Fotokatalis TiO2 terdoping Fe3+ telah disintesis menggunakan titanium tetraisopropoksida (TTIP) sebagai prekursor serta dopan Fe3+ dari Fe(NO3)3 dengan metode sol-gel. Fotokatalis TiO2 didoping menggunakan Fe3+ bertujuan untuk memperlebar serapan dari sinar Ultra Violet (UV) hingga sinar tampak pada berbagai variasi persentase Fe3+ 0,05%; 0,125%; 0,25% (b/v). karakterisasi fotokatalis dilakukan dengan metode spektrofotometri UV-Vis/DRS, FT-IR, XRD dan diuji aktivitasnya terhadap degradasi rhodamin B. Hasil pengukuran UV-Vis/DRS dari setiap variasi memberikan energi celah pita (Eg) masing-masing sebesar 1,33 eV, 2,11 eV, 2,53 eV. Spektra Infra merah (FT-IR) menunjukkan serapan Fe-O yang merupakan interaksi antara TiO2 dengan dopan Fe3+ dalam struktur TiO2. Hasil pengukuran x-ray difraction (XRD) Fe-TiO2 memberikan difragtogram pada 2θ 25,4773°, 37,9223°, 48,0159° mengindikasikan bahwa Fe3+ telah tersubsitusi kedalam struktur TiO2. Dopan Fe3+ yang telah tersubsitusi juga dapat dibuktikan dari penurunan ukuran rata-rata kristalit dan jarak antar kisi. Hasil Uji Aktivitas konsentrasi dopan Fe3+ 0,125% memiliki aktivitas tertinggi yaitu sebesar 25,605%. Hasil penelitian tersebut menunjukkan bahwa Fe-TiO2 memiliki potensi dalam mendegradasi rhodamin B menggunakan sinar tampak.
The production and characterization of bagasse biochar (Saccharum officinarum Linn) in this study was carried out through pyrolysis for 4 hours at a temperature of 1100C. The purpose of this research was to determine the biochar capacity of bagasse (Saccharum officinarum Linn) as an ameliorant for improving fertility in marginal lands, especially in West Kalimantan, namely peatlands. The capacity of biochar as an ameliorant in this study is known based on gravimetric analysis, which has a moisture content of 0.38%, ash content of 2.42%, volatile content of 0.53%, fixed carbon (cf) 97.02%. Meanwhile, from the results of SEM-EDX characterization there were 100% carbon compounds and the presence of pores in the form of micro pores. And the results of FTIR characterization have the absorption of functional groups of organic compounds at wave numbers (cm-1) 3448.72 from the Ogroup OH streching, 2978.09 and 2931.80 CH bending groups of cellulose compounds, 2368.59 and 2276 C≡C bending groups lingnin compounds and 1620.21 and 1435.04 groups of C=O and C=C streching compounds of lingninsellulose and hemicellulose
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