Scholarlink

<p>In this study, coffee grounds, an abundant waste product from the commercial and industrial processing of coffee beans, were utilized as a carbon-rich precursor for the production of eco-friendly adsorbents. Activated carbons (ACs) were produced through microwave pyrolysis, thermal activation, and chemical activation with Zn(CH<sub>3</sub>CO<sub>2</sub>)<sub>2</sub>/ZnCl<sub>2</sub>. The prepared adsorbents were characterized using various analytical techniques, including nitrogen adsorption/desorption isotherms (Brunauer–Emmett–Teller), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDS), and determination of the point of zero charge (pHpzc). The adsorbents were evaluated for their effectiveness in removing the indigo blue (IB) dye, targeting denim textile industry wastewater treatment. Thermodynamic, kinetic, and isothermic parameters were calculated to provide a comprehensive understanding of the mechanisms involved in the adsorption process. The activated carbon produced using a carbonization process with intermittent and sequential times of 3, 2, and 1&#xa0;min and a coffee grounds/Zn(CH<sub>3</sub>CO<sub>2</sub>)<sub>2</sub>/ZnCl<sub>2</sub> activation ratio of 2:2:1 exhibited the best performance. Adsorption of indigo blue showed the maximum Langmuir adsorption capacity of 181.82&#xa0;mg&#xa0;g<sup>−1</sup>, aligning well with pseudo-second-order kinetic models. Thermodynamic analysis revealed that the adsorption process of IB is favorable, spontaneous, and endothermic, suggesting a dominant chemisorption mechanism. Desorption studies demonstrated that ethanol achieved the highest desorption efficiency (87%). The reusability tests indicated their potential for continued use, maintaining efficiency for four cycles. Additionally, studies using real wastewater confirmed the promising applicability of these adsorbents for field applications, achieving a removal efficiency of 99.74% with the activated carbon.</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

Adsorbent derived from coffee waste biomass using microwave-assisted activation route for treating textile effluent containing indigo blue

  • 期刊论文

  • 发表日期：

    2025年2月17日

查看全文
  • Milla Araújo de Almeida,
  • Nicolas Perciani de Moraes,
  • Julio César Lourenço,
  • Robson da Silva Rocha,
  • Marcos Roberto de Vasconcelos Lanza,
  • Renata Colombo

摘要

In this study, coffee grounds, an abundant waste product from the commercial and industrial processing of coffee beans, were utilized as a carbon-rich precursor for the production of eco-friendly adsorbents. Activated carbons (ACs) were produced through microwave pyrolysis, thermal activation, and chemical activation with Zn(CH3CO2)2/ZnCl2. The prepared adsorbents were characterized using various analytical techniques, including nitrogen adsorption/desorption isotherms (Brunauer–Emmett–Teller), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDS), and determination of the point of zero charge (pHpzc). The adsorbents were evaluated for their effectiveness in removing the indigo blue (IB) dye, targeting denim textile industry wastewater treatment. Thermodynamic, kinetic, and isothermic parameters were calculated to provide a comprehensive understanding of the mechanisms involved in the adsorption process. The activated carbon produced using a carbonization process with intermittent and sequential times of 3, 2, and 1 min and a coffee grounds/Zn(CH3CO2)2/ZnCl2 activation ratio of 2:2:1 exhibited the best performance. Adsorption of indigo blue showed the maximum Langmuir adsorption capacity of 181.82 mg g−1, aligning well with pseudo-second-order kinetic models. Thermodynamic analysis revealed that the adsorption process of IB is favorable, spontaneous, and endothermic, suggesting a dominant chemisorption mechanism. Desorption studies demonstrated that ethanol achieved the highest desorption efficiency (87%). The reusability tests indicated their potential for continued use, maintaining efficiency for four cycles. Additionally, studies using real wastewater confirmed the promising applicability of these adsorbents for field applications, achieving a removal efficiency of 99.74% with the activated carbon.