Scholarlink

<p>The development of efficient, low-cost, and sustainable adsorbents remains critical for mitigating heavy-metal contamination in industrial wastewater. In this study, waste-derived iron oxide-clay composites were engineered via a green synthesis route using <i>Parkia biglobosa</i> leaf extract to produce hematite nanoparticles from waste iron filings (WIF) and analytical-grade iron salts, followed by intercalation into clay matrices. Two composite adsorbents, WIF-derived iron oxide-clay (WIFC) and analytical-grade iron oxide-clay (AGIC), were obtained and systematically characterised. UV–Vis spectroscopy confirmed nanoparticle formation, while FT-IR revealed abundant surface functional groups conducive to metal coordination. XRD analysis identified quartz and kaolinite phases, and EDS verified iron incorporation as hematite. SEM micrographs showed well-dispersed, quasi-spherical nanoparticles within the clay framework. Nitrogen adsorption-desorption analysis revealed high specific surface areas of 37.2 and 37.8&#xa0;m² g⁻¹ for WIFC and AGIC, respectively, with mesoporous structures favourable for rapid mass transfer. Batch adsorption experiments demonstrated fast removal of Zn(II), Pb(II), and Cu(II) ions, with equilibrium achieved within 90&#xa0;min. Adsorption kinetics followed a pseudo-second-order model (R² = 0.953–0.999), and isotherm data were best described by the Langmuir model, indicating chemisorption-dominated monolayer uptake with maximum capacities of 26.78, 29.73, and 25.73&#xa0;mg g⁻¹, respectively. Thermodynamic analyses confirmed spontaneous and exothermic adsorption. Overall, the waste-derived WIFC composite presents a scalable, environmentally benign, and high-performance solution for heavy-metal remediation in industrial 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

Waste-Derived Iron Oxide-Clay Composites for Rapid and Chemisorption-Driven Removal of Heavy Metals from Industrial Wastewater

  • 期刊论文

  • 发表日期：

    2026年6月29日

查看全文
  • Mary Adejoke Ajala,
  • Adetola Christianah Oladipo,
  • Idris Adetunji,
  • Amos Adewale Adegbite

摘要

The development of efficient, low-cost, and sustainable adsorbents remains critical for mitigating heavy-metal contamination in industrial wastewater. In this study, waste-derived iron oxide-clay composites were engineered via a green synthesis route using Parkia biglobosa leaf extract to produce hematite nanoparticles from waste iron filings (WIF) and analytical-grade iron salts, followed by intercalation into clay matrices. Two composite adsorbents, WIF-derived iron oxide-clay (WIFC) and analytical-grade iron oxide-clay (AGIC), were obtained and systematically characterised. UV–Vis spectroscopy confirmed nanoparticle formation, while FT-IR revealed abundant surface functional groups conducive to metal coordination. XRD analysis identified quartz and kaolinite phases, and EDS verified iron incorporation as hematite. SEM micrographs showed well-dispersed, quasi-spherical nanoparticles within the clay framework. Nitrogen adsorption-desorption analysis revealed high specific surface areas of 37.2 and 37.8 m² g⁻¹ for WIFC and AGIC, respectively, with mesoporous structures favourable for rapid mass transfer. Batch adsorption experiments demonstrated fast removal of Zn(II), Pb(II), and Cu(II) ions, with equilibrium achieved within 90 min. Adsorption kinetics followed a pseudo-second-order model (R² = 0.953–0.999), and isotherm data were best described by the Langmuir model, indicating chemisorption-dominated monolayer uptake with maximum capacities of 26.78, 29.73, and 25.73 mg g⁻¹, respectively. Thermodynamic analyses confirmed spontaneous and exothermic adsorption. Overall, the waste-derived WIFC composite presents a scalable, environmentally benign, and high-performance solution for heavy-metal remediation in industrial wastewater.