Synthesis, characterisation, and effect of pH on degradation of dyes of copper-doped TiO2

Thu, Trang Nguyễn; Thi, Nhiem Nguyen; Vinh, Trần Quang; Hong, Khanh Nguyen; Minh, Tan Nguyen; Hoai, Nam Le Thi

doi:10.1080/17458080.2015.1053541

Cited by 83 publications

(26 citation statements)

References 35 publications

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“…This sig-nificant decrease may be accounted for by the aggregation of nanoparticles as observed in SEM images and increase in the TiO 2 particle size. This trend is frequently found when doping TiO 2 with metals as reported by Thu et al [38] for the Cu-doped TiO 2 . Figure 3 shows the relevant regions to this study of FT-IR spectra of TiO 2 -PC500 (a) and Ag/TiO 2 -PC500 (b).…”

Section: Surface Areasupporting

confidence: 73%

Photoctalytic Efficiency of Silver Doped TiO2-PC500 for Dyes Removal from Water under UV and Solar Radiations: Comparative Study

Mezbour

Ghorab

2019

J. of Wat. & Envir. Tech.

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Silver doped TiO 2 -Millenium-PC500 (Ag/TiO 2 -PC500) was prepared by wet chemical reduction method and characterized by X-ray diffraction, scanning electron microscopy, X-ray fluorescence, fourier transformed infrared and Brunauer-Emmett-Teller techniques. Ultraviolet (UV) and solar photocatalytic efficiency of Ag/TiO 2 -PC500 for the removal of congo red (CR) and crystal violet (CV) from water was investigated. The influence of several operational parameters (photocatalyst, dye concentrations, pH, H 2 O 2 ) was studied. Ag/TiO 2 -PC500 exhibits better performance under UV and solar irradiations for the discoloration of CR as compared to TiO 2 -PC500. In the presence of Ag/ TiO 2 -PC500, at free pH, CR was completely discolored within 15 min under UV (k = 0.064 min −1 ) and solar irradiation (k = 0.207 min −1 ). The discoloration rates of CV markedly improved under UV and solar irradiation, with Ag/TiO 2 -PC500 as compared to TiO 2 -PC500 albeit not complete (R ≤ 63.9%). Addition of H 2 O 2 (0.01 mol L −1 ) improved significantly the discoloration of CV (R ≤ 99.3%) with both photocatalysts whatever the light source. The better performance of Ag/TiO 2 -PC500 (84.87 m 2 g −1 ) as compared to TiO 2 -PC500 (287.09 m 2 g −1 ) confirms the positive contribution of silver during the photocatalytic process through its ability to absorb UV and solar light and slow the electron-hole (e − /h + ) recombination. The COD measurements show moderate mineralization rates for both dyes independently of the irradiation source.

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Section: Surface Areasupporting

confidence: 73%

Photoctalytic Efficiency of Silver Doped TiO2-PC500 for Dyes Removal from Water under UV and Solar Radiations: Comparative Study

Mezbour

Ghorab

2019

J. of Wat. & Envir. Tech.

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“…A variation was observed in the pH of the sludge sample and the stock solution, i.e., the pH was at 8.18 in the 1st week and 8.28 in the 4th week and later on marginal changes between 8.30 ± 0.02 were detected. The previous research investigations illustrated that higher dye degradation takes place at neutral/basic pH values 68 . The pH was declined from 12.2 to 8 and was associated with maximum dye degradation 69 .…”

Section: Resultsmentioning

confidence: 96%

Assessment of the aerobic glass beads fixed biofilm reactor (GBs-FBR) for the treatment of simulated methylene blue wastewater

Donkadokula

Kola

Saroj

2020

Sci Rep

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The present research is focused on the application of glass beads (GBs) in fixed biofilm reactor (FBR) for the treatment of simulated methylene blue (MB) wastewater for 9 weeks under aerobic conditions. The COD of MB wastewater showed a reduction of 86.48% from 2000 to 270.4 mg/L, and BOD was declined up to 97.7% from 1095.5 to 25.03 mg/L. A drastic increase in the pH was observed until the 3rd week (8.5 to 8.28), and later, marginal changes between 8.30 ± 0.02 were noticed. A dramatic fluctuation was observed in ammonia concentration which increased (74.25 mg/L) up till the 2nd week, and from the 3rd week it started declining. In the 9th week, the ammonia concentration dropped to 16.5 mg/L. The color intensity increased significantly up till the 2nd week (259,237.46 Pt/Co) of the experiment and started decreasing slowly thereafter. The SEM–EDX analysis has shown the maximum quantity of carbon content in the GBs without biofilm, and then in the GB samples of 1st, and 9th-week old aerobic biofilms. Furthermore, Raman spectroscopy results revealed that the 9th-week GBs has a fine and strong MB peak and matched with that of the MB stock solution. Overall, the results have shown that the GBs filter media were suitable for the development of active biofilm communities for the treatment of dye wastewater. Thus, GBs-FBR system can be used for wastewater treatment to solve the current problem of industrial pollution in many countries and to protect the aquatic environment from dye pollution caused by the textile industry.

