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<p>Removal and recovery of nickel and zinc ions from electroplating wastewater was performed through the synthesis of waste derived layered double hydroxides (LDHs). E-NiFe-LDH and E-ZnFe-LDH (E: derived from spent electroplating bath) adsorbents were utilized for the removal of 2,4-Dichlorophenoxyacetic acid (2,4-D) based herbicide. XRD patterns indicated the presence of typical LDH crystalline phases for both E-NiFe-LDH and E-ZnFe-LDH adsorbents. FTIR spectra exhibited characteristic bands related to hydroxyl groups, interlayer carbonate anions, and metal–oxygen vibrations. BET surface areas of E-NiFe-LDH and E-ZnFe-LDH were found to be 133.2 and 86.87&#xa0;m<sup>2</sup>/g, respectively. The adsorbent selection experiments showed that the adsorption performance of E-NiFe-LDH was superior to E-ZnFe-LDH. Under the optimum conditions (5&#xa0;g/L adsorbent dosage, pH 6, and 320&#xa0;rpm shaking rate), 47.18% 2,4-D dimethylamine salt removal was achieved in 3&#xa0;h whereas 37.6% nickel recovery was obtained by the synthesized E-NiFe-LDH adsorbent. The equilibrium adsorption behavior was analyzed by using Langmuir, Temkin, and Dubinin–Radushkevich isotherm models. The Langmuir model provided the best fit to the experimental data, with a correlation coefficient of 0.9838. The Langmuir constant (K<sub>L</sub>) was calculated as 1.877&#xa0;L/mg and the maximum adsorption capacity was found to be 38.314&#xa0;mg/g in the presence of E-NiFe-LDH adsorbent.</p> Graphic Abstract <p></p>

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Utilization of Electroplating Industry Waste-Derived Layered Double Hydroxides for the Removal of Environmental Contaminants: Ni and Zn Recovery and Adsorption of Pesticides

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Merve Bayrakdar,
  • Burcu Palas,
  • Gülin Ersöz

摘要

Removal and recovery of nickel and zinc ions from electroplating wastewater was performed through the synthesis of waste derived layered double hydroxides (LDHs). E-NiFe-LDH and E-ZnFe-LDH (E: derived from spent electroplating bath) adsorbents were utilized for the removal of 2,4-Dichlorophenoxyacetic acid (2,4-D) based herbicide. XRD patterns indicated the presence of typical LDH crystalline phases for both E-NiFe-LDH and E-ZnFe-LDH adsorbents. FTIR spectra exhibited characteristic bands related to hydroxyl groups, interlayer carbonate anions, and metal–oxygen vibrations. BET surface areas of E-NiFe-LDH and E-ZnFe-LDH were found to be 133.2 and 86.87 m2/g, respectively. The adsorbent selection experiments showed that the adsorption performance of E-NiFe-LDH was superior to E-ZnFe-LDH. Under the optimum conditions (5 g/L adsorbent dosage, pH 6, and 320 rpm shaking rate), 47.18% 2,4-D dimethylamine salt removal was achieved in 3 h whereas 37.6% nickel recovery was obtained by the synthesized E-NiFe-LDH adsorbent. The equilibrium adsorption behavior was analyzed by using Langmuir, Temkin, and Dubinin–Radushkevich isotherm models. The Langmuir model provided the best fit to the experimental data, with a correlation coefficient of 0.9838. The Langmuir constant (KL) was calculated as 1.877 L/mg and the maximum adsorption capacity was found to be 38.314 mg/g in the presence of E-NiFe-LDH adsorbent.

Graphic Abstract