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All Journal Jurnal Fisika Unand Jurnal Riset Kimia CHEMPUBLISH JOURNAL Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry Eksakta : Berkala Ilmiah Bidang MIPA Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Kimia Unand
Yeni Stiadi
Departemen Kimia FMIPA Universitas Andalas
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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COMPARATIVE OF INHIBITORY EFFICIENCY OF LIGNIN EXTRACT OF NIPAH (Nypa fruticans Wurmb) PEEL AND FROND ON MILD STEEL IN HCl MEDIUM Emriadi, Emriadi; Sartika, Hilda; Pradiwi, Nailatul Zahrah; Stiadi, Yeni
Indonesian Journal of Pure and Applied Chemistry Vol 8, No 1 (2025)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v8i1.83186

Abstract

Lignin extract from nipah fruit skin and nipah frond (Nypa fruticans Wurmb) was effectively extracted and used as a corrosion inhibitor on mild steel samples. The corrosion inhibition efficiency of lignin extract in 1 N HCl solution was determined by the weight loss method and surface morphology analysis using an optical microscope. The measurement results showed that the highest efficiency was obtained at the concentration of lignin extract from fruit skin (ELBN) and nipah frond (ELPN) of 82.16 and 78.36%. The adsorption of lignin extract on the surface of mild steel follows the Langmuir isotherm adsorption and includes mixed adsorption leading to chemical adsorption.
Structure, Morphology, Optical, Magnetic and Dielectric Properties of Ni1-xCdxFe2O4 Material Synthesized by Autocombustion Method Libra, Poppi Darmila; Syukri, Syukri; Stiadi, Yeni; Rahmayeni
Jurnal Riset Kimia Vol. 16 No. 2 (2025): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v16i2.855

Abstract

Materials with nanoscale dimensions have recently attracted attention due to their outstanding electrical, magnetic, and dielectric capabilities. Electromagnetic materials, known as spinel ferrite MFe2O4 (M = divalent ion), are essential in advanced technology. Cadmium-substituted ferrite spinel with composition Ni1-xCdxFe2O4 (x = 0, 0.1, 0.15, and 0.2) was synthesized by the autocombustion method using citric acid as a fuel agent. X-Ray Diffraction (XRD) confirms that the spinel structure is present in the prepared nanocrystalline ferrites. Fourier Transformed Infrared Spectroscopy (FTIR) spectra showed intensive absorption bands in the 400-600 cm-¹ range corresponding to tetrahedral and octahedral sites. The absorption spectrum of FTIR shifts towards lower wave numbers as the Cd2+ ion concentration increases. Cd2+ ions doping is important for crystal growth, as evidenced by Scanning Electron Microscopy (SEM) images. The band gap energy values of Ni1-xCdxFe2O4 samples are 1.53 eV, 1.46 eV, 1 43eV, 1.42 eV for x=0-0.2, which indicates the samples absorb in visible light. Analysis of magnetic properties with Vibrating Sample Magnetometer (VSM) shows a small hysteresis loop, so Ni1-xCdxFe2O4 is a soft magnetic material. The dielectric constant increases as the Cd2+ ion concentration increases. The characterization outcomes recommend that the compounds can be used for several applications such as memory, and energy storage devices.
Sifat Adsorptif dan Termodinamika Ekstrak Lignin dari Pelepah Nipah (Nypa fruticans Wurmb) untuk Korosi Baja Lunak dalam Medium HCl Sartika, Hilda; Emriadi; Stiadi, Yeni; Suryati, Suryati
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.784-791.2024

Abstract

Research on the adsorptive and thermodynamic properties of lignin extract from Nipah fronds (Nypa fruticans Wurmb) for mild steel corrosion in hydrochloric acid medium has been conducted. The inhibititon effect of lignin extract from Nipah (Nypa fruticans Wurmb) fronds (LENF) on the corrosion of mild steel in HCl solution was studied by weight loss and optical microscopy methods. The results show that LENF was a good inhibitor in 1.0 M HCl, and the inhibition efficiency increases with increasing concentration of the extract and temperature. Inhibitive effect was afforded by the adsorption of the extract on the steel surface, which was found to accord with Langmuir adsorption isotherm. Adsorption and activation parameters such as activation energy (Ea), enthalpy (∆Η), free Gibbs energy (∆G), and entropy (∆S) were evaluated on the corrosion and inhibition process.
Pemanfaatan Ekstrak Daun Sirih Hijau (Piper Betle Linn.) sebagai Capping Agent dalam Green Synthesis Spinel Ferit ZnFe2O4 untuk Remediasi Fenol dalam Air dan sebagai Anti Bakteri Rahmayeni, Rahmayeni; Yuliani, Putri; Putri, Yulia Eka; Stiadi, Yeni
Jurnal Riset Kimia Vol. 15 No. 1 (2024): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i1.685

