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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Riset Kimia ALCHEMY Jurnal Penelitian Kimia Communications in Science and Technology JURNAL ANALIS LABORATORIUM MEDIK Unri Conference Series: Community Engagement JURNAL KIMIA SAINTEK DAN PENDIDIKAN Jurnal Masyarakat Mengabdi Nusantara BATOBO: Jurnal Pengabdian Kepada Masyarakat Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran JES-TM Social and Community Service
Maria Peratenta
Universitas Riau
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Other

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Optimizing Heavy Metal Reduction in Chemical Industry Waste: A Comprehensive Response Surface Methodology Approach for Enhanced Environmental Sustainability Maria Peratenta Sembiring; Desi Heltina; Chairul Chairul; Sri Rejeki Muria; Melisa Phebeyola Estheria Tarigan
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 2 (2025): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.2.98970.296-304

Abstract

This study investigates the optimization of heavy metal reduction in solid waste from the chemical industry using Response Surface Methodology (RSM). The Box-Behnken design was employed to optimize the extraction parameters for removing Co, Cu, Pb, and Cr using NaCl as a solvent with Ethylenediaminetetraacetic acid (EDTA) as a chelating agent. The effects of EDTA:Fly Ash ratio, mixing duration, and extraction temperature were evaluated using induced coupled plasma (ICP) and Scanning Electron Microscope and Energy-Dispersive X-ray (SEM/EDS) analysis. NaCl proved effective in reducing Co, Cr, and Pb levels. Optimal conditions for NaCl treatment were identified as an EDTA:Fly Ash ratio of 2:1, 3 hours of mixing time, and an extraction temperature of 52.3 ℃, resulting in a 92.3% total metal reduction. ANOVA results confirmed the statistical significance of the model, with high R² values (0.932 – 0.991) for all metals. The EDTA:Fly Ash ratio and its interaction with mixing duration were found to be the most influential factors in the process. The study demonstrates the effectiveness of RSM in optimizing heavy metal reduction processes and provides insights for improving waste management practices in the chemical industry. The findings highlight the importance of process parameter optimization in enhancing the efficiency of heavy metal removal from industrial solid waste.
Fabrication and Photocatalytic Performance of ZnO-Biochar Composites for Eliminating Dye Waste Desi Heltina; Danil Yoselino; Nabellia; Agustina Dumaria; Khairati Amila; Komalasari; Maria Peratenta Sembiring; Amun Amri; Zhong Tao Jiang
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1795

Abstract

The synthesis of the ZnO-biochar composite from palm kernel shell biomass waste has been accomplished through the utilization of thesolvothermal method, yielding a satisfactory outcome. The resulting composite, a combination of ZnO and biochar, has been utilized in the degradation of methylene blue waste compounds. The objective of this research is to synthesize ZnO-biochar composites from palm shells, and to determine the optimal solvothermal temperature and duration. This research was initiated with the preparation of palm shells into biochar. Subsequently, the ZnO-biochar composite was synthesized with variable solvothermal temperatures and solvothermal times. The ZnO-biochar composite was characterized using analytical techniques including SEM-EDX, FT-IR, XRD, BET and UV-vis DRS. The most effective degradation of methylene blue was exhibited by the ZnO-biochar composite sample synthesized at a solvothermal temperature of 180 ̊C and a solvothermal time of 10 hours, achieving a degradation of 88.29%. The enhanced photodegradation performance of this composite sample is attributed to its high surface area, capacity for visible light absorption, and the dimensions of the active crystals, which can account for the high performance of the ZnO-biochar composite for photocatalytic degradation.
Koh Catalyst Concentration and Stirring Speed in The Transesterification Process on Biodiesel Yield from Spent Coffee Grounds Oil Desi Heltina; Fadrian Oktori; Amun Amri; Agustina Dumaria; Maria Peratenta Sembiring
JST (Jurnal Sains dan Teknologi) Vol. 15 No. 1 (2026): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jst-undiksha.v15i1.92848

Abstract

Coffee grounds have a fairly high oil content in the seeds of around 15-20% which has great potential to be used as raw material for making biodiesel. This study aims to determine the physical characteristics of coffee grounds biodiesel; and to determine the effect of stirring speed, amount of catalyst and reaction time on the yield of coffee grounds biodiesel. The type of research on biodiesel production from coffee grounds waste is quantitative. The data collection method is carried out by experimenting on biodiesel that has been obtained from coffee grounds waste oil on the concentration of KOH catalyst, stirring speed and reaction time. After the required data has been collected, an analysis is carried out using a descriptive and analytical case study method. The result of the study obtained the best condition, namely at a KOH catalyst concentration of 3% wt oil, and a stirring speed of 800 rpm, a biodiesel yield of 30,19%. So it can be concluded that coffee grounds oil biodiesel has been successfully obtained and has met the quality standards of ASTM D6751 and EN 14214. The yield of biodiesel produced increased along with the increasing transesterification reaction time. GC-MS analysis showed that coffee grounds oil biodiesel was mostly composed of linoleic acid and palmitic acid. The implications of this research can be used in the development of further research related to innovations in improving environmentally friendly fuels based on organic waste.
Co-Authors Agustina Dumaria Agustina Dumaria Alhabsy Affif Amun Amri Annisa Ulhasanah Aqilla Cahyani Azhari, Ayu Chairul Chairul Chairul Chairul Chairul Chairul Chairul Chairul, Chairul Danil Yoselino Desi Heltina Deviona Dini Aulia Sari Ermal Elia Simanjuntak Evelyn Evelyn Fadrian Oktori Fauziyah, Hidayatul Fesya Putri, Andini Fitri Zulva Hasanah Hari Rionaldo Hasby Herdinasrul Khairati Amila Khoirul Amru Nst, Khoirul Amru Komalasari Komalasari Komalasari Lisa Legawati M. Iwan Fermi Melisa Phebeyola Estheria Tarigan Misrulina Misrulina Nabellia Nirwana Nirwana Nurul Azizah Rahmi Adisti Rahmi Ayuni Fuadi Rizaldi Saputra Rozanna Sri Irianty Sherly Fitri Rahmadhani Silaban, Kardiman Silvia Reni Yenti Sri Helianty Sri Rejeki Muria Suhendri Suhendri Syarfi Daud Tao Jiang, Zhong Tarigan, Melisa Phebeyola E. Winarto Tarigan Yolanda, Yogi Yusnimar Sahan Z Zulfansyah Zelfira, Afragenia Zhong Tao Jiang Zulfansyah Zulfansyah Zulfansyah Zulfansyah Zulfansyah Zuqni Meldha