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Dwityaningsih, Rosita
Lambung Mangkurat University
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Pengaruh Waktu Karbonisasi Terhadap Kadar Air dan Abu Serta Kemampuan Adsorpsi Arang Tempurung Nipah Teraktivasi Asam Klorida Purwanti Sri Rahayu, Theresia Evila; Dwityaningsih, Rosita; Ulikaryani
Infotekmesin Vol 13 No 1 (2022): Infotekmesin: Januari, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i1.1027

Abstract

The Cilacap region, Central Java, Indonesia is a coastal area that is overgrown with nipa palm trees, making it one of the potential local natural resources to be exploited. Utilization of this plant has been carried out for the fields of food, energy, clothing, pharmaceuticals, and furniture, but as an anode material for lithium-ion batteries is still being researched. Studies on lithium-ion batteries in Indonesia in particular have not started long ago so that research in this field is still limited and few in number, but the development of lithium-ion batteries has become one of the national research priorities in the field of new and renewable energy sources as stated in the Indonesian national research master plan (RIRN) for the period 2017 – 2045. This study was conducted to examine the potential feasibility of activated charcoal from nipah shells as anode material for lithium-ion batteries. The feasibility test parameters studied in this study include water content, ash content and adsorption capacity stated as iodine and methylene blue number which are the basic characterizations for activated charcoal referring to SNI 06-3730-1995. The nipah shell carbonization process was carried out in the presence of oxygen at an optimized temperature of 210 oC with a 1 hour time interval variation from 3 to 8 hours, followed by an activation process using a strong acid, namely HCl with a concentration of 2 M. The experimental results showed the average value of moisture content, ash content, iodine, and methylene blue number are 12.5%, respectively; 1.75%; 2515.9161 mg/g; and 97%, all of which are above the quality standard values, so the conclusion from this study is that activated charcoal from nipah shell has basic characteristics that have the potential to be further developed, including as raw material for lithium-ion battery anodes.
Pengaruh Variasi Konsentrasi H3PO4 Sebagai Zat Aktivator Terhadap Karakteristik Karbon Aktif dari Sekam Padi Dwityaningsih, Rosita; Rahayu, Theresia Evila Purwanti Sri; Handayani, Murni; Nurhilal, Mohammad
Infotekmesin Vol 14 No 1 (2023): Infotekmesin: Januari, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i1.1641

Abstract

Rice husk is an organic material that has a high lignocellulosic content so it has the potential to be turned into activated carbon. One method of making activated carbon is activation with a phosphoric acid activator (H3PO4). The purpose of this research was to study the effect of varying concentrations of H3PO4 as an activator on the characteristics of rice husk-activated carbon. The characterization refers to SNI 06-3730-1995 regarding the technical quality requirements of activated charcoal. Activation of rice husk carbon was carried out by contacting the carbon with H3PO4 for 24 hours and shaking it. The H3PO4 consisted of 3 concentration variations, namely 4M, 6M, and 8M. From the research results, the water content was 3.936%; 4.037%; 4.070%, the absorption of iodine has met the character of activated charcoal according to SNI, namely 1217.204 mg/g; 1204.255 mg/g; 1184.832 mg/g while the ash content value does not meet the SNI standard, which is still above 10%. The highest adsorption capacity and adsorption efficiency could be activated with 8M H3PO4, namely 22.42 mg/g and 89.68%. IR spectra on activated carbon with three variations of H3PO4 concentration showed the presence of aromatic C-H, C=C, and C-O anhydride functional groups.
Analisis Porositas, Tekstur, dan Morfologi Karbon Tempurung Nipah Hasil Pirolisis Suhu Tinggi Untuk Anoda Baterai Sekunder Rahayu, Theresia Evila Purwanti Sri; Nurhilal, Mohammad; Dwityaningsih, Rosita
Infotekmesin Vol 14 No 1 (2023): Infotekmesin: Januari, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i1.1666

Abstract

Lithium-ion batteries are the recent main store of electrochemical energy that have been widely used for electronic equipment, electric vehicles, and also renewable energy storage such as wind and solar. Lithium-ion batteries have many electrochemical advantages but lithium availability in nature is reduced very quickly and its distribution is uneven throughout the world. Sodium is attractive as an alternative to lithium insertion for secondary batteries because of its abundant availability and oxidation reduction potential to standard hydrogen electrodes only 0.3 volts higher than lithium. This study aims to synthesize hard carbon from nipah shell biomass using thermal methods of low-temperature pyrolysis (lower than 200 oC) followed by high-temperature pyrolysis (higher than 1000 oC). Characterization is carried out by iodine number analysis to determine porosity and SEM-EDX to determine texture and morphology. The result of the analysis of carbon iodine number is 346.86 mg/g while SEM-EDX analysis showed that carbon has a structure similar to a combination of graphene and nano-tube carbon.
Pengaruh Penambahan Arang Tempurung Kelapa Terhadap Kualitas Briket dari Arang Pelepah Nipah Menggunakan Tepung Tapioka Sebagai Perekat Arifin, Mohamad; Dwityaningsih, Rosita; Ratri Harjanto, Taufan
Infotekmesin Vol 14 No 2 (2023): Infotekmesin: Juli, 2023
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v14i2.1938

