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All Journal CHEMICA Jurnal Teknik Kimia Al-Kimia Indonesian Journal of Chemistry Molekul: Jurnal Ilmiah Kimia AL-ULUM: JURNAL SAINS DAN TEKNOLOGI

Maya Rahmayanti

Department Of Chemistry, State Islamic University Of Sunan Kalijaga, Jl. Marsda Adi Sucipto, Yogyakarta 55281 Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Gadjah Mada, Sekip Utara PO BOX BLS 21, Yogyakarta 55281

Author-ID : 2672909

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Energy

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Articles

Aplikasi Membran Filter Keramik Untuk Menurunkan Konsentrasi Zat Warna Remazol Red dan Nilai COD Limbah Cair Batik Nur Fitriana; Maya Rahmayanti
Al-Kimia Vol 8 No 2 (2020): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v8i2.15932

Research on the application of ceramic filter membranes in reducing remazol red dye concentration and COD value of batik liquid waste has been carried out. The purpose of this study was to reduce the remazol red dye concentration and the COD value of batik wastewater using a ceramic filter membrane. The ceramic filter membrane used was made from clay and silica sand with variations in the number of additions of wood sawdust as much as 0, 1, 3, 5 and 7%. Then the porosity of the ceramic filter membrane was tested to determine the percentage of the pore volume that the ceramic filter membrane had. The ceramic filter membrane with the composition of clay, silica sand and 1% wood sawdust was the most optimum in reducing remazol red dye up to 86.68% and reducing COD value up to 97.87%. Keywords: filtration, remazol red, COD, ceramic filter membranes, batik liquid waste

Synthesis, Characterization, and Application of Magnetite (Fe3O4) Particles as Gold Adsorbent from Simulation Waste Maya Rahmayanti; Sri Juari Santosa; Sutarno Sutarno; Hilmi Hamidi; Lingga Binagara
CHEMICA: Jurnal Teknik Kimia Vol 7, No 2 (2020): Desember 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v7i2.17957

There have been many magnetic adsorbents in solid phase extraction to recover gold metal known as Magnetic Solid Phase Extraction (MSPE). In this study, magnetite was synthesized using the reverse coprecipitation method with the precipitating agent NaOH. The synthesized material was characterized using a Fourier Transform Infrared (FTIR) spectrophotometer, X-Ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM), and Scanning Electron Microscopy (SEM). The magnetite was then applied as a gold adsorbent from simulated waste (HAuCl4). The effect of acidity on the performance of magnetite as gold adsorbent was studied at various pH ranges. Based on the results of characterization using FTIR, magnetite has been successfully synthesized, marked by the appearance of a typical absorption for Fe-O bonds at a wave number of 578 cm-1. It is amplified with an XRD diffractogram, which gives peaks similar to a standard magnetite diffractogram. The value of the magnetite saturation magnetization was 93.90 emu/g. Based on application studies, [AuCl4] adsorption on magnetite was excellent in the pH range 3-5. The presumed interactions between [AuCl4]- and magnetite were through electrostatic (dipol-ion) interactions, hydrogen bonding, and redox reactions.

Isolation, Characterization and Application of Humin From Sumatran Peat Soils as Adsorbent for Naphtol Blue Black and Indigosol Blue Dyes Maya Rahmayanti; Indah Nurhikmah; Feni Larasati
Molekul Vol 16, No 1 (2021)
Publisher : Universitas Jenderal Soedirman

Isolation, characterization and application of humin as adsorbent for naphtol blue black (NBB) and indigosol blue (IB) dyes has been carried out. Humin application in this study aims to obtain the optimum pH conditions and kinetics model for adsorption NBB and IB dyes onto humin. Humin was isolated from peat soils originating from Riau, Sumatra. The isolation method used was the alkaline extraction method and the characterization of humin using FTIR spectrophotometer. The total acidity, carboxylic groups and –OH phenolic groups of humin were determined quantitatively using the acid-base titration method. FTIR characterization indicated the presence of an –OH group which was indicated by the appearance of absorption at a wavelength of 3425.3 cm-1 and a stretching vibration of C=O from the –COOH group at a wavelength of 1705 cm-1. The quantitative calculation of the total acidity value, the content of the carboxylic group and the -OH group phenolics of humin were 508.47 cmol kg-1, 289.42 cmol kg-1 and 219.05 cmol kg-1, respectively. The optimum pH conditions for adsorption NBB and IB onto humin occurred at pH 5 and pH 2, respectively. The adsorption kinetics model of NBB and IB on humin followed the Ho kinetics model.

SINTESIS DAN KARAKTERISASI MAGNETIT (Fe3O4): STUDI KOMPARASI METODE KONVENSIONAL DAN METODE SONOKIMIA Maya Rahmayanti
AL-ULUM: JURNAL SAINS DAN TEKNOLOGI Vol 6, No 1 (2020)
Publisher : Universitas Islam Kalimantan Muhammad Arsyad Al Banjari

Magnetite (Fe3O4) is one of the iron oxide compounds which has strong magnetic properties so that it is widely modified with other materials for application in solid phase extraction. This study aims to compare the physical and chemical properties of magnetite synthesized by conventional methods and magnetite synthesized by sonochemical methods. The physical and chemical properties of magnetite were studied using Fourier Transform Infrared (FTIR) and X-Ray Difraction spectrophotometry. Magnetite saturation magnetization (Ms) was measured using a Vibrating Sample Magnetometer (VSM). The results of FTIR characterization showed that the absorption at a wave number of 780 cm-1 was a typical absorption of magnetite Fe-O bonds both on magnetite synthesized through sonochemical and conventional methods. The difference in crystallinity of magnetite synthesized by the two methods was not significant. The Ms magnetite value synthesized by sonochemical method was higher than the Ms magnetite value synthesized by conventional method. Keywords: magnetite, Fe3O4, synthesis, conventional, sonochemical

Comparative Study on the Adsorption of [AuCl4]– onto Salicylic Acid and Gallic Acid Modified Magnetite Particles Maya Rahmayanti; Sri Juari Santosa; Sutarno Sutarno
Indonesian Journal of Chemistry Vol 16, No 3 (2016)
Publisher : Universitas Gadjah Mada

Salicylic acid-modified magnetite (Mag-SA) and gallic acid-modified magnetite (Mag-GA) particles were prepared by co-precipitation procedure. Characterization results showed the interaction that occurs between the surface of magnetite with salicylic acid (Mag-SA) and gallic acid (Mag-GA) was through hydrogen bonding. Adsorption of [AuCl4]– onto Mag-SA and Mag-GA surfaces as a function of initial pH, contact time, and initial concentration of the [AuCl4]– solution were comparatively investigated. Result showed that the optimum adsorption of [AuCl4]– onto Mag-SA or Mag-GA was found at pH 3. The adsorption process were found to allow the pseudo-second order equation, both for Mag-SA and Mag-GA. The parameters in isotherm adsorption equations conformed to the Langmuir and Freundlich isotherms very well for Mag-GA, but for Mag-SA, only conformed to the Langmuir isotherm very well. The result of this study demonstrate that the ability Mag-GA to adsorb [AuCl4]– higher than Mag-SA.

Co-Authors Feni Larasati Hilmi Hamidi Indah Nurhikmah Lingga Binagara Nur Fitriana Sri Juari Santosa Sri Juari Santosa Sutarno Sutarno Sutarno Sutarno

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