Excellent visible-light driven photocatalyst of (Al, Ni) co-doped ZnO structures for organic dye degradation

Reddy, I. Neelakanta; Reddy, Ch. Venkata; Shim, Jaesool; Akkinepally, Bhargav; Cho, Migyung; Yoo, Kisoo; Kim, Dongseob

doi:10.1016/j.cattod.2018.07.030

Cited by 93 publications

(28 citation statements)

References 66 publications

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“…This may be due to the less concentration of Zn in the Co–ZnO sample as compared to ZnO. 31 , 32 Figure 3 b shows the O 1s core-level spectra of the ZnO and Co–ZnO. The O 1s core-level spectra exhibit two peaks at binding energies 529.3 and 531.5 eV which represent lattice oxygen (O L ) and chemisorbed oxygen (O H ), respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Co–ZnO and Evaluation of Its Photocatalytic Activity for Photodegradation of Methyl Orange

et al. 2021

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Photocatalysis is one of the techniques used for the eradication of organic pollutants from wastewater. In this study, Co−ZnO was tested as a photocatalyst for the degradation of methyl orange under irradiation of visible light. Co−ZnO loaded with 5%, 10%, and 15% Co was prepared by the precipitation method. The advanced techniques including X-ray diffraction, X-ray photoelectron spectroscopy, diffuse reflectance UV−visible spectroscopy, photoelectrochemical measurements, temperatureprogrammed desorption, photoluminescence, and fluorescence spectroscopy related to OH • measurements were used for characterization of prepared Co−ZnO. Experiments showed that 10% Co−ZnO was a highly efficient catalyst for the photodegradation of methyl orange as compared to ZnO. The enhanced photocatalytic activity of Co−ZnO is attributed to the implantation of Co which inhibits the electron−hole recombination. A 100 mg/L solution of methyl orange dye was completely degraded within 130 min. The reaction kinetics has been described in terms of the Eley−Rideal mechanism.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Co–ZnO and Evaluation of Its Photocatalytic Activity for Photodegradation of Methyl Orange

et al. 2021

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“…The enhanced hydrogen evolution was assigned to increased light absorption and decreased band gap [12]. Anorkon et al reported sono-chemical synthesized Eu doped ZnO photocatalyst towards waste treatment [13].…”

Section: Introductionmentioning

confidence: 99%

Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications

Ahmad

Akhtar

Ahmed

et al. 2020

Separation and Purification Technology

112

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A novel europium (Eu) and terbium (Tb) co-doped ZnO nanoparticles had been synthesized by a facile, cost efficient and rapid combustion method. The physical and chemical properties of the as-synthesized nanoparticles were determined by XRD, SEM, EDS, BET, FTIR, XPS, UV-vis DRS, PL, EIS and photocurrent density. XRD patterns confirm that Eu and Tb ions are stably inserted into the framework of ZnO, and the crystallite size decreases to 21 nm compared to that of pure ZnO (32 nm) as the amount of co-dopants increases to optimal value (3 mol% of each). With the insertion of Eu and Tb ions into ZnO, the recombination rate of photo generated charge carriers is found to be low. It is observed that doped Eu and Tb ions can enter the lattice structure of ZnO with a suitable doping concentration, and the obtained doped ZnO have ordered hexagonal wurtzite structures and nearly spherical morphology with high specific surface area and high porosity. Meanwhile, the introduction of Eu and Tb ions can effectively extend the spectral response from UV to visible region for the catalysts, thus reducing the band gap from 3.25 to 2.91 eV. Further analysis by means of XPS measurement showed that the existence of mixture of Eu 2+/ Eu 3+ and Tb 3+/ Tb 4+ oxidation states and high content of the surface chemisorbed oxygen species also contributed to the high photocatalytic activity. It was found that Eu and Tb co-doped ZnO shows highly efficient and stable visible light activity and provides a 100% MB degradation within 15 min, while the degradation time for Eu doped ZnO and Tb doped ZnO is reduced gradually to 50 and 42 min, respectively to obtain the 100% MB degradation. It was also found that the photocatalytic hydrogen evolution activity over Eu and Tb co-doped ZnO can be significantly increased to 533.8 and 792 µmol with 0.2 wt% catalyst dose and initial solution pH 9, respectively under similar conditions with good stability. Moreover, simultaneous introduction of Eu and Tb effectively promoted the yield of CH 4 to 4.59 µmol, which was 3.4 fold higher in comparison to pure ZnO. Thus the present approach could provide a versatile strategy for the synthesis of novel and efficient visible light activated photocatalysts.

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“…The elemental and chemical states of prepared CoO-ZnO were determined by XPS analysis. The Zn 2p core-level spectra given in Figure 1b show the existence of Zn 2p3/2 and Zn 2p1/2 regarding peaks at binding energy ~ 1022 eV and ~1047 eV respectively (Reddy et al 2020) (Achouri et al 2016). The O 1s core-level spectra given in Figure 1c .…”

Section: Characterizationmentioning

confidence: 98%

Synthesis of p-n CoO-ZnO Heterojunction for Enhanced Visible-Light Assisted Photodegradation of Methylene Blue

Saeed

Adeel

Khan

et al. 2021

Preprint

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The synthesis of p-n heterojunction has received much attention in the eradication of organic pollutants from water. In this study, p-n CoO-ZnO heterojunction is reported as an efficient visible-light-driven photocatalyst for degradation of methylene blue. The formation of CoO-ZnO was determined by XRD, XPS, UV-vis DRS, SEM, and EDS analyses. The p-n CoO-ZnO prepared by precipitation method showed an enhanced photocatalytic activity under the irradiation of visible light compared to ZnO. A 100 mg/L methylene blue is degraded almost completely within 2 hours under visible irradiation. The enhanced photocatalytic efficiency is attributed to the synergistic effect of p-n heterojunction that dramatically reduces the recombination of holes and electrons initiated by irradiation. The role played by hydroxyl radicals in photodegradation of methylene blue was determined by photoluminescence emission and fluorescence spectroscopy.

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Excellent visible-light driven photocatalyst of (Al, Ni) co-doped ZnO structures for organic dye degradation

Cited by 93 publications

References 66 publications

Synthesis and Characterization of Co–ZnO and Evaluation of Its Photocatalytic Activity for Photodegradation of Methyl Orange

Synthesis and Characterization of Co–ZnO and Evaluation of Its Photocatalytic Activity for Photodegradation of Methyl Orange

Rare earth co-doped ZnO photocatalysts: Solution combustion synthesis and environmental applications

Synthesis of p-n CoO-ZnO Heterojunction for Enhanced Visible-Light Assisted Photodegradation of Methylene Blue

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