Thermal Assisted UV Digestion Utilizing Nano-TiO₂ Photocatalyst for the Detection of Total Phosphorous

Abstract:

This work presents a novel thermal assisted ultra-violet (UV) photocatalysis oxidation method for total phosphorus (TP) detection. A 365nm wavelength UV light was used as the UV light source, and the TiO₂ particles, immobilized on silicon wafer, were used as the catalyst. The sodium glycerophosphate was digested as the typical compound of TP. The digested samples were determined by spectrophotometry after the phosphomolybdenum blue reaction. The catalyst can be used repetitively with long-term stability in this work. For the photocatalysis digestion process under room-temperature, when the reaction time reached 120min, the conversion rates were 92.31% and 93.66% for 1mg/L and 4mg/L of C₃H₇Na₂O₆P solutions, respectively. And conversion rates were 95.48% and 99.37% respectively for thermal assisted ultra-violet (UV) photocatalysis digestion process at the condition of 30min and 60°C. Compared with the conventional thermal digestion method and photocatalysis digestion method for TP detection, this thermal assisted UV digestion method can greatly decrease the digestion time and enhance the efficiency.

• Periodical: Key Engineering Materials (Volumes 562-565)
• Pages: 964-969
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.562-565.964
• Online since: July 2013
• Authors: Tian Dong, Jian Hua Tong, Chao Bian, Jizhou Sun Sun, Shan Hong Xia
• Keywords: Oxidant-Free, Thermal Assisted, TiO₂, UV Digestion

References

[1] I.D. McKelvie, D. Peat, P.J. Worsfold, Analytical perspective. Techniques for the quantification and speciation of phosphorus in natural waters, Analytical Proceedings 32 (1995) 437.

DOI: 10.1039/ai9953200437

[2] B. Roig, C. Gonzalez, O. Thomas, Measurement of dissolved total nitrogen in wastewater by UV photooxidation with peroxodisulphate, Analytica Chimica Acta 389 (1999) 267-274.

DOI: 10.1016/s0003-2670(99)00212-3

[3] Kimberly A. Mace, Robert A. Duce, On the use of UV photo-oxidation for the determination of total nitrogen in rainwater and water-extracted atmospheric aerosol, Atmospheric Environment 36 (2002) 5937-5946.

DOI: 10.1016/s1352-2310(02)00802-6

[4] Daniela Daniel, Ivano G.R. Grutz, Microfluidic cell with a TiO2- modified gold electrode irradiated by an UV-LED for in situ photocatalytic decomposition of organic matter and its potentiality for voltammetric analysis of metal ions, Electrochemistry Communications 9 (2007).

DOI: 10.1016/j.elecom.2006.10.014

[5] Mehdi Shirzad Siboni, Mohammad-Taghi Samadi, Jae-Kyu Yang, Seung-MokLee, Photocatalytic removal of Cr(VI) and Ni(II) by UV/TiO2: kinetic study, Desalination and Water Treatment 40 (2012) 77–83.

DOI: 10.5004/dwt.2012.2586

[6] Mehmet Uğurlu, M. Hamdi Karaoğlu, Removal of AOX, total nitrogen and chlorinated lignin from bleached Krsft mill effluents by UV oxidation in the presence of hydrogen peroxide utilizing TiO2 as photocatalyst, Environmental Science and Pollution Research 16 (2009).

DOI: 10.1007/s11356-008-0044-x

[7] J.C. Garcia, J.L. Oliveira, A.E.C. Silva, C.C. Oliveira, J. Nozaki, N.E. de Souza, Comparative study of the degradation of real textile effluents by photocatalytic reactions involving UV/TiO2/H2O2 and UV/Fe2+/H2O2 systems, Journal of Hazardous Materials 147 (2007).

DOI: 10.1016/j.jhazmat.2006.12.053

[8] Xiao-Lan Huanga, Jia-Zhong Zhang, Rate of phosphoantimonylmolybdenum blue complex formation in acidic persulfate digested sample matrix for total dissolved phosphorus determination: Importance of post-digestion pH adjustment Talanta 77 (2008).

DOI: 10.1016/j.talanta.2008.06.041

[9] E Brillas, RM Bastida, E Llosa, J Casado. Electrochemical Destruction of Aniline and 4-Chloroaniline for Wastewater Treatment Using a Carbon-PTFEO-Fed Cathode, Journal of the Electrochemical Society 142(1995) 1733.

DOI: 10.1149/1.2044186