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All Journal Reaktor Jurnal Teknik Kimia USU Jurnal Teknik Kimia USU Jurnal Rekayasa Proses
Amelia, Devita
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Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Pengaruh Konsentrasi Ekstrak Buah Belimbing Wuluh (Averrhoa bilimbi) sebagai Koagulan Alami terhadap Karakteristik Karet Klon PB 260 Achmad, Feerzet; Amelia, Devita; Pratiwi, Ayu; Wahyu Saputri, Laila; Deviany; Yuniarti, Reni; Suhartono; Suharto
Jurnal Teknik Kimia USU Vol. 11 No. 1 (2022): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v11i1.8418

Abstract

Averrhoa bilimbi is a plant rich in benefits, one of which as natural coagulant. The aim of this research is to increase the potential of Averrhoa bilimbi as an environmentally friendly natural coagulant for the coagulation of rubber clone PB 260. The concentrations of Averrhoa bilimbi used were 45%, 55%, 65%, 75% and 85%. The characteristics of the rubber tested were dry rubber content (DRC), initial plasticity (Po) and Plasticity Retention Index (PRI). Based on the results of this study, the optimum concentration of Averrhoa bilimbi is 85% for latex coagulation time of 11 minutes with 33% DRC, 41% Po and 97% PRI. The highest the concentration of Averrhoa bilimbi used, the faster the coagulation process occurred. 2% formic acid was used as a chemical coagulant for comparison. From the results of this study, it can be concluded that Averrhoa bilimbi can be used as a natural coagulant producing rubber characteristics equal in quality as the ones using formic acid as a chemical coagulant and meets Indonesian Rubber Standard SNI 06-1903-2000.
Pengaruh Konsentrasi Ekstrak Buah Belimbing Wuluh (Averrhoa bilimbi) sebagai Koagulan Alami terhadap Karakteristik Karet Klon PB 260 Achmad, Feerzet; Amelia, Devita; Pratiwi, Ayu; Wahyu Saputri, Laila; Deviany; Yuniarti, Reni; Suhartono; Suharto
Jurnal Teknik Kimia USU Vol. 11 No. 1 (2022): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (282.308 KB) | DOI: 10.32734/jtk.v11i1.8418

Abstract

Averrhoa bilimbi is a plant rich in benefits, one of which as natural coagulant. The aim of this research is to increase the potential of Averrhoa bilimbi as an environmentally friendly natural coagulant for the coagulation of rubber clone PB 260. The concentrations of Averrhoa bilimbi used were 45%, 55%, 65%, 75% and 85%. The characteristics of the rubber tested were dry rubber content (DRC), initial plasticity (Po) and Plasticity Retention Index (PRI). Based on the results of this study, the optimum concentration of Averrhoa bilimbi is 85% for latex coagulation time of 11 minutes with 33% DRC, 41% Po and 97% PRI. The highest the concentration of Averrhoa bilimbi used, the faster the coagulation process occurred. 2% formic acid was used as a chemical coagulant for comparison. From the results of this study, it can be concluded that Averrhoa bilimbi can be used as a natural coagulant producing rubber characteristics equal in quality as the ones using formic acid as a chemical coagulant and meets Indonesian Rubber Standard SNI 06-1903-2000.
Pengaruh kombinasi antara fotodegradasi dan H2O2 terhadap karakteristik mikroplastik dari limbah disposable face mask Achmad, Feerzet; Amelia, Devita; Sembiring, Arie Sabdi; Ananda, Novia Putri; Mahardika, Melbi
Jurnal Rekayasa Proses Vol 16 No 2 (2022): Volume 16, Number 2, 2022
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.76141

