Scholarlink

<p>The study enhances waste-to-resource circularity by transforming orange peel waste into an efficient biocatalyst for wastewater remediation. The excessive industrial use of methylene blue (MB) and <i>p</i>-nitrophenol (PNP) generates hazardous wastewater, posing significant risks to ecosystems and public health. To address this, a spherical copper nanoparticle-decorated hydrochar nanocomposite (CuNP/HC) was developed from orange peel waste via hydrothermal reduction. Structural analysis via XPS analysis confirmed oxygen-functional groups (C–OH, C=O, –COO<sup>−</sup>) and zero-valent copper on CuNP/HC surfaces, while XRD revealed highly crystalline Cu⁰ with a face-centered cubic (FCC) structure. The uniformly dispersed spherical CuNPs (10–20 nm) and hydrochar’s carbonaceous framework (evidenced by UV–Vis π-π*/n-π*&#xa0;transitions) endowed the nanocomposite with enhanced catalytic properties. CuNP/HC served as a biocatalyst for the degradation of anthropogenic pollutants (MB and PNP) using NaBH<sub>4</sub>, following pseudo-first-order kinetics. Under optimized conditions (including pollutant concentration, catalyst dosage, NaBH<sub>4</sub> concentration and pH), the apparent rate constants (k<sub>app</sub>) were 0.1782 min<sup>−1</sup> for PNP (30.58 µM,&#xa0;<i>R</i><sup>2</sup> = 0.9982) and 0.1546 min<sup>−1</sup> for MB (15.63 µM,&#xa0;<i>R</i><sup>2</sup> = 0.9972), achieving complete degradation within 10.27 and 11.73 min, respectively. Notably, normalized rate constants (K<sub>app</sub>) reached 19.44 g<sup>−1</sup> s<sup>−1</sup> (PNP) and 16.58 g<sup>−1</sup> s<sup>−1</sup> (MB) at maximal catalyst loading (CuNP/HC dosage), outperforming bare HC (free-CuNPs, via adsorption). The CuNP/HC nanocomposite demonstrated exceptional stability and sustained catalytic efficiency across multiple cycles, confirming scalability for wastewater remediation.</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

Efficient catalytic reduction of methylene blue and p-Nitrophenol by CuNP/hydrochar nanocomposites synthesized from organic peel waste

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月10日

查看全文
  • N. Hamad,
  • Ahmed A. Galhoum,
  • A. Saad,
  • S. Wageh

摘要

The study enhances waste-to-resource circularity by transforming orange peel waste into an efficient biocatalyst for wastewater remediation. The excessive industrial use of methylene blue (MB) and p-nitrophenol (PNP) generates hazardous wastewater, posing significant risks to ecosystems and public health. To address this, a spherical copper nanoparticle-decorated hydrochar nanocomposite (CuNP/HC) was developed from orange peel waste via hydrothermal reduction. Structural analysis via XPS analysis confirmed oxygen-functional groups (C–OH, C=O, –COO−) and zero-valent copper on CuNP/HC surfaces, while XRD revealed highly crystalline Cu⁰ with a face-centered cubic (FCC) structure. The uniformly dispersed spherical CuNPs (10–20 nm) and hydrochar’s carbonaceous framework (evidenced by UV–Vis π-π*/n-π* transitions) endowed the nanocomposite with enhanced catalytic properties. CuNP/HC served as a biocatalyst for the degradation of anthropogenic pollutants (MB and PNP) using NaBH4, following pseudo-first-order kinetics. Under optimized conditions (including pollutant concentration, catalyst dosage, NaBH4 concentration and pH), the apparent rate constants (kapp) were 0.1782 min−1 for PNP (30.58 µM, R2 = 0.9982) and 0.1546 min−1 for MB (15.63 µM, R2 = 0.9972), achieving complete degradation within 10.27 and 11.73 min, respectively. Notably, normalized rate constants (Kapp) reached 19.44 g−1 s−1 (PNP) and 16.58 g−1 s−1 (MB) at maximal catalyst loading (CuNP/HC dosage), outperforming bare HC (free-CuNPs, via adsorption). The CuNP/HC nanocomposite demonstrated exceptional stability and sustained catalytic efficiency across multiple cycles, confirming scalability for wastewater remediation.