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Limestone Industry on PM2.5 Air Quality in Padalarang and Surrounding Areas Yuningsih, Nani; Simbolon, Luga Martin; Hidayat, Syarif; TRITJAHJONO, Rachmad Imbang; Sumeru, Husain Akbar; Raji, Lukman
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 1 (2024): February 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i1.140

The processing of limestone through the combustion process will cause air pollution at the combustion site and its surroundings. At the limestone processing site, Padalarang experiences relatively high air pollution. PM2.5 is one of the main pollutants produced by limestone burning, so it is very necessary to study the concentration of PM2.5 in the air in Padalarang and its surroundings. This study was conducted in Padalarang and its surroundings, where data collection was carried out in five locations, namely at the center of limestone burner, 1 km, 2 km, 3 km, and 4 km to the east of the burning center. Data collection was carried out for ten days, where each data collection was carried out for 12 hours, from 07.00 to 19.00. Based on the national standard of PPRI No. 22 of 2021, which is 55 µg/m3, the concentration in the limestone burning center and 1 km from burning center have exceeded the standard, which is 82.5 and 69.3 µg/m3. While PM2.5 concentrations at distances of 2 km, 3 km, and 4 km are below the national standard, namely 52.0, 51.6 and 50.2 µg/m3, respectively. Based on the Air Quality Index (AQI), the AQI at the burning center, distance of 1 km, 2 km, 3 km, and 4 km are Unhealthy, Unhealthy, Moderate, Moderate and Moderate, respectively. This means that areas less than 1 km away are not healthy places to live. The poor air quality in Padalarang is reflected in the much higher number of ARI cases compared to the surrounding sub-districts that do not have a limestone industry.

Green Synthesis of Zinc Oxide Particles using Banana Peels and Tea Leaves Extracts for Rhodamine B Photodegradation Pratomo, Uji; Fransisca, Natasha; Afriani, Zahra; Sinambela, Ayu Jelita; Zahra, Nazwa Alya; Suwarno, Nelson Indarto; Sumeru, Husain Akbar; Kurnia, Irwan; Primadona, Indah; Edwin, Rudiawan
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.41793

Rhodamine B is a widely used dye in the textile sector. However, the wastewater produced during the dyeing process presents a notable source of pollution, contaminating water and posing a threat to aquatic ecosystems due to its presence in liquid waste. Photocatalysis is a technique for breaking down toxic textile dye waste a semiconductor as a catalyst, valued for its high sensitivity and eco-friendly nature. In this research, zinc oxide particles were synthesized via a green synthesis approach using precipitation, employing natural capping agents from banana peel and tea leaf to degrade the synthetic dye of rhodamine B. The catalyst material was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and ultraviolet-visible diffuse reflectance (UV-DRS). The photodegradation performance of rhodamine B was determined under UV light exposure for 3 hours. The XRD spectra of ZnO show the specific peaks of 2θ at 31.8°, 34.5°, and 36.3° with a crystallinity value of around 79.50%. The SEM result shows that the morphology of ZnO is in cotton-like form with a minimum band gap of 3.17 eV. The cotton-like ZnO particles demonstrated superior photodegradation efficiency for Rhodamine B, achieving 61.8%, compared to 47.9% with pure ZnO. It suggests that synthesizing ZnO particles with banana peels and tea leaf extracts boosts photodegradation efficiency by up to 20% compared to pure ZnO. This research highlights the potential of utilizing eco-friendly and sustainable methods as a greener approach for reducing waste in environmental applications.

Pengaruh Perlakuan Awal, Variasi Suhu Pemanasan Serta Inokulasi Terhadap Viskositas Yoghurt Sumeru, Husain Akbar; Latifah, Rina Gaida; Nurrusyda, Fajriana Shafira; Ishmayana, Safri
Kimia Padjadjaran Vol 3, No 1 (2024)
Publisher : Kimia Padjadjaran

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Yoghurt merupakan produk fermentasi susu yang banyak digemari karena cita rasa, tekstur, manfaat kesehatannya serta dapat dikonsumsi oleh individu yang intoleransi laktosa. Mutu yoghurt dinilai berdasarkan beberapa parameter penting yang berkaitan dengan stabilitas dan daya terima produk di masyarakat, salah satunya yaitu viskositas. Viskositas dipengaruhi faktor-faktor seperti proses perlakuan awal pada susu, suhu pemanasan, dan suhu inokulasi. Oleh karena itu, penelitian ini bertujuan untuk menyelidiki ketiga faktor tersebut terhadap viskositas yoghurt. Parameter penelitian yang digunakan adalah perlakuan awal susu (UHT, pasteurisasi, dan susu murni), suhu pemanasan (60℃, 70℃ dan 80℃), serta suhu inokulasi (30℃, 35℃, dan 40℃). Hasil fermentasi diukur dengan menggunakan viskometer Ostwald, kemudian data dianalisis secara deskriptif dan komparatif. Hasil menunjukkan bahwa suhu pemanasan 80℃ dan suhu inokulasi 40℃ menghasilkan viskositas tertinggi, dengan nilai tertinggi diperoleh pada susu murni sebesar 301,93 cP. Susu pasteurisasi dan UHT menunjukkan nilai viskositas yang lebih rendah, masing-masing 111,79 cP dan 88,82 cP. Penurunan viskositas juga diamati seiring dengan menurunnya suhu pemanasan dan inokulasi. Temuan ini mengindikasikan bahwa perlakuan awal susu dan perlakuan termal yang optimal berperan penting dalam membentuk emulsi yang menentukan kekentalan yoghurt.

