Hydrothermal decomposition of liquid crystal in subcritical water

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• 作者：Xuning Zhuang^a ; ^b ; Wenzhi He^a ; ^{hithwz@163.com" class="auth_mail} ; Guangming Li^a ; Juwen Huang^a ; Shangming Lu^a ; Lianjiao Hou^a
• 关键词：Waste LCDs ; Liquid crystal ; 4-octoxy-4&rsquo ; -cyanobiphenyl ; Hydrothermal technology ; Decomposition
• 刊名：Journal of Hazardous Materials
• 出版年：30 April, 2014
• 年：2014
• 卷：271
• 期：Complete
• 页码：236-244
• 全文大小：893 K

文摘

Treatment of liquid crystal has important significance for the environment protection and human health. This study proposed a hydrothermal process to decompose the liquid crystal of 4-octoxy-4鈥?cyanobiphenyl. Experiments were conducted with a 5.7 mL stainless tube reactor and heated by a salt-bath. Factors affecting the decomposition rate of 4-octoxy-4鈥?cyanobiphenyl were evaluated with HPLC. The decomposed liquid products were characterized by GC-MS. Under optimized conditions i.e., 0.2 mL H₂O₂ supply, pH value 6, temperature 275 掳C and reaction time 5 min, 97.6% of 4-octoxy-4鈥?cyanobiphenyl was decomposed into simple and environment-friendly products. Based on the mechanism analysis and products characterization, a possible hydrothermal decomposition pathway was proposed. The results indicate that hydrothermal technology is a promising choice for liquid crystal treatment.