酯类液晶酸浸分解转化特性及环境风险

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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.

Key words： liquid crystal monomers decomposition and transformation acid pickling leaching toxicity environmental risk

Received: 23 June 2022

PACS:	X783
	X705

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	Articles by authors
	WANG Zi-you
	WANG Yi-bo
	XU Wen-lai
	RUAN Jiu-li
	BI Ying-ying
	ZHAO Ruo-nan
	GUO Yu-wen

Cite this article:

WANG Zi-you,WANG Yi-bo,XU Wen-lai等. Acid leaching transformation characteristics and environmental risk of ester liquid crystals[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 552-560.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/552

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