Abstract
Developing an effective adsorbent for removing heavy metals is an interesting field in water and wastewater treatment research. This work successfully prepared and used a CuMgAl-layered double hydroxide/montmorillonite nanocomposite (CuMgAl-LDH/MMt) for the adsorption of heavy metal pollutants from an aqueous solution. The nanocomposite had a maximum adsorption capacity of 154.21 mg/g for Zn(II) ion adsorption. The Langmuir model and pseudo-second-order kinetic model presented a better fit for the Zn(II) adsorption process. The mechanism of Zn(II) adsorption mainly involves exothermic and spontaneous processes. Moreover, the effects of solution pH, pollutant concentration, adsorbent dose, temperature, and repeated use of CuMgAl-LDH/MMt on the Zn(II) adsorption were tested, revealing that CuMgAl-LDH/MMt has excellent stability and the ability to remove Zn(II) The maximum removal rate (95.1 %) was determined under conditions of pH = 5, CuMgAl-LDH/MMt dosage = 0.25 g per100 ml Zn(II) solution, particle size of adsorbent = 87 µm, shaking speed = 200 rpm, temperature = 25 °C, initial concentration = 70 mg/L, and adsorption time = 90 min. In conclusion, this study demonstrates the value of CuMgAl-LDH/MMt as the best adsorbent for the removal of Zn(II) ions from wastewater compared to other adsorbents used for the same purpose.
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