Acid leaching transformation characteristics and environmental risk of ester liquid crystals
WANG Zi-you1,2, WANG Yi-bo2, XU Wen-lai1, RUAN Jiu-li2, BI Ying-ying2, ZHAO Ruo-nan2, GUO Yu-wen2
1. School of Ecological Environment, Chengdu University of Technology, Chengdu 610059, China; 2. State Key Laboratory of Environmental Protection and Ecological Industry, Research Center of Cleaner Production and Circular Economy, Chinese Research Academy of Environment Sciences, Beijing 100012, China
Abstract：Ester liquid crystal was selected as the research object. Gas Chromatography-Mass Spectrometry (GC-MS) and Fourier Transform Infrared Spectroscopy (FTIR) were used to reveal the effects of different leaching conditions on its decomposition, transformation and by-products. The toxicity and environmental risk of the by-products were evaluated by the toxicity assessment software, ECOSAR. The results showed that the decomposition rate of the ester liquid crystal increased with the sulfuric acid concentration (46.3%), reaction time (25.33%) and reaction temperature (35.41%). However, the by-product types were not affected by the change in leaching conditions. The ester liquid crystal was decomposed into compounds containing acyl, carboxyl, hydroxyl groups and other groups under the strong oxidation of sulfuric acid. These compounds were further bonded to form intermediates and small molecular organics. The by-products included cyanobiphenol, cyclopentanoic acid, 2-acetyl-5-methyl-phenol, 3-nonenoic acid and 4-pentylphenol. The formation of the by-products was related to the chemical constitution of the parent liquid crystal. These by-products were toxic, except for the cyclopentanoic acid and 2-acetyl-5-methyl-phenol. Therefore, the potential threat to the environment require attention.
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