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<p>The aim of this study is to characterize and apply the nano-LDH and EDTA on natural clinoptilolite zeolite for removal of lead cations from aqueous solution. The physicochemical properties of synthesized nano-composite were carried out by XRD, BET, FESEM, FT-IR, EDS and pHzpc analysis. In order to determine the optimal conditions for the absorption of lead ions, the parameters of the initial concentration of lead, contact time, initial pH, amount and type of adsorbent were used using central composite design (CCD) statistical method. The performance of this process was evaluated based on the responses of percentage removal of lead ions. Determining the number of experiments, statistical analysis of data and optimization of lead ion removal were performed using the CCD method. Results showed the percentage of lead ion removal efficiency under optimal conditions. The effect of operating parameters on lead removal efficiency are significant, also the highest degree of kinetic compatibility was obtained with quadratic model which was chosen as the best example to describe the kinetic behavior of absorbent. In this paper, the effectiveness of zeolite/LDH in absorbing lead compared to zeolite/EDTA adsorbent from aqueous solution has been proven. The maximum removal of 100% was achieved with the adsorbent dose of 1.35&#xa0;g/L, the lead concentration was 5.5&#xa0;mg/L, the pH of the solution was 7.2 at room temperature and the contact time was 5&#xa0;min. Also, a 57% decrease in absorption efficiency (100–67%) was observed after five uses and regenerations.</p>

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Investigation of lead removal from aqueous solution with nano-composite of Mg-Al layered double hydroxides/EDTA coated on zeolite using central composite design method

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  • 发表日期：

    2026年4月26日

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  • Forough Aliniya Sayyad,
  • Mehdi Meftah Halaghi,
  • Yousef Dadban Shahamat

摘要

The aim of this study is to characterize and apply the nano-LDH and EDTA on natural clinoptilolite zeolite for removal of lead cations from aqueous solution. The physicochemical properties of synthesized nano-composite were carried out by XRD, BET, FESEM, FT-IR, EDS and pHzpc analysis. In order to determine the optimal conditions for the absorption of lead ions, the parameters of the initial concentration of lead, contact time, initial pH, amount and type of adsorbent were used using central composite design (CCD) statistical method. The performance of this process was evaluated based on the responses of percentage removal of lead ions. Determining the number of experiments, statistical analysis of data and optimization of lead ion removal were performed using the CCD method. Results showed the percentage of lead ion removal efficiency under optimal conditions. The effect of operating parameters on lead removal efficiency are significant, also the highest degree of kinetic compatibility was obtained with quadratic model which was chosen as the best example to describe the kinetic behavior of absorbent. In this paper, the effectiveness of zeolite/LDH in absorbing lead compared to zeolite/EDTA adsorbent from aqueous solution has been proven. The maximum removal of 100% was achieved with the adsorbent dose of 1.35 g/L, the lead concentration was 5.5 mg/L, the pH of the solution was 7.2 at room temperature and the contact time was 5 min. Also, a 57% decrease in absorption efficiency (100–67%) was observed after five uses and regenerations.