Effect of pH on Adsorption and Photocatalytic Degradation Efficiency of Different Catalysts on Removal of Methylene Blue

Alkaim, Ayad F.; Aljeboree, Aseel M.; Alrazaq, N. A.; Baqir, Sadiq J.; Hussein, Falah H.; Lilo, A. J.

doi:10.14233/ajchem.2014.17908

Cited by 100 publications

(38 citation statements)

References 26 publications

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“…The CFVP dissociation constant pK a has not been determined, but based on the analysis of dissociation constants of other organophosphorus pesticides it can be concluded that this pesticide is negatively charged at pH > 6, therefore it is better adsorbed at lower pH. For organic pollutants (e.g., azo dyes), similar conclusions were made by Alkaim et al (2014) [45]. At pH <6, strong dye adsorption was observed on TiO 2 particles as a result of electrostatic attraction of positively charged TiO 2 .…”

Section: Effect Of Ph On the Chlorfenvinphos Degradationmentioning

confidence: 75%

TiO2 Modified with Organic Acids for the Decomposition of Chlorfenvinphos under the Influence of Visible Light: Activity, Performance, Adsorption, and Kinetics

Zawadzki

2020

Materials

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Photocatalytic decomposition of chlorfenvinphos (CFVP) in the presence of titanium dioxide (TiO2) modified with organic acids: pyruvic (PA) and succinic (SA) under the visible light radiation has been studied. The following tests were examined: dose of photocatalysts, adsorption time, pH of the model solution, deactivation of catalysts, the role of oxygen, identification of free radicals for the CFVP decomposition, Langmuir-Hinshelwood kinetics. The synthesized materials were characterized by Scanning Electron Microscopy (SEM) and UV-Vis. At 10 wt.% of acid (90:10) decomposition of chlorfenvinphos was the most effective in the following conditions: dose of catalyst 50.0 mg/L, time of adsorption = 20 min, pH of model solution = 3.0. Under these conditions the order of photocatalyst efficiency has been proposed: TiO2/PA/90:10 > TiO2/SA/90:10 > TiO2 with the removal degree of 85, 72 and 48%. The mathematically calculated half-life at this conditions was 27.0 min and 39.0 min for TiO2/PA/90:10 and TiO2/SA/90:10 respectively, compared to 98 min for pure TiO2. It has been determined that the O2•− radicals and holes (h+) are the main reactive species involved in the photodegradation of chlorfenvinphos. The results of this study showed that method may be an interesting alternative for the treatment of chlorfenvinphos contaminated wastewater.

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Section: Effect Of Ph On the Chlorfenvinphos Degradationmentioning

confidence: 75%

TiO2 Modified with Organic Acids for the Decomposition of Chlorfenvinphos under the Influence of Visible Light: Activity, Performance, Adsorption, and Kinetics

Zawadzki

2020

Materials

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“…Here, the effect of pH on MB photodegradation efficiency was studied at pH 5.5, 7.5, and 9.5. As shown in Figure 5c, the photodegradation efficiency of MB was significantly higher in alkaline conditions, which could be attributed to the greater interaction between the photocatalyst and MB (note that MB is a cationic compound) and to the high hydroxylation of the photocatalyst surface as a consequence of the large amount of hydroxyl ions, which translated to the more efficient formation of hydroxyl radicals [34][35][36]. More importantly, recycling experiments using ZnO-based micro/nanoferns at different pH demonstrated that in more acidic environments, the recyclability was significantly decreased, indicating that ZnO dissolution and photocorrosion increased.…”

Section: Adsorption Experimentsmentioning

confidence: 91%

Bioinspired ZnO-Based Solar Photocatalysts for the Efficient Decontamination of Persistent Organic Pollutants and Hexavalent Chromium in Wastewater

2019

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Biomimetic/bioinspired engineering and sulfidation processes are effective strategies for improving the visible light-driven photocatalytic performance of ZnO photocatalysts. A facile electrodeposition process in high oxygen-flux conditions was used to synthesize well-defined fractal micro/nanoferns, consequently increasing the photocatalyst’s light-trapping capability and the accessible active surface. Next, a simple sulfidation process was used to form a thin layer of ZnS, producing ZnO@ZnS core@shell micro/nanoferns, thereby tuning the optoelectronic properties and extending the photoresponse to the visible region. The ZnO@ZnS micro/nanoferns exhibited clear superiority over other ZnO photocatalysts in the photooxidation of persistent organic pollutants (POPs) and the photoreduction of Cr(VI). Their excellent photocatalytic performance allowed the photodegradation under UV-filtered sunlight of nearly 97% of methylene blue after 60 min; the mineralization of >98% of a mixture of methylene blue, 4-nitrophenol, and rhodamine-B after 210 min; and the removal of nearly 65% of Cr(VI) after 180 min. In addition, the ZnO@ZnS micro/nanoferns demonstrated a good ability to decontaminate an inorganic-organic bipollutant system, with promising potential to leverage synergistic effects. Finally, these micro/nanoferns presented great recyclability and reusability for both photooxidation and photoremediation processes. These findings support that sulfidation and biomimetic engineering can be a superior route for designing efficient sunlight-driven ZnO-photocatalysts for water decontamination.

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“…The pH of the dye plays an important role in dye degradation, since, the adsorption capacity of dyes on the photo catalyst is an important factor. An increase in the rate of molecule decomposition is the result of an increase in the number of target molecules adsorbed onto a catalyst [27]. In this study, the effect of pH on the photocatalytic activity of CeO 2 nano particles (10 mg/L) during the MB degradation process with an initial concentration of 5 mg/L over a pH ranges 1-12 was studied.…”

Section: Degradation Of Mb Catalysed By Cerium Oxidementioning

confidence: 99%

Photocatalytic activity of biosynthesized CeO2 nano particles

Ramanathan¹,

Rathan²,

Murali

2018

SN Appl. Sci.

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This paper focuses on a cost effective and environment friendly technique for green synthesis of cerium oxide (CeO 2) nano particles from cerium (III) nitrate hexahydrate solution by co-precipitation method using the leaf extract of different species of Artemisia pallens which acts as reducing and capping agent. The prepared CeO 2 nano particles were characterized by XRD, TEM, FTIR, UV-Vis spectroscopy. The Photocatalytic activity of the prepared ceria powders was determined by their ability to degrade Methylene blue solution under UV-light radiation. The photo degradation result observed with 10 mg/L ceria at pH = 11 for 180 min have highest output and pseudo 1st order rate constant was 0.983.

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Effect of pH on Adsorption and Photocatalytic Degradation Efficiency of Different Catalysts on Removal of Methylene Blue

Cited by 100 publications

References 26 publications

TiO2 Modified with Organic Acids for the Decomposition of Chlorfenvinphos under the Influence of Visible Light: Activity, Performance, Adsorption, and Kinetics

TiO2 Modified with Organic Acids for the Decomposition of Chlorfenvinphos under the Influence of Visible Light: Activity, Performance, Adsorption, and Kinetics

Bioinspired ZnO-Based Solar Photocatalysts for the Efficient Decontamination of Persistent Organic Pollutants and Hexavalent Chromium in Wastewater

Photocatalytic activity of biosynthesized CeO2 nano particles

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