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Application of Tio2–P25 in the photodegradation of N–lauryl diethanolamine and cinnamic acid in presence of oxygen

In this paper, the activity of TiO2–P25 in the photodecomposition of recalcitrant organic compounds such as n–lauryl diethanolamine (n–LDA) and cinnamic acid (CA) solution in UV + BLED light in presence of oxygen was investigated and the optimum conditions of reaction were determined. | Journal of Science and Technology 55 (xx) (2017) 249–256 APPLICATION OF TiO2–P25 IN THE PHOTODEGRADATION OF n–LAURYL DIETHANOLAMINE AND CINNAMIC ACID IN PRESENCE OF OXYGEN Loc L. C. 1, 2, *, Anh H. C. 2, Anh N. P. 2, Tot N. T. N. 2, Quy N. N. 2, Tri N. 1, Cuong H. T. 1, Van N. T. T. 1 1 Institute of Chemical Technology, Vietnam Academy of Science and Technology 1 Mac Dinh Chi Street, Ward 1, District 1, Ho Chi Minh City, Vietnam 2 Faculty of Chemical Engineering, University of Technology–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam * Email: camloc.luu@gmail.com Received: 30 December 2017; Accepted for publication: 9 March 2017 ABSTRACT In this paper, the activity of TiO2–P25 in the photodecomposition of recalcitrant organic compounds such as n–lauryl diethanolamine (n–LDA) and cinnamic acid (CA) solution in UV + BLED light in presence of oxygen was investigated and the optimum conditions of reaction were determined. With physicochemical characteristics such as anatase/rutile ratio of 80/20, the crystallite size of 23 nm, BET surface area of 43.6, the light absorption wavelength of 390 nm, band gap energy of 3.17 eV, and point of zero charge of 6.3, TiO2–P25 catalyst is able to photodecompose more than 95 % of LDA and CA after 90 minutes in presence of oxygen under irradiation of UV–B light. Keywords: cinnamic acid, n–lauryl diethanolamine, oxygen, TiO2–P25. 1. INTRODUCTION Pollution of persistent organic compounds (POCs) is one of the primary concerns. In wastewater, POCs are usually aromatic hydrocarbons, condensed polycyclic compounds, organochlorines. These matters are highly toxic to organisms and humans and derived from various sources [1]. Until now, photocatalysis is considered as a capable method to degrade thoroughly POCs [2], reusable treated wastewater [3]. Currently, TiO2 – Degussa P25 (TiO2– P25) is one of the commercial photocatalysts that is highly active and commonly used. TiO2– P25 is used in treatment of .