Electronic Theses and Dissertation

Anodisasi kasa stainless steel 304L berhasil dilakukan dan menghasilkan lapisan oksida nanopori pada permukaan kasa stainless steel di dalam elektrolit etilen glikol, hidrogen peroksida dan variasi berat amonium fluorida (NH4F) 0,1; 0,3; 0,37; dan 0,7 g. Variasi berat amonium fluorida dilakukan untuk melihat pengaruhnya terhadap aktivitas fotokatalitik. Lapisan oksida yang dihasilkan dari proses anodisasi adalah α-Fe2O3, Fe3O4, dan FeOOH, dengan puncak kristalinitas tertinggi α-Fe2O3. Sampel kasa stainless steel hasil variasi 0,1 g; 0,3 g; 0,37 g; dan 0,7 g NH4F masing-masing menghasilkan diameter pori sebesar 54,93 nm, 69,26 nm, 76,14 nm, dan 83, 99 nm. Karakterisasi yang dilakukan pada kasa stainless steel menggunakan instrument Scanning Electron Microscopy (SEM), Spektroskopi raman, dan Spektrofotometer (UV-Vis). Perbedaan morfologi dan puncak kristalinitas pada keempat sampel kasa stainless steel dapat mempengaruhi aktivitas fotokatalitiknya pada reaksi fotoreduksi kromium heksavalen (Cr(VI)) menjadi kromium trivalen (Cr(III)). Hasil persentase rata-rata reduksi Cr(VI) paling tinggi pada keempat variasi sampel kasa stainless steel yaitu sampel kasa stainless steel 0,1 g NH4F 48,79%.

Anodization of 304L stainless steel mesh was successfully carried out, producing a nanoporous oxide layer on the surface of the stainless steel mesh in an electrolyte of ethylene glycol, hydrogen peroxide, and varying amounts of ammonium fluoride (NH4F) at 0.1, 0.3, 0.37, and 0.7 g. The ammonium fluoride concentration was varied to investigate its effect on photocatalytic activity. The oxide layer produced by the anodization process consists of α-Fe2O3, Fe3O4, and FeOOH, with the highest crystallinity peak observed for α-Fe2O3. The stainless steel mesh samples resulting from the variations of 0.1 g, 0.3 g, 0.37, and 0.7 g NH4F produced pore diameters of 54.93 nm, 69.26 nm, 76.14 nm, and 83.99 nm, respectively. Characterization of stainless steel mesh was performed using Scanning Electron Microscopy (SEM), Raman Spectroscopy, and Spectroscopy (UV-Vis). Differences in morphology and crystallinity peaks among the four stainless steel steel mesh samples can influence their photocatalytic activity in the photoreduction reaction of hexavalent chromium (Cr(VI)) become trivalent chromium (Cr(III)). The highest average reduction percentage of Cr(VI) was observed in the stainless steel mesh sample treated with 0.1 g of NH4F 48.79%.