Abstract

Nipa Palm fronds is one of the biomass that has potential to be used as briquettes because it has high cellulose. The calorific value of nypa palm frond will cause low briquettes quality. The aims of this study is to determine the effect of the addition of coconut shell charcoal. The research method used was by mixing coconut shell charcoal with nipa palm charcoal with various compositions and using tapioca flour as an adhesive as much as 10% of the total weight of briquettes. It was found that the addition of coconut shell charcoal can improve the quality of briquettes according to SNI No.1/6235/2000 with the best composition ratio palm charcoal:coconut shell charcoal which is 20%:80%. Briquettes have a moisture content 2,43%, ash content 7,3%, a calorific value 6779,64 Kal/gram, density 1 gram/cm2 and a burning rate of 0,0393 gram/minute.
Karakterisasi Material Karbon Aktif Dari Pelepah Nipah (Nypa Fruticans) Dengan Metode Aktivasi Kimia Dwityaningsih, Rosita; Fadlilah, Ilma; Pramita, Ayu
Infotekmesin Vol 15 No 2 (2024): Infotekmesin, Juli 2024
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v15i2.2332

Abstract

Nypa Palm fronds has a high lignocellulose, so it has potential to be used as activated carbon. In this research, activated carbon will be made from Nypa palm fronds using H3PO4 as activator and heated at high temperature. The aim of this research is to know about characterisation of activated carbon from Nypa palm fronds with H3PO4. Activated carbon from Nypa palm fronds was made by 2 M H3PO4 and the carbon powder siz was 80 mesh. It was found that activated carbon from nipa palm fronds has characteristic that are in accordance with technical activated carbon requiremet of SNI 06-3730-1995. It has water content of 3%, ash content of 7,25%, iodine absorbance 1129.41 milligrams per gram, methylene blue absorbance 123.99 milligrams per gram and contains the functional groups C=C and P-O-P. Additional pores can be seen on the surface of the activated carbon when compared to carbon without activation.
Pengaruh Komposisi Bahan Baku dan Kadar Perekat Tepung Tapioka Terhadap Kualitas Briket dari Campuran Daun Ketapang dan Tempurung Kelapa Hunsa, Hanan Izdihar Rashif; Dwityaningsih, Rosita; Fadlilah, Ilma; Shadiq, Zhilal; Ningrum, Sari Sekar
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2483

Abstract

Ketapang leaves are an example of biomass that can be used to make briquettes. However, ketapang leaves produce a low calorific value, so they require additional ingredients to increase the calorific value, one of which is coconut shell. This research aims to evaluate how variations in raw material composition and adhesive content of tapioca flour affect the quality of briquettes on the parameters of calorific value, water content, ash content, volatile substances, fixed carbon content, and density. The method applied in this research involved mixing ketapang leaf charcoal and coconut shell charcoal, then adding adhesive in the form of tapioca flour. The study results showed that all the briquettes tested met SNI 8966-2021 standards except for the density parameter. The conclusion of this study is that the greater the composition of the briquette raw materials and the lower the adhesive content of tapioca flour, the better the quality of the briquettes. The mixed briquettes that produce the best quality are composed of 20% Ketapang leaf charcoal and 80% coconut shell charcoal. The tapioca flour adhesive that delivers the best quality briquettes is at a percentage of 5%.
Pendampingan Pembuatan Pellet Berbahan Baku Limbah Ikan Rucah pada Program TJSL PT. Pertamina Patra Niaga ITC Haryanto, Christi Adi; Efendi, Yusuf; Lestari, Sugiana Putri; Gunawan, Ari; Pamungkas, Fajar; Prasadi, Oto; Iktiagung, Ganjar Ndaru; Dwityaningsih, Rosita
Society : Jurnal Pengabdian Masyarakat Vol. 3 No. 5 (2024): September
Publisher : Edumedia Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55824/jpm.v3i5.446

