Studi Penggunaan TiO2/NiSe/N/C untuk Fotoreduksi Cr(VI)

Zain, Elfirza (2023) Studi Penggunaan TiO2/NiSe/N/C untuk Fotoreduksi Cr(VI). Other thesis, Institut Teknologi Sepuluh Nopember.

Text 0121194000016-Undergraduate_Thesis.pdf.pdf - Accepted Version Restricted to Repository staff only until 1 September 2025. Download (4MB) | Request a copy

Abstract

Kromium adalah polutan beracun yang biasanya berasal dari industri seperti electroplating, metalurgi, tekstil, penyamakan, dan pemrosesan logam. Ion Cr(VI) bersifat sangat toksik, karsinogenik, dan mutagenik. Proses reduksi secara fotokatalitik dianggap sebagai salah satu metode yang paling menjanjikan dalam mengatasi masalah ini. TiO2 dipilih sebagai fotokatalis karena aktivitas fotokatalitik yang sangat tinggi, sifat kimia yang menguntungkan, stabilitas yang tinggi, dan harga yang relatif terjangkau. Namun, TiO2 memiliki kelemahan berupa celah pita yang lebar. Pada riset ini telah disintesis TiO2/NiSe yang dimodifikasi dengan N/C melalui metode solvothermal sebagai fotokatalis dengan variasi TiO2 berupa rutile (Rk) dan P25 (Pk). Fotokatalis yang dihasilkan dioptimalisasi untuk reduksi logam berat kromium di dalam air secara fotokatalitik. Material hasil sintesis juga di karakterisasi dengan X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), UV-Diffuse Reflectance (UV-DRS) dan Fourier Transform Infrared (FTIR) Spectroscopy. Hasil karakterisasi UV-Vis DRS menunjukkan adanya penurunan celah pita dengan penambahan material karbon dan nitrogen. Nilai celah pita terendah diperoleh 2,87 eV pada sampel Rk. Dilakukan pula studi fotoreduksi TiO2/NiSe/NC di dalam air terhadap Cr(VI) dengan beberapa variasi, yaitu pencahayaan (tanpa cahaya, lampu TL, lampu 365 nm, lampu 254 nm) dan hole scavenger (asam format). Hasil studi fotoreduksi terbaik diperoleh oleh sampel Pk pada variasi lampu 254 dan 365 nm dengan menggunakan hole scavenger asam format dengan persen fotoreduksi mencapai 99,7%.
==================================================================================================================================
Chromium is a toxic pollutant that usually comes from industries such as electroplating, metallurgy, textiles, tanning, and metal processing. Cr(VI) ions are highly toxic, carcinogenic, and mutagenic. The photocatalytic reduction process is considered one of the most promising methods for overcoming this problem. TiO2 was chosen as a photocatalyst due to its very high photocatalytic activity, favorable chemical properties, high stability, and relatively affordable price. However, TiO2 has the disadvantage of a wide band gap. In this research, TiO2/NiSe modified with N/C has been synthesized through solvothermal method as a photocatalyst utilizing two forms of TiO2, namely rutile (Rk) and P25 (Pk). The resulting photocatalyst are optimized for photocatalytic reduction of heavy metal chromium in water. The synthesized materials were characterized using X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), UV-Diffuse Reflectance Spectroscopy (UV-DRS), and Fourier Transform Infrared (FTIR) spectroscopy. The UV-Vis DRS characterization results showed a decrease in band gap with the addition of carbon and nitrogen materials. The lowest band gap value was obtained at 2.87 eV in the Rk sample. The photoreduction study of TiO2/NiSe/NC in water against Cr(VI) was also conducted with several variations, namely light source (no light, TL lamp, 365 nm lamp, 254 nm lamp) and hole scavenger (formic acid). The best photoreduction study results were obtained by the Pk sample at 254 nm lamp variations using formic acid hole scavenger with 99,7% percent of photoreduction.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	asam format, Cr(VI), fotoreduksi, hole scavenger, TiO2; formic acid, photoreduction
Subjects:	Q Science > QD Chemistry Q Science > QD Chemistry > QD716 Photocatalysis.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Elfirza Zain
Date Deposited:	18 Sep 2023 05:56
Last Modified:	18 Sep 2023 05:56
URI:	http://repository.its.ac.id/id/eprint/103404

Actions (login required)

View Item