Department of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, China.
J Hazard Mater. 2010 Jun 15;178(1-3):844-50. doi: 10.1016/j.jhazmat.2010.02.015. Epub 2010 Feb 12.
Konjac glucomannan treated by alkali solution through deacetylated reaction was used as a new water insoluble adsorbent to remove tannin from aqueous solution. A comprehensive study on adsorption of tannin by deacetylated konjac glucomannan (DKGM) was conducted regarding the effects of initial pH, adsorbent dosage, contact time, temperature and initial tannin concentration. The adsorption process was much dependent on the pH and temperature and was found to follow pseudo-second-order kinetics. The optimum pH value was at pH ranging from 2 to 6. The maximum removal efficiency of tannin from aqueous solution was 90%. Increasing the adsorption temperature would result in lower adsorption capacity, suggesting that adsorption of tannin onto DKGM was exothermic in nature. The adsorption isotherms were measured at various temperatures and correlated to Freundlich isotherms. Adsorption mechanism was confirmed that the interaction of DKGM and tannin was through hydrogen bonding. It was also observed that DKGM possesses excellent reusability for tannin removal.
经过脱乙酰反应的碱溶液处理的魔芋葡甘聚糖被用作一种新的水不溶性吸附剂，从水溶液中去除单宁。本文对脱乙酰魔芋葡甘聚糖（DKGM）吸附单宁的过程进行了综合研究，考察了初始 pH 值、吸附剂用量、接触时间、温度和初始单宁浓度等因素的影响。吸附过程对 pH 值和温度的依赖性很大，符合准二级动力学模型。最佳 pH 值范围为 2 至 6。DKGM 对水溶液中单宁的最大去除效率为 90%。增加吸附温度会导致吸附容量降低，表明 DKGM 对单宁的吸附是放热的。在不同温度下测量了吸附等温线，并与 Freundlich 等温线相关联。吸附机理证实，DKGM 和单宁之间的相互作用是通过氢键实现的。实验还观察到，DKGM 对单宁的去除具有良好的可重复使用性。
