State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, No. 1239 Siping Road, Shanghai 200092, PR China; Shanghai Cooperative Centre for WEEE Recycling, Shanghai Second Polytechnic University, No. 2360 Jinhai Road, Shanghai 201209, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, No. 1239 Siping Road, Shanghai 200092, PR China.
J Hazard Mater. 2014 Apr 30;271:236-44. doi: 10.1016/j.jhazmat.2014.02.010. Epub 2014 Feb 18.
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'-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'-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°C and reaction time 5 min, 97.6% of 4-octoxy-4'-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.
液晶的处理对环境保护和人类健康具有重要意义。本研究提出了一种水热法来分解 4-辛氧基-4'-氰联苯的液晶。实验在 5.7 mL 不锈钢管式反应器中进行，通过盐浴加热。采用高效液相色谱法（HPLC）评价了影响 4-辛氧基-4'-氰联苯分解率的因素。通过气相色谱-质谱联用（GC-MS）对分解得到的液体产物进行了表征。在优化条件下，即 0.2 mL H2O2 用量、pH 值 6、温度 275°C 和反应时间 5 min，97.6%的 4-辛氧基-4'-氰联苯分解为简单、环保的产物。基于机理分析和产物表征，提出了一种可能的水热分解途径。结果表明，水热技术是处理液晶的一种有前途的选择。