Abstract

The spinel ferrite material ZnFe2O4 was synthesized using a green synthesis approach by the hydrothermal method. In the synthesis, 2M NaOH was used as a mineralizer and betel leaf extract with varying volumes of 1, 3, 5, and 7 mL as a capping agent, then continued with calcination at 500, 600, and 700°C. Several devices, such as XRD, FT-IR, SEM-EDX, DRS-UV-Vis, and VSM, were used to characterize the synthesized ZnFe2O4 material. The pattern of XRD indicated that the ZnFe2O4 material has a cubic structure, where the increase in crystal size was after calcination. The Fourier Transform Infra-Red (FT-IR) spectrum shows the Fe-O interaction at wave numbers 427-417 cm-1, which is located on the octahedral side, while the Zn-O interaction at wave numbers 534-510 cm-1, which is located on the tetrahedral side in spinel ferrite structure. From the DRS UV-Vis spectrum pattern and band gap values, it was found that the material absorbs light in the visible region. Scanning Electron Microscope (SEM) images show that the morphology of the synthesized material is circular. The Vibrating Sample Magnetometer (VSM) hysteresis curve shows that the synthesized ZnFe2O4 has paramagnetic properties. The synthesized ZnFe2O4 material has photocatalytic activity towards phenolic compounds with a degradation percentage reaching 62.2%, and this material is active as an antibacterial with an inhibition area of 14.4 for S. aereus bacteria.
Perlindungan Baja Ringan Dalam Medium Asam Klorida Menggunakan Ekstrak Daun Sungkai (Peronema canescens Jack) Stiadi, Yeni; Emriadi; Rahmayeni; Yolanda, Putri; Della Rosalynna S.
Jurnal Kimia Unand Vol. 13 No. 1 (2024): May 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.1.22-30.2024

Abstract

Corrosion inhibition of mild steel in 1 M hydrochloric acid (HCl) by leaves extract of sungkai (Peronema canescens Jack) was studied by weight loss method, Fourier Transform Infra-Red (FTIR), spectroscopy UV-Vis, and optical microscopy. The corrosion rate of mild steel increase with the increase of temperature and decrease with the increase of concentration from leaves extract of sungkai in medium. The weight loss method shows that the inhibition efficiency increased with concentration and increases with temperature increase. The highest inhibition efficiency was 90.70% with the addition of 10 g/L extracts at 60ºC. The adsorption of the inhibitor on the surface of mild steel follows the Langmuir adsorption isotherm because it forms a monolayer. Analysis of FTIR and UV-vis spectroscopy showed an interaction between leaves extract of sungkai and mild steel surface. Optical microscopy analysis revealed differences in the surface of mild steel immersed in 1 M HCl medium with and without the addition of extract.  
The Effectiveness of Asystasia gangetica (L.) T. Anderson Leaf Extract as a Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Medium Ventika Sari, Karina; Emriadi; Yeni Stiadi
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 04 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss04/636

Abstract

 The inhibition effectiveness of the extract in hydrochloric acid solution was analyzed using the weight loss method at 30 °C for 7 hours to determine the corrosion rate and inhibition efficiency. The active compounds were identified through phytochemical tests, while the adsorption type was determined based on thermodynamic parameters. Characterization of surface changes on mild steel was carried out using UV-Vis spectroscopy and Field Emission Scanning Electron Microscopy (FESEM). The results revealed the presence of flavonoids, alkaloids, steroids, triterpenoids, and phenolics, which contribute to the adsorption process on the mild steel surface. The lowest corrosion rate was obtained at a concentration of 8 g/L, namely 0.43 mg/cm².h, with the highest inhibition efficiency of 73.42%. The R² value approaching 1 follows the Langmuir adsorption isotherm, with a  value of -23.79, indicating that EDAG molecules are adsorbed on the mild steel surface through mixed adsorption. Surface morphology analysis showed a smoother steel surface after immersion in the inhibitor solution, indicating the formation of a protective layer. Thus, compared to previous studies, EDAG exhibits higher inhibition efficiency and demonstrates potential as an environmentally friendly corrosion inhibitor alternative.
Co-Authors Admi Admi Della Rosalynna S. Della Rosalynna S. Emil Salim Emriadi Emriadi - Famella Azhara Geliz Luh Titisari Herlin Oktavani Hermansyah Aziz Hilda Sartika Ida Ayu Putu Sri Widnyani Libra, Poppi Darmila Mai Efdi Mai Efdi MUHAMMAD ILHAM Oktavani, Herlin Pradiwi, Nailatul Zahrah Putri Yolanda Rahmayeni Rahmayeni Rahmayeni Rianda Rizal Rohil Sartika, Hilda Savira Nurul Hayuni Solly Aryza Suryati Suryati Suryati Syafrizayanti Syafrizayanti Syukri Arief Syukri Syukri Tio Putra Wendari Ventika Sari, Karina Wellia, Diana Vanda YOLANDA, PUTRI Yulia Eka Putri Yulia Eka Putri, Yulia Eka Yuliani, Putri Zulhadjri Zulhadjri