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All Journal Fullerene Journal of Chemistry Indonesian Chimica Letters
Ratih Hidayah
Institut Teknologi Bandung
Chemistry

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Abu Limbah Sekam Padi sebagai Bioadsorben yang Efektif untuk Logam Timbal dalam Tanah Ani Qomariyah; Ratih Hidayah
Jurnal Kimia Fullerene Vol 6 No 2 (2021): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v6i2.273

Abstract

In this research, the effect of rice husk treatment, i.e. ashing to produce rice husk ash (RHA), working with base (BRH), and working with acid solution (ARH) on the adsorption capability of Pb(II) ions has been investigated. Adsorption was carried out by mixing 5 g of the adsorbent with 50 mL Pb(II) solution 100 ppm for 3 hours. The unadsorbed ions were analyzed by AAS (Atomic Absorption Spectrophotometre). Result showed that RH, RHA, BRH, and ARH adsorbents, adsorbed Pb(II) ions with the amount of 86,5 % ; 96,0 % ; 93,4 % ; and 33,0 % respectively. The highest adsorption of Pb(II) (96,0%) occured for the adsorbent of RHA. In the ashing process, the amount of heat or energy might be released and applyed as fuel in various purposes such as cooking and bricks production. Rice husk has multiple uses, besides being a fuel, it can also be used as an effective adsorbent for Pb(II) ions. The study of Pb(II) adsorption kinetics showed that a contact time of 3 hours was an effective time for rice husk ash to adsorb Pb(II) ions. The adsorption of Pb(II) metal by rice husk ash tends to follow a pseudo 2nd-order reaction kinetics pattern.
The Effect of Origin Region on The Essential Oil Profile of Kasturi Tobacco Leaves From Steam Distillation and Solvent Extraction Suci Nur Jannah; Ika Oktavianawati; I Nyoman Adi Winata; Ratih Hidayah; Fatimah Yusro
Indonesian Chimica Letters Vol. 4 No. 2 (2025)
Publisher : Department of Chemistry, FMIPA, UNEJ

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v4i2.60000

Abstract

Kasturi tobacco is a major domestic commodity from Jember that is well-valued by cigarette manufacturers for its intense aroma and unique flavor. When faced with government restrictions on cigarette production, the tobacco industry actively explores product diversification, and tobacco essential oil has emerged as a promising alternative. This study focuses on the utilization of Kasturi tobacco leaves from two different geographical locations in South Jember (Balung) and North Jember (Kalisat) to investigate how their location affects the essential oil profile. This study used two main extraction techniques, namely steam distillation and solvent extraction, to collect essential oils. The essential oils were analyzed based on their yield (based on dry weight) and chemical composition using GC-MS. The study showed that in North Kasturi leaves, increasing the steam distillation time resulted in a gradual increase in yield and chemical diversity. However, the steam distillation results for South Kasturi could not be used because the profile obtained was not representative. The difference in extraction methods shows significant results. Essential oil from North Kasturi produced through steam distillation (11 hours) has a lower yield and fewer compounds compared to the solvent extraction method. Solvent extraction results show that North Kasturi tobacco leaves produce a higher yield (5.2426%) compared to South Kasturi (4.0890%). Conversely, South Kasturi oil shows more chemical compound variation (29 compounds) compared to North Kasturi (24 compounds). The results prove that geographical origin affects the essential oil profile. 
Co-Authors Ani Qomariyah Fatimah Yusro I Nyoman Adi Winata Ika Oktavianawati Suci Nur Jannah