Photodegradation of bromophenol blue in aqueous medium using graphene nanoplates-supported TiO2

Abstract

The bromophenol blue dye in aqueous medium was photodegraded (under UV irradiation) by graphene nanoplates-supported titanium oxide (TiO 2 /GNP). The determination of various elements (percentage) and morphological study was performed using energy-dispersive X-rays and scanning electron microscopy, while the photodegradation study of dye was done by UV-visible spectrophotometer. The morphological study showed that the TiO 2 particles were dispersed well on the surface of GNP. The sizes of TiO 2 particles were below 500 nm. The photodegradation study was performed as function of time, and it was found that the photodegradation of dye in aqueous medium was increased as the time duration of UV irradiation increased. It was found that about 86% of dye was degraded within 8 h. The degradation of bromophenol blue is pHdependent, and the photodegradation rate was increased as the pH of solution increased. The increase in dye degradation might be due to the formation of more hydroxyl radical at higher pH. The degradation of dye at pH 2, 4, 6 and 8 was about 70, 79, 90 and 95%, respectively.

Photocatalytic activity of layered MoS2 in the reductive degradation of bromophenol blue

“…Shah T. et al 47 in their study examined the photodegradation of BPB dye in an aqueous medium by graphene nanoplates-supported titanium dioxide (TiO 2 /GNP). The photodegradation study was performed as a function of time, and it was found that the photodegradation of dye in an aqueous medium increased as the time duration of UV irradiation increased.…”

“…The degradation processes shown in papers [47][48][49][50] rely on photo-oxidation undergoing upon the UV-irradiation of highlyengineered nanomaterials. While our approach, based on photo-reduction, offers similar effectiveness of deuorination on material absorbing both UV and visible light.…”

Flower-like SnO2 Nanoparticle Biofabrication Using Pometia pinnata Leaf Extract and Study on Its Photocatalytic and Antibacterial Activities

“…In addition, the MS spectra of the initial and treated solutions suggested the predicted reaction intermediates from the presence of m/z = 667.4, 665.7, 632.7, 603.5, 500.3, 523.2, 415.1 and 325.6. The degradation mechanism and products of azo dyes have been extensively discussed, and refer to the existence of the peak m/z = 667.4, which is higher compared to the m/z reflecting the presence of BPB (665.7), indicating the addition of the radical as the first step of the propagation [45,46]. initial and treated solutions suggested the predicted reaction intermediates from the presence of m/z = 667.4, 665.7, 632.7, 603.5, 500.3, 523.2, 415.1 and 325.6.…”

Facile preparation of nanocellulose embedded polypyrrole for dye removal: unary and binary process optimization and seed toxicity

“…used in various applications such as pH indicator, determination of trace quantity of metals, multiple industries such as paper and textile, and biological staining. Exposure to these includes skin and eye irritation; ingestion may lead to damage in the central nervous system and reproductive system; and prolonged exposure may cause liver, kidney and heart damage (Nezamzadeh-Ejhieh and Zabihi-Mobarakeh 2014; Shah et al 2019). Cellulose with general formula (C 6 H 10 O 5 ) n consists of repeating units of glucose monomers twisted to 180° to each other linked by β(1,4) glycosidic linkages.…”