Article Per Year (5 Year)
p-Index From 2020 - 2025
1.578
P-Index
This Author published in this journals
All Journal BERKALA SAINSTEK Jurnal Sains dan Teknologi Alchemy : Journal of Chemistry Jurnal Bahan Alam Terbarukan JST ( Jurnal Sains Terapan ) Communications in Science and Technology Chemistry Indonesian Journal of Chemical Research
Rahmayanti, Maya
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

Published : 10 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 10 Documents
Search

 1 
Application of Humic Acid Isolated From Kalimatan Peat Soil Modifying Magnetite for Recovery of Gold Rahmayanti, Maya; Abdillah, Guliston; Santosa, Sri Juari; Sutarno, Sutarno
Jurnal Bahan Alam Terbarukan Vol 8, No 2 (2019): December 2019 [Nationally Accredited - Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v8i2.20392

Abstract

Humic acid modifying magnetite particles (Mag-HA) were developed for recovery of gold from chloride solution (HAuCl4). The Mag-HA particles were prepared by co-precipitation procedure with Fe(III) and Fe(II) chloride salts, sodium hydroxide, and humic acid. FTIR characterization for Mag-HA after modification indicated the presence of the specific absorption for functional groups of humic acid and Fe-O bonds, though with lower intensity. The Mag-HA particles exhibited a typical superparamagnetic characteristic with a saturation magnetization of 66.99 emu/g. The Mag-HA particles were applied for AuCl4- adsorption and results showed that the optimum adsorption of [AuCl4]- onto Mag-HA was found at pH 3. The adsorption kinetics can be described by a pseudo-second order equation and the adsorption isotherm of the Mag-HA particles agreed well with Langmuir adsorption equation. The maximum adsorbed amount of [AuCl4]- was 0.62 mmol/g and the XRD analysis confirms that the adsorption of Au(III) by Mag-HA was accompanied by the formation of elemental gold.
EFEKTIVITAS BIJI ASAM JAWA SEBAGAI KOAGULAN ALAMI DALAM MENURUNKAN KONSENTRASI ZAT WARNA REMAZOL RED DAN NILAI COD Pembayun, Sekar Wangi Retno; Rahmayanti, Maya
JST (Jurnal Sains dan Teknologi) Vol 9, No 2 (2020)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (265.262 KB) | DOI: 10.23887/jst-undiksha.v9i2.28171

Abstract

Penelitian ini bertujuan untuk menurunkan konsentrasi zat warna remazol red (RR) dan nilai COD limbah cair batik menggunakan biji asam jawa sebagai koagulan alami. Karakterisasi biji asam jawa (Tamarindus indica) dilakukan menggunakan spektofotometer FTIR. Penentuan pH optimum interaksi koagulan dengan zat warna RR dipelajari pada pH 2, 3, 4, 5, dan 6. Hasil karakterisasi biji asam jawa menunjukkan adanya serapan di daerah 3417,86 cm-1 yang mengindikasikan keberadaan gugus -OH dan -NH2. Karakterisasi biji asam jawa setelah koagulasi menunjukkan tidak terbentuknya serapan baru, hanya saja terjadinya pergeseran bilangan gelombang di daerah 3400 cm-1 yang diduga disebabkan karena terjadi interaksi elektrostatik antara permukaan koagulan dan permukaan zat warna RR. pH optimum interaksi koagulan dengan zat warna RR didapatkan pada pH 3 dengan persentase penurunan zat warna RR sebesar 68,26% dan penurunan nilai COD sebesar 97,94%. Berdasarkan penelitian ini dapat disimpulkan bahwa biji asam jawa dapat digunakan sebagai koagulan untuk menurunkan konsentrasi zat warna RR dan nilai COD limbah cair batik.
Modified Humic Acid from Peat Soils with Magnetite (Ha-Fe3O4) by Using Sonochemical Technology for Gold Recovery Rahmayanti, Maya; Santosa, Sri Juari; Sutarno, Sutarno
Jurnal Bahan Alam Terbarukan Vol 9, No 2 (2020): December 2020 [Nationally Accredited - Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v9i02.26131

