An impressive pristine biochar from food waste digestate for arsenic(V) removal from water: Performance, optimization, and mechanism

Jingxin Liu; Hang Jia; Zelin Xu; Teng Wang; Meng Mei; Si Chen; Jinping Li; Wenjuan Zhang

doi:10.1016/j.biortech.2023.129586

An impressive pristine biochar from food waste digestate for arsenic(V) removal from water: Performance, optimization, and mechanism

Bioresour Technol. 2023 Nov:387:129586. doi: 10.1016/j.biortech.2023.129586. Epub 2023 Jul 28.

Authors

Jingxin Liu¹, Hang Jia², Zelin Xu³, Teng Wang¹, Meng Mei¹, Si Chen¹, Jinping Li¹, Wenjuan Zhang⁴

Affiliations

¹ School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China; Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan Textile University, Wuhan 430073, China.
² Beijing Graphene Institute, Beijing 100095, China.
³ School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
⁴ School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China. Electronic address: zwjuan1109@163.com.

PMID: 37516138
DOI: 10.1016/j.biortech.2023.129586

Abstract

Anaerobic digestion has become a global practice for valorizing food waste, but the recycling of the digestate (FWD) remains challenging. This study aimed to address this issue by utilizing FWD as a low-cost feedstock for Ca-rich biochar production. The results demonstrated that biochar pyrolyzed at 900 °C exhibited impressive As(V) adsorption performance without any modifications. Kinetic analysis suggested As(V) was chemisorbed onto CDBC9, while isotherm data conformed well to Langmuir model, indicating monolayer adsorption with a maximum capacity of 76.764 mg/g. Further analysis using response surface methodology revealed that pH value and adsorbent dosage were significant influencing factors, and density functional theory (DFT) calculation visualized the formation of ionic bonds between HAsO₄^2- and CaO(110) and Ca(OH)₂(101) surfaces. This work demonstrated the potential of using FWD for producing Ca-rich biochar, providing an effective solution for As(V) removal and highlighting the importance of waste material utilization in sustainable environmental remediation.

Keywords: Adsorption; As(Ⅴ) removal; DFT calculation; Food waste digestate; Pristine Ca-rich biochar.

MeSH terms

Adsorption
Arsenic* / chemistry
Charcoal / chemistry
Food
Kinetics
Refuse Disposal*
Water
Water Pollutants, Chemical* / chemistry

Substances

Arsenic
biochar
Water
Water Pollutants, Chemical
Charcoal