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PENGGUNAAN METODE ULTRASONIKASI DALAM PROSES SINTESIS rGO DARI TEMPURUNG KELAPA NITA APRILIA; DIAH HARI KUSUMAWATI
Inovasi Fisika Indonesia Vol 8 No 1 (2019)
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v8n1.p%p

Abstract

AbstrakProses sintesis rGO berbahan dasar tempurung kelapa dapat dilakukan dalam beberapa metode, salah satunya dengan menggunakan metode ultrasonikasi. Metode ultrasonikasi ini menggunakan variasi pelarut (aquades dan HCl) dan variasi waktu (1 jam, 2 jam dan 3 jam) yang berbeda. Hasil sintesis tersebut akan di karakterisasi menggunakan FTIR dan Spektroskopi Raman. Uji FTIR menggunakan variasi waktu dan pelarut yang berbeda, dimana penggunaan tersebut dapat mengubah struktur dari rGO. Sampel rGO(aquades) pada variasi waktu 1 jam dan 2 jam mengalami pergeseran puncak C=O sehingga untuk variasi waktu 3 jam tidak mengalami pergeseran. Sedangkan sampel rGO(HCl) juga mengalami pergeseran untuk variasi waktu 3 jam, dimana ikatan utama dari rGO tidak muncul dan untuk variasi waktu 1 jam muncul ikatan C-H. Berdasarkan hasil karakterisasi FTIR yang memiliki perbedaan, dimana perbedaan hasil tersebut yang paling baik adalah sampel rGO dengan jenis pelarut HCl pada waktu 2 jam, karena ikatan utama rGO yaitu O-H dan C=O masih tersisa. Selain itu, hasil dari karakterisasi Spektroskopi Raman dengan variasi waktu 2 jam dan jenis pelarutyang berbeda, pada sampel rGO(aquades) memiliki puncak D dan G berturut-turut 1347.10 cm-1, 1589.24 cm-1 dengan nilai rasio ID/IG 2.21 dan sampel rGO(HCl) puncak D dan G berturut-turut 1356.34 cm-1, 1585.34 cm-1 dengan nilai rasioID/IG 2.04, hasil yang memiliki defect lebih sedikit adalah rGO dengan pelarut HCl karena rGO dengan pelarut aquades memiliki defect lebih besar.Berdasarkan hasil Spektroskopi Raman, dimana jenis pelarut HCl pada rGO dapat menurunkan rasio ID/IG yang menandakan bahwa defect dari rGO semakin sedikit.Kata kunci : tempurung kelapa, reduced graphene oxide (rGO), ultrasonikasi.AbstractThe synthesis process of rGO made from coconut shell can be done in several methods, one of them is by using the ultrasonication method.This ultrasound method uses a variety of solvents (distilled water and HCl) and different time variations (1 hour, 2 hours and 3 hours).The synthesis results will be characterized using FTIR and Raman Spectroscopy.FTIR test uses different time and solvent variations, where the use can change the structure of the rGO. Samples of rGO(aquades) at a time variation of 1 hour and 2 hours experienced a shift in peak C=O so that for a variation of time 3 hours did not experience a shift. While the rGO sample (HCl) also shifted for a variation of 3 hours, where the main bond of the rGO did not appear and for a variation of 1 hour a C-H bond appeared. Based on the results of FTIR characterization that have differences, where the difference in results is the best is the sample rGO with the type of HCl solvent at 2 hours, because the main bonds of rGO, OH and C=O are still left. In addition, the results of the characterization of Raman Spectroscopy with variations in time of 2 hours and different types of solvents, in the sample rGO(aquades) have D and G peaks respectively 1347.10 cm-1, 1589.24 cm-1 with a value of ID/IG 2.21 and sample rGO(HCl) D and G peaks respectively 1356.34 cm-1, 1585.34 cm-1 with ratio ID/IG 2.04 values, the results that have fewer defects are rGO with HCl solvents because the rGO with aquades solvent has a greater defect. Based on the results of Raman Spectroscopy, where the type of HCl solvent in the rGO can reduce the ID/IG ratio which indicates that the defect of the rGO is less.Keywords: coconut shell, reduced graphene oxide (rGO), ultrasonication.
Analysis of the Impact of Non-Tariff Measures Policy on Indonesian Frozen Shrimp Export Performance in Main Destination Markets Nita Aprilia; Yusman Syaukat; Faroby Falatehan
Budapest International Research and Critics Institute-Journal (BIRCI-Journal) Vol 6, No 2 (2023): Budapest International Research and Critics Institute May
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v6i2.7653

