Scholarlink

<p>This work explores the feasibility of using waste foundry sand (WFS) as an alternative adsorbent for the removal of Malachite green (MG) dye from aqueous solutions. The physicochemical characteristics of WFS were examined using nitrogen adsorption–desorption analysis, Fourier-transform infrared spectroscopy (FTIR), Boehm titration, and determination of the point of zero charge (pH<sub>PZC</sub>). The material exhibited a specific surface area of 1.66&#xa0;m<sup>2</sup>/g and a pH<sub>PZC</sub> value of 7.3. A Box–Behnken experimental design (BBD) was applied to evaluate the combined effects of initial MG concentration, adsorbent dosage, and solution pH on dye removal performance. The developed model was statistically significant (<i>F</i> = 38.34, <i>p</i> = 0.0004) with a high coefficient of determination (<i>R</i><sup>2</sup> = 0.9859). Under the optimum conditions of 30 mg/L initial MG concentration, 0.67 g/L WFS, and pH 10.00, the experimental adsorption capacity reached 32.93&#xa0;mg/g, with a relative error of only 1.47% compared with the predicted value. Kinetic studies showed that adsorption reached equilibrium within 60&#xa0;min and was best described by the pseudo-second&#xa0;order model (<i>R</i><sup>2</sup> = 0.976). Equilibrium studies showed that the adsorption behavior was better represented by the Freundlich isotherm, suggesting a heterogeneous surface and multilayer adsorption mechanism, while the Langmuir maximum adsorption capacity was 64.12&#xa0;mg/g. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic, with Δ<i>H</i>° = 7.91&#xa0;kJ/mol, Δ<i>S</i>° = 52.02&#xa0;J/mol/K, and Δ<i>G</i>° values ranging from − 7.04 to − 8.06&#xa0;kJ/mol. These findings demonstrate that WFS is a promising, sustainable, and cost-effective adsorbent for dye-contaminated wastewater.</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

Application of waste foundry sand in the adsorption of Malachite green dye from aqueous solutions

  • 期刊论文

  • 发表日期：

    2026年3月21日

查看全文
  • Hadj Daoud Bouras,
  • Kelthoum Gagi,
  • Mounir Daoud,
  • Fella Bennaceur,
  • Yasmina Khane,
  • Abdallah Aissa,
  • Pinar Belibagli,
  • Lidia Favier,
  • Mutlu Yalvac,
  • Nadir Dizge

摘要

This work explores the feasibility of using waste foundry sand (WFS) as an alternative adsorbent for the removal of Malachite green (MG) dye from aqueous solutions. The physicochemical characteristics of WFS were examined using nitrogen adsorption–desorption analysis, Fourier-transform infrared spectroscopy (FTIR), Boehm titration, and determination of the point of zero charge (pHPZC). The material exhibited a specific surface area of 1.66 m2/g and a pHPZC value of 7.3. A Box–Behnken experimental design (BBD) was applied to evaluate the combined effects of initial MG concentration, adsorbent dosage, and solution pH on dye removal performance. The developed model was statistically significant (F = 38.34, p = 0.0004) with a high coefficient of determination (R2 = 0.9859). Under the optimum conditions of 30 mg/L initial MG concentration, 0.67 g/L WFS, and pH 10.00, the experimental adsorption capacity reached 32.93 mg/g, with a relative error of only 1.47% compared with the predicted value. Kinetic studies showed that adsorption reached equilibrium within 60 min and was best described by the pseudo-second order model (R2 = 0.976). Equilibrium studies showed that the adsorption behavior was better represented by the Freundlich isotherm, suggesting a heterogeneous surface and multilayer adsorption mechanism, while the Langmuir maximum adsorption capacity was 64.12 mg/g. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic, with ΔH° = 7.91 kJ/mol, ΔS° = 52.02 J/mol/K, and ΔG° values ranging from − 7.04 to − 8.06 kJ/mol. These findings demonstrate that WFS is a promising, sustainable, and cost-effective adsorbent for dye-contaminated wastewater.