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All Journal Alotrop Jurnal Pendidikan dan Ilmu Kimia BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Al-Kimia JMM (Jurnal Masyarakat Mandiri) Martabe : Jurnal Pengabdian Kepada Masyarakat Fullerene Journal of Chemistry Gema Wiralodra Journal of Appropriate Technology for Community Services Jurnal Jejaring Matematika dan Sains Konservasi Hayati Yumary: Jurnal Pengabdian kepada Masyarakat Jurnal Insan Farmasi Indonesia Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Nanggroe: Journal Of Scholarly Service Nanggroe: Journal of Scholarly Service Socius: Social Sciences Research Journal Indonesian Journal of Chemical Science Jurnal Bioteknologi & Biosains Indonesia (JBBI) Welfare: Jurnal Pengabdian Masyarakat Jurnal Penelitian Hasil Hutan Jurnal Bioteknologi & Biosains Indonesia
Oksal, Efriyana
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Journal : Al-Kimia

 1 
The Potential of Jackfruit Wood as Activated Carbon for Adsorption of Heavy Metal Mercury (Hg) through Pyrolysis Method Zimon Pereiz; Chuchita; Oksal, Efriyana; Maya Sylvani, Miranti; Irawan, Ahmad; Pebriyanto, Yunus; Hairiah, Rusliananur; Eka Jaya Prastiti, Arini; Berlisnora Dasilva, Caroline; Anatasya, Violina; Prisnanda, Risky
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Water pollution caused by heavy metal mercury is a serious problem today. This study aims to utilise jackfruit wood waste as a natural adsorbent in overcoming the problem of water pollution due to heavy metal mercury. The methods in this research include jackfruit wood preparation, hydrochar synthesis through pyrolysis, hydrochar activation, wastewater preparation, batch adsorbent optimum conditions, and dynamic adsorption process (Fixed-Bed Column). The results showed that the optimum adsorption condition was reached at 0.4 M HCl concentration, pH 3 and 80minutes contact time. The study also showed that the adsorption kinetics followed a second-order pseudo model with a rate constant of 1.712 x 10-2 g/mg.min. The research data also showed conformity with the Langmuir isotherm model, with an adsorption capacity of 63.036 mg/g. The results of this study prove that jackfruit wood waste is effectively used as raw material for making activated carbon for wastewater treatment applications in removing heavy metal mercury.
Isolation and Characterization of Amylolytic Bacteria From Peatlands Area in Central Kalimantan Nafisah, Zahrotun; Riana Dewi, Syahrani; Ayu Andhita, Naswa; Elya Resha, Enjel; Oksal, Efriyana; Ayu Pratika, Remi; Hermayantiningsih, Dwi
Al-Kimia Vol 13 No 1 (2025): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Peatlands in Central Kalimantan, Indonesia, are ecologically significant due to their acidic, organic-rich conditions, yet their microbial communities remain underexplored, particularly regarding their enzymatic potential. This study aimed to isolate and characterize amylolytic bacteria from peat soil collected at a depth of 143–150 cm in the LAHG CIMTROP area of Central Kalimantan. A total of 44 bacterial isolates were obtained using serial dilution and the gridding method. Screening for amylase activity identified isolate ENS31 as having the highest activity, shown by a clear halo on starch agar. ENS31 was further subjected to biochemical characterization and enzyme activity assays. The amylase enzyme exhibited optimal activity at pH 7 and 50°C, with a specific activity of 3.5 U/mg, and retained activity up to pH 12 (2 U/mg). These results indicate that ENS31 produces an enzyme stable in alkaline conditions despite originating from an acidic environment, demonstrating potential for industrial applications requiring pH and temperature-tolerant biocatalysts. This study contributes to understanding the functional diversity of peatland microbes and highlights tropical peat ecosystems as promising sources of novel enzymes.  
Co-Authors A, Abdullah A, Anjelika Afli, Febrianto Ahmad Irawan, Ahmad Ahmad Rifai Alfanaar, Rokiy Alpian Ananda, Lintang Tri Anatasya, Violina Apriyanti, Mauliya Ariska, Risya Atviaputra, Alvin Sienna Ayu Andhita, Naswa Ayu, Yulia Agustina Ayuchecaria, Noverda Berlisnora Dasilva, Caroline C, Chuchita Catur Prasetyo, Debby Chuchita Chuchita, Chuchita Damayanti Nainggolan, Yuni Dandy, Jonathan Devianti, Gusnia Dewi, Sintia Ayu Eka Jaya Prastiti, Arini Elya Resha, Enjel Fatah, Abdul Hadjranul Fauzi, M. Zainuddin Lutfi Florensia, Ornella Arnia Gibran , Syahrul Syah Gloria, Meilina H, Heja Hairiah, Rusliananur Hendrik Segah, Hendrik Hermayantiningsih, Dwi Hutabalian, Gracyela Hutapea, Sonia Tri Mart Grasella Ilham Maulana Indri Aprilia, Indri J, Julia Jaya Prastiti, Arini Eka Jonathan Dandy, Arisumi Ir L Tundan, Karelius, Karelius Kartika Komara, Nisa Kibtiyah, Maryatul Komara, Nisa Kartika Lawrence, Yoel Liswara Neneng Manalu, Mely Grace Manalu Manurung, Stepanus Fredi Marvin Horale Pasaribu Maulida, Maulida Maya Sylvani, Miranti Mokhamat Ariefin Nafisah, Zahrotun Natalia Sri Martani Natania Gracia, Amanda Ngazizah, Febri Nur Nisa Kartika Komara Nour baety, Shelly Siti Pangestika, Inten Pebriyanto, Yunus Prasetyo, Debby Catur Prayoga, Andika Prisnanda, Risky Rahman Rahman Remi Ayu Pratika Retno Agnestisia Riana Dewi, Syahrani Riansyah, Irza Rizki Rachmad Saputra Rizkita, Aden Dhana Sabatini, Felly Sari, Nopita Tamara Seda, Ananda Putri Seprianto, Seprianto Shapira, Shari Bella Sianturi, Dody Jhonatan Wilfiez Sidauruk, Christina Situmorang, Larissa Kristina T.T. Solla, Angelia Sylvani, Miranti Maya Tampubolon, Mulani Jeni Lestari Telaumbanua, Mesra Ratna Sari Tundan, Arisumi Ir L Wafa, Shahibatul Wahyu Supriyati Wiriatmaja, Nuraini Ulya Yanetri Asi Nion, Yanetri Asi Zadrax, Adellino Zaki, Azmi Malya Zimon Pereiz