One-pot synthesis of CdS/CeO2 heterojunction nanocomposite with tunable bandgap for the enhanced advanced oxidation process

Abstract

Herein, a binary nanocomposite CdS/CeO2 has been fabricated via a one-pot co-precipitation method for the degradation of Rose Bengal (RB) dye. The structure, surface morphology, composition, and surface area of the prepared composite were characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, Brunaur–Emmett–Teller analysis UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The prepared CdS/CeO2(1:1) nanocomposite has a particle size of 8.9 ± 0.3 nm and a surface area of 51.30 m2/g. All the tests indicated the agglomeration of CdS nanoparticles over the surface of CeO2. The prepared composite showed excellent photocatalytic activity in the presence of hydrogen peroxide under solar irradiation towards the degradation of Rose Bengal. Near to about complete degradation of 190 ppm of RB dye could be achieved within 60 min under optimum conditions. The enhanced photocatalytic activity was attributed to the delayed charge recombination rate and a lower bandgap of the photocatalyst. The degradation process was found to follow pseudo-first-order kinetics with a rate constant of 0.05824 min−1. The prepared sample showed excellent stability and reusability and maintained about 87% of the photocatalytic efficiency till the fifth cycle. A plausible mechanism for the degradation of the dye is also presented based on the scavenger experiments.

Adsorption of Congo Red by chitosan porous beads reinforced with epoxy resin

“…DMF has good solubility for polymers to a certain extent and can diffuse into the interior of epoxy polymers and cause swelling, leading to depolymerization and dissolution of epoxy oligomers. 36,37 The results showed that the CERBs have a good reusability for the removal of CR.…”

Biosynthesis of JC-La2CoO4 magnetic nanoparticles explored in catalytic and SMMs properties

“…In the present study increased the catalyst dosage from 0.025, 0.05, 0.1, and 0.2 g/20 mL, the degradation percentage of MB dye initially increased which may be attributed to the active ROS sites generation. But in higher dosage of catalyst 0.2 g degradation percentage of MB dye decrease, and it could be due to the decrease in photon penetration on the catalyst surface block in solution which leads to a decrease the formation of ROS 60 .

Figure 10 ( a ) Change in the concentration of MB dye in different catalytic dosage in presence of JC-La 2 CoO 4 .

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“…The rate of degradation in presence of IPA and AA rate is highest, therefore the ˙OH, and O 2 - species play a key role for the degradation 60 , 64 , 65 .…”

Nanocosmos of catalysis: a voyage through synthesis, properties, and enhanced photocatalytic degradation in nickel sulfide nanocomposites

“…Metal sulfates, especially those based on cadmium sulfide, are highly appreciated for their suitable energy band alignment and low band gap (∼2.4 eV), which makes them useful for photodegradation reactions. 54 Unfortunately, low solar energy use and the quick recombination of photogenerated electron–hole pairs limit the efficiency of cadmium sulfide. The addition of more metals to create solid solutions is thought to be a workable solution to this problem.…”