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All Journal POSITRON Jurnal Kimia Riset
Bashofi, Syilfia Ainur Rohmah
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Chemistry Energy Physics

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Degradasi Rhodamin B oleh Bi4Ti3O12 yang Diperoleh dari Metode Lelehan Garam Campuran NaCl/KCl Bashofi, Syilfia Ainur Rohmah; Prasetyo, Anton
POSITRON Vol 13, No 2 (2023): Vol. 13 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v13i2.69085

Abstract

Rhodamin B adalah salah satu limbah zat warna yang berbahaya bagi ekosistem sehingga diperlukan usaha-usaha untuk menanganinya. Salah satu metode yang berpotensi digunakan dalam menangani limbah rhodamin B adalah metode fotokatalis. Salah satu senyawa yang mempunyai kemampuan aktivitas fotokatalis yang baik adalah senyawa Bi4Ti3O12 dengan partikel bermorfologi plate-like/sheets. Salah satu metode sintesis yang dapat menghasilkan Bi4Ti3O12 bermorfologi plate-like/sheets adalah metode lelehan garam. Dalam penelitian ini telah disintesis Bi4Ti3O12 dengan metode lelehan garam campuran KCl/NaCl dan selanjutnya dilakukan uji degradasi rhodamin B. Difraktogram senyawa produk menunjukkan bahwa senyawa target Bi4Ti3O12 telah berhasi disintesis akan tetapi masih ditemukan sedikit pengotor berupa TiO2 (rutil). Mikrograf menunjukkan bahwa senyawa produk mempunyai morfologi plate-like/sheets, dengan ukuran partikel pada rentang 2-6 μm. Hasil perhitungan spektrum reflektan dengan menggunakan persamaan Kubelka-Munk menunjukkan bahwa energi celah pita Bi4Ti3O12 adalah 2,88 eV. Hasil uji kemampuan degradasi menunjukkan bahwa rhodamin B mengalami penurunan konsentrasi pada rentang 39,84% sampai 50,61% dalam waktu 60 menit.
Molten Salt Synthesis of Sr2Bi4Ti5O18 for Rhodamine B Removal via Adsorption-Photocatalysis Effect Prasetyo, Anton; Bashofi, Syilfia Ainur Rohmah; Safitri, Widiya Nur; Hardian, Arie
Jurnal Kimia Riset Vol. 10 No. 2 (2025): December
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkimris.v10i2.71283

Abstract

The textile industry's rapid growth has increased dye waste; therefore, effective treatment solutions are needed. Photocatalysis technology has emerged as a promising approach due to its efficiency and environmentally friendly properties. Aurivillius-structured compounds have shown potential as photocatalysts because their ferroelectric properties can inhibit recombinant rate electron-hole. In this research, we synthesized Sr₂Bi₄Ti₅O₁₈ (one of the five-layer Aurivillius compound classes) using the molten salt method. Then, we tested its application for adsorption-photocatalysis degradation of rhodamine B. The diffractogram showed that the Sr2Bi4Ti5O18 phase was successfully synthesized with minor impurities (Bi2O3 and TiO2) attributed to incomplete reaction processes. The SEM image showed plate-like particles with non-uniform particle sizes was obtained. The Kubelka-Munk result showed that the band gap energy of Sr2Bi4Ti5O18 is 3.27 eV. Adsorption tests demonstrated that Sr2Bi4Ti5O18 reduced rhodamine B concentration by 52.5% for 30 minutes, which corresponds to its good adsorption capability. Further adsorption-photocatalysis experiments under light exposure showed ~60% reduction in rhodamine B concentration for 60 minutes. The comparison between adsorption and photocatalysis results suggests that adsorption dominates in decreasing rhodamine B concentration. This is likely due to the large number of rhodamine B molecules adsorbed on the surface of Sr2Bi4Ti5O18, which prevents light from reaching the Sr2Bi4Ti5O18 surface, thereby hindering the degradation of rhodamine B through the photocatalysis mechanism.
Co-Authors Anton Prasetyo Arie Hardian RR. Ella Evrita Hestiandari Safitri, Widiya Nur