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Spatial distribution of micronutrients in Pekalongan coastal waters: water quality and environmental impact assessment Andreas, Roy; Megasari, Intan; Tricahyo, Bayu; Trenggono, Mukti; Haryanto, Michael Julian
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 14, No 1 (2025): MARCH 2025
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.14.1.42741

The coastal areas of Pekalongan, which are densely populated with activities such as ports, industries, and settlements, are highly vulnerable to changes in water quality due to nutrient distribution. This study aims to explore the distribution patterns and abundance of micronutrients in Pekalongan coastal and their implications for water quality and environmental impacts. Samples were taken from Mrican River, Pencongan River, and Wonokerto Beach. The analysis involved spatial distribution, statistical tests with Principal Component Analysis (PCA), and water quality assessment using CCME-WQI. The results showed that the highest concentrations of micronutrients were found in iron in RW 6 of Mrican River, copper in SW 4 of Wonokerto Beach, and zinc in SW 5 of Wonokerto Beach. Based on the CCME-WQI, the quality of Pekalongan coastal waters is classified as poor, potentially posing a great risk to aquatic biota and the health of humans who consume polluted biota. These findings underscore the urgency of taking mitigation measures against micronutrient contamination in coastal areas.Keywords:Pekalongan CoastSpatial DistributionMicronutrientWater QualityCoastal Waters

Spatial distribution of micronutrients in Pekalongan coastal waters: water quality and environmental impact assessment Andreas, Roy; Megasari, Intan; Tricahyo, Bayu; Trenggono, Mukti; Haryanto, Michael Julian
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 14, No 1 (2025): MARCH 2025
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.14.1.42741

The coastal areas of Pekalongan, which are densely populated with activities such as ports, industries, and settlements, are highly vulnerable to changes in water quality due to nutrient distribution. This study aims to explore the distribution patterns and abundance of micronutrients in Pekalongan coastal and their implications for water quality and environmental impacts. Samples were taken from Mrican River, Pencongan River, and Wonokerto Beach. The analysis involved spatial distribution, statistical tests with Principal Component Analysis (PCA), and water quality assessment using CCME-WQI. The results showed that the highest concentrations of micronutrients were found in iron in RW 6 of Mrican River, copper in SW 4 of Wonokerto Beach, and zinc in SW 5 of Wonokerto Beach. Based on the CCME-WQI, the quality of Pekalongan coastal waters is classified as poor, potentially posing a great risk to aquatic biota and the health of humans who consume polluted biota. These findings underscore the urgency of taking mitigation measures against micronutrient contamination in coastal areas.Keywords:Pekalongan CoastSpatial DistributionMicronutrientWater QualityCoastal Waters

Physicochemical Characteristics of PVDF/ZSM-5 Composite Membrane for Potential Applications in Vanadium Redox Battery Alifia, Zaskia; Haryanto, Michael Julian; Fitriyani, Devi Ayu; Riapanitra, Anung
Jurnal Kimia Sains dan Aplikasi Vol 28, No 6 (2025): Volume 28 Issue 6 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.6.299-306

Composite membranes were synthesized using poly-(vinylidene fluoride) (PVDF) and zeolite (ZSM-5) to improve the performance of PVDF as a battery separator. The PVDF-ZSM-5 membranes, prepared with varying concentrations of ZSM-5, underwent characterizations of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). These analyses revealed a notable increase in β-phase formation in PVDF, greater porosity, and improved surface morphology due to the incorporation of ZSM-5. Evaluations of their physicochemical properties showed that these membranes resulted in electrical conductivity up to 96.4 mS/cm, enhanced contact area, porosity reaching 78.61%, and flux value up to 5.4 ×10⁻2 L m⁻2 h⁻2. Adjustments in ZSM-5 concentrations proved instrumental in fine-tuning these performance metrics. These findings highlight the potential of PVDF-ZSM-5 membranes as a cost-effective membrane separator for redox battery systems. This research lays the groundwork for future advancements and broader commercial applications in energy storage technology.

Hydrothermal and Coprecipitation Synthesis Design of BiVO4 for Methylene Blue Degradation Riapanitra, Anung; Setyaningtyas, Tien; Haryanto, Michael Julian; Haryadinaru, Ghinatanitha Haqqu
Jurnal Riset Kimia Vol. 16 No. 1 (2025): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v16i1.740

This study investigated the characteristics and photocatalytic activity of BiVO4 photocatalyst synthesized using hydrothermal and coprecipitation methods for methylene blue (MB) degradation under visible light. The variation of synthesis parameters, including pH, calcination temperature, and pH of MB solution, affects the crystal structure, morphology, and photocatalytic efficiency of the material. XRD characterization results show that the hydrothermal method produces BiVO4 with pure scheelite(m-s) monoclinic phase and high crystallinity, while the coprecipitation method produces a combination of scheelite(m-s) monoclinic and orthorhombic Bi4V2O11 phases, which contributes to enhanced photocatalytic activity through better charge separation. The average crystal size of the hydrothermal method is 17.85 nm, larger than that of coprecipitation (11.41-14.71 nm), which gives the coprecipitated material a surface area advantage. SEM analysis showed rod-like morphology in hydrothermal, while coprecipitation produced sphere-grape-like particles. UV-Vis DRS results show that hydrothermal synthesized BiVO4 has a band gap energy of 2.28 eV, smaller than BiV(4)(400) (2.46 eV) and higher than BiV(4)(550) (2.07 eV) synthesized using coprecipitation method. This smaller band gap energy indicates that the interaction of Bi³⁺ and VO₄³- ions in the hydrothermal material is better, thus favoring visible light absorption. The highest photocatalytic activity was obtained from the coprecipitated material with a degradation efficiency of 89.32% at pH 11 within 150 min, higher than the hydrothermal material which reached 76.06% under similar conditions. This photocatalytic activity was dominated by OH* and O2-* radicals, which play a role in MB degradation. This study shows that designing synthesis pH parameters (4-7), calcination temperature (400), and coprecipitation method produced a material with optimum photocatalytic performance, making BiVO4 a superior candidate for colored wastewater treatment applications.

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