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All Journal FLUIDA Jurnal Difusi Journal of Green Science and Technology
Dianty Rosirda Dewi Kurnia
Politeknik Negeri Bandung
Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Transportation

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Adsorption of Methylene Blue Using Activated Carbon Bioadsorbent Coffee Grounds and Reed Grass Without Flow Rate Irwan Hidayatulloh; Dianty Rosirda Dewi Kurnia; Heni Anggorowati; Emma Hermawati Muhari; Luthfiana Kharisma; Radianti Novita Sari; Tifa Paramitha; Rony Pasonang Sihombing
Fluida Vol. 17 No. 2 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i2.6269

Abstract

Methylene blue adsorption research has been conducted using bioadsorbents from activated carbon of coffee grounds and reeds. Coffee grounds and reeds contain carbon and cellulose that are effective for binding dyes. This study aims to determine the characteristics of activated carbon from coffee grounds and reeds based on SNI-06-3730-1995 and assess the color reduction of wastewater referring to the Decree of the Minister of Environment No. 51/MENLH/1995, which sets the maximum methylene blue content in industrial wastewater at 5-10 mg/L. The research method includes bioadsorbent preparation, characterization, and adsorption process with UV-Vis spectrophotometric analysis. Mass ratio variation was conducted on each adsorbent at each contact time variation and methylene blue concentration variation. The results of the analysis showed that the activated carbon of coffee grounds and reeds fulfills SNI-06-3730-1995 which is characterized by values that are below the maximum value in each parameter. The effectiveness of methylene blue adsorption by coffee grounds and reeds activated carbon reached 98.15% at a ratio of coffee grounds and reeds activated carbon 0:1 (w/w) for 120 minutes at a concentration of 25 mg/L. The adsorption capacity using the Freundlich isotherm method on reed activated carbon was 1.100 mg/g and coffee grounds activated carbon was 1.019 mg/g. The adsorption process of coffee grounds and reeds activated carbon has no effect on the carbon and cellulose structure of coffee grounds and reeds contained in activated carbon, namely O-H, C-H, C=C, and C=O.
POLBAN Chemical Engineering Community Empowerment at SMPN 15 Bandung Supporting Circular Economy Lidya Risang Ayu; Dianty Rosirda Dewi Kurnia; Rispiandi; Dian Ratna Suminar; Rony Pasonang Sihombing
Jurnal Difusi Vol. 9 No. 1 (2026): Jurnal Difusi
Publisher : Pusat Penelitian dan Pengabdian Masyarakat (P3M) Politeknik Negeri Bandung

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School waste management is a critical issue in Indonesia as it has not been prioritized effectively. Students generate approximately 25–100 grams of waste per day, potentially affecting environmental quality and public health. To address this issue, the Indonesian Ministry of Education and Culture introduced the Adiwiyata program in 2015 to encourage environmentally conscious schools. As part of the Tri Dharma of Higher Education, community service activities support knowledge transfer between universities and society to strengthen this program. This activity was conducted at SMPN 15 Bandung through demonstrations and counseling involving students and teachers, emphasizing circular economy principles and environmental empowerment. Ecoprint innovation introduced eco-friendly totebag coloring using natural plant pigments. Ecocraft activities promoted recycling through keychain production to increase material value. Additionally, ecofood innovation highlighted the utilization of watermelon rind, containing water, fiber, and bioactive compounds, as a value-added food product to reduce waste and improve economic potential.
Phosphate Reduction in Laundry Wastewater Using Activated Coffee Grounds and Fly Ash as Adsorbents Rony Pasonang Sihombing; Christianti Christianti; Nabila Dwi Nur Ramadhani; Nadya Zafirra Martadinata; Alfiana Adhitasari; Dianty Rosirda Dewi Kurnia
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10651

Abstract

The growth and development of the population have significantly accelerated economic progress within society. Consequently, many new businesses have emerged, including commercial laundry services. One of the substances found in laundry wastewater, phosphate can cause eutrophication, which disrupts the balance of aquatic ecosystems. One method that can be developed to address this issue is adsorption technology. The aim of this research was to lower the phosphat content and to meet the Regulation of the Minister of Environment of the Republic of Indonesia No. 5 of 2014. The increasing number of coffee shops generates coffee grounds that have the potential to be processed into activated carbon. Additionally, fly ash a by-product of coal combustion contains silica and can be used as an adsorbent. The activated carbon is activated using 0.1 N NaOH and combined with fly ash in various compositions: 2:8, 4:6, 5:5, 6:4, and 8:2. Besides the variation in composition, contact time is also varied 30 minutes, 60 minutes, 90 minutes, 120 minutes, and 150 minutes. The observed parameters include pH and phosphate concentration at each contact time. The research results show that the optimal composition is 0.2AC:0.8FA with the highest phosphate removal efficiency of 60.3% at 150 minutes contact time and a pH of 7.1. However, the final phosphate concentration has not yet met the quality standard of 2 mg/L set by the Regulation of the Minister of Environment of the Republic of Indonesia No. 5 of 2014.
Co-Authors Alfiana Adhitasari Christianti Christianti Emma Hermawati Muhari Hidayatulloh, Irwan Lidya Risang Ayu Luthfiana Kharisma Nabila Dwi Nur Ramadhani Nadya Zafirra Martadinata Radianti Novita Sari Rispiandi Rony Pasonang Sihombing Sihombing, Rony Pasonang Suminar, Dian Ratna Tifa Paramitha