Scholarlink

<p>Developing sustainable, biodegradable, cost-effective, robust, and recyclable catalysts for treating various hazardous organic compounds is still challenging. Herein, the biosynthesis of silver nanoparticles (AgNPs) mediated by durian shell (DS) extracts as a reducing and stabilizing agent decorated on a three-dimensional cellulose–chitin aerogel composite supports (ACeCh) for reducing methyl orange (MO) with the presence of NaBH<sub>4</sub> (NB). More specifically, the DS residue after extracting was used to isolate cellulose (Ce), while the shrimp shell (SS) was used as a precursor for synthesizing Ch. These components were combined to create a novel green ACeCh support with an exceptionally high porosity (98.98%) and a low density (0.0155&#xa0;g/cm<sup>3</sup>) that uniformly disperses AgNPs, boosts catalytic performance, and makes the catalyst obtained accessible for recovery and reuse. The catalysts’ physicochemical properties were characterized using XRD, EDS, FTIR, SEM, HRTEM, SAED analysis techniques, and BET measurement. The AgNPs were found to possess an average size of 16.95 ± 10.11&#xa0;nm and were uniformly distributed on the surface of ACeCh. Strikingly, the catalytic activity of the 2.5Ag/ACeCh(4-1-2.0) composite at a AgNPs content of 2.5% under ideal reaction conditions, in which the catalyst quantity was 1.00&#xa0;g/L, and the MO to NB molar proportion was 1:250, showed MO conversion efficiency of approximate 96.0% after 30&#xa0;min, correlating with the first-order rate constant <i>k</i><sub>app</sub> of 0.118&#xa0;min<sup>−1</sup>. In the same conditions, the appropriate catalyst demonstrated superior catalytic efficiency in reducing various organic contaminants such as 2-nitrophenol (2-NP), 3-nitrophenol (3-NP), and 4-nitrophenol (4-NP). After five reaction cycles via vacuum filtering from the reaction solution in less than 10&#xa0;s, a nearly 85% conversion is still attained, demonstrating the catalytic sample’s stability.</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 to a Recyclable and Robust Catalyst: Nanosilver/Cellulose–Chitin Aerogel Composite Derived from Durian and Shrimp Shells to Reduce Hazardous Organic Compounds

  • 期刊论文

  • 发表日期：

    2025年5月29日

查看全文
  • Trong Nguyen Le,
  • Thi Ngoc Linh Nguyen,
  • Thi Be Ta Truong,
  • Thanh Gia-Thien Ho,
  • Tri Nguyen

摘要

Developing sustainable, biodegradable, cost-effective, robust, and recyclable catalysts for treating various hazardous organic compounds is still challenging. Herein, the biosynthesis of silver nanoparticles (AgNPs) mediated by durian shell (DS) extracts as a reducing and stabilizing agent decorated on a three-dimensional cellulose–chitin aerogel composite supports (ACeCh) for reducing methyl orange (MO) with the presence of NaBH4 (NB). More specifically, the DS residue after extracting was used to isolate cellulose (Ce), while the shrimp shell (SS) was used as a precursor for synthesizing Ch. These components were combined to create a novel green ACeCh support with an exceptionally high porosity (98.98%) and a low density (0.0155 g/cm3) that uniformly disperses AgNPs, boosts catalytic performance, and makes the catalyst obtained accessible for recovery and reuse. The catalysts’ physicochemical properties were characterized using XRD, EDS, FTIR, SEM, HRTEM, SAED analysis techniques, and BET measurement. The AgNPs were found to possess an average size of 16.95 ± 10.11 nm and were uniformly distributed on the surface of ACeCh. Strikingly, the catalytic activity of the 2.5Ag/ACeCh(4-1-2.0) composite at a AgNPs content of 2.5% under ideal reaction conditions, in which the catalyst quantity was 1.00 g/L, and the MO to NB molar proportion was 1:250, showed MO conversion efficiency of approximate 96.0% after 30 min, correlating with the first-order rate constant kapp of 0.118 min−1. In the same conditions, the appropriate catalyst demonstrated superior catalytic efficiency in reducing various organic contaminants such as 2-nitrophenol (2-NP), 3-nitrophenol (3-NP), and 4-nitrophenol (4-NP). After five reaction cycles via vacuum filtering from the reaction solution in less than 10 s, a nearly 85% conversion is still attained, demonstrating the catalytic sample’s stability.