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This study examines the use of coffee dregs waste as biosorbents of Cu(II) and Ag(I). Coffee dregs waste still contains a high level of carbon and cellulose for biosorbents production. The production process was started with charcoal activation using H3PO4. The batch method was applied by variations of contact time, the mass of the biosorbent, and the initial concentration of metal ions. The results showed that Cu(II) and Ag(I) were optimally adsorbed at pH 6 and 4, respectively. The amount of adsorbed metal ions increased with adsorption contact time. The adsorption process of both metal ions reaches stability within 60 min and the optimum biosorbent mass is 1 g. Isothermal adsorption studies show that Cu(II) adsorption tends to follow Langmuir isotherm with an adsorption energy of 31.42 kJ/mol and Ag(I) adsorption follows Freundlich isotherms with an adsorption energy of 27.74 kJ/mol. Based on the results, the interaction between metal ions and adsorbents is a chemical adsorption process and coffee dregs charcoal has the potential to adsorb Cu(II) and Ag(I) metal ions.

The study demonstrated the potential of H3PO4-activated coffee dregs charcoal as a biosorbent for Cu(II) and Ag(I).Optimal adsorption occurred within 60 minutes, with 1 g of biosorbent proving most effective.The adsorption process for Cu(II) followed the Langmuir isotherm, while Ag(I) followed the Freundlich isotherm, indicating a chemical adsorption mechanism.

Penelitian lebih lanjut perlu dilakukan untuk menguji efektivitas biosorben ampas kopi dalam kondisi lingkungan yang lebih kompleks, seperti keberadaan ion-ion pesaing dan variasi suhu. Studi komparatif dengan jenis biosorben lain, termasuk yang dimodifikasi secara kimia, dapat dilakukan untuk mengidentifikasi keunggulan dan keterbatasan ampas kopi sebagai bahan adsorben. Pengembangan sistem adsorpsi berkelanjutan, misalnya dengan mengintegrasikan biosorben ampas kopi ke dalam sistem filtrasi air limbah skala kecil, dapat menjadi arah penelitian yang menjanjikan untuk aplikasi praktis. Eksplorasi lebih lanjut mengenai mekanisme adsorpsi, termasuk identifikasi gugus fungsi spesifik yang berperan dalam interaksi dengan ion logam, akan memberikan pemahaman yang lebih mendalam tentang kinerja biosorben ini. Penelitian ini diharapkan dapat memberikan solusi inovatif dan ramah lingkungan untuk mengatasi masalah pencemaran logam berat di lingkungan.

  1. Activated Charcoal from Coffee Dregs Waste as an Alternative Biosorbent of Cu(II) and Ag(I) | Prabawati... journal.ugm.ac.id/ijc/article/view/83269Activated Charcoal from Coffee Dregs Waste as an Alternative Biosorbent of Cu II and Ag I Prabawati journal ugm ac ijc article view 83269
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