Efficient adsorption of ciprofloxacin using Ga2S3/S-modified biochar via the high-temperature sulfurization

Xiaogang Zheng; Xinyue He; Hao Peng; Jing Wen; Sihao Lv

doi:10.1016/j.biortech.2021.125238

Efficient adsorption of ciprofloxacin using Ga₂S₃/S-modified biochar via the high-temperature sulfurization

Bioresour Technol. 2021 Aug:334:125238. doi: 10.1016/j.biortech.2021.125238. Epub 2021 Apr 30.

Authors

Xiaogang Zheng¹, Xinyue He², Hao Peng³, Jing Wen⁴, Sihao Lv⁵

Affiliations

¹ College of Chemistry and Chemical Engineering, Key Laboratory of Sichuan Province for Fishes Conservation and Utilization in the Upper Reaches of the Yangtze River, Neijiang Normal University, Neijiang Sichuan 641100, China; Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan Guangdong 523808, China.
² College of Chemistry and Chemical Engineering, Key Laboratory of Sichuan Province for Fishes Conservation and Utilization in the Upper Reaches of the Yangtze River, Neijiang Normal University, Neijiang Sichuan 641100, China.
³ College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China. Electronic address: cqupenghao@126.com.
⁴ Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Province Key Laboratory of Resources and Chemistry of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining Qinghai 810008, China.
⁵ Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan Guangdong 523808, China.

PMID: 33962160
DOI: 10.1016/j.biortech.2021.125238

Abstract

Ga₂S₃ and sulfur co-modified biochar (Ga/S-BC) composites were prepared for enhancing the adsorption of ciprofloxacin from sugarcane bagasse via the high-temperature sulfurization. In contrast with sulfur-modified biochar, Ga/S-BC exhibited the better adsorption capacity for ciprofloxacin removal. The increasing Ga content induced to the climbing and then declining adsorption activity of Ga/S-BC. Among these obtained Ga/S-BC composites, optimal 3-Ga/S-BC with a Ga content of 7.40% and surface area of 681.67 m² g^-1 exhibited the superior capacity of 330.21 mg g^-1. The adsorption capacity of 3-Ga/S-BC declined to 301.66 mg g^-1 after nine cycles. pH and inorganic salts also affected the adsorption capacity of 3-Ga/S-BC for ciprofloxacin removal. The adsorption isotherms of obtained Ga/S-BC composites were well described by Langmuir isotherm, and their adsorption kinetics were well estimated via second-order model. The adsorption performance of 3-Ga/S-BC in ciprofloxacin removal was a physisorption and spontaneous process.

Keywords: Adsorption; Ciprofloxacin; Ga(2)S(3)/S-modified biochar; High-temperature sulfurization; Sugarcane bagasse.