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All Journal IJEMS (Indonesian Journal of Environmental Management and Sustainability) Journal of Natural Sciences Indonesian Journal of Chemical Science
Musifa, Eva
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Agriculture, Biological Sciences & Forestry Chemistry Decision Sciences, Operations Research & Management Energy Environmental Science Physics Public Health

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Preparation and Application of Biochar from Areca catechu L. Peel for Malachite Green and Reactive Blue Dyes Removal Palapa, Neza Rahayu; Putra, M. Bagus Kurnia; Musifa, Eva; Yuliasari, Nova; Adawiyah, Robiatul
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 1 (2025): March
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.1.28-35

Abstract

 The utilization of Areca catechu L. fruit peel waste as biochar offers a sustainable solution for waste management while enhancing the material’s value as an efficient adsorbent. Biochar from Areca catechu L. fruit peels was processed through pyrolysis for 2 hours at temperature of 500oC. This study investigates the use of biochar from Areca catechu L. peel as an adsorbent for Malachite Green (MG) and Reactive Blue (RB) dyes in a batch system, with a focus on analysing the kinetic adsorption processes. The biochar was characterized using XRD, FTIR, SEM and BET. BET analysis was conducted, which shows that the surface area of biochar from Areca catheca L. fruit peel after pyrolysis treatment was 29.52 m2/g. The adsorption of MG by the biochar from Areca catechu L. peels was found to be greater than that of RB. The biochar showed an adsorption capacity of 16.113 mg/g for MG, while its capacity for RB was 15.499 mg/g. The adsorption process of biochar from Areca catechu L. peels for both MG and RB dyes follows a pseudo-second-order kinetic model.
Perbandingan Pertumbuhan dan Produksi Karotenoid pada Mikroalga Chlorella Vulgaris dan Chlorella Pyrenoidosa Musifa, Eva
Journal of Natural Sciences Vol 6, No 3 (2025): Journal of Natural Sciences November
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v6i3.999

Abstract

Microalgae are a potential source of biological biomass due to their ability to produce various bioactive compounds. This study aims to analyze the growth curves and carotenoid content of two microalgae Chlorella Vulgaris and Chlorella Pyrenoidosa, to evaluate their potential as natural carotenoid sources. Microalgae cultures were cultivated in two different types of media, namely F1/2 Guillard and Walne. Growth monitoring was carried out by measuring dry biomass and cell density at a wavelength of 680 nm, while carotenoid content was analyzed spectrophotometrically at wavelengths of 470, 652, and 665 nm. All experiments were carried out in triplicate (n = 3) to obtain representative. The results showed that both species have distinctive growth patterns with different logarithmic phases. Chlorella Vulgaris showed a higher growth rate than Chlorella Pyrenoidosa, namely 0.80 ± 0.013 g/L and 0.43 ± 0.002 g/L for each microalgae. In addition, Guillard's F1/2 medium was proven to be more effective in supporting microalgae growth and carotenoid production in both microalgae strains, namely 0.653±0.018 µg/g for Chlorella Vulgaris and 0.436±0.049 µg/g for Chlorella Pyrenoidosa with a sig p value 0.05. These findings indicate that the selection of appropriate species and culture medium greatly influences microalgae productivity.
Processing of Tofu industrial wastewater by electrocoagulation method using aluminum (Al) electrode at various electrical current and contact time Rachmat, Addy; Fatma, Fatma; Pratama, Nisa Manora; Musifa, Eva
Indonesian Journal of Chemical Science Vol. 14 No. 1 (2025): Indonesian Journal of Chemical Science
Publisher : Prodi Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v14i1.18787

Abstract

This research aims to determine the effect of varying voltage and contact time on reducing levels on Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and ammonia as well as increasing pH values ​​in tofu industrial wastewater by electrocoagulation using Aluminum electrodes. There were 4 variations of voltage (10,20,30,4 0A) and 5 variations of contact time (30,60,90,120,150 minutes). Analysis of COD levels and ammonia levels was carried out using a UV-Vis spectrophotometer, analysis of TSS levels gravimetrically using Whatman filter paper No. 42, analysis of TDS levels with gravimetrically, and analysis of pH values ​​by a pH meter. The best results were obtained from treatment at voltage of 40 A and a contact time of 150 minutes with the highest efficiency of reducing COD, TSS, TDS, ammonia levels respectively at 90.35; 92; 66; 85% and the highest increase in pH value was 108%. The results of the diversity analysis or Tukey's advanced test showed that at the 5% level each treatment had a significant effect on reducing COD, TSS, TDS and ammonia levels as well as increasing the pH value. Chemical kinetics analysis of the reduction in COD and TSS levels showed results that were close to first orde linear and obtained R2 and k values ​​respectively of (0.9904; 0.0164); (0.9952; 0.0182) at voltage variation of 40 A
Microalgae-Based Wastewater Treatment as Green Solution for Sustainable Degradation and Its Challenges: A Review Musifa, Eva; Palapa, Neza Rahayu; Ahadito, Bijak Riyandi
Indonesian Journal of Environmental Management and Sustainability Vol. 9 No. 4 (2025): December
Publisher : Magister Program of Material Science, Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijems.2025.9.4.171-182

Abstract

Releasing polluted water directly into the environment causes serious problems because it contains harmful substances that can damage aquatic life and human health. To reduce these risks, it is important to treat and clean wastewater effectively. Microalgae have shown promise as a natural and sustainable way to treat wastewater. The microalgae help to remove pollutants and can also recover useful resources and energy from the water. The study used a systematic review methodology to identify and evaluate the role of microalgae wastewater treatment. The method was used since it provides a structures and transparent framework for selection, assessment and synthesize of evidence from relevant literature. This review highlights the benefits of using microalgae for wastewater treatment, as well as the challenges involved. Ongoing research focuses on improving these methods, including combining microalgae with bacteria to make the process more efficient and scalable. Despite some difficulties like contamination risks and regulatory issues, future advances especially in genetic engineering and hybrid systems are expected to improve microalgae-based wastewater treatment and make it a key tool for protecting the environment, while multidisciplinary collaboration combining molecular biology research, environmental engineering, public policy, and utilization of this technology at the industrial and societal levels that should be under consideration.
Co-Authors Addy Rachmat Bijak Riyandi Ahadito Fatma Nova Yuliasari Pratama, Nisa Manora Putra, M. Bagus Kurnia Robiatul Adawiyah