Photocatalytic degradation of organic dye and tetracycline by ternary Ag2O/AgBr–CeO2 photocatalyst under visible-light irradiation

Abstract

In this work, CeO2 nanosheets decorated with Ag2O and AgBr are successfully fabricated via a simple sediment-precipitation method. The as-prepared ternary Ag2O/AgBr–CeO2 composite with double Z-scheme construction was analyzed by various analytical techniques. Ag nanoparticles (NPs) used as the electron medium could reduce the recombination of photoelectrons and holes, thus leading to the improvement of photocatalytic performance of these catalysts. Due to the unique structure and composite advantages, the optimal Ag2O/AgBr–CeO2 photocatalysts exhibit the superior tetracycline (TC) degradation efficiency of 93.23% and favorable stability with near-initial capacity under visible light irradiation. This ternary Z-scheme structure materials will be the well-promising photocatalysts or the purification of antibiotic wastewater.

Structural, Optical and Photocatalytic Activity of Multi-heterojunction Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

“…The recyclability and reusability of photocatalysts are important factors in practical applications [ 75 , 76 ]. The stability of the photocatalytic activity of a photocatalyst can be evaluated through the monitoring of photocatalytic degradation of MeO under light over several cycles.…”

“…Figure 7a illustrates the C/C 0 plot versus irradiation time and, as obviously seen, Bi 2 O 3 /Bi 2 O 2 CO 3 / (BiO) 4 CO 3 (OH) 2 shows a highly efficient degradation rate. Figure 7b shows the degradation reaction kinetics, (1) The recyclability and reusability of photocatalysts are important factors in practical applications [75,76]. The stability of the photocatalytic activity of a photocatalyst can be evaluated through the monitoring of photocatalytic degradation of MeO under light over several cycles.…”

Bio‐fabricated green silver nano‐architecture for degradation of methylene blue water contaminant: A mini‐review

“…During the photodegradation of dyes, four active radical species play a pivotal role, as shown in Figure 6 and Equation . These active species include a photogenerated hole (h + ), hydroxyl radicals (OH − ), superoxide anion radical (O 2 − ), and an electron (e − ) (Hsu, 2019; Li et al, 2021; Ruíz‐baltazar, 2020; Su et al, 2021). As illustrated in Figure 6, the active species trapping measurement is important for examining the active species in the photocatalytic process and gaining a better knowledge of the photocatalytic mechanism.…”

“…In general, biogenic entities immediately exposed active sites, and photogenerated holes and electrons can react with surface hydroxyl groups, adsorbed water, or O 2 to generate O 2•– and • OH. The O 2•– and • OH radicals are highly reactive and quickly oxidize organic compounds on the Ag NPs' surface (Ruíz‐baltazar, 2020; Su et al, 2021). Specifically, as described in Equation below, Ag NPs absorb photons when irritated by sunlight or UV light and then produce an electron–hole pair that react with oxygen and water to create the superoxide radical anion and hydroxyl radical (Dhawal & Kakodkar, 2020; Kanniah et al, 2020; Rajendran et al, 2018).…”

Phosphoric acid surface modified Moringa oleifera leaves biochar for the sequestration of methyl orange from aqueous solution: Characterizations, isotherm, and kinetics analysis

“…In recent years, several techniques e.g., chemical (Kumar et al, 2012), electrochemical (Araújo et al, 2014; Droguett et al, 2020; Suhan et al, 2020), biological (Bhatia et al, 2017; Sahoo et al, 2022), adsorption (El‐Kammah et al, 2022; Wong et al, 2020; Yagub et al, 2014), ozonation (Kasiri et al, 2013; Sheydaei et al, 2020), persulfate oxidation (Shuchi et al, 2021), solar/UV photocatalytic processes (Al‐Mamun et al, 2019; Al‐Mamun et al, 2021; Kader et al, 2022; Su et al, 2021) and nano‐based photocatalytic degradation (Akter et al, 2022; Kader et al, 2022; Rashid Al‐Mamun et al, 2022; Znad et al, 2018) have been applied for the treatment of textile wastewaters. Among these processes, the adsorption technique has been shown as one of the most efficient methods for treating wastewaters due to its low cost, availability, easy operation, and energy efficiency (Busetty, 2019; De Gisi et al, 2016).…”