This paper discuss research about the optical properties and photo catalytic activity of TiO2 film on graphite substrate and its modification with ZnS. The optical properties investigated are the light response at various light wavelength and the gap energy (Eg). Meanwhile, the photocatalytic activity was studied from isopropanol degradation to determine the Quantum Yield (QY) and kinetics of reaction. The results show that the TiO2 layer is consisted of rutile and anatase phases. Meanwhile, the ZnS peaks are at 2θ 27.91 o and 54.58 o . The gap energy of TiO2/G consist of two band gap representing the band gap of rutile and anatase. The ZnS deposition shifted the band gap into single gap of 3.40 eV which is in between the gap energy of single TiO2 and single ZnS. The isopropanol degradation with TiO2/G photocatalyst under visible light radiation did not produce any new peaks representing product. Meanwhile, the photocatalytic process under 380 nm light produce new peaks representing the electronic transition of acetone. The isopropanol degradation with ZnS-TiO2/Graphite produced new peaks that indicates the photocataytic activity of ZnS-TiO2/Graphite whether under UV or visible light radiation. Significant role of ZnS also proven by the increase of the QY values and the increase of rate constant, k.

<p>A composite of γ-alumina and activated carbon made of cassava peels was studied in terms of its pore structures and its properties. The objective of this study was to determine the interaction and structure, as well as the character and pore size of γ-alumina – activated carbon composite.</p><p>Carbon made of cassava peels was activated by H₂SO₄ and its activities were tested according to the Indonesian Industrial Standards (SII). The addition of activated carbon into γ-alumina made in variations of 10, 20, 30, 40 and 50 % w/w, of the total weight of 10 grams. The composite of γ-alumina - activated carbon was characterized by FTIR, SAA (Surface Area Analyzer), XRD, and determination of Hysteresis Loop composites.</p>The greater addition of activated carbon to γ-alumina causes intermolecular interactions between –O-H groups form rehydrated hydrogen bonds in the composite is greater. The structure of γ-alumina in the composites remain intact although the percentage of activated carbon in composite is large. The total pore volume and surface area using the BET method of the composite decreases with increasing activated carbon percentage. The greater addition of activated carbon to γ-alumina causes size of mesoporous composites decreased with the characteristic of a composite formed is closer to the activated carbon.

Kajian terkait Reyog Ponorogo ini dilakukan di Kabupaten Ponorogo Provinsi Jawa Timur. Permasalahan kajiannya ini bertolak dari pertanyaan bagaimana fungsi Reyog Ponorogo bagi penari, wiyogo, penyenggak, dan masyarakat. Tujuan kajian ini dengan berpijak atas pertanyaan itu karena kajian ini bertujuan ingin mengetahui fungsi kesenian Reyog Ponorogo bagi masyarakat. Untuk mengetahui semua itu dilakukan penelitian dengan melakukan observasi, wawancara, dan studi pustaka. Observasi dan wawancara dilakukan di daerah Sawoo, Kauman, dan sekitar makam Bethoro Katong. Informasi awal itu sebagai modal untuk melakukan penelusuran dan penelitian. Hasil penelusuran tersebut dituangkan dalam laporan penelitian ini. Hasil penelitian menunjukkan bahwa kesenian Reyog Ponorogo mempunyai fungsi primer dan sekunder serta mempunyai fungsi sosial dan ekonomi bagi masyarakat. Walaupun demikian fungsi sosial lebih menonjol karena kesenian tersebut sebagai pemersatu dan solidaritas antara penari, wiyogo, penyenggak, pemain lain, dan masyarakat.

Marsetya YR, Mudjijono, Hastuti S. 2009. Antioxidant activity, phenolic and flavonoid contents of snake gourd (Trichosanthes anguina) extract. Biofarmasi 7: 77-86. This research was carried out to evaluate the antioxidant activity and the relationship between antioxidant activity with phenolic and flavonoid contents in snake gourd extract. The extract was prepared by a maceration using methanol, and then continued by an extraction using solvent with increasing polarity. Extract obtained was analyzed to determine the antioxidant activity, and they were compared to the synthetic antioxidant, BHT (Butylated Hidroxytoluene) and PG (Propyl Gallate). The antioxidant activity was determined using the modification of β-carotene-linoleic acid emulsion system. Phenolic content was measured by Folin-Ciocalteu method and the flavonoid content was determined using AlCl3 reagent. The result of this research showed that the antioxidant activity of methanol extract (29.566%) was higher than BHT (16.268%), and it was not significantly different from PG (29.452%). Chloroform extract had the highest antioxidant activity (36.384%), followed by water, hexane, butanol, and ethyl acetate extract, respectively. Phenolic contents of each extract (methanol, chloroform, ethyl acetate, butanol, and water) were 1.904, 3.547, 2.553, 3.114, and 1.776 g GAE (Gallic Acid Equivalent)/100 g extract, and the flavonoid contents were 4.072, 4.162, 1.751, 2.944, and 1.392 g QE (Quercetin Equivalent)/100 g extract, respectively. A positive relationship was found in this research, the chloroform extract that had the highest antioxidant activity contained the highest amount of phenolic and flavonoid. This study showed that snake gourd could be used as a source of natural antioxidant.

ABSTRAKTelah dilakukan studi mengenai struktur dan karakter pori dalam suatu komposit yang dibuat dari γ-alumina dan karbon aktif dari kulit singkong. Penelitian ini bertujuan untuk mengetahui interaksi dan struktur, serta karakter dan tipe ukuran pori dalam komposit γ-alumina -karbon aktif dari kulit singkong.Karbon yang telah dibuat dari kulit singkong diaktivasi dengan H 2 SO 4 dan diuji kualitas aktivitasnya berdasarkan Standar Industri Indonesia (SII). Penambahan karbon aktif ke dalam γ-alumina dibuat dalam variasi 10, 20, 30, 40 dan 50% b/b, dari berat total 10 gram. Komposit γ-alumina -karbon aktif dikarakterisasi menggunakan FTIR, XRD, SAA (Surface Area Analyzer) dan penentuan Hysteresis Loop komposit.Semakin besar penambahan karbon aktif terhadap γ-alumina menyebabkan interaksi intermolekuler antara gugus-gugus -O-H membentuk ikatan hidrogen rehidratasi dalam komposit semakin besar. Struktur γ-alumina dalam komposit tetap terjaga meskipun persentase kadar karbon aktif besar. Penambahan karbon aktif dalam γ-alumina mengakibatkan tipe mesopori komposit menurun dengan karakteristik komposit mendekati karakteristik karbon aktif.