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Adsorption-pyrolysis technology for recovering heavy metals in solution using contaminated biomass phytoremediation

Han, Ziyu ; Guo, Zhaohui ; Zhang, Yong ; Xiao, Xiyuan ; Xu, Zhi ; Sun, Yang

Resources, Conservation & Recycling, February 2018, Vol.129, pp.20-26 [Tạp chí có phản biện]

ISSN: 0921-3449 ; DOI: 10.1016/j.resconrec.2017.10.003

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  • Nhan đề:
    Adsorption-pyrolysis technology for recovering heavy metals in solution using contaminated biomass phytoremediation
  • Tác giả: Han, Ziyu ; Guo, Zhaohui ; Zhang, Yong ; Xiao, Xiyuan ; Xu, Zhi ; Sun, Yang
  • Chủ đề: Phytoremediating Biomass ; Adsorption ; Pyrolysis ; Cadmium ; Copper ; Bio-Ore
  • Là 1 phần của: Resources, Conservation & Recycling, February 2018, Vol.129, pp.20-26
  • Mô tả: •Adsorption-pyrolysis technology by phytoremediation biomass was proposed for recovery the heavy metals Cd and Cu from soil and solution.•Heavy metals in the biomass were mainly retained in the solid products after pyrolysis and the content of heavy metals was more than 6.58wt%.•Compare with Cu, Cd in biomass was more volatilized under 950°C while both of them can be recovered under 450°C. Feasibility of adsorption-pyrolysis technology to recover metals from solution using contaminated biomass phytoremediation was discussed. The technology can meet three objectives: the disposal of metals-contaminated biomass from phytoremediation, the adsorption of metals from wastewater and the reuse of metals-saturated biomass. In this study, the recovery of Cd and Cu in metals-containing solution from contaminated biomass of phytoremediation was achieved through adsorption and pyrolysis technology. The results showed that pH value of the metals-containing solution and the pyrolysis temperature for metals concentration are the key factors of the novel technology. When the pH of the metals-containing solution was 6, the content of Cd and Cu in the saturated biomass after approximately 30min adsorption was 2.7wt% and 1.25wt%. Next, the saturated biomass is pyrolyzed at 450°C, and the final content of Cd and Cu in the solid phase product was 7.13wt% and 6.58wt%, respectively. The concentration of metals from the adsorption-pyrolysis process for bio-ore was primarily due to the redox reaction of Cd and Cu salts and the volatilizing properties of elements. The results suggested that the adsorption-pyrolysis technology is feasible for recovery of Cd and Cu in solution.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0921-3449 ; DOI: 10.1016/j.resconrec.2017.10.003

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