Manganese enhances the immobilization of trace cadmium from irrigation water in biological soil crust

TY - JOUR

T1 - Manganese enhances the immobilization of trace cadmium from irrigation water in biological soil crust

AU - Peng, Liang

AU - Deng, Xiaozhou

AU - Song, Huijuan

AU - Tan, Xiaoke

AU - Gu, Ji dong

AU - Luo, Si

AU - Lei, Ming

N1 - Publisher Copyright: © 2018 Elsevier Inc.

PY - 2019/1/30

Y1 - 2019/1/30

N2 - The effect of biological soil crust (BSC) in paddy field on the immobilization and removal of heavy metal from irrigation water is an important issue. BSC was cultured in solutions with different concentrations of manganese (Mn) salt and cadmium (Cd) sulfate for 15 days. We analyzed the Mn, Cd and Fe contents in the BSC and investigated the effects of Mn salt on the Cd distribution in different binding-forms in BSC as well. The results show that Mn salt was effective at enabling BSC to immobilize the Cd, and its removal efficiency from irrigation water improved with an increase in the Mn concentration used. The removal of 50.00 μg/L of Cd from irrigation water by BSC reached as high as 95.70% in present of 20.00 mg/L Mn. The highest obtained biological concentrated factor of BSC for Cd is ~2.7 × 104. The mainly Cd species (75%) in BSC is the non-EDTA extracted minerals. Based on the SEM-EDS and XPS analyses, it was reasonably inferred that the Mn ion was oxidized by Mn oxidizing bacteria (MOB), to yield the porous spongy-like birnessite with d-spacing of 2.31 Ǻ while Cd was scavenged and immobilized in the crystal lattice. The MOB was identified as Bacillus. This study provides a potentially novel method to decontaminate irrigation water polluted with Cd by using BSC in presence of Mn.

AB - The effect of biological soil crust (BSC) in paddy field on the immobilization and removal of heavy metal from irrigation water is an important issue. BSC was cultured in solutions with different concentrations of manganese (Mn) salt and cadmium (Cd) sulfate for 15 days. We analyzed the Mn, Cd and Fe contents in the BSC and investigated the effects of Mn salt on the Cd distribution in different binding-forms in BSC as well. The results show that Mn salt was effective at enabling BSC to immobilize the Cd, and its removal efficiency from irrigation water improved with an increase in the Mn concentration used. The removal of 50.00 μg/L of Cd from irrigation water by BSC reached as high as 95.70% in present of 20.00 mg/L Mn. The highest obtained biological concentrated factor of BSC for Cd is ~2.7 × 104. The mainly Cd species (75%) in BSC is the non-EDTA extracted minerals. Based on the SEM-EDS and XPS analyses, it was reasonably inferred that the Mn ion was oxidized by Mn oxidizing bacteria (MOB), to yield the porous spongy-like birnessite with d-spacing of 2.31 Ǻ while Cd was scavenged and immobilized in the crystal lattice. The MOB was identified as Bacillus. This study provides a potentially novel method to decontaminate irrigation water polluted with Cd by using BSC in presence of Mn.

KW - Biological soil crust

KW - Biomineral

KW - Heavy metal

KW - Paddy

UR - http://www.scopus.com/inward/record.url?scp=85055908352&partnerID=8YFLogxK

U2 - 10.1016/j.ecoenv.2018.10.087

DO - 10.1016/j.ecoenv.2018.10.087

M3 - 文章

C2 - 30396133

AN - SCOPUS:85055908352

SN - 0147-6513

VL - 168

SP - 369

EP - 377

JO - Ecotoxicology and Environmental Safety

JF - Ecotoxicology and Environmental Safety

ER -