Efficient adsorption of dyes from aqueous solution using a novel functionalized magnetic biochar: Synthesis, kinetics, isotherms, adsorption mechanism, and reusability

Xiumin Li; Jinlan Xu; Xianxin Luo; Jingxin Shi

doi:10.1016/j.biortech.2022.127526

Efficient adsorption of dyes from aqueous solution using a novel functionalized magnetic biochar: Synthesis, kinetics, isotherms, adsorption mechanism, and reusability

Bioresour Technol. 2022 Sep:360:127526. doi: 10.1016/j.biortech.2022.127526. Epub 2022 Jun 27.

Authors

Xiumin Li¹, Jinlan Xu², Xianxin Luo³, Jingxin Shi⁴

Affiliations

¹ School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055 Xi'an, Shaanxi, China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, China; Key Laboratory of Environmental Engineering, Shaanxi Province, China.
² School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055 Xi'an, Shaanxi, China; Key Laboratory of Northwest Water Resources, Environment and Ecology, MOE, China; Key Laboratory of Environmental Engineering, Shaanxi Province, China. Electronic address: xujinlan@xauat.edu.cn.
³ College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China; College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. Electronic address: luoxianxin@nchu.edu.cn.
⁴ Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science & Technology, Nanjing 210044, China.

PMID: 35772720
DOI: 10.1016/j.biortech.2022.127526

Abstract

In this study, a novel adsorbent, dodecylbenzene sulfonic acid (DBSA) functionalized magnetic biochar (DBSA-Fe₃O₄@BC), was synthesized and used to efficiently remove dyes from aqueous solution. The results indicated that DBSA-Fe₃O₄@BC exhibited an excellent adsorption capacity for Rhodamine B (RhB), and the maximum adsorption capacity for RhB at 298 K was 367.67 mg/g, which was approximately 2.3-1.2 folds than that of BC, dodecylsulfonic acid functionalized biochar (DSA@BC), DBSA@BC, Fe₃O₄@BC, and DSA-Fe₃O₄@BC. The possible adsorption mechanisms for RhB adsorption by DBSA-Fe₃O₄@BC included pore filling, electrostatic attraction, H bond, and surface complexation. Importantly, structural control presented that the simultaneous introduction of alkyl and phenyl groups significantly enhanced RhB adsorption by DBSA-Fe₃O₄@BC through hydrophobic and π-π interaction. Combined ethanol (EtOH) desorption and H₂O₂ oxidation regeneration, DBSA-Fe₃O₄@BC remained high-performance for RhB adsorption after six cycles (97.44%), indicating its outstanding reusability. In summary, DBSA-Fe₃O₄@BC exhibited a prospective application for dyeing wastewater treatment.

Keywords: Adsorption mechanism; Dodecylbenzene sulfonic acid; Dyeing wastewater; Fe(3)O(4)-biochar; Rhodamine B.

MeSH terms

Adsorption
Charcoal / chemistry
Coloring Agents*
Hydrogen Peroxide
Kinetics
Magnetic Phenomena
Water Pollutants, Chemical* / analysis

Substances

Coloring Agents
Water Pollutants, Chemical
biochar
Charcoal
Hydrogen Peroxide