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Journal of Experimental Nanoscience Volume 15, 2020 - Issue 1
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Article

Interaction of metal ions with humic acids of brown coals of Kazakhstan

A. DauletbayChemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, KazakhstanCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0003-0157-1449View further author information
ORCID Icon,
B. A. SerikbayevChemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, KazakhstanView further author information
,
D. Kh. KamysbayevChemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, KazakhstanView further author information
&
L. K. KudreevaChemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, KazakhstanView further author information
Pages 406-416 | Received 09 Oct 2019, Accepted 06 Aug 2020, Published online: 25 Aug 2020

Figures & data

Figure 1. Dependence of the metal ions’ absorption efficiency from the volume of HA.

Figure 1. Dependence of the metal ions’ absorption efficiency from the volume of HA.

Figure 2. IR spectra of HA (a) and HA with Fe3+ (b).

Figure 2. IR spectra of HA (a) and HA with Fe3+ (b).

Figure 3. Spectrophotometric curves of Fe3+ ions and their solutions with humic acids.

Figure 3. Spectrophotometric curves of Fe3+ ions and their solutions with humic acids.

Figure 4. Spectrophotometric curves of Cu2+ ions and their solutions with humic acids.

Figure 4. Spectrophotometric curves of Cu2+ ions and their solutions with humic acids.

Figure 5. Spectrophotometric curves of Ni2+ ions and their solutions with humic acids.

Figure 5. Spectrophotometric curves of Ni2+ ions and their solutions with humic acids.

Figure 6. Linear sweep cyclic voltammetry of Cu (II) (10−4 mol L−1) 0.1 mol L−1 Na2SO4 (pH 3.5) solution at glassy carbon electrodes modified with: (1) CuHA; (2) HA; (3) nafion; (4) GCE. Scan rate 50 mV s−1.

Figure 6. Linear sweep cyclic voltammetry of Cu (II) (10−4 mol L−1) 0.1 mol L−1 Na2SO4 (pH 3.5) solution at glassy carbon electrodes modified with: (1) CuHA; (2) HA; (3) nafion; (4) GCE. Scan rate 50 mV s−1.

Figure 7. Linear sweep cyclic voltammetry of Cu (II) (10−4 mol L−1) solution at the CuHA-GCE. Scan rate 50 mV s−1. Electrolyte: 0.1 mol L−1 Na2SO4 solution at (1) pH 3.0, (2) pH 4.5, (3) pH 5.5 and (4) рН 6.5.

Figure 7. Linear sweep cyclic voltammetry of Cu (II) (10−4 mol L−1) solution at the CuHA-GCE. Scan rate 50 mV s−1. Electrolyte: 0.1 mol L−1 Na2SO4 solution at (1) pH 3.0, (2) pH 4.5, (3) pH 5.5 and (4) рН 6.5.

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