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh lama iradiasi sinar UV dan penambahan H2O2 terhadap karakteristik mikroplastik limbah disposable face mask (DFM). DFM atau masker sekali pakai terbuat dari bahan polipropilen memiliki sifat hidrofobik yang tinggi sehingga proses degradasi tidak dapat berlangsung secara maksimal. Fotodegradasi UV dan penambahan H2O2 merupakan salah satu metode yang dapat digunakan untuk memodifikasi struktur kimia dari mikroplasatik dengan membentuk gugus fungsi aktif seperti gugus karbonil dan gugus hidroksil. Fotodegradasi sinar UV dilakukan dengan memvariasikan lama waktu iradiasi sinar UV yaitu 24; 36; 48; 60; 72 jam untuk sampel tanpa dan dengan penambahan H2O2 1% v/v. Hasil proses fotodegradasi dikarakterisasi berdasarkan kandungan dari sampel, yaitu perubahan struktur kimia yang dianalisa menggunakan Fourier Transform Infrared (FTIR), perubahan morfologi permukaan mikroplastik dianalisa menggunakan mikroskop binokuler dan persentase penurunan berat mikroplastik dianalisa menggunakan metode gravimetri. Penelitian ini didapatkan hasil terbaik fotodegradasi tanpa H2O2 terjadi pada waktu 36 jam dan hasil terbaik fotodegradasi dengan kombinasi penambahan H2O2 terjadi pada waktu 60 jam berdasarkan penurunan persen transmitansi terbesar gugus karbonil (C=O) yang dianalisis menggunakan FTIR sehingga terjadi penurunan hidrofobisitas pada DFM walaupun tidak siginifikan. Penambahan H2O2 1% v/v tidak memberikan pengaruh signifikan terhadap perubahan karakteristik sampel yang difotodegradasi yang dibuktikan dengan hasil analisis FTIR, perubahan struktur permukaan sampel DFM dan berat yang hilang dari sampel DFM setelah proses fotodegradasi. Berat yang hilang dari sampel setelah proses fotodegradasi sebesar 0,43% tanpa penambahan H2O2 dan 0,29% dengan penambahan H2O2 dengan waktu iradiasi selama 72 jam(α < 1%).
Characterization of Cellulose Extracted from Garlic Waste via Alkaline Treatment and Its Effect on Yield Fahni, Yunita; Atro Auriyani, Wika; Amelia, Devita; Rizki Safitra, Edwin; Riana Saputri, Desi; Damayanti, Damayanti; Sanjaya, Andri; Christian Surya Atmaja, Michael; Nyoman Wiswa Kananda, I; Surya Ningrum, Riska; Mahardika, Melbi
Reaktor Volume 25 No.1 April 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.1.%p

Abstract

Garlic waste—including straws, bulbs, and skins—is an agricultural residue contributing to household waste. Rich in cellulose, garlic waste can be converted into various value-added products through proper processing. In this study, cellulose was extracted from garlic waste using alkaline treatment to investigate the influence of sodium hydroxide (NaOH) concentration on the characteristics of the resulting cellulose. NaOH solutions with varying concentrations of 2%, 7%, 14%, and 20% were used during the alkalization process. FTIR spectra revealed transmittance changes with increasing concentration, indicating a reduction in lignin content. The resulting cellulose exhibited needle-like structures, and garlic fibers with amorphous morphology showed cleaner surfaces at a NaOH concentration of 20%. The highest extract yield from the alkalization process was 62.7%, achieved at a NaOH concentration of 2%. These findings demonstrate the potential of garlic waste as a cellulose source and its applicability for producing derivative products such as thin films, optical fibers, and bioplastic raw materials.
Co-Authors Ananda, Novia Putri Andri Sanjaya Atro Auriyani, Wika Ayu Pratiwi, Ayu Christian Surya Atmaja, Michael Damayanti Damayanti Deviany Fahni, Yunita Feerzet Achmad Mahardika, Melbi Nyoman Wiswa Kananda, I Reni Yuniarti Riana Saputri, Desi Rizki Safitra, Edwin Sembiring, Arie Sabdi SUHARTO Suhartono Surya Ningrum, Riska Wahyu Saputri, Laila