Solvent-Free Synthesis of Magnetic Sewage Sludge-Derived Biochar for Heavy Metal Removal from Wastewater

Jiayi Tian, Kexin Guo, Yucan Sun, Ruoxi Lin, Tan Chen, Bing Zhang, Yifei Liu and Ting Yang ()
Additional contact information
Jiayi Tian: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Kexin Guo: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Yucan Sun: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Ruoxi Lin: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Tan Chen: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Bing Zhang: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
Yifei Liu: Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China
Ting Yang: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China

IJERPH, 2022, vol. 20, issue 1, 1-16

Abstract: The commonly used two-step and one-pot synthesis methods for producing biochar require the use of iron salt solutions, resulting in the undesirable consequences of energy consumption for dewatering and potential pollution risks. To address this drawback, a magnetic sewage sludge-derived biochar (MSBC-2) was synthesized by a solvent-free method in this study. The pseudo-second-order kinetic model and Langmuir model provided the best fit to the experimental data, implying a monolayered chemisorption process of Pb 2+ , Cd 2+ and Cu 2+ onto MSBC-2. As the reaction temperature increased from 25 °C to 45 °C, the maximum adsorption capacities increased from 113.64 mg·g −1 to 151.52 mg·g −1 for Pb 2+ , from 101.01 mg·g −1 to 109.89 mg·g −1 for Cd 2+ and from 57.80 mg·g −1 to 74.07 mg·g −1 for Cu 2+ , respectively. Thermodynamic parameters (Δ G 0 < 0, Δ S 0 > 0, Δ H 0 > 0) revealed that the adsorption processes of all three metals by MSBC-2 were favourable, spontaneous and endothermic. Surface complexation, cation-π interaction, ion exchange and electrostatic attraction mechanisms were involved in the adsorption of Pb 2+ , Cd 2+ and Cu 2+ onto MSBC-2. Overall, this study will provide a new perspective for the synthesis of magnetic biochar and MSBC-2 shows great potential as an adsorbent for heavy metal removal.

Keywords: magnetic biochar; toxic metals; adsorption performance; kinetics; isotherms; mechanisms (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/20/1/155/pdf (application/pdf)
https://www.mdpi.com/1660-4601/20/1/155/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:20:y:2022:i:1:p:155-:d:1011727

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().