Scholarlink

<p>Considering natural biopolymers are renewable, biodegradable, and biocompatible, they hold great potential as alternatives to conventional synthetic polymers for mitigating environmental pollution. In this study, lignin (lig), a natural biopolymer generated from agricultural waste (apricot stones), and chitosan (Cs) were combined to create biocomposite films. Multi-walled carbon nanotubes (MWCNTs), starch (st), and polyethylene glycol (PEG) were blended with the chitosan/lignin (Cs/lig) biocomposite materials, respectively, and cast to produce films. Various analytical techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and BET investigations were employed for a comprehensive characterization of the produced biocomposite films and to determine their effectiveness as adsorbents in sequestering Cr(VI) ions from water. The findings indicated that the optimal pH value was 2, and the highest removal (%) of Cr(VI) ions among the prepared samples was observed in the following order: Cs/lig/st (88%) &gt; Cs/lig (77.2%) &gt; Cs/lig/PEG (69.7%) &gt; Cs (65%) &gt; Cs/lig/MWCNTs (63%) after 50&#xa0;min of adsorption process. The incorporation of starch into the Cs/lig biocomposite resulted in two distinct peaks at 2θ (22.5° and 30–40°) in the XRD analysis for Cs/lig/st, indicating starch retrogradation, a process in which starch molecules re-associate. The analysis of adsorption kinetics and isotherms demonstrated that the adsorption process was best described by pseudo-second-order and Langmuir adsorption models. The intraparticle diffusion coefficient, <i>D</i><sub><i>i</i></sub>, ranged from 10<sup>−5</sup> to 10<sup>−9</sup> cm<sup>2</sup>.min<sup>−1</sup>, suggesting that intraparticle diffusion occurred in a process controlled by chemisorption. The findings add to the expanding research on biopolymer materials and their ability to tackle reusability and environmental pollution issues.</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

Biocomposite films based on chitosan and lignin integrated with starch, polyethylene glycol, and multi-walled carbon nanotubes for Cr(VI) adsorption from aqueous solutions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月6日

查看全文
  • Khadiga Mohamed Abas,
  • Amina Abdel Meguid Attia,
  • Mona Abdel Hamid Shouman

摘要

Considering natural biopolymers are renewable, biodegradable, and biocompatible, they hold great potential as alternatives to conventional synthetic polymers for mitigating environmental pollution. In this study, lignin (lig), a natural biopolymer generated from agricultural waste (apricot stones), and chitosan (Cs) were combined to create biocomposite films. Multi-walled carbon nanotubes (MWCNTs), starch (st), and polyethylene glycol (PEG) were blended with the chitosan/lignin (Cs/lig) biocomposite materials, respectively, and cast to produce films. Various analytical techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and BET investigations were employed for a comprehensive characterization of the produced biocomposite films and to determine their effectiveness as adsorbents in sequestering Cr(VI) ions from water. The findings indicated that the optimal pH value was 2, and the highest removal (%) of Cr(VI) ions among the prepared samples was observed in the following order: Cs/lig/st (88%) > Cs/lig (77.2%) > Cs/lig/PEG (69.7%) > Cs (65%) > Cs/lig/MWCNTs (63%) after 50 min of adsorption process. The incorporation of starch into the Cs/lig biocomposite resulted in two distinct peaks at 2θ (22.5° and 30–40°) in the XRD analysis for Cs/lig/st, indicating starch retrogradation, a process in which starch molecules re-associate. The analysis of adsorption kinetics and isotherms demonstrated that the adsorption process was best described by pseudo-second-order and Langmuir adsorption models. The intraparticle diffusion coefficient, Di, ranged from 10−5 to 10−9 cm2.min−1, suggesting that intraparticle diffusion occurred in a process controlled by chemisorption. The findings add to the expanding research on biopolymer materials and their ability to tackle reusability and environmental pollution issues.