TY - JOUR
T1 - In situ stabilization of arsenic in soil with organoclay, organozeolite, birnessite, goethite and lanthanum-doped magnetic biochar
AU - BAGHERIFAM, Saeed
AU - BROWN, Trevor C.
AU - FELLOWS, Christopher M.
AU - NAIDU, Ravi
AU - KOMARNENI, Sridhar
N1 - Funding Information:
The author Saeed Bagherifam gratefully thanks the University of New England and the Australian government for providing scholarships for his Ph.D. program. We thank the Environmental Analysis Laboratory of the Southern Cross University, Australia for assisting in characterization of soil samples and analysis of soil extracts and Mr. Malcolm Lambert for technical assistance in SEM analysis.
Publisher Copyright:
© 2022 Soil Science Society of China
PY - 2022/10
Y1 - 2022/10
N2 - Arsenic (As) is a known carcinogen and naturally occurring semi-metal in soils and in the Earth's crust. Contamination of soils and water with As poses a serious threat to millions of people worldwide due to its health hazards and toxicological properties. Hence, devising novel and efficient methods for remediation of contaminated areas has attracted a great deal of interest across the globe. In this study, we investigated the usefulness of synthetic birnessite, goethite, hexadecylpyridinium chloride-modified montmorillonite (HDPC-M), hexadecylpyridinium bromide-modified zeolite (HDPB-Z), and lanthanum (La)-doped magnetic biochar produced from eucalyptus bark (La-Euchar) as adsorbents at 10% dosage for As stabilization in a soil spiked with 1 000 mg kg-1 As. The effectiveness of the above adsorbents in As immobilization in soil was assessed using single-step extractions with 2 mol L-1 HNO3 and deionized water, the simplified bioaccessibility extraction test (SBET) method, and sequential extraction with the modified Community Bureau of Reference (BCR) method. Application of the adsorbents shifted the exchangeable fraction of As to more recalcitrant fractions and dramatically reduced the exchangeable fraction by 6%–99% and the extractable amounts with HNO3, deionized water, and SBET method by 30%–92%, 17%–95%, and 12%–90%, respectively, compared to the unamended control. The immobilizing effects of adsorbents on As decreased in the sequence of birnessite >La-Euchar >goethite >HDPB-Z >HDPC-M. Birnessite exhibited great affinity for As and drastically reduced As extractability by more than 90% in all single extractions. The results revealed that HDPC-M, HDPB-Z, La-Euchar, birnessite, and goethite are promising immobilizing agents for in situ stabilization of As in terrestrial environments.
AB - Arsenic (As) is a known carcinogen and naturally occurring semi-metal in soils and in the Earth's crust. Contamination of soils and water with As poses a serious threat to millions of people worldwide due to its health hazards and toxicological properties. Hence, devising novel and efficient methods for remediation of contaminated areas has attracted a great deal of interest across the globe. In this study, we investigated the usefulness of synthetic birnessite, goethite, hexadecylpyridinium chloride-modified montmorillonite (HDPC-M), hexadecylpyridinium bromide-modified zeolite (HDPB-Z), and lanthanum (La)-doped magnetic biochar produced from eucalyptus bark (La-Euchar) as adsorbents at 10% dosage for As stabilization in a soil spiked with 1 000 mg kg-1 As. The effectiveness of the above adsorbents in As immobilization in soil was assessed using single-step extractions with 2 mol L-1 HNO3 and deionized water, the simplified bioaccessibility extraction test (SBET) method, and sequential extraction with the modified Community Bureau of Reference (BCR) method. Application of the adsorbents shifted the exchangeable fraction of As to more recalcitrant fractions and dramatically reduced the exchangeable fraction by 6%–99% and the extractable amounts with HNO3, deionized water, and SBET method by 30%–92%, 17%–95%, and 12%–90%, respectively, compared to the unamended control. The immobilizing effects of adsorbents on As decreased in the sequence of birnessite >La-Euchar >goethite >HDPB-Z >HDPC-M. Birnessite exhibited great affinity for As and drastically reduced As extractability by more than 90% in all single extractions. The results revealed that HDPC-M, HDPB-Z, La-Euchar, birnessite, and goethite are promising immobilizing agents for in situ stabilization of As in terrestrial environments.
UR - http://www.scopus.com/inward/record.url?scp=85136252701&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85136252701&partnerID=8YFLogxK
U2 - 10.1016/j.pedsph.2022.06.008
DO - 10.1016/j.pedsph.2022.06.008
M3 - Article
AN - SCOPUS:85136252701
SN - 1002-0160
VL - 32
SP - 764
EP - 776
JO - Pedosphere
JF - Pedosphere
IS - 5
ER -