Engelhard titanosilicate-1 and Engelhard titanosilicate-2 as promising adsorbents in multivalence heavy metal removal. Issue 2 (June 2015)

• Record Type: Journal Article
• Authors: Liu, Huimin; Sano, Makoto; Suzuki, Toshimitsu; Kakutani, Yuki; Adachi, Yu; Miyake, Takanori
• Is Part Of: Journal of environmental chemical engineering. Volume 3:Issue 2(2015:Jun.)
• Page Start: 1081
• Page End: 1087
• Publication Date: 2015-06
• Subjects: ETS-1 -- ETS-2 -- Heavy metal removal; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2015.04.023
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: ETS-1 and ETS-2 were effective in the removal of mono-, di- and tri-valence cation. Existing states of tetra-, penta-valence cation were accounted for their low removal performance. ETS-1 showed a special affinity in Ag + uptake. Abstract: Engelhard titanosilicate-1 (ETS-1), Engelhard titanosilicate-2 (ETS-2) and mesoporous manganese oxide (Meso-Mn) were synthesized, and ETS-1 and ETS-2 were firstly employed in the removal of a series of heavy metals with different valences. Characterization revealed successful synthesis of ETS-1 and ETS-2, with specific surface areas of about 120 and 220 m 2 /g, respectively. The exchange capacities for monovalent cation were calculated to be 6.70 and 8.12 mmol/g, respectively. ETS-1 and ETS-2 exhibited better performance in the removal of monovalent Ag +, divalent Cu 2+, and trivalent Y 3+ and La 3+ . The amounts of Ag + uptake were 3.45 and 3.64 mmol/g over ETS-1 and ETS-2 respectively, with ETS-1 showing a special affinity to Ag + uptake. The maximum uptake over ETS-1 and ETS-2 were 1.41–1.52, 1.82 mmol/g for divalent cations, and 0.78–0.84, 1.16–1.20 mmol/g for most of the trivalent cations, respectively. On the contrary, Meso-Mn showed priority in Fe 3+ uptake at higher initial Fe 3+ concentration. Neither of ETS-1, ETS-2 nor Meso-Mn showed priority in trivalent Cr 3+ and tetravalent Zr 4+ removal. From the amounts of heavy metal uptake, ETS-1 and ETS-2 were suggested to be layered materials as reported.