Scholarlink

<p>Discarded cigarette butts represent one of the most abundant plastic wastes worldwide; nevertheless, their reuse as functional adsorbents remains underexplored. Here, we report a promising way to reutilize discarded cigarette butts as an adsorbent for Cr(VI) removal using surface functionalization with 5% (v/v) 3-aminopropyltriethoxysilane and 2.5% (v/v) glutaraldehyde. The functionalized butts completely removed 200&#xa0;mg L⁻<sup>1</sup> of Cr(VI) within 120&#xa0;h at pH 2.0 and 60&#xa0;°C, with a maximum capacity of 33.90&#xa0;mg g⁻<sup>1</sup>. The adsorption process fitted a pseudo-second-order model and a Freundlich isotherm well, indicating multilayer chemisorption. Scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM–EDS) images confirmed the morphological changes on the fibers of cigarette butts after surface functionalization and the accumulation of chromium within the fibers after adsorption. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) analyses demonstrated the active participation of ether, carbonyl, hydroxyl, and amine groups in both complexation and the reduction of Cr(VI) to Cr(III). A mechanistic scheme is proposed illustrating the adsorption–complexation–reduction pathway. The adsorbent retained ~ 70% removal efficiency over five regeneration cycles, demonstrating strong reusability. Comparative evaluation with other bio-adsorbents highlights the strength of this simple, waste-derived, chemically functionalized material for Cr(VI) remediation. This study presents a practical and scalable method for upcycling cigarette filter waste into an effective water treatment material.</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

Surface-functionalized cigarette butts as efficient adsorbents for Cr(VI) removal and mechanistic insights

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月5日

查看全文
  • Jittima Charoenpanich,
  • Prangtip Promma,
  • Natsamon Singha-art,
  • Chitchanok Tangnithiwat,
  • Chinnawut Pipatpanukul

摘要

Discarded cigarette butts represent one of the most abundant plastic wastes worldwide; nevertheless, their reuse as functional adsorbents remains underexplored. Here, we report a promising way to reutilize discarded cigarette butts as an adsorbent for Cr(VI) removal using surface functionalization with 5% (v/v) 3-aminopropyltriethoxysilane and 2.5% (v/v) glutaraldehyde. The functionalized butts completely removed 200 mg L⁻1 of Cr(VI) within 120 h at pH 2.0 and 60 °C, with a maximum capacity of 33.90 mg g⁻1. The adsorption process fitted a pseudo-second-order model and a Freundlich isotherm well, indicating multilayer chemisorption. Scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM–EDS) images confirmed the morphological changes on the fibers of cigarette butts after surface functionalization and the accumulation of chromium within the fibers after adsorption. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) analyses demonstrated the active participation of ether, carbonyl, hydroxyl, and amine groups in both complexation and the reduction of Cr(VI) to Cr(III). A mechanistic scheme is proposed illustrating the adsorption–complexation–reduction pathway. The adsorbent retained ~ 70% removal efficiency over five regeneration cycles, demonstrating strong reusability. Comparative evaluation with other bio-adsorbents highlights the strength of this simple, waste-derived, chemically functionalized material for Cr(VI) remediation. This study presents a practical and scalable method for upcycling cigarette filter waste into an effective water treatment material.