Synthesis and characterization of metal oxides (CeO 2 , CuO, NiO, Mn 3 O 4 , SnO 2 and ZnO) nanoparticles as photo catalysts for degradation of textile dyes

Gnanasekaran, Lalitha; Hemamalini, R.; Saravanan, R.; Ravichandran, K.; Gracia, F.; Agarwal, Shilpi; Gupta, Vinod Kumar

doi:10.1016/j.jphotobiol.2017.05.027

Cited by 177 publications

(45 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7][8][9] Over the years, a variety of semiconducting materials have been employed for the abatement of toxic organic pollutants under UV or visible light irradiation. [10][11][12][13][14][15][16][17] Among these, ZnO and TiO 2 stand out as the most promising materials due to their non-toxic and stable nature. 8,10,[18][19][20][21][22][23][24] Earlier reports indicate that ZnO has the ability to sufficiently mineralize the organic pollutants into less toxic substances and can absorb more quanta of light than that of the TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17] Among these, ZnO and TiO 2 stand out as the most promising materials due to their non-toxic and stable nature. 8,10,[18][19][20][21][22][23][24] Earlier reports indicate that ZnO has the ability to sufficiently mineralize the organic pollutants into less toxic substances and can absorb more quanta of light than that of the TiO 2 . [25][26][27][28] The above merits make ZnO a better candidate for the degradation of organic compounds under light irradiation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

View full text Add to dashboard Cite

Rare earth metal doping into semiconductor oxides is considered to be an effective approach to enhance photocatalytic activity due to its ability to retard the electron-hole pair recombination upon excitation.Herein, we report the synthesis of different rare earth metal (La, Nd, Sm and Dy)-doped ZnO nanoparticles using a facile sol-gel route followed by evaluation of their photocatalytic activity by studying the degradation of methylene blue (MB) and Rhodamine B (RhB) under UV-light irradiation.Different standard analytical techniques were employed to investigate the microscopic structure and physiochemical properties of the prepared samples. The formation of the hexagonal wurtzite structure of ZnO was established by XRD and TEM analyses. In addition, the incorporation of rare earth metal into ZnO is confirmed by the shift of XRD planes towards lower theta values. All metal doped ZnO showed improved photocatalytic activity toward the degradation of MB, of which, Nd-doped ZnO showed the best activity with 98% degradation efficiency. In addition, mineralization of the dye was also observed, indicating 68% TOC removal in 180 min with Nd-doped ZnO nanoparticles. The influence of different operational parameters on the photodegradation of MB was also investigated and discussed in detail.Additionally, a possible photocatalytic mechanism for degradation of MB over Nd-doped ZnO nanoparticles has been proposed and involvement of hydroxyl radicals as reactive species is elucidated by radical trapping experiments.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

View full text Add to dashboard Cite

show abstract

“…NiO nanostructures are chemically stable and has good electrical conductivity as well as magnetic and optical properties, which make it a promising material for technological applications such as antiferromagnetic materials (7), electrode materials for lithium-ion batteries (8), electrochemical supercapacitors (9), gas sensors adsorbents (10), optical amplifier and tunable laser (11), photovoltaic devices (12) and electrochromic materials (13,14). Methods such as sol-gel method (15), solvothermal route (16), hydrothermal (17), thermal decomposition (18), precipitation method (19), and plants such as Moringa oleifera (20), Tamarix serotine (21), Callistemon viminalis (22) and Agathosma betulina (23) allow the synthesis of NiO nanostructures. Among them, TiO 2 is one of the excellent metal oxide photocatalysts for water splitting and oxidative degradation of organic pollutants (24,25).…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and photocatalytic applications of biosynthesized NiO nanocrystals

Diallo

Kaviyarasu

Ndiaye

et al. 2018

Green Chemistry Letters and Reviews

View full text Add to dashboard Cite

NiO is one of the most important candidates for semiconductors metal oxide nanocrystals by the arrangement of photocatalytic application. However, the photocatalytic performance of biosynthesized nanocrystals using Aspalathus linearis (Burm.f.) R. Dahlgren has not been investigated yet. In this contribution, we synthesize α-Ni(OH) 2 using an A. linearis. A heat treatment of the α-Ni(OH) 2 is carried out at 300-400°C for 2 h at normal air yields. Furthermore, we have characterized the structural, optical and photocatalytic activity of the samples. The optical results indicate that biosynthesized nanocrystals exhibit UV-visible light absorption and a narrow range distribution of intense green light (518.95 nm) emission, which decreases significantly as annealing temperature increases. The bandgap energies of the sample annealed at 300-400°C shift to lower photon energy, compared to bulk NiO (∼ 4 eV). Moreover, the photocatalytic experimental results reveal that NiO nanocrystals enable color switching of methylene blue.

show abstract

“…The incredible potential of these materials, which has attracted great enthusiasm from researchers in the past a few decades, renders them strong candidates for a variety of applications that range from photocatalytic water splitting [1–2], organic pollution degradation [3–6], nitrogen fixation [7–8], to solar fuel production [9]. The metal oxides, such as CdO [10], Al 2 O 3 [11], and CuO [12–13], has attracted a lot of interest in photocatalytic applications. And among all of these metal oxides, it is titanium dioxide and zinc oxide (TiO 2 and ZnO) that are the most widely exploited by taking advantage of their long-term stability and environmental non-toxicity, in addition to providing a low-cost alternative to the n-type semiconductor photocatalysts [14–16].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of a ZnO–BiOI p–n nano-heterojunction with excellent visible-light photocatalytic activity

Zhang¹,

Qin²,

Yu³

et al. 2018

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

In this paper, an efficient method to produce a ZnO/BiOI nano-heterojunction is developed by a facile solution method followed by calcination. By tuning the ratio of Zn/Bi, the morphology varies from nanoplates, flowers to nanoparticles. The heterojunction formed between ZnO and BiOI decreases the recombination rate of photogenerated carriers and enhances the photocatalytic activity of ZnO/BiOI composites. The obtained ZnO/BiOI heterostructured nanocomposites exhibit a significant improvement in the photodegradation of rhodamine B under visible light (λ ≥ 420 nm) irradiation as compared to single-phase ZnO and BiOI. A sample with a Zn/Bi ratio of 3:1 showed the highest photocatalytic activity (≈99.3% after 100 min irradiation). The photodegradation tests indicated that the ZnO/BiOI heterostructured nanocomposites not only exhibit remarkably enhanced and sustainable photocatalytic activity, but also show good recyclability. The excellent photocatalytic activity could be attributed to the high separation efficiency of the photoinduced electron–hole pairs as well as the high specific area.

show abstract

Synthesis and characterization of metal oxides (CeO 2 , CuO, NiO, Mn 3 O 4 , SnO 2 and ZnO) nanoparticles as photo catalysts for degradation of textile dyes

Cited by 177 publications

References 45 publications

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Structural, optical and photocatalytic applications of biosynthesized NiO nanocrystals

Facile synthesis of a ZnO–BiOI p–n nano-heterojunction with excellent visible-light photocatalytic activity

Contact Info

Product

Resources

About