甜菜粕对钙和铅的吸附性能研究  

Adsorption property of Ca^(2+) and Pb^(2+) by sugar beet pulp

作　　者：陈博儒 吴佳娜[1] 

机构地区：[1]华南理工大学食品科学与工程学院,广东广州510640

出　　处：《粮食与饲料工业》2016年第11期37-40,共4页Cereal & Feed Industry

基　　金：国家自然科学基金项目(U1203183);广东省科技计划项目(2013B020310006;2014A020209019和2015A020210039);华南理工大学中央高校基本科研业务费专项资金资助项目(2014ZZ0050)

摘　　要：甜菜粕是重金属离子螯合剂和吸附剂。研究了溶液pH值、温度、时间及初始质量浓度等条件对甜菜粕(SBP)吸附轻金属离子Ca^(2+)和重金属离子Pb^(2+)的性能,并体外模拟在人体肠道环境条件(pH7.0、37℃)下,研究SBP对钙和铅的吸附性能和机理。结果表明:SBP对铅的螯合大于对钙的吸附;溶液pH值为7.0时吸附效果最佳;Ca^(2+)、Pb^(2+)分别在30、60min内达吸附平衡。在pH7.0和37℃的生理条件下,两种离子的吸附动力学过程均符合Lagergre方程二级吸附模型,SBP对Ca^(2+)的等温吸附平衡与Langmuir方程拟合度高,属单分子层吸附,而SBP对Pb^(2+)的等温吸附平衡与Langmuir方程拟合度不如Ca^(2+)高。Sugar beet pulp is ion chelating agent and adsorbent. The adsorption properties of the light metal ions of Ca2＋ and heavy metal ions of Pb2＋ by the sugar beet pulp（SBP） were studied under various pH values,adsorption temperature, reaction time and initial concentration of metal ions. Absorption characteristics and mechanisms of Ca2＋ and Pb2＋ on the SBP under the human intestinal environmental conditions in vitro simulation （pH7.0,37℃） were studied. The experimental results indicated that the chelating capacity of Pb2＋ was much higher than that of Ca2＋. The adsorption capacities of metal ions reached an optimum at pH7.0. The time to reach the adsorption equilibrium of Ca2＋ and Pb2＋ was 30,60 rain, respectively. Additionally, under the physiological conditions （pH7. 0, 37℃）, the adsorption kinetics characteristics could be well described using the presudosecond-order kinetic model. Isothermal adsorption equilibrium of SBP on Ca2＋ had higher fitting degree with the Langmuir equation and it was a monolayer adsorption behavior by SBP. However,isothermal adsorption equilibrium of SBP on Pb2＋ had lower fitting degree than Ca2＋ with the Langmuir equation.

关 键 词：甜菜粕 CA2+ PB2+ 吸附机理 

分 类 号：TS249[轻工技术与工程—制糖工程] O647.3[轻工技术与工程—食品科学与工程]