The Destruction of Carbon Tetrachloride Dissolved in Water in a Dielectric Barrier Discharge in Oxygen
- 40 Downloads
The kinetics of decomposition of tetrachloromethane (TCM) in its aqueous solutions and the kinetics of decomposition products formation was investigated under the action of DBD at atmospheric pressure in oxygen in a falling-flow reactor. The range of initial concentrations of TCM was 25–325 μmol/l, the discharge power—2–11 W and O2 flow rates—1–3 cm3/s. It is shown that the kinetics of the TCM decomposition can be described by the equation of pseudo-first kinetic order. The rate constant depended weakly on the discharge parameters and was ~ 5 s−1. The energy efficiency of the decomposition, depending on the parameters, was 0.1–1.3 molecules per 100 eV. When the residence time of the solution with the discharge zone is more than 1 s, it is possible to achieve almost 100% degree of TCM decomposition. It is shown that the main products of the TCM decomposition in the liquid phase are aldehydes and Cl− ions, and in the gas phase—the molecules CO and CO2. The results for energy efficiency are compared with the results obtained in other AOP’s processes (Fenton process, photocatalytic process, the radiation process by the action of high-energy electron flux). It is shown that the action of the DBD is more effective than the action of the above processes.
KeywordsOxygen DBD Kinetics Carbon tetrachloride Decomposition
This study was carried out in the frame of Project part of State Assignment of the Ministry of Education and Science of the RF, No 3.1371.2017/4.6 and it was supported by the RFBR Grant, Project No. 18-08-01239 A.
- 1.Wu H, Feng Q (2017) Fabrication of bimetallic Ag/Fe immobilized on modified biochar for removal of carbon tetrachloride. JES 54:346–357Google Scholar
- 2.Order of the Government of the Russian Federation of July 8, 2015 No. 1316-rGoogle Scholar
- 13.Bird RB, Stewart WE, Lightfoot EN (1960) Transport phenomena. Wiley, New York, p 37Google Scholar
- 14.Hillebrand WF, Lundell GEF (1953) Applied inorganic analysis, 2nd edn. Wiley, New-YorkGoogle Scholar
- 15.Russian National Standard GOST R 55227-2012. Water. Methods for determining the content of formaldehyde (in Rusian) Google Scholar
- 16.Lurie YY (1984) Analytical chemistry of industrial waste waters. Khimiya, Moscow (in Russian) Google Scholar
- 17.Parkinson WH, Yoshino K, Freeman DE (1988) Absolute absorption cross section measurements of ozone and the temperature dependence at four reference wavelengths leading to renormalization of the cross section between 240 and 350 nm. Smithsonian Institution Astrophysical Observatory, Cambridge, p 02138Google Scholar
- 24.Atkinson R, Baulch DL, Cox RA, Hampson RF, Kerr JA, Rossi MJ, Troe J (1997) Evaluated kinetic and photochemical and heterogeneous data for atmospheric chemistry. Supplement V IUPAC Subcommittee on gas kinetic data evaluation for atmospheric chemistry. J Phys Chem Ref Data 26(3):521–1011CrossRefGoogle Scholar
- 32.Rumbach P, Bartels DM, Sankaran RM, Go DB (2015) The solvation of electrons by an atmospheric-pressure plasma. Nat Commun 6(7248):1–6Google Scholar