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<p>The prevention and management of solid waste are intricately linked to the control of water, air, and soil pollution, making it a critical aspect of environmental protection. In response to the escalating solid waste and air pollution caused by the coatings industry, we adopt a waste-to-resource approach by recycling and reusing paint residues. This study investigates the use of paint residue as a raw material, modified with urea, KOH, and HCl to synthesize high-quality activated carbon for o-xylene adsorption. Dynamic adsorption experiments reveal that PAU-K<sub>8</sub>H<sub>0.3</sub> exhibits the highest o-xylene adsorption capacity (309&#xa0;mg/g), surpassing previous findings. Comprehensive characterization indicates that micropores are the primary sites for o-xylene adsorption, while mesopores significantly enhance its diffusion. Additionally, the presence of nitrogen and oxygen-containing functional groups on the surface increases the chemical adsorption of o-xylene through electrostatic forces and π-π interactions. The pseudo-first-order kinetic model best describes o-xylene adsorption. The equilibrium adsorption data align closely with the Freundlich isotherm model, suggesting multilayer adsorption. The intraparticle diffusion model indicates that both boundary layer diffusion and intraparticle diffusion may contribute to the adsorption process. The adsorption mechanism of activated carbon on o-xylene involves van der Waals forces, hydrogen bonding, <i>π</i>–<i>π</i> interactions, and electrostatic forces. The adsorption–desorption cycling experiments indicate that activated carbon is difficult to completely desorb at room temperature. However, as the desorption temperature increases, its adsorption capacity significantly recovers, achieving full regeneration at 120&#xa0;℃. The pore structure and specific surface area play a decisive role in the adsorption–desorption performance and regeneration efficiency of activated carbon. Optimizing the pore structure is the key strategy to enhance the regeneration performance of adsorbents.</p>

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Treating waste with waste: facile synthesis activated carbon from paint residue for efficient adsorption of o-xylene

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Yuzhen Cao,
  • Hao Wang,
  • Chaoyang Xing,
  • Yuhang Wu,
  • Ji Mei,
  • Yang Jiao,
  • Jianrong Chen

摘要

The prevention and management of solid waste are intricately linked to the control of water, air, and soil pollution, making it a critical aspect of environmental protection. In response to the escalating solid waste and air pollution caused by the coatings industry, we adopt a waste-to-resource approach by recycling and reusing paint residues. This study investigates the use of paint residue as a raw material, modified with urea, KOH, and HCl to synthesize high-quality activated carbon for o-xylene adsorption. Dynamic adsorption experiments reveal that PAU-K8H0.3 exhibits the highest o-xylene adsorption capacity (309 mg/g), surpassing previous findings. Comprehensive characterization indicates that micropores are the primary sites for o-xylene adsorption, while mesopores significantly enhance its diffusion. Additionally, the presence of nitrogen and oxygen-containing functional groups on the surface increases the chemical adsorption of o-xylene through electrostatic forces and π-π interactions. The pseudo-first-order kinetic model best describes o-xylene adsorption. The equilibrium adsorption data align closely with the Freundlich isotherm model, suggesting multilayer adsorption. The intraparticle diffusion model indicates that both boundary layer diffusion and intraparticle diffusion may contribute to the adsorption process. The adsorption mechanism of activated carbon on o-xylene involves van der Waals forces, hydrogen bonding, π–π interactions, and electrostatic forces. The adsorption–desorption cycling experiments indicate that activated carbon is difficult to completely desorb at room temperature. However, as the desorption temperature increases, its adsorption capacity significantly recovers, achieving full regeneration at 120 ℃. The pore structure and specific surface area play a decisive role in the adsorption–desorption performance and regeneration efficiency of activated carbon. Optimizing the pore structure is the key strategy to enhance the regeneration performance of adsorbents.