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All Journal Jurnal Rekayasa Proses Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan The Journal of Pure and Applied Chemistry Research JURNAL INTEGRASI PROSES Jurnal Kimia Terapan Indonesia JMM (Jurnal Masyarakat Mandiri) Jurnal Teknologi Bahan Alam Jurnal Rekayasa Proses Molekul: Jurnal Ilmiah Kimia Jurnal Teknik Kimia Prosiding University Research Colloquium Jurnal Kimia dan Rekayasa Warta LPM Prosiding Seminar Nasional Unimus KOPEMAS Indonesian Journal of Islamic Economic Law JURNAL REKAYASA KIMIA & LINGKUNGAN
Emi Erawati
Universitas Muhammadiyah Surakarta
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Nursing Public Health Social Sciences Other

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Characterization of Activated Coconut Shell Charcoal as a Zinc Absorbent for Used Oil Lubricant Emi Erawati; Haryanto Haryanto; Neysa Wirantika Astuti; Annida Mitha Prasetyanti
Jurnal Rekayasa Kimia & Lingkungan Vol 15, No 2 (2020): Jurnal Rekayasa Kimia & Lingkungan (December, 2020)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v15i2.13589

Abstract

Lubricating oil is classified as B3 waste (hazardous and toxic waste). In the lubricating oil consists of zinc waste which is very dangeraous for healt and environment. So that to handle lubricating oil is used the adsorption method using coconut shell as adsorbent. This study aims to determine the efficiency of zinc adsorption on lubricating oil with stirring speed, percent solvent, mesh size, and mass of adsorbent variation; to learn the equibilium equation of adsorpsion of Zn metal ion on the activated carbon of coconut shell charcoal using Freundlich and Langmuir equilibirium; and to calculate adsorbtion kinetic constanta using the pseudo first model or pseudo second order kinetics approach. Coconut shells was heated at a temperature of 300C for 1 hour for the driving process . Furthermore, charcoal was soaked in 25% HCl for 18 hours. After being neutralized to pH 7, the charcoal was activated for 3 hours at a temperature of 500C and stored in a closed place. Coconut shell adsorbent and H2SO4 solvent were put into a beaker glass containing 400 ml of lubricating oil and stirred for 2 hours, every 30 minutes intervals were taken 50 ml to destruction for 2 hours with 68% HNO3. The zinc concentration before and after adsorption were measured using AAS. This study uses the Langmuir isotherm and Freundlich Isotherm models. The greatest efficiency of zinc adsorption with solvent percent variation 0.5% is 95.0567% and 99.9375% in adsorbent mass variation of 10 gram.
PIROLISIS CAMPURAN LIMBAH PLASTIK JENIS POLIETILENA BERDENSITAS TINGGI (HDPE) DAN POLIPROPILENA (PP) DENGAN BENTONIT SEBAGAI KATALIS Emi Erawati; Farid Nur Huda
JURNAL INTEGRASI PROSES Vol 12, No 1 (2023)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/jip.v12i1.16631

Abstract

Studi ini bertujuan untuk mempelajari pengaruh persen berat katalis dan berat campuran bahan terhadap yield dan komposisi hasil pirolisis sampah polipropilen (botol air mineral) dan polietilena berdensitas tinggi (tutup botol air mineral). Pirolisis dilakukan dengan variasi jumlah katalis 0, 5, 10, 15, dan 20 %b/b, serta variasi berat campuran bahan 50, 60, 70, 80, dan 90 %b/b. Hasil yield cair, padat, dan gas tertinggi pada variasi jumlah katalis secara berurutan adalah 73,26; 26,4; dan 0,34%. Pada variasi berat campuran bahan diperoleh yield cair, padat, dan gas tertinggi pada 75,42; 21,6; dan 2,98 %. Hasil analisis gas chromatography-mass spectrometry (GCMS) didapatkan %area tertinggi pada senyawa 1,3,5,7 Cyclooctatetraene sebesar 71,61%.
Effectiveness of Halal Traceability and Self-Declared Certification on Indonesian MSMEs Performance Sadiyah, Siti; Erawati, Emi
Indonesian Journal of Islamic Economic Law Vol. 1 No. 2 (2024): Indonesian Journal of Islamic Economic Law
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/ijoel.v1i2.4816

