Geopolymerization enhanced hydrothermal synthesis of analcime from steel slag and CFBC fly ash and heavy metal adsorption on analcime. Issue 14 (19th June 2020)

• Record Type: Journal Article
• Authors: Liu, Ze; Li, Li; Shao, Ningning; Hu, Tao; Han, Le; Wang, Dongmin
• Is Part Of: Environmental technology. Volume 41:Issue 14(2020)
• Page Start: 1753
• Page End: 1765
• Publication Date: 2020-06-19
• Subjects: Steel slag -- circulating fluidized bed combustion fly ash -- geopolymerization -- analcime -- heavy metal ions; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2018.1545805
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: This work is focused on crystal phase transition of solid wastes and functional application of crystal analcime in waste water purification, which provide a new environment-friendly route. In this paper, analcime was synthesized from steel slag and Circulating fluidized bed combustion (CFBC) fly ash (CFA) by hydrothermal method enhanced via geopolymerization (non-crystallized process). Then the analcimes were used for the removal of heavy metal ions (Pb 2+, Cu 2+ ) in aqueous solutions. Both the raw materials and products were characterized by XRF, XRD, FT-IR, SEM-EDS, and TEM. The results showed that non-crystallized process reduced the time of hydrothermal reaction and promoted the purity of analcime. The adsorption kinetics of analcime were all well fitted the pseudo-second-order model, and adsorption isotherms were well described by the Langmuir model. The maximum adsorption capacity of analcime for Pb 2+ and Cu 2+ were around 75.76, and 21.83 mg/g, respectively. The preference order observed for adsorption is Pb 2+ > Cu 2+ . GRAPHICAL ABSTRACT: