Enhanced ultraviolet-visible photocatalysis of RGO/equaixial geometry TiO2 composites on degradation of organic dyes in water

Abstract

The reduced graphene oxide dopped equaixial geometry TiO 2 (rGO/egTiO 2 ) composite as photocatalyst was synthesized hydrothermally with various mass ratios of tetrabutyl titanate. The photocatalyst is considered to be rGO/equaixial geometry TiO 2 in terms of modifying the combined reduced graphene Oxide and TiO 2 . The rGO plays a vital role in rGO/egTiO 2 composite as photocatalysts were analyzed in methylene blue (MB) and rhodamine B (RhB) photocatalytic degradation under UV and simulated solar light irradiation. This synthesized catalyst was characterized by various analytical techniques such as XPS, XRD, SEM, BET and TEM. The rGO/egTiO 2 composite exhibits enhanced photo-catalytic performance with degradation rate of 97.5 and 97% on RhB and MB for 60 min under UV radiation respectively, while the degradation rate of 94 and 92 % was observed on the same dyes for 6 h under the simulated sunlight radiation. The enhanced photocatalytic performance of the rGO/egTiO 2 composite under ultraviolet irradiation source was owing to a high separation e ciency of the photo-induced electron-hole pairs, while the photocatalytic performance under simulated sunlight radiation was due to the photosensitive and charge separator behavior of rGO. This offers us an excellent potential of signi cant photo catalytic activity for the removal of organic contaminants from wastewater.

Rational optimization of 2D Bi2MoO6 nanopiece@2D g‐C3N4 nanoflake composite for boosting photocatalytic performance of hydrogen evolution rate and organic dye removal

“…Chemical methods include ozonation, Fenton reaction and photocatalytic reaction 3‐5 . Physical methods include membrane separation, ultrasonic methods and adsorption 6 . Biochemical methods include anaerobic and aerobic treatments 7,8 …”

“…Since ultraviolet (UV) light accounts for about 4% of the sunlight, in order to make more effective use of the sunlight there is an urgent need to develop visible light photocatalysts. Up to now, the developed visible‐light photocatalysts can be divided into four types according to their composition and band gap structure: metal/non‐metal‐doped semiconductors with large band gaps; 6,9 metal‐containing semiconductors with narrow band gaps; 10,11 plasma noble metals; 12,13 and recently discovered metal‐free semiconductors 14,15 …”