TY - JOUR
T1 - Ball-milled magnetite for efficient arsenic decontamination
T2 - Insights into oxidation–adsorption mechanism
AU - Yang, Xiao
AU - Liu, Siyan
AU - Liang, Tao
AU - Yan, Xiulan
AU - Zhang, Yunhui
AU - Zhou, Yaoyu
AU - Sarkar, Binoy
AU - Ok, Yong Sik
N1 - Funding Information:
Y.L. was supported through the National Natural Science Foundation of China (No. U21A2023 and 41571309 ) ; Y.S.O. was supported through a National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIT ) (No. 2021R1A2C2011734 ), and was partly supported by the OJEong Resilience Institute (OJERI) Research Grant from the OJERI, Korea University , Republic of Korea.
Publisher Copyright:
© 2021
PY - 2022/4/5
Y1 - 2022/4/5
N2 - Conventional adsorbents for decontaminating arsenic exhibit low efficacy for the removal of arsenite (As(III)). This study aims to develop a robust As adsorbent from natural magnetite (M0) via a facile ball milling process, and evaluate their performance for decontaminating As(III) and As(V) in water and soil systems. The ball milling process decreased the particle size and crystallinity of M0, resulting in pronounced As removal by the ball-milled magnetite (Mm). Ball milling under air facilitated the formation of Fe-OH and Fe-COOH functional groups on Mm interface, contributing to effective elimination of As(III) and As(V) via hydrogen bonding and complexation mechanisms. Synergistic oxidation effects of hydroxyl and carboxyl groups, and reactive oxygen species (O2·-, and ·OH) on the transformation of As(III) to As(V) during the adsorption were proposed to explain the enhanced As(III) removal by Mm. A short-term soil incubation experiment indicated that the addition of Mm (10 wt%) induced a decrease in the concentration of exchangeable As by 30.25%, and facilitated the transformation of water-soluble As into residual fraction. Ball milling thus is considered as an eco-friendly (chemical-free) and inexpensive (scalable, one-stage process) method for upgrading the performance of natural magnetite towards remediating As, particularly for tackling the highly mobile As(III).
AB - Conventional adsorbents for decontaminating arsenic exhibit low efficacy for the removal of arsenite (As(III)). This study aims to develop a robust As adsorbent from natural magnetite (M0) via a facile ball milling process, and evaluate their performance for decontaminating As(III) and As(V) in water and soil systems. The ball milling process decreased the particle size and crystallinity of M0, resulting in pronounced As removal by the ball-milled magnetite (Mm). Ball milling under air facilitated the formation of Fe-OH and Fe-COOH functional groups on Mm interface, contributing to effective elimination of As(III) and As(V) via hydrogen bonding and complexation mechanisms. Synergistic oxidation effects of hydroxyl and carboxyl groups, and reactive oxygen species (O2·-, and ·OH) on the transformation of As(III) to As(V) during the adsorption were proposed to explain the enhanced As(III) removal by Mm. A short-term soil incubation experiment indicated that the addition of Mm (10 wt%) induced a decrease in the concentration of exchangeable As by 30.25%, and facilitated the transformation of water-soluble As into residual fraction. Ball milling thus is considered as an eco-friendly (chemical-free) and inexpensive (scalable, one-stage process) method for upgrading the performance of natural magnetite towards remediating As, particularly for tackling the highly mobile As(III).
KW - Arsenic
KW - Ball milling
KW - Magnetite
KW - Sustainable environmental engineering
KW - Synergistic oxidation
UR - http://www.scopus.com/inward/record.url?scp=85121919092&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2021.128117
DO - 10.1016/j.jhazmat.2021.128117
M3 - Article
C2 - 34974405
AN - SCOPUS:85121919092
SN - 0304-3894
VL - 427
JO - Journal of hazardous materials
JF - Journal of hazardous materials
M1 - 128117
ER -