1. Mn-Fe Layered Double Hydroxide Intercalated with Ethylene-Diaminetetraacetate Anion: Synthesis and Removal of As(III) from Aqueous Solution around pH 2–11
- Author
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Lihao Zhang, Liu Guifeng, Zongqiang Zhu, Gao Yingying, Fang Yali, Zhao Ningning, and Yinian Zhu
- Subjects
Anions ,redox reaction ,Coprecipitation ,Health, Toxicology and Mutagenesis ,Iron ,Inorganic chemistry ,lcsh:Medicine ,02 engineering and technology ,ion exchange ,010501 environmental sciences ,engineering.material ,01 natural sciences ,Redox ,Article ,Chemistry Techniques, Analytical ,Arsenic ,chemistry.chemical_compound ,Adsorption ,Spectroscopy, Fourier Transform Infrared ,Hydroxides ,LDHs ,Magnesium ,As ,Edetic Acid ,0105 earth and related environmental sciences ,Aqueous solution ,Ion exchange ,lcsh:R ,Public Health, Environmental and Occupational Health ,Layered double hydroxides ,EDTA ,Hydrogen-Ion Concentration ,021001 nanoscience & nanotechnology ,chemistry ,engineering ,Hydroxide ,0210 nano-technology ,Saturation (chemistry) - Abstract
A novel adsorbent Mn-Fe layered double hydroxides intercalated with ethylenediaminete-traacetic (EDTA@MF-LDHs) was synthesized by a low saturation coprecipitation method. The behavior and mechanism of As(III) removed by EDTA@MF-LDHs were investigated in detail in comparison with the carbonate intercalated Mn-Fe layered double hydroxides (CO3@MF-LDHs). The results showed that EDTA@MF-LDHs had a higher removal efficiency for As(III) than As(V) with a broader pH range than CO3@MF-LDH. The large adsorption capacity of EDTA@MF-LDHs is related to its large interlayer spacing and the high affinity of its surface hydroxyl groups. The maximum adsorption capacity for As(III) is 66.76 mg/g at pH 7. The FT-IR and XPS characterization indicated that the removal mechanism of the As(III) on EDTA@MF-LDHs include surface complexation, redox, and ion exchange.
- Published
- 2020