Adsorption of Tetracycline by Shrimp Shell Waste from Aqueous Solutions: Adsorption Isotherm, Kinetics Modeling, and Mechanism

Jing Chang; Zhen Shen; Xiude Hu; Emily Schulman; Chunyue Cui; Qingjie Guo; Hongjing Tian

doi:10.1021/acsomega.9b03781

Adsorption of Tetracycline by Shrimp Shell Waste from Aqueous Solutions: Adsorption Isotherm, Kinetics Modeling, and Mechanism

ACS Omega. 2020 Feb 17;5(7):3467-3477. doi: 10.1021/acsomega.9b03781. eCollection 2020 Feb 25.

Authors

Jing Chang^{1

2}, Zhen Shen¹, Xiude Hu³, Emily Schulman⁴, Chunyue Cui¹, Qingjie Guo⁴, Hongjing Tian²

Affiliations

¹ College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China.
² State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, China.
³ State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China.
⁴ Department of Chemical & Biomolecular Engineering, University of Maryland at College Park, College Park, Maryland 20740, United States.

Abstract

The highly efficient removal of tetracycline (TC) from an aqueous solution was accomplished by using the raw shrimp shell waste (SSW) as an environmentally friendly adsorbent. The SSW without any treatment removed TC more efficiently than the SSW after being treated with HCl and NaOH solutions. The SSW was characterized using nitrogen adsorption-desorption isotherms, scanning electron microscopy alongside energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, a thermogravimetric-derivative thermogravimetry analyzer, and a ζ-potential analyzer. The maximum adsorption capacity of 400 mg/L SSW was 229.98 mg/g for 36 h at 55 °C. Both the Langmuir isotherm model and the pseudo-second-order kinetic model well described the experimental data. According to the values of the Gibbs free energy and enthalpy changes, the TC adsorption by SSW proved to be spontaneous and endothermic. The TC adsorption process was controlled by intraparticle diffusion and liquid film diffusion.