Analisis Kualitatif Bakteri Koliform pada Air Kemasan dengan Metode Most Probable Number Nurrusyda, Fajriana Shafira; Mawalia, Khiftul; Hasriani, Shela Amelia; Shahab, Ali Ridho; Tambunan, Clara Junita; Budiman, Mulydayana Reanifah; Harahap, Winni Suryani; Gobel, Khaeriska Rahayu; Ishmayana, Safri; Sumeru, Husain Akbar
Kimia Padjadjaran Vol 3, No 1 (2024)
Publisher : Kimia Padjadjaran

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Air merupakan sumber daya utama bagi kehidupan manusia yang digunakan untuk konsumsi, rumah tangga, dan industri. Kualitas mikrobiologis air minum perlu diawasi karena keberadaan bakteri indikator koliform mencerminkan kontaminasi fekal dan risiko penyakit. Berdasarkan Peraturan Menteri Kesehatan Republik Indonesia No. 2 Tahun 2023, air minum yang aman tidak boleh mengandung bakteri koliform dalam 100 mL sampel. Penelitian ini bertujuan untuk menganalisis keberadaan Escherichia coli pada air minum isi ulang menggunakan metode Most Probable Number (MPN), yaitu metode estimasi jumlah bakteri secara statistik berdasarkan jumlah tabung positif pada seri pengenceran tertentu. Uji dilakukan melalui dua tahap yaitu uji penduga untuk mendeteksi keberadaan bakteri koliform melalui pembentukan gas akibat fermentasi laktosa, dan uji konfirmasi untuk memastikan keberadaan E. coli pada media diferensial. Hasil uji penduga menunjukkan adanya gas pada satu tabung LB 2X (10 mL) dan satu tabung LB 1X (1 mL), sedangkan pada tabung LB 1X (0,1 mL) tidak terbentuk gas. Kombinasi hasil 1–1–0 menunjukkan estimasi MPN sebesar 3 bakteri/100 mL, yang termasuk kontaminasi rendah. Pada uji konfirmasi, koloni dengan warna ungu kehitaman dan kilau logam hijau pada media EMB teridentifikasi sebagai E. coli. Dengan demikian, sampel air minum isi ulang mengandung E. coli dan tidak memenuhi syarat sebagai air minum layak konsumsi.

Green Synthesis of Zinc Oxide Particles using Banana Peels and Tea Leaves Extracts for Rhodamine B Photodegradation Pratomo, Uji; Fransisca, Natasha; Afriani, Zahra; Sinambela, Ayu Jelita; Zahra, Nazwa Alya; Suwarno, Nelson Indarto; Sumeru, Husain Akbar; Kurnia, Irwan; Primadona, Indah; Edwin, Rudiawan
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.41793

Rhodamine B is a widely used dye in the textile sector. However, the wastewater produced during the dyeing process presents a notable source of pollution, contaminating water and posing a threat to aquatic ecosystems due to its presence in liquid waste. Photocatalysis is a technique for breaking down toxic textile dye waste a semiconductor as a catalyst, valued for its high sensitivity and eco-friendly nature. In this research, zinc oxide particles were synthesized via a green synthesis approach using precipitation, employing natural capping agents from banana peel and tea leaf to degrade the synthetic dye of rhodamine B. The catalyst material was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and ultraviolet-visible diffuse reflectance (UV-DRS). The photodegradation performance of rhodamine B was determined under UV light exposure for 3 hours. The XRD spectra of ZnO show the specific peaks of 2θ at 31.8°, 34.5°, and 36.3° with a crystallinity value of around 79.50%. The SEM result shows that the morphology of ZnO is in cotton-like form with a minimum band gap of 3.17 eV. The cotton-like ZnO particles demonstrated superior photodegradation efficiency for Rhodamine B, achieving 61.8%, compared to 47.9% with pure ZnO. It suggests that synthesizing ZnO particles with banana peels and tea leaf extracts boosts photodegradation efficiency by up to 20% compared to pure ZnO. This research highlights the potential of utilizing eco-friendly and sustainable methods as a greener approach for reducing waste in environmental applications.

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