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<p>Water contamination is a serious global issue, and exploring efficient water purification methods is of significant importance to research community to achieve sustainable development goals (SDGs). Widely explored low-cost and environmentally beneficial technique is biosorption, which uses inexpensive materials to adsorb contaminants from the wastewater. Ionic liquids (ILs), a significant class of liquid organic salts with melting temperatures below 100&#xa0;°C, are composed of both organic and inorganic ion pairs bonded by weak electrostatic interactions. Recently, ILs have been employed to purify water both through extraction as well as adsorption techniques. This study explores, for the very first time, the effects of differently natured (acidic, basic, and neutral) ILs on the biosorption potentials of activated carbon of brewed tea that is a domestic food waste. Acidic IL-functionalized activated carbon (MAC-A) was found to be particularly effective in removing Orange G (OG) dye from the aqueous solutions. ILs are observed to enhance the structural properties of biosorbent by improving its morphology and reducing the crystallinity that in turn, helps in improved active sites. Biosorbent was performing best under mild conditions; room temperature, neutral pH, and fast sorption equilibrium (90&#xa0;min). The practical adsorption capacity of MAC-A for OG was 30&#xa0;mg/g, which is greater than many of the biomass-based biosorbents reported in the literature. The IL-functionalized MAC-A exhibited good recyclability up to the 3 runs. These facts mark the IL-functionalized MAC-A an appealing cost-effective choice for OG-contaminated wastewater treatment.</p>

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Ionic Liquid-Functionalized Activated Carbon of Brewed Tea Waste for Efficient Removal of Anionic Dye from Wastewater

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Nabeel Ahmed Chughtai,
  • Sadia Naz,
  • Muhammad Ayyaz,
  • Muhammad Akhtar,
  • Muhammad Ajaz Hussain,
  • Madeeha Batool,
  • Maliha Uroos

摘要

Water contamination is a serious global issue, and exploring efficient water purification methods is of significant importance to research community to achieve sustainable development goals (SDGs). Widely explored low-cost and environmentally beneficial technique is biosorption, which uses inexpensive materials to adsorb contaminants from the wastewater. Ionic liquids (ILs), a significant class of liquid organic salts with melting temperatures below 100 °C, are composed of both organic and inorganic ion pairs bonded by weak electrostatic interactions. Recently, ILs have been employed to purify water both through extraction as well as adsorption techniques. This study explores, for the very first time, the effects of differently natured (acidic, basic, and neutral) ILs on the biosorption potentials of activated carbon of brewed tea that is a domestic food waste. Acidic IL-functionalized activated carbon (MAC-A) was found to be particularly effective in removing Orange G (OG) dye from the aqueous solutions. ILs are observed to enhance the structural properties of biosorbent by improving its morphology and reducing the crystallinity that in turn, helps in improved active sites. Biosorbent was performing best under mild conditions; room temperature, neutral pH, and fast sorption equilibrium (90 min). The practical adsorption capacity of MAC-A for OG was 30 mg/g, which is greater than many of the biomass-based biosorbents reported in the literature. The IL-functionalized MAC-A exhibited good recyclability up to the 3 runs. These facts mark the IL-functionalized MAC-A an appealing cost-effective choice for OG-contaminated wastewater treatment.