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<p>Orange Acid 7 (AO7) is a well-known, low-cost, and toxic azo dye widely used in industries such as paper, textiles, food, and for manufacturing personal care products, detergents, and laundry agents. Chronic exposure to this compound is toxic and carcinogenic, making the removal of such substances from aqueous solutions crucial. The aim of this study is to synthesize the MgAl-LDH@TiO₂ nanocomposite and investigate its application as an adsorbent for the removal of AO7. The structural properties of the nanoadsorbent were analyzed using SEM, EDX, FTIR, and XRD techniques. The initial solution pH, adsorbent dosage, contact time, initial dye concentration, and temperature were investigated for their effects on the process. Additionally, thermodynamic studies, isotherms, and kinetics of the adsorption process were conducted. Data analysis was performed using SPSS software. Removal efficiency of AO7 was achieved 97% using the MgAl-LDH@TiO₂ nanocomposite under the following conditions: pH 6, nanoparticle dosage 0.05&#xa0;g/100&#xa0;mL, initial dye concentration 100&#xa0;mg/L, ambient temperature, and a contact time of 5&#xa0;min. Due to its high efficiency at low contact times, non-toxic nature, ease of synthesis, and simple application, this nanoadsorbent can be recommended and used in water and wastewater treatment systems for the removal of specific pollutants.</p> Graphical Abstract <p></p>

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Synthesis and Application of Two-dimensional Layered Double Hydroxides Nanocomposite Functionalized with Titanium Dioxide (LDH@TiO2) in the Removal of Orange Acid Dye from Aqueous Solutions: Thermodynamic, Isotherm and Kinetics Studies

  • 期刊论文

  • 发表日期：

    2026年2月2日

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  • Hakimeh Mahdizadeh,
  • Alireza Nasiri,
  • Majid Amiri Gharaghani,
  • Salman Farahbakhsh,
  • Faegheh Torabi,
  • Neda Javid

摘要

Orange Acid 7 (AO7) is a well-known, low-cost, and toxic azo dye widely used in industries such as paper, textiles, food, and for manufacturing personal care products, detergents, and laundry agents. Chronic exposure to this compound is toxic and carcinogenic, making the removal of such substances from aqueous solutions crucial. The aim of this study is to synthesize the MgAl-LDH@TiO₂ nanocomposite and investigate its application as an adsorbent for the removal of AO7. The structural properties of the nanoadsorbent were analyzed using SEM, EDX, FTIR, and XRD techniques. The initial solution pH, adsorbent dosage, contact time, initial dye concentration, and temperature were investigated for their effects on the process. Additionally, thermodynamic studies, isotherms, and kinetics of the adsorption process were conducted. Data analysis was performed using SPSS software. Removal efficiency of AO7 was achieved 97% using the MgAl-LDH@TiO₂ nanocomposite under the following conditions: pH 6, nanoparticle dosage 0.05 g/100 mL, initial dye concentration 100 mg/L, ambient temperature, and a contact time of 5 min. Due to its high efficiency at low contact times, non-toxic nature, ease of synthesis, and simple application, this nanoadsorbent can be recommended and used in water and wastewater treatment systems for the removal of specific pollutants.

Graphical Abstract