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<p>This study optimizes polyethylenimine (PEI) impregnation on powdered activated carbon (PAC) to maximize adsorption of the anionic dye Reactive Yellow 2 (RY2). Three factors, namely PEI molecular weight (600, 800, 1200, 10,000 and 70,000&#xa0;g mol<sup>−1</sup>), PEI content (0.1–10&#xa0;wt.%), and impregnation stirring speed (0–200&#xa0;rpm), were systematically evaluated in triplicate. Under optimal conditions (PEI Mw = 800&#xa0;g&#xa0;mol<sup>−1</sup>, PEI content = 1.0&#xa0;wt.%, stirring = 40&#xa0;rpm), PEI-impregnated PAC achieved a maximum adsorption capacity of 477.02&#xa0;mg&#xa0;g<sup>−1</sup>, which is 7.4-fold higher than raw PAC (64.13&#xa0;mg&#xa0;g<sup>−1</sup>). FT-IR, BET, FE-SEM/EDS, and zeta potential analyses showed that although PEI impregnation reduced surface area, the introduced amine groups increased the surface charge by + 52.64&#xa0;mV at pH 2, driving the enhanced adsorption. These results demonstrate that PEI-impregnated activated carbon is a strong and efficient adsorbent for RY2 removal in textile wastewater treatment.</p>

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Polyethylenimine-Impregnated Powdered Activated Carbon for Efficient Removal of Reactive Yellow 2 from Aqueous Solutions

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Su Bin Kang,
  • Byeong-Chan Min,
  • Kwang-Il Go,
  • Yong Li,
  • Yeoung-Sang Yun,
  • Sung Wook Won

摘要

This study optimizes polyethylenimine (PEI) impregnation on powdered activated carbon (PAC) to maximize adsorption of the anionic dye Reactive Yellow 2 (RY2). Three factors, namely PEI molecular weight (600, 800, 1200, 10,000 and 70,000 g mol−1), PEI content (0.1–10 wt.%), and impregnation stirring speed (0–200 rpm), were systematically evaluated in triplicate. Under optimal conditions (PEI Mw = 800 g mol−1, PEI content = 1.0 wt.%, stirring = 40 rpm), PEI-impregnated PAC achieved a maximum adsorption capacity of 477.02 mg g−1, which is 7.4-fold higher than raw PAC (64.13 mg g−1). FT-IR, BET, FE-SEM/EDS, and zeta potential analyses showed that although PEI impregnation reduced surface area, the introduced amine groups increased the surface charge by + 52.64 mV at pH 2, driving the enhanced adsorption. These results demonstrate that PEI-impregnated activated carbon is a strong and efficient adsorbent for RY2 removal in textile wastewater treatment.