Biosorption of Cr (VI) by Typha angustifolia: mechanism and responses to heavy metal stress.
In this study, Typha angustifolia was proven to have an excellent accumulation ability in high concentrations of wastewater solutions having Cr (VI) concentrations up to 30 mg L(-1) for 20 days (74% of removal efficiency). Synchrotron microfocus micro X-ray fluorescence (μ-XRF) mapping showed that the uptaken Cr was mainly enriched in the outer layer of the roots and a small portion of it was uniformly distributed in the fronds. The total proteins, soluble sugars, and malondialdehyde in T. angustifolia increased when the concentration of Cr (VI) increased from 9 to 30 mg L(-1). Transmission electron microscope (TEM) assay showed that no lignifications were observed when Cr was absorbed by T. angustifolia. It was concluded that T. angustifolia can uptake Cr by means of surface layer absorption and transportation, and alleviate stresses associated with the sorption of Cr (VI) by thickening of cell walls or secretion of chemical substances.
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
Ya-Li
YL
Chen
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China.
Xiao-Qing
XQ
Hong
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
Hui
H
He
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
Hong-Wei
HW
Luo
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
Ting-Ting
TT
Qian
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China.
Ru-Zhong
RZ
Li
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China. Electronic address: jhong@ustc.edu.cn.
Hong
H
Jiang
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China; School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, PR China.
Han-Qing
HQ
Yu
D000327:Adsorption; D001673:Biodegradation, Environmental / Q000187:drug effects; D002857:Chromium / Q000302:isolation & purification*; D007700:Kinetics; D019216:Metals, Heavy / Q000633:toxicity*; D032401:Typhaceae / Q000378:metabolism*
D019216:Metals, Heavy; D002857:Chromium; C074702:chromium hexavalent ion
Biosorption; Heavy metal; Mechanism; Typha angustifolia; μ-XRF mapping