Engineering of zeolitic imidazolate frameworks based on magnetic three-dimensional graphene as effective and reusable adsorbent to enhance the adsorption and removal of caffeine from tea samples

Yuwei Hua; Guangyang Liu; Zhihao Lin; Zhou Jie; Chenxi Zhao; Jiatong Han; Ge Chen; Linyun Li; Xiaodong Huang; Zhongxiao Liu; Jun Lv; Donghui Xu

doi:10.1016/j.foodchem.2023.137143

Engineering of zeolitic imidazolate frameworks based on magnetic three-dimensional graphene as effective and reusable adsorbent to enhance the adsorption and removal of caffeine from tea samples

Food Chem. 2024 Jan 15:431:137143. doi: 10.1016/j.foodchem.2023.137143. Epub 2023 Aug 19.

Authors

Yuwei Hua¹, Guangyang Liu², Zhihao Lin¹, Zhou Jie¹, Chenxi Zhao³, Jiatong Han¹, Ge Chen¹, Linyun Li¹, Xiaodong Huang¹, Zhongxiao Liu¹, Jun Lv¹, Donghui Xu⁴

Affiliations

¹ State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Vegetables Quality and Safety Control, Ministry of Agriculture and Rural Affairs of China, Beijing 100081, China.
² State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Vegetables Quality and Safety Control, Ministry of Agriculture and Rural Affairs of China, Beijing 100081, China. Electronic address: liuguangyang@caas.cn.
³ College of Horticulture, Northeast Agricultural University, Harbin 150030, PR China.
⁴ State Key Laboratory of Vegetable Biobreeding, Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Vegetables Quality and Safety Control, Ministry of Agriculture and Rural Affairs of China, Beijing 100081, China. Electronic address: xudonghui@caas.cn.

PMID: 37604003
DOI: 10.1016/j.foodchem.2023.137143

Abstract

As more and more adverse health effects of caffeine are being discovered, decaffeinated drinks are receiving increasing attention. In this work, a magnetic imidazole zeolite backbone compounded with three-dimensional graphene was successfully synthesized as a solid adsorbent using a layer-by-layer self-assembly technique, which can rapidly and effectively adsorb caffeine from tea. Meanwhile, the structure and properties of caffeine in tea were investigated by various physicochemical characterization tools. The analytical data showed that Fe₃O₄@3DGA@ZIF-8 had a specific surface area of 162.9754 m²/g and an adsorption capacity of up to 19.57 mg/g with a maximum adsorption rate of 96.55%, which could be maintained with good adsorption repeated utilization three times. The adsorption isotherm and the adsorption kinetic better fit with the Langmuir model and the preudo-second order kinetic model, respectively. Therefore, Fe₃O₄@3DGA@ZIF-8 is a good magnetic adsorbent for the separation and the effective removal of caffeine from tea sample.

Keywords: 3D graphene; Adsorption and removal; Caffeine; Fe(3)O(4)@3DGA@ZIF-8; ZIFs.

MeSH terms

Adsorption
Caffeine
Graphite*
Magnetic Phenomena
Tea
Zeolites*

Substances

Caffeine
Graphite
Zeolites
Tea