Biogenic mediated Ag/ZnO nanocomposites for photocatalytic and antibacterial activities towards disinfection of water

Panchal, Priyanka; Paul, Devina Rattan; Sharma, Anshu; Choudhary, Pratibha; Meena, Parmeshwar Lal; Nehra, S.P.

doi:10.1016/j.jcis.2019.12.079

Cited by 185 publications

(40 citation statements)

References 59 publications

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“…Opaque peptidoglycan layer of gram-positive cell membrane leads to an arduous nanoparticle penetration, translated in a decreased inhibition zone compared to the gram-negative bacteria [51]. Controversially, thin peptidoglycan layer of gram-negative cell membrane with negative charge bound to positive charge coming from AgNps [31]. Table 3.…”

Section: Catalysis Activity Of the Prepared Samplesmentioning

confidence: 99%

“…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%

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

2020

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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.

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Section: Catalysis Activity Of the Prepared Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

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“…The crystallite size (L) was estimated by means of the Debye Scherrer's equation, Eq (1). These values are recorded in Table 1.…”

Section: Structural and Optical Analysismentioning

confidence: 99%

“…The deposition of Ag nanoparticles on a semiconductor metallic oxide surface can increase the interfacial charge-transfer kinetics to metals and semiconductors, which can lead to an increase in the Ag doped ZnO nanoparticles antibacterial properties. Panchal et al [1] disclosed the green synthesis process of ZnO nanoparticles and Ag/ZnO nanocomposites by means of Ocimum tenuiflorum plant extract. They obtained 1.0% Ag/ZnO nanocomposites with hexagonal structure, size ranging between 14 and 22 nm and excellent antimicrobial performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of tungsten doping on the structural, morphological and bactericidal properties of nanostructured CuO

et al. 2020

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Copper oxide (CuO) has been broadly used in different technological and biological applications. However, based on the literature review, there are few reports describing the synthesis of tungsten doped copper oxide and its biological applications, although CuO and W (tungsten) based nanomaterials have been reportedly already synthesized. In this study we synthesized novel CuO and CuO/W (at.1%, 2% and 4%) nanoparticles and explored their tungsten content-dependent bactericide activity. In order to obtain the materials, was used a co-precipitation method which is of low cost. The synthesized materials were characterized by x-ray diffraction (XRD); XRD results indicated that only the sample with at.1% of W presented pure Tenorite phase. Diffuse reflectance spectroscopy (DRS) allowed to obtain the band gap energy values; CuO/W (at.2%) sample exhibited the minimum value of 2.62 eV. Grains sizes ranging from 39.78 to 53.47 nm were established through field emissionscanning electronic microscopy (FE-SEM), and these sizes were confirmed by transmission electron microscopy (TEM). Doping with W also influenced the morphology obtained in all cases. BET (Brunauer, Emmett, Teller) analysis allowed to establish an increase in specific surface area and pore size with W doping. The particle size was determined by dynamic light scattering (DLS). The bactericidal properties were tested using well diffusion method for Escherichia coli and Staphylococcus aureus bacteria. Bactericide response of CuO nanoparticles was improved by the inclusion of W dopant into the CuO structure, leading to an expansion in the inhibition zone for the CuO/W (at.1%) sample; inhibition halo diameters were 1.5 and 12 mm for CuO and CuO/W (at.1%), respectively. Hence, it was possible to

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Nanomaterials in Antibacterial Photodynamic Therapy and Antibacterial Sonodynamic Therapy

He,

Feng,

Hao

et al. 2024

Adv Funct Materials

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Antibacterial photodynamic therapy (aPDT) and antibacterial sonodynamic therapy (aSDT) utilize sensitizers (photosensitizers/sonosensitizers) to produce reactive oxygen species (ROS) for antibacterial treatment under the stimulation of light/ultrasound, which have the characteristics of broad‐spectrum antibacterial properties, low drug‐resistance, and effective targeting of infected tissues. Nanomaterials in aPDT/aSDT are primarily used as nano‐sensitizers or nano‐carriers of sensitizers. They enhance the stability and permeability of sensitizers, improve targeting of sensitizers, strengthen photodynamic/sonodynamic properties of sensitizers (modification of sensitizers absorption efficiency and light/ultrasonic response stress by modulation of nanoparticle shape, size, and structure). Also, they improve modifiability of sensitizers (controlling the release rate and time of the sensitizer as needed to optimize the therapeutic effect), enhance programmability and multifunctionality of sensitizers (flexible application of nanotechnology for designing sensitizers with multiple functions, such as drug delivery, targeted therapy, and therapeutic monitoring), and expand possibilities for combination therapies (the nano‐carriers can be loaded with other therapeutic agents, enabling combination therapies). Nanomaterials are expected to further promote the development of aPDT/aSDT and achieve improved antibacterial effects. This review summarizes the progress in nanomaterials in aPDT/aSDT in recent years and based on the current development strategies to provide a theoretical reference for the application of nanomaterials in aPDT/aSDT.

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Biogenic mediated Ag/ZnO nanocomposites for photocatalytic and antibacterial activities towards disinfection of water

Cited by 185 publications

References 59 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

Effect of tungsten doping on the structural, morphological and bactericidal properties of nanostructured CuO

Nanomaterials in Antibacterial Photodynamic Therapy and Antibacterial Sonodynamic Therapy

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