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I W. Sutapa
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kampus Hijau Bumi Tridharma, Anduonohu, Kendari, Sulawesi Tenggara 93232, Indonesia
Chemistry Materials Science & Nanotechnology Physics

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Analysis of Water Quality in Sea Waters After The Sea Snot Occurrence in Bima Bay West Nusa Tenggara S. Kasim; N. A. Pratiwi; H. Natsir; S. Liong; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.12

Abstract

The incident that occurred in April 2022 in Bima Bay was a phenomenon that shocked the residents of Bima City and outside the Bima area. Based on previous laboratory tests, the cause is Sea Snot which is accompanied by an explosion in the number and metabolism of algae. The entry of organic and inorganic pollutants into water bodies can cause water quality to experience degradation in biological function. This research aims to analyze water quality in marine waters with the parameters BOD, COD, DO, determine the Nitrate and Phosphate content and characterize total coliform and E. coli bacteria in marine waters. This research uses electrometric, photometric and membrane filtrate methods. pH ranged from 7.85 - 8.22; DO levels 5.97 - 6.15 mg / L, BOD 1.3, and 5 ranged from 5.52 - 9.06 mg / L. COD levels 15.62 - 21.44 mg / L. Nitrate ranges from 0.124 - 0.204 mg/L. Phosphate ranges from 0.27 - 0.41. Total coliform bacteria ranges from 706 - 1,266 colonies/100 mL and E. coli 0.75 - 1.75 colonies/100 mL. The water quality in the sea waters of Bima Bay has mostly met the sea water quality standards for the parameters BOD, DO, total coliform, E. coli , while the COD parameter is not included in the mandatory parameters which are one of the indicators of sea water pollution. The content of Nitrate and Phosphate in the waters of Bima Bay shows that its value has exceeded the sea water quality standards.
Mesoporous Silica (MCM-48) as an Adsorbent for Methylene Blue Dye P. Taba; Nariskawati; A. H. Kasim; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.14

Abstract

Research on the synthesis of mesoporous silica (MCM-48) has been conducted, with the material being utilized as an adsorbent for methylene blue (MB) dyes. The synthesis of MCM-48 was performed via a hydrothermal method, employing Ludox HS40 as the silica source and a mixture of CTAB and Triton X-100 as the templating agents. The surfactants were subsequently removed through washing with HCl-ethanol. Characterization of the synthesized material was achieved using techniques such as X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transform Infra-Red (FTIR) spectroscopy, and the Barrett-Joyner-Halenda (BJH) method. The MCM-48 materials utilized for MB adsorption included MCM-48 without prior washing (MCM-48-TC) and MCM-48 subjected to a single wash with HCl-ethanol (MCM-48-C1). Adsorption experiments for MB were conducted while varying the contact time to identify optimal conditions at neutral pH (6), and the adsorption capacity was assessed by performing adsorption at different concentrations under these optimal conditions. Isothermal adsorption was evaluated using the Langmuir and Freundlich isothermal models. The concentration of Methylene Blue post-adsorption was determined using a UV-Vis spectrophotometer at a wavelength of 660 nm. The results indicated that MCM-48 is an effective adsorbent for MB dye; the optimal adsorption time for MCM-48-TC was found to be 75 minutes, whereas for MCM-48-C1, it was 90 minutes. Adsorption by both MCM-48-TC and MCM-48-C1 conformed to the Freundlich isothermal model, with adsorption capacities of 1.4447 mg/g and 2.3900 mg/g, respectively.
Co-Authors A. H. Kasim H. Natsir N. A. Pratiwi Nariskawati P. Taba S. Kasim S. Liong