Scholarlink

<p>This study presents the synthesis and evaluation of a novel adsorbent for removing toluene from aqueous environments, comprising silica aerogel reinforced with recycled PET (rPET) short fibers and coated with a chitosan-FeCl₃ complex. Characterization revealed a high surface area of 606.34 m2/g and hydrophobicity (contact angle &gt;126°). Adsorption experiments optimized via Response Surface Methodology achieved 99.52% toluene removal under optimal conditions (pH 6.5, 0.325 g adsorbent, 325 ppm pollutant, 32.5 min, 35°C). Kinetic studies followed a pseudo-second-order model (R2 = 0.983), with intraparticle diffusion analysis indicating a multi-step process involving film diffusion and surface adsorption alongside diffusion within the porous structure (k<sub>i</sub> ~34.76 mg/g·min<sup>1/2</sup>), (C ~ -27.74 mg/g). The Langmuir isotherm (R2 = 0.9936) confirmed a maximum capacity of 351 mg/g, while the Dubinin-Radushkevich model (E ~ 0.461kJ/mol) indicated predominantly physical adsorption. Thermodynamic analysis revealed an endothermic process (ΔHº 9.43 kJ/mol), (ΔSº 96.2 J/mol·K), (ΔGº~ -20.16 kJ/mol) at 35°C, supporting increased adsorption efficiency up to 33°C within the 20–40°C range. Adsorbent maintained effectiveness over four regeneration cycles, demonstrating its potential for eco-engineered toluene remediation and organic pollutant removal, such as in crude oil-contaminated wastewater, contributing to environmental protection and plastic waste management.</p> Graphical Abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

FeCl₃-Decorated Silica Aerogel-rPET Biosorbent for Toluene Removal: Characterization and Optimization

  • 期刊论文

  • 发表日期：

    2025年11月11日

查看全文
  • Vida Abedi,
  • Lobat Taghavi,
  • Hadi Farahani,
  • Homayon Ahmad Panahi,
  • Kambiz Larijani

摘要

This study presents the synthesis and evaluation of a novel adsorbent for removing toluene from aqueous environments, comprising silica aerogel reinforced with recycled PET (rPET) short fibers and coated with a chitosan-FeCl₃ complex. Characterization revealed a high surface area of 606.34 m2/g and hydrophobicity (contact angle >126°). Adsorption experiments optimized via Response Surface Methodology achieved 99.52% toluene removal under optimal conditions (pH 6.5, 0.325 g adsorbent, 325 ppm pollutant, 32.5 min, 35°C). Kinetic studies followed a pseudo-second-order model (R2 = 0.983), with intraparticle diffusion analysis indicating a multi-step process involving film diffusion and surface adsorption alongside diffusion within the porous structure (ki ~34.76 mg/g·min1/2), (C ~ -27.74 mg/g). The Langmuir isotherm (R2 = 0.9936) confirmed a maximum capacity of 351 mg/g, while the Dubinin-Radushkevich model (E ~ 0.461kJ/mol) indicated predominantly physical adsorption. Thermodynamic analysis revealed an endothermic process (ΔHº 9.43 kJ/mol), (ΔSº 96.2 J/mol·K), (ΔGº~ -20.16 kJ/mol) at 35°C, supporting increased adsorption efficiency up to 33°C within the 20–40°C range. Adsorbent maintained effectiveness over four regeneration cycles, demonstrating its potential for eco-engineered toluene remediation and organic pollutant removal, such as in crude oil-contaminated wastewater, contributing to environmental protection and plastic waste management.

Graphical Abstract