Study of the Potential of La/Bi2S3 Catalyst for Photodegradation of Acid Yellow 42 Dye under Visible Light

Abstract

The new catalyst (La/Bi2S3) applies for the photodegradation of Acid Yellow 42 (AY42) dye under visible light in this study. The La/Bi2S3 material is the motivating catalyst due to the excellent ability of Lanthanum (La) to increase the adsorption capacity and electron-hole separation of Bi2S3 for enhancing the degradation of AY42. The characterization analysis of the prepared material confirms a successful synthesis using the hydrothermal method. The efficiency of photodegradation AY42 using La/Bi2S3 is higher than pure Bi2S3. La on Bi2S3 (doped at 3%), which is devised on adsorption (40.24%) and photodegradation (51.86%), has the best degradation efficiency (92.1%). The trapping experiment and the analysis of electron spin resonance (ESR) spectra explain that the hydroxyl radical is the most active species in this photocatalytic process due to the total degradation efficiency decreasing from 92.1% to 57.16% by the scavenger using isopropyl alcohol (IPA). The hole (h+) shows its importance in the photodegradation of AY42 by detecting that OH- is the intermediate species. The new material (La/Bi2S3) also shows excellent photostability in the reusability test. Finally, the result confirms that La is a suitable doping metal for Bi2S3 and is interesting for practical application under visible light. The new catalyst (La/Bi2S3) applies for the photodegradation of Acid Yellow 42 (AY42) dye under visible light in this study. The La/Bi2S3 material is the motivating catalyst due to the excellent ability of Lanthanum (La) to increase the adsorption capacity and electron-hole separation of Bi2S3 for enhancing the degradation of AY42. The characterization analysis of the prepared material confirms a successful synthesis using the hydrothermal method. The photodegradation efficiency of AY42 using La/Bi2S3is higher than pure Bi2S3. The doping of 3% weight of La on Bi2S3 shows the optimum degradation efficiency of 92.1%, devised on adsorption (40.24%) and photodegradation (51.86%). The pure Bi2S3 (46.7%) contains 17.1% of adsorption and 29.6% of photodegradation. The trapping experiment and the analysis of electron spin resonance (ESR) spectra explain that the hydroxyl radical is the most active species in this photocatalytic process due to the total degradation efficiency decreasing from 92.1% to 57.16% by the scavenger using isopropyl alcohol (IPA). The hole (h+) shows its importance in the photodegradation of AY42 by detecting that OH- is the intermediate species. The new material (La/Bi2S3) also shows excellent photostability in the reusability test. Finally, the result confirms that La is a suitable doping metal for Bi2S3 and is interesting for practical application under visible light.