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<p>The present study investigates the efficacy of CuAl materials derived from layered double hydroxides (LDH) in the advanced removal of organic matter and micropollutants (µP) in treated municipal wastewater from the M’sila region wastewater treatment plant, Algeria. The CuAl-CO<sub>3</sub> LDH material was synthesized by coprecipitation, then transformed by calcination at 500°C and 950°C to obtain the mixed CuO/γ-Al<sub>2</sub>O<sub>3</sub> (CuAl-500) and spinel CuO/CuAl<sub>2</sub>O<sub>4</sub> (CuAl-950) oxides, respectively. The materials were characterized by their textural, electrochemical, and surface properties, revealing marked differences in specific surface area, band gap, and pH<sub>PZC</sub>. The catalytic performance of photocatalysis (UV), ozonation (O<sub>3</sub>), and photo-ozonation (UV + O<sub>3</sub>) processes was evaluated in terms of chemical oxygen demand reduction and degradation of µP identified by GC-MS. The results highlight distinct catalytic behaviors depending on the treatment process. Under ozonation conditions, CuAl-CO<sub>3</sub> exhibited the highest catalytic efficiency due to its hydroxyl-rich surface and strong O<sub>3</sub> activation ability. In contrast, CuAl-500 showed superior performance under UV and UV/O<sub>3</sub> processes, owing to its optimized electronic conductivity, enhanced charge separation, and improved generation of reactive oxygen species <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\left(HO^\bullet/ O_2^{\bullet-}\right)\)</EquationSource> </InlineEquation>. The combined UV + O<sub>3</sub>/CuAl-500 system achieved the highest mineralization and µP removal efficiency, together with improved energy efficiency.</p>

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Simultaneous Qualitative Identification and Enhancement of Ozonation, Photocatalysis, and Photo-Ozonation by Layered Double Hydroxide and its Oxides for the Removal of Organic Micropollutants in Treated Municipal Wastewater in M’sila Region, Algeria

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Ghania Radji,
  • Abderrahmane Hiri,
  • Rania Amiri,
  • Fatah Ben Moussa,
  • Nourredine Bettahar,
  • Achour Dakhouche

摘要

The present study investigates the efficacy of CuAl materials derived from layered double hydroxides (LDH) in the advanced removal of organic matter and micropollutants (µP) in treated municipal wastewater from the M’sila region wastewater treatment plant, Algeria. The CuAl-CO3 LDH material was synthesized by coprecipitation, then transformed by calcination at 500°C and 950°C to obtain the mixed CuO/γ-Al2O3 (CuAl-500) and spinel CuO/CuAl2O4 (CuAl-950) oxides, respectively. The materials were characterized by their textural, electrochemical, and surface properties, revealing marked differences in specific surface area, band gap, and pHPZC. The catalytic performance of photocatalysis (UV), ozonation (O3), and photo-ozonation (UV + O3) processes was evaluated in terms of chemical oxygen demand reduction and degradation of µP identified by GC-MS. The results highlight distinct catalytic behaviors depending on the treatment process. Under ozonation conditions, CuAl-CO3 exhibited the highest catalytic efficiency due to its hydroxyl-rich surface and strong O3 activation ability. In contrast, CuAl-500 showed superior performance under UV and UV/O3 processes, owing to its optimized electronic conductivity, enhanced charge separation, and improved generation of reactive oxygen species \(\left(HO^\bullet/ O_2^{\bullet-}\right)\) . The combined UV + O3/CuAl-500 system achieved the highest mineralization and µP removal efficiency, together with improved energy efficiency.