Abstract

Sonochemical technology is a technology that involves ultrasonic waves in chemical reactions. In this study, humic acid isolated from peat soil has been successfully modified with magnetite (HA-Fe3O4) using sonochemical technology. Characterization of the physical and chemical properties of HA-Fe3O4 was carried out using FTIR, XRD, SEM and VSM. HA-Fe3O4 was used for recovery of gold from simulated gold waste (HAuCl4). FTIR characterization showed that the interaction between HA and Fe3O4 was through hydrogen bonds. The crystal size of HA-Fe3O4 using the Debye-Scherrer equation based on the XRD diffractogram was 12.4 nm. The saturation magnetization value of HA-Fe3O4 obtained was 52.80 emu/g. Adsorption studies at various pH showed that HA-Fe3O4 has been successful in recovering of gold from simulated gold waste. The % recovery of gold was 99%. Gold recovery occurs through the adsorption process followed by reduction of Au (III) to Au(0).
Aplikasi Asam Humat Hasil Isolasi Tanah Gambut Kalimantan sebagai Adsorben Zat Warna Naphtol Blue Black dan Indigosol Blue: Studi Perbandingan Model Kinetika dan Isoterm Adsorpsi Rahmayanti, Maya; Prandini, Masyithah Nisvi; Santi, Gita Citra
JST (Jurnal Sains Terapan) Vol 6, No 2 (2020): JST (Jurnal Sains Terapan)
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat, Politeknik Negeri Balikpapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jst.v6i2.891

Abstract

A comparative study of kinetic  and isotherm adsorption  models of naphtol blue black (NBB) and indigosol blue (IB) dyes adsorption onto humic acid (HA) isolated from Kalimantan peat soils has been carried out. Adsorption of NBB and IB in HA follows the second order Ho kinetics model, with the reaction rate constant of NBB adsorption  onto HA higher than the the reaction rate constant of IB adsorption  onto HA. Studi of adsorption isotherm showed that the adsorption of NBB and IB in HA follows the Langmuir isotherm model with the maximum adsorption capacity of NBB and IB in HA respectively 0.12 x 10-4 and 1.04 x 10-4 mol/g. Keywords : naphtol blue black, indigosol blue, humic acid,  adsorption kinetic, adsorption isotermABSTRAKStudi perbandingan model kinetika dan isoterm adsorpsi  zat warna naphtol blue black (NBB) dan indigosol blue (IB) pada asam humat (HA) hasil isolasi tanah gambut Kalimantan telah dilakukan. Adsorpsi NBB dan IB pada HA mengikuti model kinetika orde dua Ho, dengan konstanta laju reaksi adsorpsi NBB pada HA lebih tinggi dibandingkan konstanta laju reaksi adsorpsi IB pada HA. Studi isoterm reaksi menunjukkan bahwa adsorpsi NBB dan IB pada HA mengikuti model isoterm Langmuir dengan kapasitas adsorpsi maksimum NBB dan IB pada HA berturut-turut adalah 0,12 x 10-4 dan 1,04 x 10-4 mol/g.Kata kunci :  naphtol blue black, indigosol blue, asam humat,  kinetika adsorpsi, isoterm adsorpsi
The Effectiveness of Magnetite Modified Gallic Acid Synthesized by Sonochemical Method As AuCl4- Adsorbent-Reductor Rahmayanti, Maya; Santosa, Sri Juari; Sutarno, Sutarno; Paweni, Astuti
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2021.8-may

