Characterization and mechanism of lead and zinc biosorption by growing Verticillium insectorum J3

Verticillium insectorum J3 was isolated from a local lead-zinc deposit tailing, and its biosorption characteristics and reaction to the toxicities of different Pb(II) and Zn(II) concentrations were investigated. SEM, FTIR, a pH test and a desorption experiment were carried out to identify a possible...

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Published in:PloS one 2018-12, Vol.13 (12), p.e0203859
Main Authors: Feng, Chong-Ling, Li, Jin, Li, Xue, Li, Ke-Lin, Luo, Kun, Liao, Xing-Sheng, Liu, Tao
Format: Article
Language:English
Subjects:
Adsorption
Alkalies
Bioaccumulation
Biodegradation, Environmental
Biology and Life Sciences
Biosorption
Chemical properties
Engineering research
Environmental engineering
Environmental science
Experiments
Fungi
Heavy metals
Lead
Lead - metabolism
Low concentrations
Medicine and Health Sciences
Metal industry wastes
Metals
Metals (Materials)
Microorganisms
Morphology
Mycelia
Mycelium - growth & development
Nitrates
Physical Sciences
Technology
Toxicity
Verticillium
Verticillium - growth & development
Zinc
Zinc - metabolism
Zinc mining
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Summary:Verticillium insectorum J3 was isolated from a local lead-zinc deposit tailing, and its biosorption characteristics and reaction to the toxicities of different Pb(II) and Zn(II) concentrations were investigated. SEM, FTIR, a pH test and a desorption experiment were carried out to identify a possible mechanism. The biosorption of J3 presented an inhibition trend at low concentrations (25-75 mg L-1) and promotion at high concentrations (100-300 mg L-1). J3 absorbed Pb(II) prior to Zn(II) and produced alkaline substances, while mycelial and pellet morphology modifications were important for the removal of Pb(II) and Zn(II) under different stressful conditions (SEM results). Both intracellular accumulation and extracellular absorption may contribute to the removal of Pb(II) at lower concentrations (25-50 mg L-1), although mainly extracellular biosorption occurred at higher concentrations (75-300 mg L-1). However, Zn(II) bioaccumulation occurred at all concentrations assayed. Verticillium insectorum J3 may have evolved active defenses to alleviate the toxicity of heavy metals and proved to be a highly efficient biosorbent, especially for Pb(II) at high concentrations. This study is a useful reference for the development of biotreatment technologies to mitigate heavy metal waste.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0203859