Abstract

Program PEPES SEGA K-CAP (Pemberdayaan Ekonomi Pesisir Segara Anakan Kutawaru-Cilacap) merupakan upaya dalam peningkatan ekonomi masyarakat nelayan Sembir-Kutawaru, dan mengurangi eksploitasi berlebihan terhadap ekosistem laut serta upaya dalam menjaga kelestarian ekosistem di kawasan Segara Anakan. Pemberdayaan kelompok nelayan merupakan hal yang cukup penting di Kabupaten Cilacap karena sebagian besar masyarakatnya berprofesi sebagai nelayan harian lepas.  Kelompok Nelayan Sembir Sebagian besar juga memiliki tambak serta unggas sehingga membutuhkan pakan ikan serta unggas dengan jumlah yang besar, dengan adanya masalah limbah rucah atau ikan kecil yang cukup banyak di Kelurahan Kutawaru dan dimanfaatkan oleh kelompok sebagai olahan pakan ikan dan unggas dengan nilai gizi yang lebih besar dengan pengolahan yang lebih mudah. Adanya kegiatan pengolahan ikan rucah juga bekerja sama dengan Dinas Perikanan dalam pengelolannya sehingga mendapatkan hasil yang lebih maksimal dengan kualitas baik. Metode dalam pelaksanaan kegiatan ini menggunakan pendekatan partisipatif, penyuluhan secara perorangan dan kelompok dengan metode ceramah, forum group discussion (FGD), demonstrasi cara dan demontrasi hasil. Adapun kegiatan yang dilakukan, khususnya pada kegiatan pembuatan pellet berbahan baku ikan rucah dengan memodifikasi mesin pelet yang sebelumnya menggunakan bahan bakar bensin dikonversi menjadi gas elpiji. Kegiatan ini dilaksanakan di Dusun Sembir yang berada di Kelurahan Kutawaru Kecamatan Cilacap Tengah Kabupaten Cilacap
ADSORPSI FREE FATTY ACID PADA ZEOLIT ALAM TERAKTIVASI NaOH Shadiq, Zhilal; Dwityaningsih, Rosita; Fadlilah, Ilma
Media Bina Ilmiah Vol. 19 No. 7: Februari 2025
Publisher : LPSDI Bina Patria

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33758/mbi.v19i7.1114

Abstract

Salah satu hasil alam Indonesia yang memiliki nilai produksi dan ekspor yang besar adalah kelapa sawit dengan hasil olahannya berupa minyak sawit mentah (CPO) yang mengandung nutrisi makro dan mikro dengan nilai yang cukup tinggi, sehingga banyak digunakan dalam industri farmasi dan pangan. Keberadaan komponen-komponen yang tidak diinginkan seperti asam lemak bebas (FFA) dapat menyebabkan ketengikan dan menimbulkan aroma yang tidak menyenangkan, sehingga mengakibatkan turunnya kualitas dari CPO tersebut. Oleh karena itu dibutuhkan metode yang cukup efektif dan bernilai ekonomis untuk menurunkan kadar FFA pada CPO demi menjaga dan meningkatkan kualitasnya. Salah satu metode yang dapat diterapkan adalah dengan cara adsorpsi menggunakan zeolit alam teraktivasi NaOH sebagai adsorben. Tujuan dari penelitian ini adalah mempelajari pengaruh dari ukuran zeolit alam teraktivasi dan suhu proses adsorpsi terhadap nilai removal FFA dari CPO. Adsorpsi dilakukan secara batch dengan menggunakan adsorben zeolit seberat 25% (b/b) campuran. Zeolit yang digunakan berukuran 150 µm dan 200 µm, dan proses adsorpsi dilakukan pada variasi suhu 25 ℃, 50 ℃, dan 70 ℃. Kemampuan zeolit dalam mengadsorp FFA ditentukan dengan menguji nilai FFA yang tersisa dalam CPO. Hasil penelitian menunjukkan bahwa kemampuan adsorpsi FFA oleh zeolit meningkat dengan semakin kecilnya ukuran zeolit dan semakin tingginya suhu pada proses adsorpsi, sehingga nilai removal FFA tertinggi diperoleh dari adsorpsi menggunakan zeolit alam teraktivasi berukuran 150 µm pada suhu 70 ℃ yaitu 57,8%. Kata Kunci: Adsorpsi, Aktiviasi, Asam Lemak Bebas, NaOH, Zeolit Alam
Co-Authors Anis Aziza Zumroturrida Ari Gunawan DODI SATRIAWAN Efendi, Yusuf Elis Rosida Evila Purwanti Sri Rahayu, Theresia Fadlilah, Ilma Haryanto, Christi Adi Hunsa, Hanan Izdihar Rashif Iktiagung, Ganjar Ndaru Lestari, Sugiana Putri Mardiyana Mardiyana Ma’ruf, Nazula Azzam Mohamad Arifin Mohammad Nurhilal Murni Handayani Murni Handayani Ningrum, Sari Sekar Oto Prasadi Pamungkas, Fajar Pramita, Ayu Prasadi, Oto Purwanti Sri Rahayu , Theresia Evila Radhi Ariawan Rahayu, Theresia Evila P.S. Ratri Harjanto, Taufan Shadiq, Zhilal Syarafina, Sumayya Theresia Sri Rahayu Triwardhani, Aline Bella Triwuri, Nurlinda Ayu Ulikaryani