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8Impact Factor: SJIF 2021 - 5.81 2022 - 5.94
ХИМИЧЕСКИЕ НАУКИ CHEMICAL SCIENCES
UDC 544.5, 543.2
GAMMA RADiOLYSiS OF BENZENE SOLUTiON OF 1,2,4-TRiCHLOROBENZENE
SAMiR KARiMOV
Lecturer, Chemitry department of French Azerbaijani University under ASOIU, Baku, Azerbaijan
ELSHAD ABDULLAYEV
Vice rector, Sumgait State University, Sumgait, Azerbaijan
MUSLUM GURBANOV
Head of lab, Institue of Radiation Problems of ANAS, Baku, Azerbaijan
Abstract. Gamma radiation from a 60Co source was employed, and qualitative as well as quantitative changes in the sample solutions of 1,2,4-trichlorobenzene (TCB) + benzene were analyzed using gas chromatography-mass spectrometry (GC-MS). Our findings demonstrate a 100% conversion of TCB, resulting in the formation of various less chlorinated benzenes and other chlorinated and non-chlorinated organic compounds. The proposed dechlorination pathway includes the stepwise dehalogenation of TCB to 1,4-, 1,3-, and 1,2-dichlorobenzenes (DCB), chlororbenzene and ultimately benzene. Despite the complete dechlorination of TCB in benzene solution under gamma irradiation, the formation of chlorinated polyaromatic compounds, such as polychlorinated biphenyls (PCBs) and chlorinated terphenyls, indicates that benzene is not a suitable solvent for the degradation of TCB through gamma radiolysis. For degradation of TCB suggested media is protic polar solvent - methanol.
Keywords. Trichlorobenzene, Radiation chemistry, Nuclear energy, POPs, Environmental remediation
The application of ionizing radiation could be an effective way for cleaaness of toxic compounds via destruction of the molecule. Some researches have been carried out and reported in this field to study the effect of radiation on environmental treatment. The pros of radiation technological methods are to be single step, in most cases, is aplicable without any specific condition, no addittives are required as catalyst. TCB is one of the reduction product of HCB, and forms during its dehydrohalogenation reported by [1]. The effect of gamma rays on HCB molecule has also been investigated by ourselves and found that TCB is byproduct of radiolysis of HCB in different organic media. That is why, 1,2,4-trichlorobenzene (TCB) has been selected as research object in this study to follow full dechlorination pathway of HCB, as well as TCB in benzene under gamma rays.
Byproduct diversity of gamma radiolysis of TCB + benzene is wide. From little molecules to long polycyclic compounds, such as benzene and terphenyls have been identified in GC-MS. All identified main product molecules of TCB + benzene can be classified in 9 groups: The derivatives of cyclohexane; mononuclear aromatic derivatives; aliphatic hydrocarbons; oxygenated derivatives; chlorinated aliphatic derivatives; chlorinated terphenyls; polycyclic aromatic hydrocarbons; chlorinated benzenes (CBs); polychlorinated aromatic compounds. Among these groups CBs are the most important target of products to be studied. Starting with 1,4-dichlorobenzene and progressing to monochlorobenzene, and finally to completely dechlorinated benzene formation suggests a stepwise removal of chlorine atoms [2]. This pathway likely involves successive cleavage of C-Cl bonds, leading to gradual dechlorination of the TCB molecule.
Impact Factor: SJIF 2021 - 5.81 2022 - 5.94
ХИМИЧЕСКИЕ НАУКИ CHEMICAL SCIENCES
REFERENCES
1. Beck, U.; Löser, E. Chlorinated Benzenes and other Nucleus-Chlorinated Aromatic Hydrocarbons/U. Beck, E. Löser// Ullmann's Encyclopedia of Industrial Chemistry. -2003.-Vol.8, p.488
2. Karimov S. Radiolytic degradation of 1,2,4-trichlorobenzene (TCB) in some organic solvents by gamma rays./S. Karimov, E. Abdullayev, M. Millet, M. Gurbanov// Heliyon.-2024.-Vol.10,No.10 https://doi.org/10.1016/j.heliyon.2024.e31547
