离子交换树脂对冰葡萄汁总酸和总酚的静态吸附动力学研究

Static adsorption kinetics of total acid and total phenol in ice grape juice with ion exchange resin

该实验研究了D354树脂对冰葡萄汁总酸和总酚的静态吸附动力学模型。结果表明,随吸附温度的升高,D354树脂对冰葡萄汁总酸和总酚的吸附速率显著提高(P<0.05)。在0℃、10℃和20℃条件下,D354树脂对冰葡萄汁总酸的最大吸附量分别为151.69 mg/g、190.09 mg/g及222.16 mg/g;对冰葡萄汁总酚的最大吸附量分别为3.65 mg/g、4.20 mg/g及4.67 mg/g;D354树脂吸附冰葡萄汁总酸和总酚的过程符合拟二阶动力学模型(R^2>0.998 0),并确定了D354树脂对冰葡萄汁总酸和总酚的拟二阶动力学方程;利用W-M(WeberMorris)动力学模型对数据拟合(R^2>0.930 0),结果表明整个静态吸附过程受粒内扩散和液膜扩散共同控制。

The static adsorption kinetics of D354 resin to total acid and total phenol in ice grape juice was studied. The results showed that the adsorption rate of D354 resin to total acid and total phenol in ice grape juice was significantly increased with the increase of adsorption temperature（P〈0.05）.At 0 ℃, 10 ℃ and 20 ℃, the maximum adsorption capacities of D354 resin to total acid in ice grape juice were 151.69 mg/g, 190.09 mg/g and 222.16 mg/g,respectively. The adsorption capacities to total phenol in ice grape juice were 3.65 mg/g, 4.20 mg/g, and 4.67 mg/g, respectively. Adsorption of total acids and total phenol from ice grape juice by D354 resin conformed to pseudo second-order kinetics model（R^2〉0.998 0）. The kinetic equation of D354 resin adsorbed total acid and total phenol in ice grape juice was determined. The data was fitted by W-M kinetics model（R^2〉0.930 0）, and the results showed that the whole adsorption process was controlled by both intra-particle diffusion and liquid-film diffusion.