ABSTRAKPenelitian tentang pembuatan dan uji efektifitas katalis membran selulosa asetat/nata de coco-TiO 2 nano (CA/NDC-TiO 2 nano) pada fotodegradasi zat warna metilen biru dengan sistem batch telah dilakukan. TiO 2 nano disintesis menggunakan metode hidrotermal dengan kalsinasi pada suhu 450 o C. Analisis Scanning Electron Microscopy (SEM) menunjukkan bahwa TiO 2 nano telah berhasil disintesis dengan rata-rata ukuran diameter partikelnya adalah 88,63 4,37 nm. Selain itu, pola difraksi sinar-X (XRD) dari TiO 2 nano masih menunjukkan adanya puncak-puncak TiO 2 dengan fase anatase. Fotokatalis membran CA/NDC-TiO 2 nano dipreparasi melalui metode inversi fasa dengan mencampurkan TiO 2 nano dalam larutan casting CA. Analisis termogravimetri menunjukkan tiga fenomena dekomposisi dari membran CA/NDC-TiO 2 nano selaras dengan fenomena dekomposisi membran CA/NDC. Fotodegradasi metilen biru dilakukan dengan menggunakan fotokatalisator TiO 2 nano dan membran CA/NDC-TiO 2 nano selama 50 menit dengan sistem batch. Perubahan absorbansi larutan metilen biru diukur menggunakan spektrofotometer pada panjang gelombang maksimum 664,6 nm. Hasil yang diperoleh menunjukkan bahwa reaksi fotodegradasi metilen biru cenderung mengikuti reaksi orde 2. Berdasarkan nilai konstanta kecepatan reaksi, k, efektivitas fotokatalis membran CA/NDC-TiO 2 nano dengan TiO 2 nano pada proses fotodegradasi metilen biru secara statistik terhitung tidak berbeda signifikan.Kata kunci: Fotodegradasi, Membran CA/NDC-TiO 2 nano, Metilen biru, Semikonduktor
<p>Study of synthesis and effectiveness of membrane catalyst of cellulose acetate/nata de coco-TiO<sub>2 </sub>nano (CA/NDC-TiO<sub>2</sub> nano) in photodegradation of methylene blue in batch system has been investigated. TiO<sub>2</sub>nanoparticles were synthesized by hydrothermal method followed by calcination at 450<sup>o</sup>C. Scanning Electron Microscopy (SEM) images indicate nano TiO<sub>2</sub> has been successfully synthesized with average particle diameter as 88,63±4,37 nm. X-ray diffraction pattern (XRD) of nano TiO<sub>2</sub> shows some characteristic peaks of anatase TiO<sub>2</sub> were still existed. Membrane photocatalyst of CA/NDC- nano TiO<sub>2</sub> was prepared via phase inversion method by mixing TiO<sub>2</sub> nanoparticles with CA casting solution. Thermogravimetric analysis shows three decomposition steps of CA/NDC-nano membrane as well as CA/NDC membrane. Photodegradation of methylene blue was conducted with nano-TiO<sub>2</sub> particles and CA/NDC-TiO<sub>2</sub> membrane for 50 minutes in batch system. The absorbance changes were measured by spectrophotometer at wavelength of 664.6 nm. The result shows the photodegradation rections tended to follow second order reaction. According to the rate constant value, <em>k</em>, the photocatalytic effectivity using CA-NDC/nano TiO<sub>2</sub> membrane and nano TiO<sub>2</sub>photocatalysts in metilen blue photodegradation, statistically were not significantly different.</p>
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