aldehyde with small molecular weight were produced, these produced
small organic molecules were furthered oxidized to acids, most
of them were finally mineralized to CO2 and
H2O. The present technology was successfully
applied for degrading TCEP in simulated real wastewater, which
shows a promising potential for treating similar contaminants
using corresponding advanced oxidation technology.
Keywords: Tri (2-chloroethyl) phosphate; Ultraviolet light; Photodegradation;
H2O2』
1. Introduction
2. Materials and methods
2.1. Materials
2.2. Experimental procedures
2.3. Analytical methods
2.3.1. Cl- and PO43-
analysis
2.3.2. Residual TCEP and oxidation intermediate products analysis
2.4. Data analysis
3. Results and discussion
3.1. Effect of reaction time
3.2. Effect of the initial H2O2
concentration
3.3. Effect of light intensity
3.4. Effect of pH value
3.5. Effect of the initial concentration of TCEP (C0)
3.6. Evaluation of degradation mechanism
3.7. Method application for degrading TCEP in real wastewater
4. Conclusions
Acknowledgments
References