Inserting AgCl@rGO into graphene hydrogel 3D structure: synergy of adsorption and photocatalysis for efficient removal of bisphenol A

Chen, Fangyuan; Zhao, Jin; An, Weijia; Hu, Jinshan; Liang, Yeru; Cui, Wenquan

doi:10.1039/c7ra06126a

Cited by 21 publications

(5 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To the best of our knowledge, there are rare reports on such a high removal efficiency and long-term stability of aerogel-based photocatalysts in a continuous photodegradation system (Figure a, Table ). ,− The better photocatalytic performance of the SGAMs is attributed to the advantages of Ag 3 PO 4 and its association with honeycomb-shaped GO aerogel microspheres. First, numerous ice crystals induce the formation of a honeycomb-like structure with channels radially diverging from the center, which shortens the diffusion pathway of pollutants and allows to achieve rapid adsorption equilibrium; second, the interaction between Ag 3 PO 4 nanoparticles and the GO matrix facilitates fast electron hopping from Ag 3 PO 4 to the GO sheets, which significantly reduces the photocorrosion of Ag 3 PO 4 and enhances the photocatalytic activity of Ag 3 PO 4 (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Silver Phosphate/Graphene Oxide Aerogel Microspheres with Radially Oriented Microchannels for Highly Efficient and Continuous Removal of Pollutants from Wastewaters

Liu

Shi

Song

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Silver phosphate/graphene oxide aerogel microspheres (SGAMs) with radially oriented microchannels are constructed by electrostatically spraying the as-prepared silver phosphate/graphene oxide/chitosan (Ag3PO4/GO/CS) suspension into numerous microdroplets followed by freezing, lyophilization and cross-linking for highly efficient and continuous removal of pollutants from wastewaters. The resultant aerogel microspheres exhibit both high adsorption rate and large adsorption capacity because of their short internal diffusion pathway and high specific surface area. The synergy between adsorption and visible light photocatalysis endows the porous microspheres an outstanding efficiency of removing pollutants under both static and continuous water treatment conditions. Furthermore, the presence of graphene oxide (GO) efficiently improves the recyclability of Ag3PO4 due to the fast electronic transfer at the interface. More than 95% Rhodamine B (50 mg L–1) is adsorbed by SGAMs in 5 min, and bisphenol A (10 mg L–1) is almost completely photodegraded in 20 min under visible light irradiation. The removal efficiency of bisphenol A in a continuous flow system (0.1 mL min–1) is maintained at 95% over 50 h. In addition, the SGAMs could photodegrade pharmaceuticals and pesticides effectively. This work provides a promising visible light photocatalysis approach for enhancing efficiency and durability of photocatalysts in a continuous water treatment system.

show abstract

Section: Resultsmentioning

confidence: 99%

Silver Phosphate/Graphene Oxide Aerogel Microspheres with Radially Oriented Microchannels for Highly Efficient and Continuous Removal of Pollutants from Wastewaters

Liu

Shi

Song

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…On the contrary, photocatalysis breaks down organic contaminants to their nontoxic components with the aid of a semiconductor harvesting solar light Table contains some of the available literature wherein semiconductor composites are employed for water treatment through a adsorption–photocatalysis synergistic approach. − …”

Section: Introductionmentioning

confidence: 99%

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

et al. 2022

View full text Add to dashboard Cite

Adsorption-mediated water treatment leaves adsorbents as secondary pollutants in the environment. However, photocatalysis aids in decomposing the contaminant into its nontoxic forms. In this context, we demonstrate an adsorption−photocatalysis pairing in Au− CeO 2 nanocomposites for a total methylene blue (MB) removal from water. We synthesized Au−CeO 2 through the citrate (cit) reduction method at different Au loading and studied its adsorption capacity with kinetics and thermodynamic models. We observe that the high adsorption capacity of Au−CeO 2 is primarily because of the presence of Ce 3+ states in CeO 2 and citrate ligands on Au NPs. The Ce 3+ states interact and transfer their electrons to supported Au NPs, rendering a negative charge over Au. The negatively charged Au surface and the carboxyl (−COO − ) group of citrate ligands mediate an electrostatic interaction/adsorption of cationic MB. The total removal of MB is expedited under white light and lasers. A control experiment with Au NPs shows less adsorption−photocatalysis. The size of Au NPs and Au−CeO 2 interfacial interaction is responsible for the surface plasmon resonance spectral position at 550−600 nm. Linear sweep voltammetry (LSV) and plasmonic field simulation show surface plasmon-driven photocatalysis in Au−CeO 2 . LSV shows a 3-fold higher photocurrent density in Au− CeO 2 than colloidal Au NPs under white light. The simulated electric field intensity in Au−CeO 2 is maximum at SPR excitation and the closest interfacial separation (d = 0 nm). The plasmon-driven photocatalysis in colloidal Au NPs is mainly due to the interaction of hot electrons with the adsorbed MB molecule. Notably, near-field light concentration, hot electrons, and interfacial charge separation are responsible for excellent MB removal in the Au−CeO 2 nanosystem. The total MB removal through adsorption− photocatalysis pairing is 99.3% (Au−CeO 2 ), 30.7% (Au NPs), and 13% (CeO 2 ).

