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All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Indonesian Journal of Chemistry Makara Journal of Science
Rizki, Widya Twiny
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science

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Synthesis of SnO2-Fe3O4 Nanocomposites using Hydrothermal Method Widya Twiny Rizki; Poedji Loekitowati Hariani; Addy Rachmat; Muhammad Said; Nur Hanis Hayati Hairom
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 5, No 3 (2020): October 2020
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v5.i3.88

Abstract

Synthesis of nanocomposite SnO2-Fe3O4 using the hydrothermal method was conducted in this study. The purpose of this study was to determine the best mass ratio in the synthesis of SnO2-Fe3O4. Nanocomposite SnO2-Fe3O4 were made with mass ratio (1:1), (1:2) and (2:1) were characterized using XRD and FTIR. The result of SnO2 characterization using XRD analysis was showed a sharp intensity peak at 2  = 26.5. The result of  Fe3O4 characterization using XRD analysis was showed a sharp intensity peak at 2  = 35.86. The XRD characterization result of SnO2-Fe3O4 (1:2) 2  = 26.74 and 34.08. Based on the XRD characterization, it can be concluded the best mass ratio for SnO2-Fe3O4 was (1:2). Characterization nanocomposite SnO2-Fe3O4 using FTIR showed the absorption band at 590 cm-1 is a characteristic peak of Sn-O and the absorption band at 563 cm-1 corresponds to Fe-O.
Cr (III)-Doped Bentonite: Synthesis, Characterization and Application for Phenol Removal Purwaningrum, Widia; Vilantina, Vilantina; Rizki, Widya Twiny; Desnelli, Desnelli; Hariani, Poedji Loekitowati; Said, Muhammad
Makara Journal of Science Vol. 25, No. 2
Publisher : UI Scholars Hub

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Abstract

Study of doping process of metal oxide Cr(III) onto bentonite for phenol removal has been done. The purpose of this study was to increase the capacity and effectiveness of bentonite adsorption.The doped bentonite was characterized using XRD, SEM-EDX and FT-IR spectrophotometer analysis. XRD characterization result showed an angle shift (2θ) characteristic at1.609°. The SEM-EDX characterization result showed that bentonite as control have a more gaps than Cr(III)-doped bentonite. Based on EDX result, the Al element decreased from 7.53% to 3.76%, Si from 19.84% to 10.23% and appeared Cr element 2.06%, The FT-IR characterization result showed no significant friction in the spectrum so it can be identified as physical adsorption. The adsorption of phenol was applied at pHpzc, which for bentonite as control was applied at pH 4 and Cr(III)- doped bentonite was applied at pH 8. The phenol adsorption rate fitted to pseudo-second-order and it was found that the equilibrium data was best followed by Freundlich isotherm model, the amount of adsorption rate constant (k) and adsorption capacity (Qe) was 0.0024 g.mg-1min-1 and 16.95 mg/g. The Enthalpy (ΔH) and entropy (ΔS) values decrease with increasing phenol concentration and the positive free energy value was indicated that the proccess was nonspontaneous because there has been an equilibrium state. Based on the adsorption result, it can be concluded that the doping method can produce better bentonite performance to adsorb phenol.
Tannin Extraction from Bark of Cinnamomum burmannii and Its Application for use as Natural Dye and as Antioxidant Rizki, Widya Twiny; Wahyuni, Winika Sri; Sari, Ririn Depita; Lestari, Siti Marwah; Rahmadevi, Rahmadevi
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 9, No 1 (2024): February 2024
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v9.i1.35

Abstract

Cinnamon bark (Cinnamomum burmannii) contains tannins which have the potential to act as natural dyes. This research is to synthesize natural dye from cinnamon bark extract (Cinnamomum burmannii). The research was carried out by making cinnamon bark extract by comparing the amount of solvent by maceration using 96% ethanol, calculating the yield, tannin analysis, FTIR analysis, and stability test color. The comparison of the amount of cinnamon bark extraction solvent affected the resulting yield. Testing the tannin compound with 1% gelatin reagent in 10% NaCl showed a white precipitate and 1% FeCl3 reagent produced a greenish-brown color so the extract was positive for tannin, analysis FTIR ratio 1:10 for the presence of O-H, C-H, C=C, C-O groups, ratio 1:15 for the presence of O-H, C-H, C=C, C-O group. The color stability test of cinnamon bark extract is more stable than Rhodamine-B. Based on the extraction results, it was concluded that cinnamon bark extract can be used as an alternative to natural dye in cosmetic products.Keywords: Cinnamon Bark, Extract, FTIR Analysis, Natural dyes, Tannin
Modification of Chitosan using Fe3O4 and Glucose and Its Application for Phenol Removal Rizki, Widya Twiny; Lestari, Siti Marwah; Rahmah, Vindi Annisa; Dauli, Rd Rahmat
Indonesian Journal of Chemistry Vol 25, No 5 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.103140

Abstract

In this study, chitosan was modified with Fe3O4 and glucose to enhance its capacity and effectiveness in adsorbing phenol from organic waste. XRD analysis revealed distinct differences between unmodified chitosan and the Fe3O4/glucose-modified version, with the resulting nanocomposite showing a particle size of 17.21 nm. FTIR spectra exhibited new, sharper peaks at 531 and 544 cm−1, indicating interactions between chitosan and Fe3O4 via the nitrogen atom in the NH2 group. VSM characterization showed a saturation magnetization of 63.4 emu/g, confirming that the chitosan/Fe3O4/glucose nanocomposite is superparamagnetic. SEM analysis revealed an uneven, porous surface, while the morphology displayed dark Fe3O4 spots dispersed across a lighter chitosan matrix. The optimal adsorption condition was achieved at a contact time of 60 min, with an adsorption efficiency of 16.46%. In addition to reducing phenol content in wastewater, the modified nanocomposite also exhibited antibacterial activity against Staphylococcus aureus and Escherichia coli. This multifunctional material offers a promising solution for wastewater treatment, targeting both organic pollutants and pathogenic bacteria to help address water pollution challenges.
Co-Authors Addy Rachmat Addy Rachmat Desnelli Desnelli Fahma Riyanti Handayani Citra Pratiwi MUHAMMAD SAID Muhammad Said Muhammad Said Nur Hanis Hayati Hairom Poedji Loekitowati Hariani Rahmadevi Rahmah, Vindi Annisa Rd. Rahmat Dauli Sari, Ririn Depita Siti Marwah Lestari Vilantina, Vilantina Wahyuni, Winika Sri Widia Purwaningrum