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<p>Zn-Al layered double hydroxides (Zn-Al LDH) nanosheets with high surface area were synthesized via a novel one-step ultrasound synthesis. Subsequent calcination of the material at 500&#xa0;°C led to the conversion of Zn-Al LDH to ZnAl<sub>2</sub>O<sub>4</sub> nanocrystals. X-ray diffraction (XRD) analysis confirmed the high purity of the synthesized materials, with Zn-Al LDH crystallizing in a rhombohedral structure and ZnAl<sub>2</sub>O<sub>4</sub> adopting a face-centered cubic (FCC) structure. Morphological investigation by SEM demonstrated that the Zn-Al LDH exhibited a sheet-like morphology, which was preserved after thermal treatment. BET surface area measurements revealed that Zn-Al LDH possessed a large surface area of 220.17 m<sup>2</sup>/g, which decreased to 113.8 m<sup>2</sup>/g after calcination. Dye adsorption experiments using a 20&#xa0;mg/L methyl orange solution showed that Zn-Al LDH achieved 100% dye removal within 50&#xa0;min, whereas ZnAl<sub>2</sub>O<sub>4</sub> removed 84% within 95&#xa0;min at room temperature. Adsorption kinetics analysis showed that both materials fit the pseudo-second-order kinetic model, confirming efficient pollutant uptake. Significantly, electrochemical performance assessments via cyclic voltammetry revealed that Zn-Al LDH nanosheets exhibited a high specific capacitance of 71.9&#xa0;F/g at a scan rate of 10 mV/s, which is 1.7 times greater than that of ZnAl<sub>2</sub>O<sub>4</sub> nanocrystals. This enhancement is attributed to the higher surface area and unique layered structure, highlighting the superior potential of Zn-Al LDH for high-performance energy storage applications.</p>

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Facile Ultrasound-Assisted Synthesis, Structural, Optical, Adsorption and Electrochemical Properties of Zn-Al LDH and Spinel ZnAl2O4 Nanocrystals

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Tarek Alammar

摘要

Zn-Al layered double hydroxides (Zn-Al LDH) nanosheets with high surface area were synthesized via a novel one-step ultrasound synthesis. Subsequent calcination of the material at 500 °C led to the conversion of Zn-Al LDH to ZnAl2O4 nanocrystals. X-ray diffraction (XRD) analysis confirmed the high purity of the synthesized materials, with Zn-Al LDH crystallizing in a rhombohedral structure and ZnAl2O4 adopting a face-centered cubic (FCC) structure. Morphological investigation by SEM demonstrated that the Zn-Al LDH exhibited a sheet-like morphology, which was preserved after thermal treatment. BET surface area measurements revealed that Zn-Al LDH possessed a large surface area of 220.17 m2/g, which decreased to 113.8 m2/g after calcination. Dye adsorption experiments using a 20 mg/L methyl orange solution showed that Zn-Al LDH achieved 100% dye removal within 50 min, whereas ZnAl2O4 removed 84% within 95 min at room temperature. Adsorption kinetics analysis showed that both materials fit the pseudo-second-order kinetic model, confirming efficient pollutant uptake. Significantly, electrochemical performance assessments via cyclic voltammetry revealed that Zn-Al LDH nanosheets exhibited a high specific capacitance of 71.9 F/g at a scan rate of 10 mV/s, which is 1.7 times greater than that of ZnAl2O4 nanocrystals. This enhancement is attributed to the higher surface area and unique layered structure, highlighting the superior potential of Zn-Al LDH for high-performance energy storage applications.