show abstract

“…Recent studies have shown that AgCl can exhibit better stability by coupling them with graphene. For example, Chen et al had successfully fabricated AgCl@rGO‐rGH by compositing the graphene hydrogels with AgCl via a chemical reduction method, the photocatalytic activity and stability of the AgCl nanoparticles were improved remarkably after the introduction of rGO. Luo et al had fabricated the Ag/AgCl/rGO heterostructured photocatalyst by a mild oxidization reaction of hydrothermally prepared Ag/rGO in FeCl 3 solution, which displayed improved photocatalytic activity and stability than that of bare AgCl.…”

Section: Introductionmentioning

confidence: 99%

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

et al. 2019

View full text Add to dashboard Cite

A novel rGO/AgCl QDs composites have been obtained by an ultrasonic‐assisted method for the first time. Photoelectrocatalytic (PEC) performances of the obtained samples were studied by the degradation of 20 mg/L Tetracycline (TC) under visible light irradiation with an applied bias potential of 1.5 V (vs Ag/AgCl). Degradation of TC by different processes including Photocatalysis (PC), Electrocatalysis (EC), and PEC was compared, and the effect of different bias potential on the PEC degradation of TC was discussed. Results showed that rGO/AgCl QDs composites had displayed superior PEC activity than that of pristine AgCl QDs with degrading 85.2% of TC during 120 minutes, which was about 1.5 times higher than that of AgCl QDs (33%). Besides, compared to PC and EC removal of TC, PEC process showed the highest degradation efficiency of TC (85.2%) by rGO/AgCl QDs, which was about three times and one time higher than that of PC (39.18%) and EC (20.73%) system, respectively. Moreover, the reusibility and stability of the samples were tested by five times cycling tests, and results demonstrated that the stability of bare AgCl QDs was improved after the introduction of rGO. The enhanced PEC activity and stability of the samples could be attributed to the intimate contact between rGO and AgCl QDs and external electric field, which had benefitted the formation of more active sites and accelerated electron‐hole separation.

show abstract

Inserting AgCl@rGO into graphene hydrogel 3D structure: synergy of adsorption and photocatalysis for efficient removal of bisphenol A

Abstract: An AgCl@graphene (rGO) core–shell structure was fabricated and then loaded into reduced graphene oxide hydrogel (rGH) to form AgCl@rGO-rGH by the chemical reduction method.

Cited by 21 publications

References 49 publications

Silver Phosphate/Graphene Oxide Aerogel Microspheres with Radially Oriented Microchannels for Highly Efficient and Continuous Removal of Pollutants from Wastewaters

Silver Phosphate/Graphene Oxide Aerogel Microspheres with Radially Oriented Microchannels for Highly Efficient and Continuous Removal of Pollutants from Wastewaters

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

Contact Info

Product

Resources

About

Inserting AgCl@rGO into graphene hydrogel 3D structure: synergy of adsorption and photocatalysis for efficient removal of bisphenol A

Abstract: An AgCl@graphene (rGO) core–shell structure was fabricated and then loaded into reduced graphene oxide hydrogel (rGH) to form AgCl@rGO-rGH by the chemical reduction method.

Cited by 21 publications

References 49 publications

Silver Phosphate/Graphene Oxide Aerogel Microspheres with Radially Oriented Microchannels for Highly Efficient and Continuous Removal of Pollutants from Wastewaters

Silver Phosphate/Graphene Oxide Aerogel Microspheres with Radially Oriented Microchannels for Highly Efficient and Continuous Removal of Pollutants from Wastewaters

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO2 Nanosystem: Experimental Validation and Plasmonic Modeling

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

Contact Info

Product

Resources

About

Synergy of Adsorption and Plasmonic Photocatalysis in the Au–CeO₂ Nanosystem: Experimental Validation and Plasmonic Modeling