Hasil Pencarian  ::  Simpan CSV :: Kembali

"Kebutuhan air bersih meningkat seiring dengan bertambahnya populasi penduduk, namun kebutuhan air bersih tercemar karena kontaminasi limbah cair salah satunya akibat zat warna, proses degradasi zat warna sangat perlu dilakukan dalam upaya reduksi pencemaran air, Salah satu metode yang dapat dilakukan adalah fotodegradasi. Pada penelitian ini dilakukan fotodegradasi zat warna Methylene Blue melalui proses fotokatalitik dengan nanokatalis heterostruktur Au-TiO2. Sintesis TiO2 Nanosheet yang melalui metode Hidrotermal, didapatkan nilai celah pita sekitar 3.38 eV untuk struktur Anatase dengan panjang rata-rata 28 nm dan ketebalan 3.05 nm. Au Nanorod disintesis melalui metode Seeds Mediated Growth dengan variasi penambahan AgNO3 menghasilkan profil fenomena resonansi permukaan plasmon (SPR) yang berbeda dengan serapan paling tinggi pada 800 nm dan aspect ratio yang meningkat dari 3.7-4.5. Integrasi dilakukan dengan metode Ligand Exchange dan pengaturan pH. Laju kinetika tertinggi dari hasil fotodegradasi dicapai oleh Au-TiO2 yang diintegrasi melalui metode Ligand Exchange sebesar 0.1029 min-1.......Demand of clean water increase along with an increase in population, but the presence of organic dyes has become one of the reasons of water contaminant and becoming an environmental problem, the treatment of dye removal nowadays is become very necessary to reduce water pollution. The most efficient and reliable method to degraded organic dyes is using photodegradation method. In this research, we report the result of Methylene Blue photodegradation through the photocatalytic process using Au-TiO2 heterostructured nanocatalysts. TiO2 nanosheets was synthesized through hydrothermal method, the band gap value is 3.38 eV for Anatase structures with an average length of 28 nm and thickness of 3.05 nm. Gold nanorods was synthesized through Seeds Mediated Growth method with variations in the addition of AgNO3. Show a different profile of the Surface Plasmon Resonance (SPR) phenomenon with the highest absorption at 800 nm and an increased aspect ratio from 3.7-4.5. Integration of Au-TiO2 was done by the Ligand Exchange Method and pH control. The high kinetic rate was achieved from Au-TiO2 nanocatalyst done by the Ligand Exchange Method with 0.1029 min-1."

"Penelitian mengenai kualitas Sungai Pesanggrahan telah dilakukan di sembilan stasiun pengamatan di sepanjang sungai. Penelitian ini bertujuan untuk mengetahui kualitas sungai dengan menggunakan makroozoobentos sebagai objek yang diteliti dan Biological Monitoring Working Party -- Average Score Per Taxon (BMWP -- ASPT) sebagai metode yang dipakai. Identifikasi sampel dilakukan di Laboratorium Ekologi, Jurusan Biologi, FMIPA, Universitas Indonesia. Dari hasil penelitian didapatkan 13 Famili makrozoobentos antara lain Hydropsycidae, Libellulidae, Aeshnidae, Lestidae, Chironomidae, Palaemonidae, Potamoidea, Viviparidae, Ampullaridae, Thiaridae, Corbiculidae, Tubificidae, Hirudinae, dan Glossiphoniidae. Nilai (Average Score Per Taxon) ASPT berkisar antara 1--4,75. Berdasarkan nilai ASPT terlihat bahwa Sungai Pesanggrahan dari Hulu (Bogor, Jawa Barat) sampai Hilir (Kembangan, DKI Jakarta) telah mengalami pencemaran tingkat sedang sampai berat, dengan ditandai adanya pencemaran organik dan anorganik yang tinggi. ......Research on the quality of the Pesanggrahan River has been performed in nine observation stations along the river. This study aims to determine the quality of the river using makroozoobentos as the object and Biological Monitoring Working Party -- Average score per taxon (BMWP -- ASPT) method. Identification of samples was conducted in Laboratory of Ecology, Department of Biology, Faculty of Mathematics and Natural Sciences, University of Indonesia. There are 13 Families of makrozoobentos: Hydropsycidae, Libellulidae, Aeshnidae, Lestidae, Chironomidae, Palaemonidae, Potamoidea, Viviparidae, Ampullaridae, Thiaridae, Corbiculidae, Tubificidae, Hirudinae, and Glossiphoniidae. Value of ASPT (Average Score Per Taxon) ranged from 1--4.75. Based on the value of ASPT, the Pesanggrahan River from Upstream (Bogor, West Java) to Downstream (Kembangan, DKI Jakarta) has been experienced moderate to high level of pollution with indication of high organic and inorganic pollution."