Abstract

This study aims to examine in depth the effectiveness of halal tracea-bility in Indonesia and identify the impact of self-declared halal certifi-cation on the performance of small and medium-sized enterprises (SMEs) in the country. The research method used is qualitative, which is reinforced by statistical analysis through survey data from the Popu-lix application as well as a comprehensive literature review. Data anal-ysis was conducted through various techniques, including regression tests, correlation tests, chi-square tests, and content analysis. The re-search findings confirm that the effectiveness of the halal tracking sys-tem significantly contributes to improving the resilience and competi-tiveness of MSMEs. Moreover, self-declared halal certification has been proven to increase consumer confidence in halal products and their integrity. This research makes an important contribution by high-lighting the urgency of integrating efficient halal supply chain man-agement practices, including reliable tracking systems and credible cer-tification. Furthermore, this research underscores the necessity of en-hancing consumer awareness of halal products, thereby facilitating in-formed purchasing decisions and fostering the growth of a more resili-ent halal ecosystem in Indonesia.
The Effect of Temperature and Solvent Concentration on Chemical and Physical Properties of Carrageenan from Gracilaria gracilis Erawati, Emi; Fatoni, Rois; Hamid, Hamid; Noviasari, Tri
The Journal of Pure and Applied Chemistry Research Vol. 14 No. 1 (2025): Edition January-April 2025
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2025.014.01.695

Abstract

Carrageenan is a polysaccharide extracted from seaweed sap using either air or an alkaline solution, such as Gracilaria gracilis. It functions as a thickening, emulsifying, suspending, and stabilizing agent. This paper reports the effect of KOH concentrations and temperatures on the extraction, in addition to determining the physical and chemical properties of the seaweed. A dried G. gracilis was soaked in distilled water for 24 hours and heated at 85°C for two hours. It was found the fat content was 3.56%, protein content 17.68%, moisture content 1.984%, and ash content of 26.547%. The highest values for water holding capacity (WHC) were 4.07 g/g, oil holding capacity (OHC) 3.539 g/g, swelling capacity (SC) at 1.894 mL/g, solubility index (SI) at 10.843 g/100g, emulsifying activity (EA) at 73.483%, and pH at 7.520.
Co-Authors Ahmad Yusuf Haidar Almira Permata Anas Tasya Sekartaji Anisa Ur Rahmah Anjani Ayundha Widya Lestari Annida Mitha Prasetyanti Annisa Ayu Ilma Ardiansyah Fernando Awanda Chairunnisa’ Subarno Cindy Amelia Sari Dhea Marta Rizkiana Putri Ekta Firdausi Nur Afifah Elsa Mariza Eva Rahmalia Helmy Helmy Farid Nur Huda Hamid Hamid Hamid Hamid Haryanto Haryanto Herlambang Prima Yoga Herlambang Prima Yoga Imam Maulana Inaya Nandadias Kesi Marfiana Krisna Wisnu Wardhana Muhammad Falakhuddin Muhammad Raihan Naufal Muzakar Isa Naura Nazhifah Neysa Wirantika Astuti Noviasari, Tri Nur Dayanti Panji Rasma Setiawan Panut Mulyono Rasma Panji Setiawan Ririn Sanggar Wati Rita Wijayanti Rois Fatoni Rossi Al Ahmad Safira Rijka Ardima Safira Rijma Ardima Setyo Nurwaini Siti Sadiyah Syahrani Shabrina D Syahrani Shabrina D Tita Agustin K Wahyudi Budi Sediawan Wahyudi Budi Sediawan Zada Almira Fitri Zada Almira Fitri ‘Afiful Fida’ Listiawan