Citation: Yuanpei ZHANG, Jiahong WANG, Jinming HUANG, Zhi HU. Preparation of magnetic mesoporous carbon loaded nano zero-valent iron for removal of Cr(Ⅲ) organic complexes from high-salt wastewater[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(9): 1731-1742. doi: 10.11862/CJIC.20240077 shu

Preparation of magnetic mesoporous carbon loaded nano zero-valent iron for removal of Cr(Ⅲ) organic complexes from high-salt wastewater

Yuanpei ZHANG ^{1, 2} ,
Jiahong WANG ^{1, 2,,} ,
Jinming HUANG ^{1, 2} ,
Zhi HU ^{1, 2}

1.
School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an 710021, China
2.
Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China

Corresponding author: Jiahong WANG, wangjiahong@sust.edu.cn
Received Date: 11 March 2024
Revised Date: 29 June 2024

Figures(11)

Magnetically mesoporous carbon (Fe₃O₄@C)/nano-zerovalent iron (nZVI) composites (Fe₃O₄@C-nZVI) were successfully prepared by a liquid-phase reduction for the effective removal of Cr(Ⅲ)-EDTA (EDTA: ethylenediaminetetra-acetic acid) in high-salinity wastewater. By characterization and analysis by scanning electron microscope (SEM) and electron microscope (TEM), the nZVI has been successfully loaded into the carbon layer without significant agglomeration and can be magnetically separated and nZVI was stable under the protection of a carbon layer which is favorable for the reuse of materials. The presence of nZVI on the adsorbents greatly improved the adsorption of Cr(Ⅲ)-EDTA and the maximum adsorption capacity of Fe₃O₄@C-nZVI was 10.24 mg·g^-1 at pH=4.0, 25 ℃, which was remarkably higher than that of Fe₃O₄@C (4.31 mg·g^-1). The results showed that the Langmuir model and the pseudo-second-order kinetic model can better describe the adsorption of Cr(Ⅲ)-EDTA by Fe₃O₄@C-nZVI. The adsorption capacity of Fe₃O₄@C-nZVI on Cr(Ⅲ)-EDTA increased and then decreased with the increase of solution pH value; low concentrations of complexing agents (EDTA, citric acid) would promote the adsorption of Cr(Ⅲ)-EDTA, whereas an increase in the concentration of the complexing agents showed inhibition; due to the charge shielding effect, high concentrations of cations (Na⁺, K⁺, Ca²⁺) in the solution will promote the adsorption of Cr(Ⅲ)-EDTA. Fe₃O₄@C-nZVI still showed significant adsorption of Cr(Ⅲ)-EDTA in a salt and complexant environment. The adsorption saturated Fe₃O₄@C-nZVI was regenerated by 0.1 mol·L^-1 HCl solution, the adsorption of Cr(Ⅲ)-EDTA by Fe₃O₄@CnZVI reached 6.90 mg·g^-1 after three regeneration cycles. X -ray photoelectron spectrum analysis of Fe₃O₄@C-nZVI before and after reaction showed that the adsorption mechanism was mainly through complexation between surface FeⅢ and Cr(Ⅲ)-EDTA to form FeⅢ-EDTA-Cr(Ⅲ) complexation products, and subsequently displaces Cr(Ⅲ) due to ionic displacement, and the displaced Cr(Ⅲ) will be removed by co-precipitation with FeⅢ as Cr_xFe_1-x(OH)₃ deposited on the nZVI surface.
- magnetically mesoporous carbon,
- nano zero-valent iron,
- Cr(Ⅲ),
- high salinity water,
- adsorption mechanism
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