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Characteristics of Cellulose Acetate Composite Membranes (Ca/Cs, Ca/Pva, Ca/Peg) As Cu(Ii) Metal Ion Filtration Membranes Amalia, Vina; Sudiarti, Tety; Mufidah, Rafa; Yuliarti, Yuliarti; Nisrin, Yusrina; Rohmatulloh, Yusuf
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 11, No 1 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i1.34722

Abstract

Industrial development in Indonesia has caused increased pollution, including water pollution by heavy metals, one of which is the metal ion Cu(II). Cellulose acetate composite membranes have been widely used to overcome the problem of Cu(II) metal ion content in water, however, studies on the performance of cellulose acetate membranes with various types of chitosan, polyvinyl alcohol (PVA) and polyethylene glycol (PEG) composites have not been widely reported. This research aims to analyze the characteristics of cellulose acetate composite membranes with chitosan, PEG, and PVA using FTIR and SEM and to determine the performance of these cellulose acetate composite membranes in filtering Cu(II) metal from the resulting rejection values. The membrane was made using the phase inversion method and the composite membrane was made using the dip-coating method. The results of characterization using FTIR showed that there were no new peaks in all cellulose acetate composites, so there were only physical interactions in the composites. SEM analysis shows that the surface of the composite membrane is more irregular and the porosity increases. The performance of the composite membrane in filtering Cu(II) metal is better than the pure cellulose acetate membrane.
Characteristics of Cellulose Acetate Composite Membranes (Ca/Cs, Ca/Pva, Ca/Peg) As Cu(Ii) Metal Ion Filtration Membranes Amalia, Vina; Sudiarti, Tety; Mufidah, Rafa; Yuliarti, Yuliarti; Nisrin, Yusrina; Rohmatulloh, Yusuf
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol. 11 No. 1 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i1.34722

Abstract

Industrial development in Indonesia has caused increased pollution, including water pollution by heavy metals, one of which is the metal ion Cu(II). Cellulose acetate composite membranes have been widely used to overcome the problem of Cu(II) metal ion content in water, however, studies on the performance of cellulose acetate membranes with various types of chitosan, polyvinyl alcohol (PVA) and polyethylene glycol (PEG) composites have not been widely reported. This research aims to analyze the characteristics of cellulose acetate composite membranes with chitosan, PEG, and PVA using FTIR and SEM and to determine the performance of these cellulose acetate composite membranes in filtering Cu(II) metal from the resulting rejection values. The membrane was made using the phase inversion method and the composite membrane was made using the dip-coating method. The results of characterization using FTIR showed that there were no new peaks in all cellulose acetate composites, so there were only physical interactions in the composites. SEM analysis shows that the surface of the composite membrane is more irregular and the porosity increases. The performance of the composite membrane in filtering Cu(II) metal is better than the pure cellulose acetate membrane.
Suruhan (Peperomia pellucida L. Kunth) and Senggani (Melastoma malabathricum L.) Leaves as Natural Antioxidant Food Additive Kurniasih, Nunung; Rohmatulloh, Yusuf; Pratiwi, Citra Dewi; Muttaqi, Putri Imarotul; B Mohamad Taib, Mohamad Nurul Azmi
Elkawnie Vol. 11 No. 2 (2025)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v11i2.26503

Abstract

Abstract: Food additives are components that affect the nature and/or shape of food. One of them is antioxidants added to food products that contain oil to prevent oxidation that causes damage to food ingredients characterized by a rancid aroma. Suruhan (Peperomia pellucida (L. Kunth)) and Senggani (Melastoma malabathricum L.) leaves are used as natural antioxidants to prevent such damage. This study aims to determine the class of compounds in both plant extracts, their antioxidant activity, and the effect of adding these extracts to bulk cooking oil. The extraction of Suruhan and Senggani leaves is carried out using maceration with ethanol. In phytochemical tests, both Senggani and Suruhan leaf extracts showed positive results in containing flavonoids, tannins, phenolics, and saponins. An antioxidant activity test using the DPPH method (2,2-diphenyl-1-picrylhydrazyl) measured absorption at a maximum wavelength of 518 nm and compared it with antioxidant synthesis TBHQ (tert-butyl hydroquinone). The results showed that Suruhan and Senggani leaves had moderate antioxidant activity with IC50 values of 131.5575 and 119.0362 ppm, respectively. The two extracts with the highest inhibitory value of 38.3657% were then applied to bulk cooking oil, which was heated at 60°C and 180°C and compared to the addition of TBHQ to bulk cooking oil. The results showed that the natural antioxidants of Suruhan and Senggani leaf extracts could inhibit damage to bulk cooking oil during the heating process by reducing the peroxide number and free fatty acid levels in bulk cooking oil. Abstrak: Bahan tambahan pangan merupakan komponen yang ditambahkan untuk mempengaruhi sifat dan atau bentuk suatu bahan pangan. Salah satunya adalah antioksidan yang ditambahkan pada produk pangan yang mengandung minyak dengan tujuan mencegah oksidasi penyebab rusaknya bahan pangan yang ditandai dengan aroma tengik. Daun suruhan (Peperomia pellucida (L.) Kunth) dan senggani (Melastoma malabathricum L.) digunakan sebagai antioksidan alami dalam mencegah kerusakan tersebut. Penelitian ini bertujuan untuk mengetahui golongan senyawa yang terkandung dalam kedua ekstrak tanaman, aktivitas antioksidan, dan pengaruh penambahan ekstrak tersebut pada minyak goreng curah. Ekstraksi daun suruhan dan senggani dilakukan dengan metode maserasi menggunakan etanol. Pada uji fitokimia, baik ekstrak daun senggani maupun suruhan menunjukkan hasil positif mengandung flavonoid, tanin, fenolik, dan saponin. Dan hanya daun suruhan yang mengandung steroid. Uji aktivitas antioksidan menggunakan metode DPPH (2,2-diphenyl-1-picrylhydrazil) diukur serapan pada panjang gelombang maksimum 518 nm dan dibandingkan dengan antioksidan sintesis TBHQ (tert-butyl hydroquinon). Hasil penelitian menunjukkan bahwa daun suruhan dan senggani memiliki aktivitas antioksidan yang sedang dengan nilai IC50 berturut-turut sebesar 131,5575 dan 119,0362 ppm. Kedua ekstrak dengan nilai inhibisi tertinggi yaitu 38,3657% selanjutnya diaplikasikan pada minyak goreng curah yang dilakukan pemanasan pada suhu 60°C dan 180°C serta dibandingkan dengan adanya penambahan TBHQ pada minyak goreng curah. Hasil penelitian menunjukkan bahwa antioksidan alami ekstrak daun suruhan dan senggani dapat menghambat kerusakan pada minyak goreng curah selama proses pemanasan berlangsung dengan menurunkan bilangan peroksida dan kadar asam lemak bebas pada minyak goreng curah.