食品与发酵工业 >

2021 , Vol. 47 >Issue 11: 111 - 118

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.025864

研究报告

西番莲果皮可溶性膳食纤维对金属离子的吸附

  • 李晗 ,
  • 马歆芳 ,
  • 范方宇 ,
  • 杨代勇 ,
  • 王振兴 ,
  • 刘云
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  • 1(西南林业大学 林学院,云南 昆明,650224)
    2(西南林业大学 生命科学学院,云南 昆明,650224)
    3(云南省昆明市生产力促进中心,云南 昆明,650224)
硕士研究生(范方宇教授为通讯作者,E-mail:fanfangyu@swfu.edu.cn)

收稿日期: 2020-10-12

  修回日期: 2020-12-02

  网络出版日期: 2021-07-16

基金资助

西南林业大学科研启动金项目;云南省“万人计划”青年拔尖人才专项资助项目(YNWR-QNBJ-2018-046)

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Properties and mechanisms of metallic ion adsorption on soluble dietary fiber from passion fruit peel

  • LI Han ,
  • MA Xinfang ,
  • FAN Fangyu ,
  • YANG Daiyong ,
  • WANG Zhenxing ,
  • LIU Yun
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  • 1(College of Forestry,Southwest Forestry University,Kunming 650224,China)
    2(School of Life Sciences,Southwest Forestry University,Kunming 650224,China)
    3(Kunming Productivity Promotion Center,Kunming 650224,China)

Received date: 2020-10-12

  Revised date: 2020-12-02

  Online published: 2021-07-16

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摘要

该文就西番莲果皮可溶性膳食纤维(passion fruit peel soluble dietary fiber,PSDF)对Cu2+、Pb2+、Cd2+的吸附作用进行了研究,并探讨了PSDF质量、吸附时间、金属离子初始浓度对吸附的影响及其动力学行为。结果表明,PSDF对金属离子的吸附量随PSDF质量增加而减少,吸附率则先增大后趋于平衡。PSDF对Cu2+、Pb2+、Cd2+的吸附均在30 min左右达到饱和状态,在胃中的吸附率分别为32.10%、42.82%、13.30%,平衡吸附量分别为6.206、8.930、2.781 mg/g;肠中吸附率分别为62.87%、66.71%、83.50%,平衡吸附量分别为12.554、13.292、16.352 mg/g。PSDF吸附量分别随金属离子初始浓度增加而增大,吸附率则随初始浓度增加逐渐下降。PSDF在肠中对Cu2+、Pb2+、Cd2+的吸附能力比在胃中相对更好。其吸附过程符合准二级动力学模型,表明吸附速率控制步骤主要为化学吸附,PSDF吸附平衡符合Freundlich等温模型,拟合效果良好。

关键词： 西番莲果皮; 可溶性膳食纤维; 金属离子; 吸附动力学; 等温吸附模型

本文引用格式

李晗 , 马歆芳 , 范方宇 , 杨代勇 , 王振兴 , 刘云 . 西番莲果皮可溶性膳食纤维对金属离子的吸附[J]. 食品与发酵工业, 2021 , 47(11) : 111 -118 . DOI: 10.13995/j.cnki.11-1802/ts.025864

Abstract

This study aimed to evaluate the adsorption capacity and potential adsorption mechanisms of Cu2+, Pb2+, and Cd2+ by passion fruit peel soluble dietary fiber (PSDF). The effects of PSDF dosage, adsorption time and initial metallic ion concentration on the adsorption were investigated through batch adsorption experiments. And the adsorption models were also been established. Experimental results showed that with the increase of PSDF dosage, Cu2+, Pb2+, and Cd2+ adsorption capacities decreased, but the adsorption rate increased first and then tends to keep balance. The appropriate PSDF dosage exhibited good adsorption capacity and the utilization rate of PSDF was improved. Moreover, the PSDF adsorption of Cu2+, Pb2+, and Cd2+ reached saturation state at about 30 min. The equilibrium adsorption capacity of Cu2+, Pb2+, and Cd2+ in gastric environment was 6.206, 8.930, and 2.781 mg/g, respectively. The equilibrium adsorption capacity of Cu2+, Pb2+, and Cd2+ in the intestinal environment was 12.554, 13.292, and 16.352 mg/g, respectively. Under the same additional amount of PSDF, with the increase of Cu2+, Pb2+, and Cd2+ initial concentration, adsorption capacities were increased, but the adsorption rate was decreased. Besides, PSDF showed better adsorption properties for Cu2+, Pb2+, and Cd2+ in the simulated intestinal environment, compared with the gastric environment. Furthermore, the pseudo-second-order kinetic model could be matched with the adsorption behavior over the whole range of the adsorption process, which indicated that the adsorption rate control step was mainly chemical adsorption. Moreover, the adsorption of Cu2+, Pb2+, and Cd2+ by PSDF could be described well by Freundlich isothermal model and the relativities were good.

Key words： passion fruit peel; soluble dietary fiber; metallic ion; adsorption kinetics; isothermal adsorption model

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