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All Journal Jurnal Teknik ITS EduChemia (Jurnal Kimia dan Pendidikan)
Wahida Annisa Ermadayanti
Chemistry Department, Institut Teknologi Sepuluh Nopember
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Materials Science & Nanotechnology

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Synthesis of TiO2/Zeolite-A Composite for The Removal of Methylene Blue on Direct Sunlight Yasokhi Fatkhasari; Nafiah Afuw Rouf; Wahida Annisa Ermadayanti; Randy Yusuf Kurniawan; Arseto Yekti Bagastyo
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (554.402 KB) | DOI: 10.12962/j23373539.v8i2.49669

Abstract

Wastewater generated from textile industry contains azo dye, (e.g., methylene blue), which is inefficient to decompose by using biological processes, and requires long treatment time. TiO2 is the most widely used adsorbent for industrial applications and photocatalytic degradation of various azo dyes in textile wastewater. Its anatase is the most effective and widely used photocatalyst, however the wide band gap of TiO2 has limited its widespread application in industry since it needs to be excited by ultraviolet (UV) light. In order to overcome this issue, combination of adsorbent zeolite and TiO2 into the composite was used in this study so that TiO2 can adsorb methylene blue under direct sunlight. Composition of 1 g TiO2 and 1 g Zeolite composite was used in batch method to eliminate different methylene blue concentrations, i.e., 25; 50; 75; 100; 125; 150; 200; and 250 ppm by means of adsorption process under direct sunlight. The experimental result showed that addition of zeolite was able to considerably improve adsorption capacity of TiO2 on direct sunlight in the range of 97.2 – 99.3 % of methylene blue removal. The highest removal was observed in the case of lower concentrations of methylene blue, i.e., in the range of 25-50 ppm.
Michelia Alba Flower Oil Components as Tyrosinase Inhibitors: In Silico Study Paundra Rizky Pratama; Felysia Isman; Cici Muarifah; Wahida Annisa Ermadayanti; Arif Fadlan
EduChemia (Jurnal Kimia dan Pendidikan) Vol 7, No 1 (2022)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/educhemia.v7i1.12259

Abstract

Melanin is generally known as a protector of human skin against radiation. However, the excessive production of melanin induces hyperpigmentation and other skin disorders. Arbutin, kojic acid, and hydroquinone have been used as inhibitors for tyrosinase which involves the synthesis of melanin through melanogenesis, but they show adverse effects. This article reports the potential of methyl 2-methylbutyrate, β-pinene, limonene, 1,8-cineole, linalool, α-terpineol, geraniol, and β-phenyl ethylalcohol contained in the essential oils of Michelia alba as tyrosinase inhibitors by in silico study. The experiments were conducted through molecular docking against a human tyrosinase protein target (1BUG) followed by absorption, distribution, metabolism, excretion, and toxicity (ADMET) prediction. Geraniol, β-phenyl ethyl alcohol, α-terpineol, and limonene yielded better docking scores than hydroquinone. These four compounds and 1,8-cineole and β-pinene, showed lower docking scores than kojic acid. The compounds interacted with 1BUG through hydrogen bonding, Van der Walls, alkyl/π-alkyl interactions, and π-π stacking. ADMET analysis indicated that they were potential candidates for oral drugs.
Co-Authors Bagastyo, Arseto Yekti Cici Muarifah Fadlan, Arif Felysia Isman Nafiah Afuw Rouf Paundra Rizky Pratama Randy Yusuf Kurniawan Yasokhi Fatkhasari