Photolysis, Sonolysis, and Photosonolysis of Trichloroethane (TCA), Trichloroethylene (TCE), and Tetrachloroethylene (PCE) Without Catalyst

Abstract

Photolysis, sonolysis, and photosonolysis of common groundwater contaminants, namely 1,1, 1-trichloroethane, trichloroethylene, and tetrachloroethylene, were investigated using a flow-through photosono reactor system. Simulated groundwater containing the chlorinated volatile organic compounds (VOCs) was exposed to ultraviolet light (UV), ultrasonication (US), and UV and US concurrently (UVUS), without a photo catalyst. VOC removal efficiencies of the UV, US, and UVUS treatment processes were computed from the VOC concentrations in influent and effluent of the reactor. The process using UVUS exhibited larger degradation efficiencies than that with UV and US separately in most cases; however, statistical analysis showed that the UVUS treatment efficiency is likely to be additive of the UV and US treatment efficiencies. The results also showed that the increase of the detention time from 26 to 60 min had no significant effect on the VOC removal efficiencies in these processes.

Photoelectrocatalysis on TiO2 meshes: different applications in the integrated urban water management

“…In fact, the removal yields of TCE+PCE were 88% and 96% after just 15 min of reaction time with UV and PEC, respectively. The literature confirms these results reporting that photolytic process is effective on the removal of TCE and PCE (Rashid and Sato 2011), and the addition of the TiO 2 catalyst in immobilized form increases the efficiency of the process (Grzechulska-Damszel et al 2014;Franz et al 2020b).…”

Enhanced Photocatalytic Activity of TiO2 Nanosheets by Doping with Cu for Chlorinated Solvent Pollutants Degradation

“…According to the observed results, the main peak appeared in above spectrum at the same position (531.71. eV) is attributed to O II to surface adsorbed oxygen (O 2– or O – ), – OH groups, and oxygen vacancies. This analysis may explain the relative high photocatalytic activity of TiO 2 for the degradation of chlorinated solvent pollutants and nitrobenzene. , Previous studies have reported that those species are the main oxidative intermediate in the mineralization reaction of organic pollutants. , The carbon peak is attributed to the residual carbon from the sample and adventitious hydrocarbon from the XPS instrument itself, while the detected fluorine species identified in Figure can be attributed to the TiF surface bonds formed by ligand exchange reaction between F – and the surface hydroxyl group on the surface of TiO 2 . ,, According to the XPS analysis, Cu doping did not modified the surface state of the synthesized products, probably due to the synthesis method used in our experiment. Moreover, previous studies claimed that the addition of few Cu promoted charge separation and inhibited photoexcited electrons and holes recombination, therefore enhancing photocatalytic activity (0.5Cu-TiO 2 ) .…”

Degradasi Zat Warna Methanil Yellow Menggunakan Metoda Fotosonolisis dengan Bantuan Katalis ZnO

“…Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Padang (UNP) Jl. Prof. Hamka, Air Tawar, Padang, Sumatera Barat, Indonesia, 25131 Dari beberapa metode tersebut metode yang paling efektif digunakan dalam mendegradasi limbah zat warna adalah dengan metode fotosonolisis [5] Fotosonolisis adalah metode yang digunakan untuk mendegradasi zat warna pada limbah cair ini, yang merupakan kombinasi dari metodefotolisis dan sonolisis yang dianggap lebih efisien danefektif dalam mendegradasi zat warna. Fotosonolisis merupakan bagian dari proses oksidasi lanjut (AOPs: Advanced Oxydation Process).Pada proses fotolisis terjadi interaksi antara sinar radiasi UV/Visible dengan molekul air sedangkan pada sonolisis menghasilkan gelombang mekanik yang dipengaruhi oleh efek kavitasi pada air [1].…”