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All Journal Walisongo Journal of Chemistry Stannum : Jurnal Sains dan Terapan Kimia
Rohmatullaili Rohmatullaili
Universitas Islam Negeri Raden Fatah Palembang
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

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Adsorpsi Logam Ni (II) pada Adsorben ‘Ramah Lingkungan’ Asam Humat Kotoran Kuda Rohmatullaili Rohmatullaili
Walisongo Journal of Chemistry Vol 3, No 2 (2020): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v3i2.6104

Abstract

Ekstraksi asam humat dari kotoran kuda telah dilakukan dengan prosedur standar International Humic Substance Society (IHSS) di bawah atmosfer udara.  Penelitian ini dilakukan untuk memanfaatkan asam humat kotoran kuda (AHKK) sebagai adsorben limbah logam Ni (II). Dugaan awal adanya Asam Humat dalam kotoran kuda dikarenakan kandungan lignin di dalamnya. Persentase ekstraksi asam humat murni dari kotoran kuda mencapai 0,4%. Interaksi AHKK dengan logam Ni(II) dilakukan dalam larutan. Aspek adsorpsi yang dipelajari meliputi pengaruh pH, waktu kontak, kinetika, kapasitas adsorpsi, dan model isoterm adsorpsi Asam Humat Kotoran Kuda terhadap logam Ni (II). Adsorpsi logam Ni (II) pada AHKK mengikuti model isoterm adsorpsi Langmuir. Hasil penelitian menunjukkan bahwa Asam Humat dapat diekstraksi dari kotoran kuda, dan dapat mengadsorpsi logam Ni (II) pada situs aktifnya. Adsorpsi yang terjadi hanya pada lapisan tunggal, yang berarti situs aktif pada permukaan adsorben memiliki kemampuan adsorpsi yang sama dan terdistribusi secara merata.
Pemanfaatan Kulit Kakao Adsorben Sebagai Pemurnian Minyak Goreng Bekas Rini Marlina; Ade Oktasari; Rohmatullaili Rohmatullaili
Stannum : Jurnal Sains dan Terapan Kimia Vol 4 No 1 (2022): April 2022
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v4i1.2638

Abstract

Cooking oil, triglycerides that is liquid at room temperature, is one of important foodstuffs. Repeated use of cooking oil might decrease the quality of the oil and leads to negative impacts on health. An alternative method to treat used cooking oil is adsorption with cacao shell. This present study aims to find out the influences of adsorbent and size variation of cacao peels as the adsorbent on the reduction of free fatty acid, peroxide numbers and water content in used cooking oil. The test parameters of this study were the reduction of free fatty acids by alkalimetric titration; peroxide number by iodometric titration; and content of water by oven-drying method. In the present study, cacao nibs were used as an absorbent to reduce the levels of free fatty acid, water, and peroxide number with variety sizes of the particle, such as 100 mesh and 120 mesh: and 8-hour contact time. The results of the present study indicated a decrease in free fatty acid from 0,448% to 0,327% dan 0,278%; the initial water content of 0,020% decreased to 0,010% and 0,009%; the peroxide number changed from 15,3 meq O2/kg to 3,25 meq O2/kg and 1,25 meq O2/kg. Based on the results, the absorbent that has the optimum adsorption is the 120 mesh particle size of adsorbent.
Co-Authors Ade Oktasari Rini Marlina