ABSTRAKTelah dilakukan penelitian tentang sintesis komposit film kitosan-TiO 2 menggunakan sorbitol sebagai plasticizer. Penelitian ini bertujuan untuk mengembangkan penggunaan bahan plastik yang aman bagi kesehatan dan lingkungan karena menggunakan kitosan yang biodegradabel serta TiO 2 yang tidak beracun. TiO 2 juga mampu menahan sinar UV sehingga dapat menjaga kualitas produk terhadap kerusakan akibat sinar UV. Metode penelitian dilakukan dengan sintesis TiO 2 nanokristal fasa anatase dalam matriks kitosan pada temparatur kamar dan proses aging. Larutan selanjutnya ditambahkan sorbitol dan diaduk selama 24 jam untuk menghasilkan larutan homogen. Komposit film dibentuk dengan membuat lapisan (coating) pada plat kemudian dikeringkan membentuk komposit film. Hasil karakterisasi menggunakan XRD, TEM dan FTIR menunjukkan bahwa telah terbentuk TiO 2 nanokristal fasa anatase yang terdispersi pada matriks kitosan dengan membentuk ikatan hidrogen dalam komposit film. Pada sifat fisika (physical properties) teramati bahwa penggunaan sorbitol sebagai plasticizer telah meningkatkan sifat plastis, kuat tarik (tengsile strenght) dan elongasi komposit film, tetapi pada penggunaan sorbitol yang semakin besar, sifat elastis, kuat tarik dan elongasi menjadi turun. Sifat plastis yang cukup baik dari komposit film didapatkan pada penambahan sorbitol 3 %.Kata Kunci: elongasi, kitosan-TiO 2, komposit film, kuat tarik, sorbitol. ABSTRACTThe synthesis of chitosan-TiO 2 film composite using sorbitol as plasticizer has been conducted. This research aims to develop environmental friendly plastic material which is safe for health due to the use of biodegradable chitosan -TiO 2 that can block UV rays and therefore, maintain the quality of product from damage caused by UV rays. The anatase phase TiO 2 nanocrystal was synthesized in chitosan matrix at room temperature and aging process. The solution was then added and blended in sorbitol for 24 hours to obtain homogeneous solution. The composite film was formed by coating method on a
Polymerization of purified eugenol from clove leaf oil using concentrated sulfuric acid as catalyst has been done in this research. Clove leaf oil was purified by vacuum redistillation, acid-base extraction, and vacuum fractionation to yield eugenol. The eugenol was polymerized with concentrated sulfuric acid in ratio 1: 2. Polyeugenol from eugenol of clove leaf oil resulted from redistillation, extraction, and fractionation is in solid form (yield: 88.14%); from redistillation and extraction is also in solid form (yield: 86.15%); from redistillation clove leaf oil is in gel form (yield: 100.29%). Structure of polyeugenol was determined by infrared spectrophotometer and characterized by thin layer chromatography (TLC). Molecular weight of the product was calculated by viscometry method.DOI: http://dx.doi.org/10.15408/jkv.v0i0.4685
Dye-sensitized solar cells (DSSCs) was fabricated using natural dyes extracted from krokot (Portulaca Oleracea. L). The effect of dye acidity was investigated on natural pH extract, 5.00, 4.00 and 3.00 of pH. The efficiency and stability DSSCs as a function of the dye acidity was studied. The result of the UV-Vis shows that the absorption of wave-length from dye extract of krokot is located in the visible region with the absorbance peak in 410.5 nm and 664.5 nm which are the peak of chlorophyll. The efficiency of extract krokot dye sensitized solar cells was decreasing 6.88 x 10-3 % to 0.42 x 10-3 % when pH of the dye was adjusted from 6.27 to 3.00. DSSCs stability was also decreased look for efficiency loss from 5.27% to 97.49% in the same conditions.
Persaingan antara pelaku usaha yang semakin ketat akibat interaksi global menuntut setiap UKM (Usaha Kecil Menengah) sektor pangan harus lebih kreatif dan cermat dalam memasarkan produk mereka. Salah satu yang menjadi isu penting dalam persaingan global produk UKM sektor pangan adalah kenyamanan konsumen, khususnya konsumen muslim yang menuntut kehalalan suatu produk pangan. Oleh karena itu, pemerintah dan pihak terkait harus aktif memberikan penyuluhan terkait dengan sertifikat halal suatu produk. Jurusan Kimia UIN Sunan Kalijaga sebagai lembaga pendidikan tinggi yang core studinya fokus pada integrasi-interkoneksi sains-keislaman mewujudkan perannya dalam bentuk kegiatan penyuluhan proses sertifikasi halal hasil penyembelihan Rumah Potong Ayam (RPA) yang disampaikan kepada UKM anggota kelompok ternak unggas “Mitra Harapan Turi” di Dusun Garongan Wonokerto Turi Sleman Yogyakarta. Kegiatan ini merupakan langkah awal yang diikuti dengan kegiatan pendampingan, pembinaan, dan pengawasan bagi kelompok UKM tersebut guna meningkatkan pendapatan mereka. Materi penyuluhan meliputi manfaat dan proses sertifikasi halal suatu produk, khususnya produk RPA, serta materi mengenai teknik penyembelihan ayam potong yang sehat dan halal sesuai dengan syariat Islam. Peserta memperoleh pengetahuan baru dan motivasi dalam mengembangkan UKM mereka. Jika produk mereka dilengkapi dengan sertifikat halal, maka wilayah pemasaran produk mereka dapat diperluas hingga ke hotel dan rumah makan. Ini sangat memungkinkan karena Yogyakarta merupakan kota wisata yang memiliki banyak hotel dan rumah makan. Sebanyak 7 RPA bersedia mengurus sertifikat halal untuk produk mereka pada gelombang pertama bulan Maret 2015, sementara RPA yang lain menyusul pada gelombang kedua. Mereka didampingi oleh Jurusan Kimia UIN Sunan Kalijaga hingga memperoleh sertifikat tersebut dari LPPOM-MUI. Selanjutnya, Jurusan Kimia UIN Sunan Kalijaga bersama dengan LPPOM-MUI D.I. Yogyakarta akan melakukan pengawasan dalam pelaksanaan jaminan halal masing-masing RPA yang telah memiliki sertifikat halal.
The effect of increasing surface area of graphite electrode on the performance of dual chamber Microbial Fuel Cells (MFC) was observed. The surface area of graphite electrode (anode and cathode) that was using in this experiment was 29.5cm2 and 44.5cm2 for the A and B reactor, respectively. The anode chamber contained mixed microorganism culture from real wastewater of textile industry and the cathode chamber contained 0.1M potassium permanganate electrolyte solution. The salt bridge was required to stabilize the charge between the anode and cathode chambers, and the electrodes attached to the anode and cathode chambers as the electron catcher. Both, the A and B reactor were observed for 72 hours of running time. The voltage and power density were found to increase with the increase in surface area of the graphite electrode. The highest power density was 93.93mWm-2 and 197.23mWm-2 that obtained at 36 hours and 48 hours on the A and B reactor, respectively. At the end of experiment, these MFCs system could also reduce COD by 28.6% and 15.6% on A and B reactor, respectively.
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