Enhanced adsorption of Congo red using chitin suspension after sonoenzymolysis

Furong Hou; Danli Wang; Xiaobin Ma; Lihua Fan; Tian Ding; Xingqian Ye; Donghong Liu

doi:10.1016/j.ultsonch.2020.105327

Enhanced adsorption of Congo red using chitin suspension after sonoenzymolysis

Ultrason Sonochem. 2021 Jan:70:105327. doi: 10.1016/j.ultsonch.2020.105327. Epub 2020 Sep 1.

Authors

Furong Hou¹, Danli Wang², Xiaobin Ma³, Lihua Fan¹, Tian Ding⁴, Xingqian Ye⁵, Donghong Liu⁶

Affiliations

¹ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
² College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China. Electronic address: danliwang@zju.edu.cn.
³ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China. Electronic address: xbma@zju.edu.cn.
⁴ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R&D Center for Food Technology and Equipment, Hangzhou 310058, China.
⁵ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; Fuli Institute of Food Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R&D Center for Food Technology and Equipment, Hangzhou 310058, China. Electronic address: psu@zju.edu.cn.
⁶ College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; Fuli Institute of Food Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Key Laboratory for Agro-Food Processing, Zhejiang R&D Center for Food Technology and Equipment, Hangzhou 310058, China. Electronic address: dhliu@zju.edu.cn.

Abstract

In the present work, chitin suspensions after enzymolysis and sonoenzymolysis were taken as adsorbents to evaluate the adsorption properties of Congo red (CR) dyes. Compared with untreated chitin suspension, the CR adsorption performance was significantly improved after enzymolysis and even more after sonoenzymolysis. According to different adsorption kinetic and isotherm models, Langmuir isotherm and the pseudo-second order model were more reliable to describe the adsorption process of CR onto different chitin samples and demonstrated a monolayer and favorable physisorption process. What's more, negative values of ΔG (Gibbs free energy change) and the shifts to higher negative values with the temperature increasing from adsorption thermodynamic study proved a spontaneous CR adsorption process. The structural characterization before and after adsorption further verified the physical adsorption between chitin and CR, and a larger specific area and higher porosity of chitin suspension was obtained after sonoenzymolysis with more available active sites.

Keywords: Adsorption properties; Chitin suspension; Congo red; Sonoenzymolysis.

MeSH terms

Adsorption
Chitin / chemistry*
Congo Red / chemistry*
Enzymes / chemistry*
Porosity
Proteolysis
Sonication / methods*
Thermodynamics

Substances

Enzymes
Chitin
Congo Red