摘要
以菠萝蜜果皮为原料,经粉碎制成粉末吸附剂。探究了菠萝蜜果皮吸附亚甲基蓝的性能。结果表明,在100 mL 100 mg/L的亚甲基蓝溶液中,菠萝蜜果皮最佳投加量为0.8 g,pH为5、温度为25℃、震荡时间为40 min。利用准一级、准二级动力学方程模拟菠萝蜜果皮吸附亚甲基蓝的动力学过程,利用Freundlich和Langmuir方程模拟其热力学行为。结果表明菠萝蜜果皮吸附亚甲基蓝的过程适合于准二级动力学、Freundlich模型。文中计算了焓变(ΔH^0)、自由能(ΔG^0)、熵变(ΔS^0)等热力学参数,菠萝蜜果皮吸附亚甲基蓝的ΔG^0小于0,ΔS^0小于0、ΔH^0小于0,说明菠萝蜜果皮吸附亚甲基蓝的过程是一个自发的趋于有序的放热过程。通过对吸附亚甲基蓝染料前后菠萝蜜果皮材料表面形貌进行分析,发现亚甲基蓝染料填充了菠萝蜜果皮表面的的空隙,导致吸附前后菠萝蜜的表面形貌发生了变化。
This paper mainly focuses on the absorptive properties of Jackfruit Peel on methylene Blue. The raw jackfruit peel was prepared as adsorbent powder by crush. It showed that the optimal adsorption conditions in 100 mL 100 mg/L methylene solution were as follow:The dosage of jackfruit peel powder at 0.8 g was perfect condition with the pH5, the temperature 25 ℃,and the shaking time 40 minutes. The quasi-first-order and quasi-second-order kinetic equations were used to simulate the kinetics process of the adsorption of methylene blue on the jackfruit peel,and the Freundlich and Langmuir equations were used to simulated the thermodynamic behavior. The results also showed that the pseudo-second kinetic equation and the Freundlich equa-tion were suitable for describing of the whole adsorption process. The thermodynamic parameters of Gibbs free energy(ΔG^0), enthalpy(ΔH^0)and entropy change(ΔS^0)were calculated and results were as follow:In the process of Jackfruit Peel powder adsorption of methylene blue,the value of ΔG^0,ΔS^0,and ΔH^0 were kept as:ΔG^0<0,ΔH^0<0 and ΔS^0<0,which indicated that it was a spontaneous,orderly and exothermic process. The surface of the jackfruit peel were analyzed both before and after the process of adsorption. It found that the surface of the jackfruit peel was filled by methylene blue,which was resulted in the shape changing.
作者
杨新周
YANG Xin-zhou(Dehong Teachers College,Science and Engineering Department,Dehong 678400,China;The Research Institute of Ethnic Minority Medicine,Dehong Teachers’College,Dehong 678400,China)
出处
《食品工业科技》
CAS
北大核心
2019年第12期65-69,76,共6页
Science and Technology of Food Industry
基金
云南省应用基础研究青年项目(2018FD099)
民族药资源化学国家民族事务委员会-教育部重点实验室开放基金(MZY1602)
云南省教育厅基金资助项目(2017ZZX277)
德宏州科技创新计划项目(2017-5)
德宏师范高等专科学校优秀中青年教师学术带头人培养项目(2016-2018)
关键词
菠萝蜜果皮
亚甲基蓝
吸附
动力学
热力学
表面形貌
jackfruit peel
methylene blue
adsorption
dynamic
thermodynamic
surface morphology
