Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Anggaran: Jurnal Publikasi Ekonomi dan Akuntansi
Mariani Mariani
Universitas Tanjungpura
Astronomy Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Utilization of Zn Powder as a Precursor in Synthesis of rGO/ZnO Composite for Decolorization of Batik Wastewater Dwiria Wahyuni; Mariani Mariani; Asifa Asri; Ya Muhammad Arsyad
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 15 No. 1 (2025)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v15n1.p12-26

Abstract

Batik wastewater contains high concentrations of synthetic dyes, significantly contributing to aquatic pollution. Photocatalysis is a promising method for degrading such dyes in textile effluents. This study aims to develop rGO/ZnO composites using zinc (Zn) powder as a precursor for photocatalytic applications. Reduced graphene oxide (rGO) was used as a substrate for ZnO particle formation. The composites were prepared by reacting Zn powder with rGO at varying loadings (5% and 10% by mass) in a neutral aqueous solution, followed by thermal treatment at 250 °C for 1 hour to facilitate Zn oxidation. The photocatalytic performance was evaluated by applying different masses of rGO/ZnO (0.2, 0.4, and 0.8 g) to degrade batik wastewater. Surface morphology and elemental composition were characterized using SEM-EDS. SEM analysis showed that rGO has a sheet-like structure, while ZnO exhibits spherical morphology. EDS confirmed the presence of Zn, C, and O as major elements with Nb impurity was identified in the composite. The carbon-to-oxygen (C/O) ratio increased after composite formation, reaching 4.23 for rGO/ZnO 5% and 3.79 for rGO/ZnO 10%. XRD characterization of rGO/ZnO confirms the presence of ZnO in the composite, with residual Zn peaks indicating incomplete oxidation of the Zn precursor. Photocatalytic activities modeled using pseudo-first-order kinetics reveal the 10% rGO/ZnO composite (0.8 g) shows the degradation efficiency of 67.91%, with a rate constant of 0.1623 h⁻¹. The efficiency may be affected by the complex nature of batik wastewater, particularly wax and resin residues that hinder photocatalytic activity. In conclusion, these findings highlight the potential of Zn powder as a precursor in the synthesis of rGO/ZnO composites with concentration of rGO and the mass variation of rGO/ZnO in the treatment of Batik wastewater affect the photocatalytic activity.
Pengaruh Pengungkapan Environmental, Social, and Governance terhadap Net Interest Margin dengan Firm Size sebagai Variabel Moderasi pada Bank Konvensional pada Periode 2023-2025 Mariani Mariani; Syarif M.Helmi; Vitriyan Espa
Anggaran : Jurnal Publikasi Ekonomi dan Akuntansi Vol. 4 No. 3 (2026): September : Anggaran : Jurnal Publikasi Ekonomi dan Akuntansi
Publisher : Asosiasi Riset Ekonomi dan Akuntansi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/anggaran.v4i3.2567

Abstract

This study aims to analyze the effect of Environmental, Social, and Governance (ESG) disclosure on Net Interest Margin (NIM), with Firm Size as a moderating variable in conventional banks during the 2023–2025 period. This study employed a quantitative approach with an associative research design. The data consisted of secondary data obtained from annual reports, sustainability reports, and financial statements of 13 conventional banks listed on the Indonesia Stock Exchange. Purposive sampling was used to select the research sample, while data analysis was conducted using Moderated Regression Analysis (MRA) with the assistance of IBM SPSS Statistics. The results show that Social and Governance factors have a significant effect on Net Interest Margin, whereas the Environmental factor does not have a significant effect. Firm Size is able to moderate the effects of Social and Governance factors on Net Interest Margin, but it does not moderate the effect of the Environmental factor. These findings indicate that the implementation of ESG, particularly Social and Governance aspects, plays an important role in improving banking profitability through greater operational efficiency and stronger trust among customers and other stakeholders. The findings also suggest that larger banks can strengthen the positive contribution of Social and Governance practices to NIM. Therefore, banks are encouraged to improve ESG implementation, especially in Social and Governance aspects, while considering company size in developing sustainable banking strategies.
Co-Authors Asifa Asri Dwiria Wahyuni Syarif M.Helmi Vitriyan Espa Ya Muhammad Arsyad