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All Journal Jurnal Ilmu Pendidikan Indonesia Lensa Ekonomi
Hayati, Ismi
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Biochemistry, Genetics & Molecular Biology Chemistry Economics, Econometrics & Finance Education Mathematics Physics

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SYNTHESIS AND CHARACTERIZATION OF MONTMORILLONITE/TiO2 COMPOSITES AS A PHOTOCATALYST IN REDUCING BOD AND COD OF DOMESTIC WASTEWATER Hayati, Ismi; Bawa Putra, Anak Agung; Sutha Negara, I Made
Jurnal Ilmu Pendidikan Indonesia Vol 12 No 1 (2024): JURNAL ILMU PENDIDIKAN INDONESIA
Publisher : Master of Science Education Program, Postgraduate Program of Cenderawasih University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31957/jipi.v12i1.2535

Abstract

The development of hotels in Bali is increasing every year, this is directly proportional to the number of tourists and the waste generated. Hotel liquid waste has the potential to pollute the environment if there is no pre-disposal treatment. This study aims to obtain the best MMT/TiO2 composite that acts as an adsorbent and photocatalytic in reducing BOD (Biological Oxygen Demand) and COD (Chemical Oxygen Demand) levels of domestic wastewater. Composite synthesis was carried out by combining the top-down method, ball milling, and sonication. The ball milling method is used to produce montmorillonite, which has a smaller size, with a ball mass to sample mass ratio of 2:1 at a speed of 250 rpm. Variations in milling times of 0, 2, 4, and 6 hours were applied to determine the effect of milling time. The sonication method was used to obtain a smaller TiO2 particle size by exposing it to ultrasonic waves for 30 minutes. Calsination of the composite was carried out at a temperature of 400 °C. The results of composite characterization using the PSA (Particle Size Analyzer) showed that the composite did not meet the nanoparticle requirements because it had a particle size > 100 nm with a PI value > 0.5, which was still classified as polydispersity. NMT 6 has the best PI value of 0.65, which is then used to determine the optimum composite time to reduce BOD and COD levels. The optimum irradiation time obtained from composites in degrading waste is 90 minutes, which can reduce BOD levels by 78.53% and COD levels by 69%. The ability of composites NMT-6 to reduce BOD and COD levels is greater than that of montmorillonite and TiO2.
PENGARUH KUALITAS PRODUK, HARGA DAN MEREK TERHADAP KEPUTUSAN PEMBELIAN PRODUK TAS, JAKET DAN SEPATU EIGER ( STUDI KASUS PADA MAHASISWA KEHUTANAN UNIVERSITAS PAPUA) Heipon, Samuel Z; Bajari, Makarius; Hayati, ismi
Lensa Ekonomi Vol 18 No 01 (2024): Lensa Ekonomi
Publisher : Fakultas Ekonomi dan Bisnis, Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/lensa.v18i01.363

Abstract

This research aims to analyze product quality, price and brand variables on purchasing decisions for Eiger bags, jackets and shoes among students at the Faculty of Forestry, University of Papua. The type of research used is a qualitative approach to associative types of problems. The population in the research were students of the Faculty of Forestry, University of Papua who had used Eiger products in student activities and the sample in the research was 73 respondents using the Slovin method as a sampling method. The data collection method uses primary data, namely observation, interviews and questionnaires and secondary data, namely books, journals, articles and internet sites. This research instrument uses a Likert scale with a data analysis method, namely multiple linear regression analysis. The results of this research show that the independent variable, namely product quality, has no effect on purchasing decisions, but the other two independent variables, price and brand, have a partially significant effect on purchasing decisions and the results of simultaneous testing of the independent variables, namely product quality, price and brand, simultaneously influence purchasing decisions. Eiger bags, jackets and shoes.
Co-Authors A. A. Bawa Putra Bajari, Makarius Heipon, Samuel Z I Made Sutha Negara