活性白土对模拟油脂中β-胡萝卜素和叶绿素的吸附动力学研究(英文)

The textural properties of acid-activated bentonite(AAB),which were prepared using four different concentrations of sulfuric acid,were analyzed by adsorption-desorption isotherm of nitrogen using an automated specific surface area and porosity analyzer.The total pore volume,specific surface area and average pore diameter of these four kinds of AAB show a regular changing trend,increasing first and then decreasing,the optimum of which can be achieved at a sulfuric acid concentration of 25%(sample A25).The kinetic analysis of the adsorption ofβ-carotene and chlorophyll in model oil solutions,namely,xylene and edible oil solution,has been investigated by using AAB.Experimental results indicated that the adsorption data fit the pseudo-second-order model well.The whole adsorption process of the two pigments on AAB was divided basically into two parts:the initial adsorption of pigments was rapid in the first 10 min,followed by a slower adsorption process till equilibrium was attained at 60 min.In addition,the amount and rate of adsorption on A25 increase synchronously with the initial pigment concen- tration and temperature.The results showed that the adsorption kinetics behavior of AAB with respect to the pig- ments is not influence by the xylene and edible oil solution.