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<p>In this work, layered double hydroxide modified with lignin (NiAl-Lignin) was prepared by the co-precipitation synthesis method and characterized by BET, XRD, FESEM-EDS, and FTIR, demonstrating the successful preparation of NiAl-Lignin. The adsorbents are used for selective adsorption of cationic dyes in aqueous solution. The interaction between functional groups on malachite green and adsorption sites on the adsorbent surface is stronger and more specific, leading to higher selectivity than methylene blue and rhodamine B. The result of the correlation coefficient on malachite green adsorption suggested pseudo-second-order kinetic and Langmuir isotherm. The maximum malachite green’s adsorption capacities by NiAl, lignin, and NiAl-lignin were 156.250, 142.857, and 175.439&#xa0;mg/g, respectively. The percentage of MG adsorbed in the first cycle was an impressive 94.27%. Even as the cycles progressed, the efficiency reduction remained below 10% until the fourth cycle (pH = 4, t = 2&#xa0;h, T = 303&#xa0;K, <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42250_2025_1241_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:{C}_{0}\)</EquationSource> </InlineEquation> = 30&#xa0;mg/L). NiAl-Lignin demonstrated potential as a candidate adsorbent for selective adsorption of malachite green on cationic dyes from wastewater.</p>

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Lignin-NiAl Layered Double Hydroxide Composite Adsorbent for Selective Removal of Malachite Green from Aqueous Solutions of Cationic Dyes

  • 期刊论文

  • 发表日期：

    2025年3月4日

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  • Nur Ahmad,
  • Fitri Suryani Arsyad,
  • Idha Royani,
  • Yulizah Hanifah,
  • Aldes Lesbani

摘要

In this work, layered double hydroxide modified with lignin (NiAl-Lignin) was prepared by the co-precipitation synthesis method and characterized by BET, XRD, FESEM-EDS, and FTIR, demonstrating the successful preparation of NiAl-Lignin. The adsorbents are used for selective adsorption of cationic dyes in aqueous solution. The interaction between functional groups on malachite green and adsorption sites on the adsorbent surface is stronger and more specific, leading to higher selectivity than methylene blue and rhodamine B. The result of the correlation coefficient on malachite green adsorption suggested pseudo-second-order kinetic and Langmuir isotherm. The maximum malachite green’s adsorption capacities by NiAl, lignin, and NiAl-lignin were 156.250, 142.857, and 175.439 mg/g, respectively. The percentage of MG adsorbed in the first cycle was an impressive 94.27%. Even as the cycles progressed, the efficiency reduction remained below 10% until the fourth cycle (pH = 4, t = 2 h, T = 303 K, \(\:{C}_{0}\) = 30 mg/L). NiAl-Lignin demonstrated potential as a candidate adsorbent for selective adsorption of malachite green on cationic dyes from wastewater.