Seashells waste is abundant in coastal area, especially in the locations where fisheries are a major occupation. This abundant resource of seashells opens a new opportunity further utilization. Seashells waste is a source of CaCO 3 , which may be converted into CaO via the calcination process. This study analyzed the characteristics of the CaO produced via calcination process at different temperature and calcination time. The calcination process was carried out at a temperature of 800°C, 900°C, and 1000°C with variation of 2, 3, and 4 hours in time. The Fourier transform infrared spectroscopy (FTIR) result showed that the spectrum of 2513 cm -1 as an indication of the C-H group containing CaO appearing after calcination. The FTIR results suggest that the calcination time did not gave major alteration to the functional groups. The results of X-ray diffraction (XRD) analysis showed that CaO laid at the angle of 58.1 o and 64.6 o . Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS) results showed that the most significant compositional outcome after the calcination process was Ca and O at all temperatures and calcination times. All calcined seashells showed rough surface and irregular shape particles. The result of a Thermogravimetric analysis (TGA) suggested that the highest mass alteration occurred at a temperature of 800°C with 78 mins of calcination time.
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ABSTRAKSekarang ini, diramaikan dengan isu Corona Virus Disease-2019 atau yang biasa disingkat dengan Covid-19. Kasus asal coronavirus pertama kali ditemukan di Kota Wuhan, China. Termasuk salah satunya di Indonesia awal kasus kesehatan ini ditemukan di Depok, Jakarta pada 02 Maret 2020. Begitu juga Kabupaten Karawang yang saat ini merupakan zona hitam (kasus Covid-19 kian menambah setiap harinya). Tujuan dalam penilitian ini yaitu pembuatan drone untuk penyemprotan disinfektan. Di karenakan disinfektan sendiri merupakan bahan senyawa aktif yang dapat meminimalisir terpaparnya Covid-19. Metode pengabdian yang dilakukan dengan cara pendekatan kualitatif. Hal ini dilakukan untuk kajian literatur yang menjadi parameter dalam penggunaan drone. Hasil yang ditawarkan dalam pengabdian ini guna mencegah bertambahnya kasus positif Covid-19, khususnya di Kabupaten Karawang. Di harapkan penyebaran Covid-19 dapat diminimalisir dengan cara penyemprotan disinfektan melalui drone. Selain itu drone yang digunakan dapat terintegrasi oleh sistem internet of things (IoT). Dengan tujuan agar dalam penggunaannya dapat dengan mudah diarahkan sesuai kebutuhan. Kata kunci:covid-19; drone; disinfektan; internet of things. ABSTRACTCurrently, it is enlivened by the issue of Corona Virus Disease-2019 or commonly abbreviated as Covid-19. The case of the origin of the coronavirus was first found in Wuhan City, China. Including one of them in Indonesia, the initial health case was found in Depok, Jakarta on March 02, 2020. Likewise, Karawang Regency is currently a black zone (Covid-19 cases are increasing every day). The purpose of this research is to make drones for spraying disinfectants. This is because disinfectants are active compounds that can minimize exposure to Covid-19. The research method used is a qualitative approach. This is done for a literature review which is a parameter in using drones. The results offered in this study are to prevent an increase in positive cases of Covid-19, especially in Karawang Regency. It is hoped that the spread of Covid-19 can be minimized by spraying disinfectants through drones. In addition, the drones used can be integrated by the internet of things (IoT) system. With the aim that in use it can be easily directed as needed. Keywords: covid-19; drone; disinfectans; internet of things.
Cellulose is one of the largest components in corncobs. Cellulose was obtained from corncob in this research that has a yield of 19.6% of 20 grams of corncob powder. The isolated cellulose was characterized by using FTIR and SEM. Cellulose has crystalline chain and insoluble in water or organic solvents. The molecular chain of cellulose is linear and has intra- and inter-molecular hydrogen bonds. One way for cellulose to be easy in the treatment of applications, is to convert microcrystalline cellulose into nanocrystalline cellulose. Nanocrystalline cellulose can be obtained by several methods, one of them by acid hydrolysis. Hydrolysis of cellulose by using sulfuric acid produces nanocrystalline cellulose. Nanocrystalline cellulose can be characterized by using TEM and PSA analysis. CNC 60 has a particle size distribution with a diameter range of 14.3 nm - 45.0 nm and an average diameter of 17.4 nm. Whereas cellulose with CNC 90 has a smaller particle size distribution with a diameter range of 10.0 nm - 17.1 nm and an average diameter of 11.9 nm.
ABSTRAKKetersediaan air bersih menjadi sangat penting terutama di masa pandemi seperti saat ini. Indikator air bersih tidak hanya dilihat dari warna, tetapi juga dari aroma dan rasa. Untuk memperoleh air bersih salah satunya dapat menggunakan alat filtrasi air dengan karbon aktif sebagai salah satu media filtrasinya. Karbon aktif dapat menyerap zat-zat atau mineral yang mencemari air. Adapun manfaat karbon aktif dalam proses filtrasi air sebagai penyerap bau, warna, klorin atau mineral lain dan membuat rasa segar pada air. Selain menggunakan karbon aktif sebagai media filtrasinya, pada alat filtrasi air juga menggunakan media yang lain untuk membantu menghilangkan kontaminan pada air yang tercemar seperti menggunakan kerikil, ijuk dan pasir. Selain itu juga alat filtrasi dapat didesain dengan sangat baik sehingga aliran air tetap mengalir dengan cepat serta dilengkapi dengan adanya sinar UV untuk membunuh kuman atau bakteri pada air sehingga menjadi lebih steril. Adapun tujuan dari pengabdian ini adalah memberikan edukasi terhadap siswa/i SMK PGRI Cikampek dalam memanfaatkan karbon aktif sebagai salah satu media filtrasi air dalam multi-media water filter. Selain memberikan pelatihan pembuatan dan penggunaan alat filtrasi air, juga disampaikan cara pembersihan dan perawatan alat tersebut serta mengedukasi pentingnya air bersih dalam kehidupan terutama di masa pandemi covid-19 seperti saat ini. Kata kunci: covid-19; karbon aktif; multi-media water filter. ABSTRACTThe availability of clean water is very important, especially during a pandemic like today. The indicator of clean water is not only seen from color, but also by smell and taste. To obtain clean water, one of them can use a water filtration device with activated carbon as one of the filtration media. Activated carbon can absorb substances or minerals that pollute water. As for the benefits of activated carbon in the water filtration process as an absorber of odors, color, chlorine or other minerals and makes the water taste fresh. Apart from using activated carbon as the filtration media, the water filtration device also uses other media to help remove contaminants in polluted water such as using gravel, palm fiber and sand. In addition, the filtration device can be designed very well so that the water flow continues to flow quickly and is equipped with UV rays to kill germs or bacteria in the water so that it becomes more sterile. The purpose of this programme is to provide education to students of SMK PGRI Cikampek in utilizing activated carbon as one of the water filtration media in a multi-media water filter. In addition to providing training on the manufacture and use of water filtration devices, it was also conveyed how to clean and maintain these devices and educate the importance of clean water in life, especially during the Covid-19 pandemic like today. Keywords: covid-19; activated carbon; multi-media water filters.
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