Hierarchical Ag-ZnO Microspheres
with Enhanced Photocatalytic Degradation
Activities

Wu, Huayi; Jian, Wen-Jie; Dang, Haifeng; Zhao, Xiufeng; Zhang, Lizhong; Li, Jianhui

doi:10.15244/pjoes/65363

Cited by 25 publications

(9 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, it has several drawbacks such as low quantum yield, the high recombination rate of photo-induced hole-electron pairs, and instability [20,27], which hinder its commercial applications [10,21,28,29]. To overcome these drawbacks of ZnO, many different approaches have been developed such as metal doping of ZnO [30][31][32][33][34], organic modification of the surface, and semiconductor coupling [35].…”

Section: Introductionmentioning

confidence: 99%

“…Cerium has been used as dopant in ZnO to increase its photocatalytic activity because it acts as an electron reservoir [27]. The most applied metal/ZnO nanocomposite is Ag/ZnO [11,19,26,30,31,35,36], due to the Ag nanoparticles antibacterial [37], and catalytic activity since it has a high surface area [9,24]. Furthermore, Ag is recognized as an electron sink.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Green Synthesis of an Activated Carbon-Supported Ag and ZnO Nanocomposite for Photocatalytic Degradation and Its Antibacterial Activities

2020

View full text Add to dashboard Cite

In this study Ag nanoparticles (AgNPs), ZnO nanoparticles (ZnONPs), and Ag/ZnO nanocomposites were greenly synthesized and loaded on activated carbon via three different routes: simple impregnation, successive precipitation, and co-precipitation. Neem leaf extract was used as a reducing and stabilizing agent. The morphological and structural properties of the synthesized nanocomposites have been examined using different analytical techniques such as XRD, SEM, FTIR, and UV. The antibacterial and catalytic activity of the synthesized nanocomposites were examined and compared. The results showed that AgNPs loaded on activated carbon (Ag/AC) has the best catalytic activity compared to the other nanocomposites, which is attributed to the good dispersal of AgNPs on the surface of activated carbon. Furthermore, AgNPs showed the best antibacterial effect on eight out of 16 tested pathogens. Results also showed that the order of precipitation is an important factor, as both antibacterial activities and photodegradation activities were higher for ZnO/Ag/AC than Ag/ZnO/AC. Furthermore, the co-precipitation method was shown to be better than the successive precipitation method for 4-nitrophenol photodegradation and 14 out of the 16 antibacterial tests performed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Green Synthesis of an Activated Carbon-Supported Ag and ZnO Nanocomposite for Photocatalytic Degradation and Its Antibacterial Activities

2020

View full text Add to dashboard Cite

show abstract

“…The reduction in charge density occurred due to the transfer of electrons from Ag to the conduction band of ZnO at the interface, creating a new Fermi energy level for ZnO:Ag nanocomposite. [ 40–42 ]…”

Section: Resultsmentioning

confidence: 99%

Active Light‐Powered Antibiofilm ZnO Micromotors with Chemically Programmable Properties

Ussia

Urso

Dolezelikova

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Bacterial biofilms are multicellular communities firmly attached to solid extracellular substrates. They are considered the primary cause of huge economic losses, from medicine due to medical implants’ failure to large infrastructure due to enhanced pipe corrosion. Therefore, their eradication is highly desirable. Here, the preparation of ZnO self‐propelled micromotors is reported, programming their morphology and motion properties through Ag doping. The ZnO:Ag micromotors actively move upon light irradiation via a self‐electrophoretic mechanism, showing excellent light‐controlled on/off switching motion. At the same time, the rapid and effective removal of both gram‐positive and gram‐negative bacteria biofilms from the solid surface is demonstrated, exploiting the well‐known antibacterial activity of both Ag and ZnO as well as the enhanced diffusion of the micromotors. The new concept for the low‐cost and scalable preparation of chemically programmable Ag‐doped ZnO micromotors here illustrated opens a new route toward the formulation of a new class of light‐driven semiconducting self‐propelled micromotors for environmental applications.

show abstract

“…Employing nanotechnology into dye degradation domain shows great prospective, as nanoparticles can react with dyes chemically; producing non-toxic products that may not require removal (Viswanathan 2018). For instance, Ag NPs play an important role in the improvement of photocatalytic performance for the organic dyes' degradation (Wu et al 2017). For that reason and to treat relatively poor e cacy of catalysts at high concentration level of dye (49% at equilibrium for 60 ppm MO and 5% MgO), we proved the positive in uence of Ag NPs on the as-synthesized catalyst.…”

Section: Impact Of Silver On Alg-(mgo/cs) Beads On Highly Concentratementioning

confidence: 99%

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Elfadl

El-Sherif

Deghiedy

2021

Preprint

View full text Add to dashboard Cite

Practically, 12% of used dyes are excluded as waste in the mobile aqueous environment. Methyl orange (MO), an industrial azo dye, is known to be carcinogenic. Accordingly, this work was engaged to fabrication of a high-efficiency visible light photocatalysts based on Ag-Alginate/Chitosan-coated MgO nanocomposite beads. MgO and Ag were prepared via precipitation and γ-radiation reduction technique as a green physical one, respectively. The degradation mechanisms depended on catalytic reduction by means of sodium borohydride/Ag and photo oxidative degradation. XRD proved the periclase crystalline form of MgO of size 20 nm and the formation of face centered cubic silver crystals of size 15 nm. The degradation yield varied directly with time, MgO and dye concentration until certain limit. Five and twenty minutes were enough to get clear solution of MO (30 and 15 ppm, respectively) while 60 min was required to achieve the same target for 60 ppm MO solution. The catalysts showed high efficiency for MO of high concentration. The incorporation of Ag into catalytic beads could support both mechanisms as it could elevate the degradation efficiency up to 50% and save the time to a great extent. Thus, this carrier fruitfully converted wastewater into an effluent that can be repaid to the water cycle with minimal strike on the ecosystem.

show abstract

Hierarchical Ag-ZnO Microspheres with Enhanced Photocatalytic Degradation Activities

Cited by 25 publications

References 24 publications

Green Synthesis of an Activated Carbon-Supported Ag and ZnO Nanocomposite for Photocatalytic Degradation and Its Antibacterial Activities

Green Synthesis of an Activated Carbon-Supported Ag and ZnO Nanocomposite for Photocatalytic Degradation and Its Antibacterial Activities

Active Light‐Powered Antibiofilm ZnO Micromotors with Chemically Programmable Properties

Environmentally Benign Hybrid Nanocomposite Beads for Azo Dyes Remediation via Synchronized Dual Degradation Mechanisms

Contact Info

Product

Resources

About