Enhanced Absorption of Hg2+ by a Recyclable Thiol-Functionalized Salix Psammophila

To solve the heavy metal water contamination problem of mercury ions, salix psammophila (SPP) powder was functionalized by thiol to prepare a novel adsorbent (TSPP). The materials were characterized by scanning electron microscope (SEM), Fourier-transform infrared (FTIR), energy-dispersive spectrosc...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2022, Vol.233 (1), Article 13
Main Authors: Shi, Qi, Yang, Xinglin, Zhao, Baiyun, Liu, Ze, Liu, Yanrong, Liu, Xiaokai, Wang, Li
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Analytical methods
Atmospheric Protection/Air Quality Control/Air Pollution
Chelation
Climate Change/Climate Change Impacts
Contamination
Earth and Environmental Science
Electron transfer
Environment
Environmental monitoring
Fourier transforms
Functional groups
Heavy metals
Hydrogeology
Infrared spectroscopy
Ion exchange
Mercury
Mercury (metal)
Metals
Oxidoreductions
Photoelectron spectroscopy
Photoelectrons
Scanning electron microscopy
Soil Science & Conservation
Spectroscopy
Spectrum analysis
Thermogravimetry
Water pollution
Water Quality/Water Pollution
Willow
X ray photoelectron spectroscopy
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Summary:To solve the heavy metal water contamination problem of mercury ions, salix psammophila (SPP) powder was functionalized by thiol to prepare a novel adsorbent (TSPP). The materials were characterized by scanning electron microscope (SEM), Fourier-transform infrared (FTIR), energy-dispersive spectroscopy (EDS), thermogravimetry (TG), and X-ray photoelectron spectroscopy (XPS). The maximum adsorption capacity of TSPP was 1615.1 mgg −1 in 60 min (pH = 2, temperature 45 ℃, Hg 2+ concentration = 700 mgL −1 ). The adsorption of Hg 2+ by TSPP conforms to the pseudo-secondary kinetic model and Langmuir isotherm model. The adsorption process of Hg 2+ mainly includes ion exchange of -COOH, electrostatic attraction of -NH − , electron transfer of -NH 2 , and chelation of sulfhydryl group and other functional groups. In addition, TSPP still has a high adsorption capacity of 1547.5 mgg −1 after four recycling times, indicating that it can be used as a low-cost, high-economy, and environmentally friendly adsorbent.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-021-05408-5