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<p>Bottom ash/Zeolitic Imidazole Framework-8 (BA/ZIF-8) nanocomposite was synthesized and evaluated for the efficient adsorption of arsenic As(III) from simulated wastewater. The material combined coal-derived bottom ash, a thermoelectric power plant by-product, with ZIF-8 nanoparticles to enhance surface area and adsorption stability. Structural characterization (FTIR, XRD, and SEM-EDS) confirmed physical adherence of ZIF-8 onto the ash substrate without new chemical bond formation. Optimization studies identified pH 8, contact time 6&#xa0;h, adsorbent dosage 4&#xa0;g L⁻¹, and temperature 298&#xa0;K as the optimal operating conditions. Under these parameters, the composite achieved 73% As(III) removal (2.6&#xa0;mg g⁻¹), following Langmuir isotherm (R² = 0.95) and pseudo-second-order kinetics (R² = 0.98), indicating monolayer chemisorption as the dominant mechanism. Thermodynamic analysis (ΔH = − 42.88&#xa0;kJ mol⁻¹) revealed an exothermic and spontaneous adsorption process. Reusability studies demonstrated stability for up to two adsorption-desorption cycles, after which efficiency declined due to composite disintegration. Life Cycle Assessment (LCA) of a 1&#xa0;kg functional unit indicated that zinc nitrate hexahydrate, methanol, and electricity consumption were the primary environmental hotspots, with global warming potential of 66&#xa0;kg CO₂ eq.&#xa0;These findings underscore the potential of BA/ZIF-8 as a cost-effective, waste-derived adsorbent for sustainable arsenic removal, while emphasizing the need for process optimization and improved recyclability to reduce environmental burden.</p>

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Life cycle assessment and adsorption performance of bottom ash/Zeolitic imidazole framework-8 composite for arsenic removal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月16日

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  • Rachana Singh,
  • Kavya Bisaria,
  • Swati Solanki

摘要

Bottom ash/Zeolitic Imidazole Framework-8 (BA/ZIF-8) nanocomposite was synthesized and evaluated for the efficient adsorption of arsenic As(III) from simulated wastewater. The material combined coal-derived bottom ash, a thermoelectric power plant by-product, with ZIF-8 nanoparticles to enhance surface area and adsorption stability. Structural characterization (FTIR, XRD, and SEM-EDS) confirmed physical adherence of ZIF-8 onto the ash substrate without new chemical bond formation. Optimization studies identified pH 8, contact time 6 h, adsorbent dosage 4 g L⁻¹, and temperature 298 K as the optimal operating conditions. Under these parameters, the composite achieved 73% As(III) removal (2.6 mg g⁻¹), following Langmuir isotherm (R² = 0.95) and pseudo-second-order kinetics (R² = 0.98), indicating monolayer chemisorption as the dominant mechanism. Thermodynamic analysis (ΔH = − 42.88 kJ mol⁻¹) revealed an exothermic and spontaneous adsorption process. Reusability studies demonstrated stability for up to two adsorption-desorption cycles, after which efficiency declined due to composite disintegration. Life Cycle Assessment (LCA) of a 1 kg functional unit indicated that zinc nitrate hexahydrate, methanol, and electricity consumption were the primary environmental hotspots, with global warming potential of 66 kg CO₂ eq. These findings underscore the potential of BA/ZIF-8 as a cost-effective, waste-derived adsorbent for sustainable arsenic removal, while emphasizing the need for process optimization and improved recyclability to reduce environmental burden.