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All Journal Indonesian Journal of Chemistry ADMA: Jurnal Pengabdian dan Pemberdayaan Masyarakat
Sisca, Vivi
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Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Languange, Linguistic, Communication & Media Nursing Social Sciences Other

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Pengolahan Limbah Kulit Buah menjadi Eco-Enzyme pada Siswa SMKN 10 Merangin Viza, Rivo Yulse; Sisca, Vivi; Handayani, Pitri; Ratih, Arista
ADMA : Jurnal Pengabdian dan Pemberdayaan Masyarakat Vol 3 No 2 (2023): ADMA: Jurnal Pengabdian dan Pemberdayaan Masyarakat
Publisher : LPPM Universitas Bumigora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30812/adma.v3i2.2506

Abstract

Fruit peel waste, so that it is not problematic for the environment and health, can be used as a source of eco enzyme raw materials, which are the result of fermentation of fruit/vegetable residue, sugar, and water. Eco enzymes can be made by mixing organic waste, such as fruit and vegetable waste, with sugar and water in a ratio of 3: 1: 10. Basically, all fruit and vegetable waste can be used as raw material for making eco enzymes. The service activity of processing fruit peel waste into Eco-enzyme invites students to handle waste in a simple way around the school. This service activity is carried out through group practice. Making eco enzyme invites students to use this liquid as a natural cleanser, one of the experiments to handle the waste. Using fruit peel waste as an eco enzyme as an alternative to cleaning fluid adds insight and skills in processing fruit peel waste into cleaning fluid.
Effect of Sodium Citrate and Urea as Additive on the Synthesis of Hydroxyapatite from Blood Cockle Shells: Kinetics and Adsorption Isotherms Study of Coomassie Brilliant Blue Putri, Dhea Rahmanda; Jamarun, Novesar; Septiani, Upita; Sisca, Vivi
Indonesian Journal of Chemistry Vol 25, No 4 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.102465

Abstract

Hydroxyapatite (HAp) was synthesized from blood cockle shell waste by the sol-gel method, incorporating sodium citrate and urea as additives for Coomassie brilliant blue (CBB) adsorption. The synthesis included HAp without additives (HAp 1) and with 30 g/L of urea and varying sodium citrate concentrations of 0 (HAp 2), 0.1 (HAp 3), 0.2 (HAp 4), 0.3 (HAp 5), 0.4 (HAp 6), and 0.5 (HAp 7) g/L. HAp 4 showed the highest adsorption capacity at 96.60 mg/g. FTIR analysis of HAp 4 revealed adsorption bands for O−H and PO43− groups. XRD analysis indicated a crystal size of 24.55 nm with low crystallinity. SEM-EDS analysis showed a Ca/P ratio of 1.28, with an irregular shape due to agglomeration and an average particle size of 1.16 µm. SAA analysis found a surface area of 107.18 m2/g, a pore size of 12.55 nm, and a pore volume of 0.36 cm3/g. HAp 4 followed the Langmuir and pseudo-second-order isotherm models in CBB adsorption and demonstrated five-time reusability, proving it to be an effective adsorbent for CBB dyes.
Co-Authors Handayani, Pitri Novesar Jamarun Putri, Dhea Rahmanda Ratih, Arista Upita Septiani Viza, Rivo Yulse