Removal of heavy metals from aqueous solutions by high performance capacitive deionization process using biochar derived from Sargassum hemiphyllum

Quoc-Minh Truong; Thanh-Binh Nguyen; Wei-Hsin Chen; Chiu-Wen Chen; Anil Kumar Patel; Xuan-Thanh Bui; Reeta Rani Singhania; Cheng-Di Dong

doi:10.1016/j.biortech.2022.128524

Removal of heavy metals from aqueous solutions by high performance capacitive deionization process using biochar derived from Sargassum hemiphyllum

Bioresour Technol. 2023 Feb:370:128524. doi: 10.1016/j.biortech.2022.128524. Epub 2022 Dec 23.

Authors

Quoc-Minh Truong¹, Thanh-Binh Nguyen², Wei-Hsin Chen³, Chiu-Wen Chen⁴, Anil Kumar Patel⁴, Xuan-Thanh Bui⁵, Reeta Rani Singhania⁴, Cheng-Di Dong⁶

Affiliations

¹ Institute of Aquatic Science and Technology, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan; Faculty of Management Science, Thu Dau Mot University, Binh Duong 75000, Viet Nam.
² Institute of Aquatic Science and Technology, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan.
³ Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan; Research Center for Smart Sustainable Circular Economy, Tunghai University, Taichung 407, Taiwan; Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan.
⁴ Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan.
⁵ Key Laboratory of Advanced Waste Treatment Technology, Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh (VNU-HCM), Thu Duc City, Ho Chi Minh City 700000, Viet Nam; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 700000, Viet Nam.
⁶ Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan. Electronic address: cddong@nkust.edu.tw.

PMID: 36572160
DOI: 10.1016/j.biortech.2022.128524

Abstract

Capacitive deionization (CDI) has been considered as an efficient, energy-saving and environmental friendly technology for water treatment. For the practical application of CDI, high-performance electrode materials beyond standard activated carbon should be developed. In this study, biochar derived from brown algae Sargassum hemiphyllum prepared by pyrolysis at 300-700 °C and then used as the CDI electrode to remove Cu(II) from aqueous solutions. According to the findings, the optimal pyrolysis temperature was 700 °C, and the electrosorption capacity of BAB700 was 75-120 mg·g^-1 at an applied voltage of 1.2 V across wide range of initial pH, temperatures and ion types. Moreover, BAB700 also exhibited outstanding ability to electrosorb other heavy metals (Zn(II), Ni(II), and Cd(II)). In addition, the BAB700 retained the Cu(II) removal efficiency of 70 % in 10 cycles. Cu(II) in actual water is completely eliminated with great reproducibility, resulting in a high degree of applicability for water treatment.

Keywords: Biochar; Brown algae; Capacitive deionization (CDI); Cu (II); Electrosorption.

MeSH terms

Charcoal
Electrodes
Metals, Heavy*
Reproducibility of Results
Sargassum*
Water Purification* / methods

Substances

biochar
Charcoal
Metals, Heavy