新生磷酸钙对没食子酸的吸附性能研究  

Adsorption characteristics of gallic acid on fresh calcium phosphate

作　　者：田玉红[1] 徐想丽[1] 李利军[1] 周琪[1] 

机构地区：[1]广西科技大学生物与化学工程学院,广西柳州545006

出　　处：《食品工业科技》2014年第8期126-130,共5页Science and Technology of Food Industry

基　　金：国家自然科学基金(31060219);2011年度广西高等学校优秀人才资助计划项目(桂教人[2011]40号)

摘　　要：研究了新生磷酸钙对没食子酸的吸附特性。根据对吸附动力学数据进行的粒内扩散模型、准一级动力学模型和准二级动力学模型的拟合结果可知,当没食子酸的初始浓度分别为25、50、75mg/L时,新生磷酸钙对没食子酸的吸附过程均可用准二级动力学方程描述（R2=0.9943~0.9946）。pH是影响吸附作用的重要因素,当pH在7.2~7.5之间时,没食子酸的吸附量达到最大值。吸附等温曲线符合Langmuir模型（R2=0.9965）,由Langmuir线性拟合方程可得新生磷酸钙对没食子酸的饱和吸附量为8.4317mg/g。The adsorption characteristics of gallic acid on fresh calcium phosphate were discussed. Three kinetic models,including pseudo-first-order model,pseudo-second-order model and intraparticle diffusion model,were selected to follow the adsorption processes. The results showed that the pseudo-second-order equation provided the best correlation to the experimental data（ R2= 0. 9943 ~ 0. 9946）, under the initial gallic acid concentration were 25,50,75mg/L. pH value was an important factor for affecting adsorption. The amount of adsorbed gallic acid reached maximum when pH value was between 7.2 and 7.5. The results showed that the adsorption isotherm could be described by Langmuir model（R2=0.9965）,and the saturated adsorption capacity reached 8.4317mg/g.

关 键 词：新生磷酸钙 没食子酸 吸附动力学 吸附等温线 

分 类 号：TS241[轻工技术与工程—制糖工程]