Effects of different precursors on the structure of lignin-based biochar and its ability to adsorb benzopyrene from sesame oil

Shuai Xu; Jing-Yang Yuan; Ya-Ting Zhang; Qiao-Li Yang; Chen-Xia Zhang; Qing Guo; Zhao Qin; Hua-Min Liu; Xue-De Wang; Hong-Xian Mei; Ying-Hui Duan

doi:10.1016/j.ijbiomac.2024.132216

Effects of different precursors on the structure of lignin-based biochar and its ability to adsorb benzopyrene from sesame oil

Int J Biol Macromol. 2024 May 8;269(Pt 2):132216. doi: 10.1016/j.ijbiomac.2024.132216. Online ahead of print.

Authors

Shuai Xu¹, Jing-Yang Yuan², Ya-Ting Zhang³, Qiao-Li Yang¹, Chen-Xia Zhang¹, Qing Guo¹, Zhao Qin⁴, Hua-Min Liu⁵, Xue-De Wang¹, Hong-Xian Mei⁶, Ying-Hui Duan⁶

Affiliations

¹ College of Food Science and Engineering & Institute of Special Oilseed Processing and Technology, Henan University of Technology, Zhengzhou 450001, China.
² College of International Education, Henan University of Technology, Zhengzhou 450001, China.
³ College of Food Science and Engineering & Institute of Special Oilseed Processing and Technology, Henan University of Technology, Zhengzhou 450001, China; Zhengzhou University, Zhengzhou 450001, China.
⁴ College of Food Science and Engineering & Institute of Special Oilseed Processing and Technology, Henan University of Technology, Zhengzhou 450001, China. Electronic address: qinzhao505@163.com.
⁵ College of Food Science and Engineering & Institute of Special Oilseed Processing and Technology, Henan University of Technology, Zhengzhou 450001, China. Electronic address: liuhuamin5108@163.com.
⁶ Henan Sesame Research Center, Henan Academy of Agricultural Sciences, Zhengzhou 450008, China.

PMID: 38729483
DOI: 10.1016/j.ijbiomac.2024.132216

Abstract

Agricultural by-products of sesame are promising bioresources in food processing. This study extracted lignin from the by-products of sesame oil production, namely, the capsules and straw of black and white sesame. Using acid, alkali, and ethanol methods, 12 distinct lignins were obtained to prepare biochar, aiming to investigate both the structural characteristics of lignin-based biochar (LBB) and its ability to remove benzo[a]pyrene (BaP) from sesame oil. The results showed that white sesame straw was the most suitable raw material for preparing biochar. In terms of the preparation method, acid-extracted lignin biochar was more effective in removing BaP than alkaline or ethanol methods. Notably, WS-1LB (white sesame straw acid-extracted lignin biochar) exhibited the highest BaP adsorption efficiency (91.44 %) and the maximum specific surface area (1065.8187 m²/g), characterized by porous structures. The pseudo 2^nd and Freundlich models were found to be the best fit for the adsorption kinetics and isotherms of BaP on LBB, respectively, suggesting that a multilayer adsorption process was dominant. The high adsorption of LBB mainly resulted from pore filling. This study provides an economical and highly efficient biochar adsorbent for the removal of BaP in oil.

Keywords: Benzo(a)pyrene adsorption; Lignin-based biochar; Sesame oil.