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All Journal Reaktor Makara Journal of Science International Journal of Renewable Energy Development
Yunarti, Rika Tri
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Journal : Makara Journal of Science

 1 
Adsorption of Phosphate Ion in Water with Lithium-Intercalated Gibbsite Sihombing, Riwandi; Krisnandi, Yuni Krisyuningsih; Widya, Rahma; Luthfiyah, Siti Zahrotul; Yunarti, Rika Tri
Makara Journal of Science Vol. 19, No. 4
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In order to enhance adsorption capacity of gibbsite (Al(OH)3 as an adsorbent for the adsorption of phosphate in water, gibbsite was modified through lithium-intercalation. The purification method of Tributh and Lagaly was applied prior to intercalation. The Li-Intercalation was prepared by the dispersion of gibbsite into LiCl solution for 24 hours. This intercalation formed an cationic clay with the structure of [LiAl2(OH)6]+ and exchangeable Cl- anions in the gibbsite interlayer. A phosphate adsorption test using Lithium-intercalated gibbsite (LIG) resulted in optimum adsorption occurring at pH 4.5 with an adsorption capacity of 11.198 mg phosphate/g LIG which is equivalent with 1.04 wt% LIG. The adsorption capacity decreased with decreasing amounts of H2PO4-/HPO4- species in the solution. This study showed that LIG has potential as an adsorbent for phosphate in an aqueous solution with pH 4.5–9.5.
Grass-Like Structured Mesoporous Carbon as an Acid Red 119 Dye Adsorbent Krisnandi, Yuni Krisyuningsih; Priantini, Tania; Faisal, Muhammad; Yunarti, Rika Tri; Saragi, Indah Revita; Gunlazuardi, Jarnuzi
Makara Journal of Science Vol. 23, No. 4
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Grass-like structured mesoporous carbon was prepared by the soft-template method using triblock copolymer Pluronic F127, affording an organic–organic composite structure between phloroglucinol and formaldehyde. Thermogravimetric analysis revealed that the as-synthesized mesoporous carbon is stable to 900 °C, and X-Ray Diffraction (XRD) analysis confirmed the presence of carbon material structures at 2θ values of 22.020° and 42.420°. A hysteresis loop at relative partial pressures (P/Po) between 0.45 and 0.85 was observed in the N2 adsorption isotherm, indicating that the solid material exhibits mesoporous characteristics, with a homogeneous pore size distribution of 8.863 nm. Scanning Electron Microscope (SEM) images revealed that the bulk carbon surface exhibits a uniform grass-like structure. Furthermore, the as-synthesized mesoporous carbon was investigated for the adsorption of a diazo dye Acid Red 119, and it exhibited an adsorption capacity of 217.7389 mg/g; this capacity is 1.53 times greater than that of commercial activated carbon. Therefore, this mesoporous carbon is a potential adsorbent for the treatment of synthetic coloring waste.
Effectiveness of Iron Fortification on Soy-Based Foods Using Ferrous Bisglycinate in the Presence of Phytic Acid Yunarti, Rika Tri; Zulys, Agustino; Harahap, Lina Yuliana; Pramukti, Mai Saroh Ambar
Makara Journal of Science Vol. 17, No. 1
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ANION EXCHANGE CAPACITY OF CHROMATE ON MODIFIED ZEOLITE CLINOPTILOLITE WITH HDTMA-Br AND ITS REGENERATION Wibowo, Widajanti; Utari, Tresye; Yunarti, Rika Tri
Makara Journal of Science Vol. 15, No. 1
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Zeolite Clinoptilolite from Lampung, located in South of Sumatra, had been modified with surfactant hexadecyltrimethylammonium bromide (HDTMA-Br) as chromate anion exchanger. Surfactant modified zeolite (SMZ) Clinoptilolite in particle size range of 1.5 - 2.0 mm, which contained 196.7 mmol HDTMA-Br/kg zeolite, was used for anion exchange of chromate at neutral pH. This experiment was conducted in a glass column filled with 5 gram SMZ. The breakthrough chromate exchange capacity was found 1.262 mg/g SMZ, while the total capacity was found 2.107 mg/g SMZ. The regeneration of SMZ saturated with chromate was conducted using a mixed solutions of 0.28 M Na2CO3 and 0.5 M NaOH, compared with using a solution of 0.01 M Na2S2O4. The desorption of chromate achieved 92% with the mixed solutions of Na2CO3 and NaOH and 90% with the Na2S2O4 solution. The regenerated SMZ with Na2CO3-NaOH solutions was prior washed with HCl solution to remove the carbonate from SMZ, before being used for chromate sorption again. Its breakthrough capacity was reduced to 1.074 mg/g SMZ, and to 0.724 mg/g SMZ when regenerated with Na2S2O4 solution. These results indicated that regeneration of SMZ affected its exchange capacity for anion chromate. However, it is still could be acceptable, when Na2CO3/NaOH solutions were used for the regeneration of SMZ saturated with anion chromate.
Synthesis of Copper (II) Oxide Nanoparticles using Vitis vinifera L. Leaf Ex-tract and its Application as a Catalyst in Doebner Reaction Kurniawan, Felie Virgayani; Cahyana, Antonius Herry; Yunarti, Rika Tri
Makara Journal of Science Vol. 27, No. 3
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Plant extracts can be used to synthesize nanoparticle because it is efficient, economical, and friendly to the environment. Copper oxide nanoparticles (CuO NPs) were synthesized using an aqueous fraction of Vitis vinifera L leaf extract and Cu(NO3)2 solution as a precursor. This fraction contains secondary metabolites as a reduction agent and stabilizing agents to formed CuO NPs. CuO NPs can be used as a catalyst in a chemical reaction, one of which is the Doebner reaction, which is a simple and efficient reaction of aniline, aromatic aldehydes, and pyruvic acid under reflux conditions to produce derivatives quinoline-4-carboxylic acid. CuO NPs were effectively used in the Doebner reaction and yielded a product is 79.84%. The CuO NPs characterized by Fourier Transform Infra-Red (FTIR), and X-ray Diffraction (XRD) which showed CuO NPs were formed with a size of 24.39 nm. The product synthesized was characterized by TLC (Thin Layer Chromatography), FTIR, UV-Vis Spectrophotometry, and Liquid Chromatography Mass Spectrometry (LC-MS) and confirmed 2-phenylquinoline-4-carboxylic acid was formed.
Co-Authors Agustino Zulys Antonius Herry Cahyana Dwiatmoko, Adid Adep Harahap, Lina Yuliana Jarnuzi Gunlazuardi Kurniawan, Felie Virgayani Luthfiyah, Siti Zahrotul Muhammad Faisal Nino Rinaldi Pramukti, Mai Saroh Ambar Priantini, Tania Riwandi Sihombing, Riwandi Riyandi, Rafly Saputri, Yosephine Liliana Intan Danar Saragi, Indah Revita Simanjuntak, Fidelis Stefanus Hubertson Tresye Utari, Tresye Widajanti Wibowo Widya, Rahma Yuni Krisyuningsih Krisnandi, Yuni Krisyuningsih