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“…It should be pointed out that the highest degradation rate of dyes happens at the optimum level of transition metals; this is because of the fact that the ions of copper deposit on the photocatalyst particles. As a result, oxygen vacancies are produced on the photocatalyst surface, thereby trapping the photogenerated electrons [47,48]. On the other hand, when the content of dopant ions exceeds the optimum level, extra oxygen vacancies and Cu ions can recombine photoinduced electrons and holes; all this leads to decreasing the photocatalytic performance of the photocatalyst [47].…”

Section: Effect Of Dopant Percentage and Irradiation Type Sourcementioning

confidence: 99%

“…On the other hand, when the content of dopant ions exceeds the optimum level, extra oxygen vacancies and Cu ions can recombine photoinduced electrons and holes; all this leads to decreasing the photocatalytic performance of the photocatalyst [47]. Moreover, when there are a higher number of dopants, extra ions of which deposit on the surface of photocatalyst particles instead of diffusing into photocatalyst lattice; this hinders the penetration of UV light and, in turn, active sites of the catalyst are blocked [48]. Of course, these changes depend on various factors, including the type of dopant and its concentration.…”

Section: Effect Of Dopant Percentage and Irradiation Type Sourcementioning

confidence: 99%

Evaluation of Sonocatalytic and Photocatalytic Processes Efficiency for Degradation of Humic Compounds Using Synthesized Transition-Metal-Doped ZnO Nanoparticles in Aqueous Solution

Maleki

Seifi

Marzban

2021

Journal of Chemistry

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The existence of a humic substance in water causes the growth of microorganisms and reduces the quality of water; therefore, the removal of these materials is crucial. Here, the ZnO nanoparticles doped using transition metals, copper (Cu) and manganese (Mn), were used as an effective catalyst for photocatalytic removal of humic substances in an aqueous environment under ultraviolet, visible light, and light-emitting diode irradiations. Also, we study the effect of the sonocatalytic method. A solvothermal procedure is used for doping, and the Cu- and Mn-doped ZnO nanocatalyst were characterized by means of FTIR, XRD, AFM, SEM, and EDAX analyses. We investigate the effect of operational variables, including doping ratio, initial pH, catalyst dose, initial HS content, and illuminance on the removal efficiency of the processes. The findings of the analyses used for the characterization of the nanoparticles illustrate the appropriate synthesis of the Cu- and Mn-doped ZnO nanocatalysts. We observe the highest removal efficiency rate under acidic conditions and the process efficiency decreased with increasing solution pH, when we tested it in the range of 3–7. Photocatalytic decomposition of HS increases with a rise in catalyst dose, but an increase in initial HS content results in decreasing the removal efficiency. We observe the highest photocatalytic degradation of humic acid while using the visible light, and the highest removal efficiency is obtained using Cu.ZnO. The Cu.ZnO also shows better performance under ultraviolet irradiation compared to other agents.

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Synthesis, characterisation, and effect of pH on degradation of dyes of copper-doped TiO₂

Cited by 83 publications

References 35 publications

Photoctalytic Efficiency of Silver Doped TiO<sub>2</sub>-PC500 for Dyes Removal from Water under UV and Solar Radiations: Comparative Study

Photoctalytic Efficiency of Silver Doped TiO<sub>2</sub>-PC500 for Dyes Removal from Water under UV and Solar Radiations: Comparative Study

Assessment of the aerobic glass beads fixed biofilm reactor (GBs-FBR) for the treatment of simulated methylene blue wastewater

Evaluation of Sonocatalytic and Photocatalytic Processes Efficiency for Degradation of Humic Compounds Using Synthesized Transition-Metal-Doped ZnO Nanoparticles in Aqueous Solution

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