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Robiah Robiah
Program Studi Teknik Kimia, Fakultas Teknik, Universitas Muhammadiyah Palembang Jl. Ahmad Yani 13 Ulu Palembang
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Social Sciences

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Journal : Jurnal Distilasi

 1 
GREEN SYNTHESIS NANOPARTIKEL GRAPHENE DENGAN AGEN PEREDUKSI URIN MANUSIA DAN APLIKASINYA SEBAGAI ADITIF BIONANOLUBRICANT BERBASIS CPO (CRUDE PALM OIL) Irawan, Ahmad; Robiah, Robiah
Jurnal Distilasi Vol 2, No 2 (2017): Jurnal Distilasi
Publisher : Universitas Muhammadiyah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jd.v2i2.1201

Abstract

Graphene is a nanomaterial that has been widely applied to various fields because of the uniqueness of the material, therefore this material is very interesting to be developed as an additive in lubricant. This study aims to determine the optimum additive weight ratio and obtain optimum operating conditions in the graphene dispersion process in base oil. This research is divided into 2 stages: preliminary research and main research. The preliminary study aims to transform the chemical structure of crude palm oil (CPO) through a three-stage reaction into a polyol as a base oil. The main research is the process of making bionanolubricant. Graphene is synthesized using a combination technique with a human urine as reducing agent. The formulations are known by varying the weight of the additive and the time of the dispersion. Variation of additive weight was 0% (A1), 0.25% (B1), 0.5% (C1), 1% (D1) while for dispersion time variation ranged from 0 min (A2), 60 min (B2), 90 minutes (C2) and, 120 minutes (D2). Based on the SEM-EDX test results, the SEM image formed graphene and spectrum layers on EDX show that the oxide in graphene has been successfully reduced. Bionanolubricant was tested for quality with 7 parameters. The composition of base oil formula 250 gr and graphene nanoparticles 0.5% w / w is the optimum additive weight ratio for C1 sample code whereas the economical dispersion time is 60 minutes. The result of the viscosity index test is 121,72, its pour point is 10,4oC, flash point equal to 228oC with lubrication capability tested through four ball tester got scar diameter equal to 0,87 mm. This Bionanolubricant belongs to the SAE 250 class and is classified as a GL-4 lubricant based on the quality level of API (American Petroleum Institute) performance test.
BIOPLASTIK DARI PATI KULIT PISANG RAJA DENGAN BERBAGAI BAHAN PEREKAT Robiah, Robiah -
Jurnal Distilasi Vol 4, No 2 (2019): Jurnal Distilasi
Publisher : Universitas Muhammadiyah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32502/jd.v4i2.2208

Abstract

Kulit pisang raja adalah salah satu limbah yang belum banyak dimanfaatkan oleh masyarakat. Limbah kulit pisang raja memiliki kadar pati yang cukup tinggi sebesar 50% dan dapat diolah sebagai bahan baku bioplastik. Bioplastik merupakan plastik yang dapat terdegdredasi dalam waktu yang lebih cepat dibandingkan dengan plastik konvensional yang sulit terdegredasi sehingga mencemari lingkungan. Bioplastik berbahan baku pati memiliki potensi besar karena di Indonesia terdapat berbagai tanaman penghasil pati. Untuk memperbaiki karakteristik bioplastik maka perlu penambahan bahan perekat dan  plasticizer. Pada penelitian ini bahan perekat yang digunakan adalah ZnO, Kitosan, dan Clay dengan variasi konsentrasi masing – masing 2%, 4%, 6%, 8%, 10% , serta sorbitol sebagai plasticizernya. Penelitian ini dilakukan untuk mengetahui jenis bahan perekat dan konsentrasi terbaik terhadap bioplastik yang dihasilkan.Hasil penelitian menunjukkan bahwa bioplastik dari pati kulit pisang raja yang dihasilkan optimum adalah pada penambahan jenis bahan perekat clay dengan konsentrasi 8%, plasticizer sorbitol 25%. Bioplastik yang dihasilkan  ditinjau dari tingkat degredasi dengan analisa selama 8 hari sebesar 54,4% berat residual, nilai kuat tarik sebesar 115,2 MPa, serta analisa kandungan logam Timbal (Pb) <0,001 ppm dan Kadmium (Cd) 0,103 ppm. Karakteristik bioplastik dari pati kulit pisang raja memenuhi Standar Nasional Indonesia (SNI). Kata Kunci : bioplastik, pati kulit pisang raja, bahan perekat
Co-Authors Ahmad Irawan, Ahmad Ani Melani Eko Ariyanto Eko Ariyanto Ismi Manora Siahaan Kharismadewi, Dian Rifdah, Rifdah Yuyun Niyati Yuyun Niyati