Abstract

In recent years gallic acid has been developed as an AuCl4- adsorbent-reducing agent. In this research, gallic acid was modified with magnetite by sonochemical method (GA-Fe3O4), and its effectiveness as an AuCl4- adsorbent was studied. GA-Fe3O4 was synthesized through one-stage (GA-Fe3O4-SK1) and two-stage (GA-Fe3O4-SK2) methods. The effectiveness of GA-Fe3O4 was studied through optimization studies on pH, time, kinetics, and isotherm adsorption of AuCl4-. The adsorption method used was the batch method in the pH range 2-7. While the kinetics model used was the Lagergren and Ho kinetics model. The adsorption isotherm model used was the Freundlich and Langmuir isotherm model. The results showed that the optimum pH conditions for adsorption of AuCl4- on GA-Fe3O4 occurred at pH 3. Adsorption of AuCl4- on GA-Fe3O4-SK1 and GA-Fe3O4-SK2 both followed the Ho kinetic model, while the adsorption isotherm followed the Freundlich isotherm model with values KF were 0.041 and 0.034 mol/g respectively.
The Interaction Mechanism of Papaya Seeds (Carica papaya L.) as a Natural Coagulant and Remazol Red Under Different pH Conditions Dewi, Vina Melinda Inka; Rahmayanti, Maya
Indonesian Journal of Chemical Research Vol 10 No 1 (2022): Edition for May 2022
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2022.10-vin

Abstract

Batik wastewater contains a high concentration of dye that comes from the batik dyeing process. In this study, papaya seeds were applied as a natural coagulant to reduce the concentration of remazol red in batik wastewater. Dried papaya seeds were characterized using Fourier Transform Infrared Spectroscopy (FTIR). The coagulation method used the batch method in the pH range of 1-6. The FTIR spectra showed that the papaya seeds contained compounds with -NH2 and -COOH functional groups. The results of coagulation showed that the pH of batik wastewater had an effect on the ability of papaya seeds to reduce the concentration of remazol red. The optimum pH condition was obtained at pH 2 with a decrease in the concentration of remazol red by 96.1%. The interaction that occurs between the coagulant of papaya seeds and the remazol red of batik wastewater is through electrostatic interactions.
Eco-friendly synthesis of magnetite based on tea dregs (Fe3O4-TD) for methylene blue adsorbent from simulation waste Rahmayanti, Maya; Yahdiyani, Atika; Afifah, Ika Qurrotul
Communications in Science and Technology Vol 7 No 2 (2022)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.7.2.2022.965

Abstract

Methylene blue is a popular dye used in the batik industry; however, it potentially causes environmental problems in view of the residual MB content in the liquid waste, which is difficult to naturally degrade. This study aimed to synthesize Fe3O4-TD using tea dregs from household waste and its application as an adsorbent for methylene blue dye. The synthesis was carried out using the reverse co-precipitation method with water as a solvent at room temperature. Fe3O4-TD characterization using FTIR, XRD, and PSA. The adsorption of methylene blue (MB) on Fe3O4-TD was studied at various pH MB, reaction time, and concentration MB to determine the kinetic model and MB adsorption isotherm on Fe3O4-TD and the interactions that occur between MB and Fe3O4-TD. FTIR spectra and X-Ray diffractogram showed that the magnetite formed in a pure state did not mix with other iron oxides. The crystal and particle size of Fe3O4-TD is 18.92 nm and 26.70 µm, respectively. MB adsorption on Fe3O4-TD occurred well at pH > 3 and followed the Ho' pseudo-second-order kinetics model and the Freundlich isotherm model. The interactions between MB and Fe3O4-TD through electrostatic interactions, hydrogen bonds, and phi-phi interactions.
Performance of Ceramic Membrane Modified with Corncob Activated Carbon for Efficient Remazol Red Removal in Batik Wastewater Ardiyanto, Muhammad Malik Firdaus; Rahmayanti, Maya
BERKALA SAINSTEK Vol 10 No 4 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i4.34941

