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All Journal KOVALEN: Jurnal Riset Kimia FLUIDA Fullerene Journal of Chemistry International Journal of Applied Technology Research Jurnal Rekayasa Proses Sainteknol : Jurnal Sains dan Teknologi Journal of Green Science and Technology
Unung Leoanggraini
Politeknik Negeri Bandung
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Study on the Effectiveness of H₂SO₄ Activated Coffee Grounds and Imperata cylindrica Bioadsorbents for Methylene Blue Adsorption Unung Leoanggraini; Tifa Paramitha; Rahma Ardelia Raissa; Mutiara Nur Annisa; Muhammad Salman Alfarisi; Radianti Novita Sari; Rony Sihombing
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.63663

Abstract

Textile wastewater with methylene blue dye causes serious environmental issues because of its toxicity, persistence, and negative effects on aquatic life. Using agricultural waste as bioadsorbents provides a sustainable and low-cost way to remove dye from wastewater. The goal of this study was to assess how effective H₂SO₄-activated bioadsorbents made from coffee grounds and Imperata cylindrica are for methylene blue adsorption in batch systems. We prepared the bioadsorbents by carbonizing them at 450°C, followed by chemical activation with 2 M sulfuric acid. We characterized them using FTIR and SEM to study functional groups and surface shape. We conducted batch adsorption experiments by changing the adsorbent mass (0.15–0.3 g), contact time (30–120 minutes), and methylene blue concentration (10–100 mg/L). Langmuir and Freundlich isotherm models were used to evaluate the adsorption behavior. The results showed that activated coffee grounds and Imperata cylindrica had improved porosity and changes in functional groups after activation. The best adsorption conditions were found with an adsorbent mass of 0.3 g, a contact time of 120 minutes, and a methylene blue concentration of 10 mg/L, reaching an adsorption efficiency of up to 97.498%. The adsorption process fit the Langmuir isotherm model better, with maximum adsorption capacities of 42.735 mg/g for coffee grounds and 13.210 mg/g for Imperata cylindrica. These findings suggest that coffee grounds and Imperata cylindrica are promising, cost-effective bioadsorbents for removing methylene blue in textile wastewater treatment.
Co-Authors Aji, Restu Alfariz Dwi Pradana Alfiana Adhitasari Bambang Soeswanto Bambang Soeswanto Belva Chiquita Clarisa, Shintiya Dianty Rosirda Dewi Kurnia Fania Hidayati Fatah, Khalaida Fania Ghaniari Putri Gunawan, Sinna Chaerunnabila Hariyadi, Tri Holis Muhlis Irianto, Indra Iwan Ridwan Jayanti, Retno Dwi Khumaira Maulani Wijaya Luh Putu Irma Sridewi Yogeswari Marlina, Ari Mentik Hulupi Muhammad Salman Alfarisi Muhari, Emma Hermawati Mutiara Nur Annisa Ngatin, Agustinus Ninik Lintang Edi Wahyuni Nispi Yuliani Nugraha, Ganjar Nurcahyo Paramitha, Tifa Permanasari, Ayu Ratna Putri, Alifhah Ananda Radianti Novita Sari Rahma Ardelia Raissa Renata Naomi Cinta Sedjati Robby Sudarman rony sihombing Samuel Samuel Sarip, Fahmi Haddad Sihombing, Rony Sihombing, Rony Pasonang Teguh Taufiqurohim Tri Hariyadi Trirahayu, Dhyna Analyes Yunus Tonapa Sarungu Yusuf, Yusmardhany