Nanotubes mendapat perhatian yang sangat besar karena memiliki luas permukaan yang tinggi. Pada penelitian ini telah difabrikasi nanotubes TiO 2 melalui teknik hidrotermal dari sintesis nanopartikel TiO 2 dengan metode sol-gel. Katalis yang sudah disintesis kemudian di karakterisasi dengan X-Ray Diffraction (XRD) untuk menentukan ukuran kristal dan kristalinitas. Ukuran kristal nanopartikel TiO 2 pada suhu kalsinasi 450 C adalah 13,78 nm. Kemudian dikarakterisasi dengan Transmission Electron Microscopy (TEM) untuk melihat terbentuknya nanotubes. Karakterisasi nanotubes TiO 2 dengan TEM terlihat bahwa struktur tubes sudah mulai terbentuk walaupun pertumbuhan TNTs belum sempurna. Hal ini dapat dilihat dari struktur TNTs yang cenderung pendek dan belum begitu beraturan.
SINTESIS DAN KARAKTERISTIK TiO2 DAN SiO2 SERTA APLIKASINYA TERHADAP KADAR Fe DALAM AIR SUMURABSTRAK Air merupakan kebutuhan yang terpenting dalam kehidupan manusia. Air berperan banyak dalam berbagai kegiatan manusia oleh karena itu kandungan yang ada di air harus bermanfaat bagi manusia. Banyak kandungan yang terdapat di air yang sangat bermanfaat, tetapi bayak juga kandungan air yang mungkin tidak bermanfaat bahkan bahaya jika digunakan oleh manusia, salah satunya yaitu kandungan logam berat terutama Fe (besi). Sehingga tujuan pada penelitian ini untuk mengetahui penurunan kadar Fe (besi) dalam air sumur yang di lakukan dengan fotokimia dengan TiO2 dan SiO2 serta dapat mengidentifikasi karakteristik dari TiO2 dan SiO2. Sampel yang digunakan yaitu air sumur 300 m dibagi menjadi tiga masing-masing 100 ml dengan perlakuan yang berbeda. Pada sampel 100 ml pertama tidak diberikan perlakuan dan juga penambahan. Sampel 100 ml kedua diperlakukan dengan penambahan SiO2 dan pengadukan selama 1 jam, dan untuk sampel 100 ml ketiga diperlakukan dengan penambahan TiO2 dan pengadukan selama 1 jam. Ketiga sampel dengan perlakuan yang berbeda tersebut di analisis dengan menggunakan AAS (Atomic Absorption Spectroscopy) di Laboratorium Kimia Universitas Negeri Semarang. Hasil penelitian Analisis menggunakan AAS (Atomic Absorption Spectroscopy) menunjukkan hasil kadar Fe meningkat pada saat penambahan SiO2 dan TiO2 terhadap sampel yang tidak mendapatkan perlakuan tambahan. kadar Fe pada sampel yang tanpa penambahan sebanyak 0,206 mg/L, kemudian kadar Fe pada sampel yang ditambahkan SiO2 sebenyak 0,225 mg/L, dan kadar Fe pada sampel dengan penambahan TiO2 sebanyak 0,214 mg/L. Hal ini dikarenakan bentuk TiO2 dan SiO2 berupa suspensi. Kelemahan sistem suspensi ini adalah pemisahan partikel TiO2 memerlukan waktu yang lama dan biaya yang sangat mahal,serta daya tembus sinar sinar UV yang terbatas karena absorbsi yang kuat oleh TiO2 (efek bayangan) dan spesies organik terlarut. Kata Kunci: air sumur, TiO2, SiO2, Logam besi (Fe).  SYNTHESIS AND CHARACTERISATION OF TiO2 AND SiO2 APPLICATION TOWARD LEVELS OF Fe IN THE WELL WATER ABSTRACTWater is the most important need in human life. Also, water has many contributions in many human activities. Therefore, the existing content in the water must be beneficial for human. However, material contained in water may be beneficial yet dangerous for human as well, for instance heavy metals content, especially Fe (iron). The main objective of this study is to determine decreasing levels of Fe (iron) in the well water that is done by photochemical reaction using TiO2 and SiO2, and identify the characteristics of TiO2 and SiO2. Samples of well water used is 300 ml divided into three part, and every part of 100 ml water will be given different treatment. First 100 mL sample is not given any treatment and addition. Second 100 mL samples treated with the addition of SiO2 and stirring for an hour, and the third sample of 100 mL is treated with the addition of TiO2 and stirring for an hour. All of three samples with different treatments are analyzed using AAS (Atomic Absorption Spectroscopy) in the Chemistry Laboratory Semarang State University. The research result of analysis using AAS (Atomic Absorption Spectroscopy) shows Fe content increased as the addition of SiO2 and TiO2 in the samples than the sample without any additional treatment. Fe content in the sample without addition is 0.206 mg/L, while Fe content in the sample with addition of SiO2 is 0.225 mg/L, and Fe content in the sample with the addition of TiO2 is 0.214 mg/L. This caused by the form of TiO2 and SiO2 is a suspension. The weakness of this suspension system is the TiO2 particle separation takes a long time, very expensive, and also limited UV rays penetrating power because of the strong absorption by TiO2 (shadow effect) and may dissolved organic species. Keywords: well water, TiO2, SiO2, metals iron (Fe).
The purpose of this research is to study the effect of the amount of aniline on their photocatalytic activity. Nano TiO 2 was synthesized using sol-gel method with TiPP precursor. XRD value of 0.998 3 . Synthesis of composite TNTs/PANI (polyaniline) was done by in situ polymerization technique of aniline which was already contained nano TiO 2 . The molar ratio of aniline and APS in the synthesis of a composite is 1:1.5 with the addition of aniline of 15 %; 20 % and 25 % (w/w %). Characterization using FTIR showed the stretching vibration of the C=N in wavelength of 1 600 cm −1 to mark the formation of quinonoid compounds of polyaniline. The test of the rhodamine B degradation gave the best results on the 25 % TNTs/PANI composite, with the degradation percentage of 58.73 %. The characterization results using dr-uv proved that the decrease of energy gap in the TNTs/PANI composite which as evidenced with Kubelka-Munk calculation equation that was 25 % TNTs/PANI amounting to 3.19 eV and TNTs at 3.24 eV.
Nanotubes received great attention because it has a high surface area. In this study, TiO2 nanotubes fabricated via hydrothermal method from synthesis of TiO2 nanoparticles via sol-gel method. Catalysts that have been synthesized later in the characterization by X-Ray Diffraction (XRD) to obtain the crystal size and crystallinity. Crystal size of TiO2 nanoparticles at a temperature of 450C is 13.78 nm. Then characterized by Transmission Electron Microscopy (TEM) to look at the formation of nanotubes. Characterization of TiO2 nanotubes with TEM shows that the structure of the tubes had already been formed TNTs although the growth has not been perfect. It can be seen from the structure TNTs who tend to be short and yet so irregular.DOI: http://dx.doi.org/10.15408/jkv.v0i0.5036
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