Abstract

A ceramic membrane modified with corncob activated carbon (CMCC) has been successfully prepared and used to reduce the concentration of remazol red in batik wastewater. This research aims to study the effect of corncob activated carbon (CC) in the ceramic membrane on the porosity of the ceramic membrane and its ability to reduce the concentration of remazol red dye in batik wastewater. The variation of % CC to the mass of clay used was 0%, 5%, 10%, 15%, 20%, and 25%. Characterization of CC includes ash content and characterization of CMCC includes porosity test, morphological analysis, and elemental distribution based on SEM-EDX. The results showed that the ash content of CC before and after activation was 5.625% and 2.974%, respectively. The CMCC porosity test results showed that the more CC added, the greater the porosity of the ceramic membrane. The elemental composition in CMCC is dominated by O, Si, Al and C. The addition of 10% CC obtained the optimum composition on a ceramic membrane. % removal of remazol red is 83.9%. The COD values of batik wastewater before and after processing with CMCC were 484.286 and 26,339 mg/L, respectively.
Application of Edible Film from Mung Bean Starch with the Addition of Glycerol Plasticizer on Broccoli Setiani, Ugi Asih; Sedyadi, Endaruji; Rahmayanti, Maya; Warsito, Gita Miranda
ALCHEMY:Journal of Chemistry Vol 13, No 1 (2025): ALCHEMY: JOURNAL OF CHEMISTRY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/al.v13i1.31683

Abstract

The research on making edible film from mung bean starch with glycerol plasticizer as broccoli packaging aims to determine the characteristics of the edible film from mung bean starch with glycerol addition and its effect on broccoli weight loss. This study involved three stages, which include producing mung bean starch, making and characterizing the edible film, and applying the edible film on broccoli. The glycerol concentrations added were 25.2%, 31.5%, and 37.8% of the starch weight used. The edible film characteristics tested were thickness, tensile strength, elongation, Young's modulus, water vapor transmission rate (WVTR), and ash content. The application test on broccoli lasted 9 days. Results showed that thickness, tensile strength, and ash content met edible film standards, while elongation, Young's modulus, and WVTR did not meet applicable standards. Broccoli coated with the edible film had lower weight loss compared to the control.
EFEKTIVITAS BIJI ASAM JAWA SEBAGAI KOAGULAN ALAMI DALAM MENURUNKAN KONSENTRASI ZAT WARNA REMAZOL RED DAN NILAI COD Pembayun, Sekar Wangi Retno; Rahmayanti, Maya
JST (Jurnal Sains dan Teknologi) Vol. 9 No. 2 (2020)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (265.262 KB) | DOI: 10.23887/jstundiksha.v9i2.28171

Abstract

Penelitian ini bertujuan untuk menurunkan konsentrasi zat warna remazol red (RR) dan nilai COD limbah cair batik menggunakan biji asam jawa sebagai koagulan alami. Karakterisasi biji asam jawa (Tamarindus indica) dilakukan menggunakan spektofotometer FTIR. Penentuan pH optimum interaksi koagulan dengan zat warna RR dipelajari pada pH 2, 3, 4, 5, dan 6. Hasil karakterisasi biji asam jawa menunjukkan adanya serapan di daerah 3417,86 cm-1 yang mengindikasikan keberadaan gugus -OH dan -NH2. Karakterisasi biji asam jawa setelah koagulasi menunjukkan tidak terbentuknya serapan baru, hanya saja terjadinya pergeseran bilangan gelombang di daerah 3400 cm-1 yang diduga disebabkan karena terjadi interaksi elektrostatik antara permukaan koagulan dan permukaan zat warna RR. pH optimum interaksi koagulan dengan zat warna RR didapatkan pada pH 3 dengan persentase penurunan zat warna RR sebesar 68,26% dan penurunan nilai COD sebesar 97,94%. Berdasarkan penelitian ini dapat disimpulkan bahwa biji asam jawa dapat digunakan sebagai koagulan untuk menurunkan konsentrasi zat warna RR dan nilai COD limbah cair batik.
Co-Authors Abdillah, Guliston Afifah, Ika Qurrotul Ardiyanto, Muhammad Malik Firdaus Dewi, Vina Melinda Inka Endaruji Sedyadi Paweni, Astuti Pembayun, Sekar Wangi Retno Prandini, Masyithah Nisvi Santi, Gita Citra Setiani, Ugi Asih Sri Juari Santosa Sutarno Sutarno Warsito, Gita Miranda Yahdiyani, Atika