Abstract

The shrimp commodity greatly contributes to the total export value of the fisheries sub-sector in Indonesia. In 2021 Indonesia was ranked 4th as the world's largest frozen shrimp exporting country. However, the export value of this commodity still fluctuates every year, and there are still various obstacles to the NTM policy. This study aims to analyze the performance of Indonesian frozen shrimp trade in destination markets, the application of NTM policies to trade in Indonesian frozen shrimp commodities in destination markets, and the impact of NTM policies and other factors on Indonesian shrimp exports in destination markets. This study uses an inventory approach and a gravity model. The results of the study show that the performance of Indonesia's frozen shrimp export trade has a positive trend in the 2007-2021 period. The highest growth in Indonesia's frozen shrimp exports occurred in 2014, 29.59 per cent. China has the highest implementation of NTM policies in the form of SPS and TBT, with a total of 69 policies that have an impact on Indonesian shrimp exports. The results of the estimation of the impact of NTM and other influencing factors using the gravity model show that the exchange rate and population positively affect the export volume of Indonesian frozen shrimp. In contrast, the NTM policy imposed by the importing country does not significantly affect the export volume of Indonesian frozen shrimp.
Peran Bank Sentral Dalam Pengendalian Inflasi Dan Stabilitas Sistem Keuangan Rini Puji Astuti; Anugrah Arif Ivandi; Nita Aprilia
Jurnal Akuntansi Keuangan Dan Perpajakan | E-ISSN : 3063-8208 Vol. 1 No. 4 (2025): April - Juni
Publisher : GLOBAL SCIENTS PUBLISHER

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Abstract

This research aims to analyze the role of the central bank in controlling inflation and maintaining the stability of the financial system in Indonesia. Controlled inflation and a stable financial system are two crucial aspects that support sustainable economic growth. As the monetary authority, the central bank is mandated to maintain price stability and financial system stability through monetary and macroprudential policies. The research employs a literature review method with a descriptive qualitative approach. Data were collected through document analysis, central bank annual reports, and related literature. The analysis was conducted by understanding and observing the policies implemented by the central bank in relation to macroeconomic theories and principles of financial system stability. The findings indicate that Bank Indonesia has successfully controlled inflation through the determination of benchmark interest rates and open market operations. Additionally, the implementation of macroprudential policies, such as supervision of capital adequacy ratios and bank liquidity, has strengthened the stability of the financial system
The Efficacy of Murabahah Agreements in Personal Financing Schemes: A Case Study of KSPPS BMT NU in Rural Indonesia Shinta Amelia Putri; Nita Aprilia; Intan Yulianti; Muhammad Fauzinudin Faiz
Al-Kharaj: Journal of Islamic Economic and Business Vol. 7 No. 1 (2025): All articles in this issue include authors from 3 countries of origin (Indonesi
Publisher : LP2M IAIN Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24256/kharaj.v7i1.6330

Abstract

This study aims to analyze the effectiveness of murabahah agreements in personal financing schemes at KSPPS BMT NU, especially at the Wringin Bondowoso branch, Indonesia. This research uses a descriptive qualitative method with a case study approach. Data were collected through in-depth interviews with semi-structured interviews and using purposive techniques in determining respondents, direct observation, and documentation related to the procedures and implementation of the murabahah agreements. The results showed that KSPPS BMT NU Wringin Branch has successfully implemented the murabahah agreements in accordance with sharia principles. The transparent financing process and clear profit margin are the main factors in increasing customer trust. In addition, this murabaha contract contributes to increasing access to financing for the Wringin village community. The results of this study provide important insights into the application of murabahah agreements in Islamic microfinance institutions and their impact on the economic development of the ummah. This study recommends the need for further development in Islamic financing practices as well as suggestions for future research that can explore other aspects of the murabahah contract and its impact on community welfare