A novel Ga(III) coordination complex as an efficient sensitizer for enhancing photocatalytic activity of TiO2/rGO nanocomposite

Khavar, Amir Hossein Cheshme; Khedri, Neda; Rizo, Rubén; Martínez, Juan Miguel Feliu; Mahjoub, Ali Reza; Doolabi, Masoumeh; Aghayani, Ehsan

doi:10.1016/j.jre.2022.05.015

Cited by 11 publications

(3 citation statements)

References 40 publications

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“…Figure 3a depicts the morphological images of a part of crude GO agglomerated into a two-dimensional multilayered structure, illustrating silk veil waves, and a typical laminar and ultrathin wrinkled and crumpled structure alongside sharp edges as well as face-to-face stacking of sheets. 47,52,66,67 The micrographs of the GO/RCMP nanohybrid are presented in Figure 3b. As evidenced, the layered structure remained after loading of RCMP onto the GO nanoplatelets but with an amended, less aggregating, more flexible, and less wrinkled structure.…”

Section: Characterization Of the As-prepared Productsmentioning

confidence: 99%

Selectivity-Enhanced Electroreduction of CO₂ to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Khedri,

Mahjoub,

Cheshme Khavar

et al. 2024

Inorg. Chem.

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Recently, global-scale efforts have been conducted for the electroreduction of CO2 as a potentially beneficial pathway for the conversion of greenhouse gases to useful chemicals and renewable fuels. This study focuses on the development of selective and sustainable electrocatalysts for the reduction of aqueous CO2 to CO. A RuIIcomplex [Ru(tptz)(ACN)Cl2] (RCMP) (tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine, ACN = acetonitrile) was prepared as a molecular electrocatalyst for the CO2 reduction reaction in an aqueous solution. Density functional theory-calculated frontier molecular orbitals suggested that the tptz ligand plays a key role in dictating the electrocatalytic reactions. The RCMP electrocatalyst was grafted onto the graphene oxide (GO) surface both noncovalently (GO/RCMP) and covalently (GO-RCMP). The field emission scanning electron microscopy and elemental distribution analyses revealed the homogeneous distribution of the complex onto the GO sheet. The photoluminescence spectra confirmed accelerated charge-transfer in both nanohybrids. Compared to the bare complex, the GO-RCMP and GO/RCMP nanohybrids showed enhanced electrocatalytic activity, achieving >95% and 90% Faradaic efficiencies for CO production at more positive onset potentials, respectively. The GO-RCMP nanohybrid demonstrated outstanding electrocatalytic activity with a current of ∼84 μA. The study offers a perspective on outer- and inner-sphere electron-transfer mechanisms for electrochemical energy conversion systems.

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Section: Characterization Of the As-prepared Productsmentioning

confidence: 99%

Selectivity-Enhanced Electroreduction of CO₂ to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Khedri,

Mahjoub,

Cheshme Khavar

et al. 2024

Inorg. Chem.

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“…[21] Additionally, the efficiency of eliminating cyanide from industrial water was improved by using a catalyzed ozonation process with magnesium oxide nanoparticles and persulfate. [22] Modifications to photocatalytic processes, such as the addition of Ga (III) ions to TiO2/rGO nanocomposite [23] and the synthesis of magnetically reusable steel slag/TiO 2 , have also shown high efficiency in degrading pharmaceutical and herbicide pollutants. [24] Moreover, various studies have demonstrated the effectiveness of UV/H 2 O 2 and O 3 /UV processes in degrading different types of dyes, including azo dyes and Acid Orange 7.…”

Section: Introductionmentioning

confidence: 99%

Optimization of a novel hybrid photo-ozonation peroxymonosulfate process for degradation of Acid Black ATT dye in aqueous environment

Majlesi,

Rahmati,

Alipour

et al. 2024

Preprint

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The current research aimed to simultaneously generate sulfate and hydroxyl radicals to break down Acid Black ATT dye. It was observed that using UV radiation and ozonation separately is insufficient for the complete decomposition of this dye compound. Based on the results, the UV/O3/PMS process is able to completely remove all dye concentrations under the optimum conditions (pH=10, O3=20 mg/min, PMS=0.4 mM L-1, and AB-ATT=20 mg/L) in 10 minutes, with significant removal of TOC and COD. For every 0.1 mM increase in PMS concentration, dye removal increased by 14 %. Hydroxyl and sulfate radicals were identified as the primary active species responsible for the degradation. The degradation followed first kinetic order, and hydroxylation and decarboxylation pathways were found to contribute significantly to the process. Therefore, the combined UV/O3/PMS process can be used as an environmentally friendly hybrid technology of advanced sulfate-based oxidation to remove recalcitrant contaminants from aqueous solutions.

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“…Recently, there have been ways to increase photocatalytic e ciency, which has signi cantly degraded environmental and pharmaceutical pollutants. For example, the synthesis of complex Ga ( ) and addition to TiO 2 /rGO nanocomposite have caused the destruction of pharmaceutical pollutants such as acetaminophen (ACT) [23]. And also, the synthesis of magnetically and reusable steel slag/TiO 2 has caused the elimination of bipyridylium herbicides pollutants such as paraquat for controlling the aquatic weed in agricultural water [24].…”

Section: Introductionmentioning

confidence: 99%

The evaluation of improved degradation of Acid Black ATT dye in aqueous solution by hybrid photo-ozonation peroxymonosulfate process

Majlesi,

Rahmati,

Alipour

et al. 2023

Preprint

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The present study was designed and conducted to simultaneously produce two sulfate and hydroxyl radicals for the decomposition of Acid Black ATT dye, which showed that UV radiation and ozonation alone cannot decompose and break down this dye compound completely. The UV/O3/PMS process is able to completely remove all dye concentrations from 10 to 30 mg / L in 10 minutes. Then, the effect of parameters such as contact time, pH, initial dye concentrations, different doses of persulfate, and ozone under ultraviolet radiation on dye removal was studied. Based on the results of this experiment, the optimal concentrations of variables include pH, ozone concentration, and persulfate concentration, and initial dye concentration includes 10, 20 mg /min, 0.4 mM L− 1, and 20 mg/ L, respectively. For every 0.1 mM increase in PMS concentration, the amount of dye removal increased by 14%. Based on the findings of this study, the combined UV/O3/PMS process can be concluded that the environmentally friendly hybrid technology of advanced sulfate-based oxidation removes contaminants resistant to aqueous media.

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A novel Ga(III) coordination complex as an efficient sensitizer for enhancing photocatalytic activity of TiO2/rGO nanocomposite

Cited by 11 publications

References 40 publications

Selectivity-Enhanced Electroreduction of CO₂ to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Selectivity-Enhanced Electroreduction of CO₂ to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Optimization of a novel hybrid photo-ozonation peroxymonosulfate process for degradation of Acid Black ATT dye in aqueous environment

The evaluation of improved degradation of Acid Black ATT dye in aqueous solution by hybrid photo-ozonation peroxymonosulfate process

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A novel Ga(III) coordination complex as an efficient sensitizer for enhancing photocatalytic activity of TiO2/rGO nanocomposite

Cited by 11 publications

References 40 publications

Selectivity-Enhanced Electroreduction of CO2 to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Selectivity-Enhanced Electroreduction of CO2 to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Optimization of a novel hybrid photo-ozonation peroxymonosulfate process for degradation of Acid Black ATT dye in aqueous environment

The evaluation of improved degradation of Acid Black ATT dye in aqueous solution by hybrid photo-ozonation peroxymonosulfate process

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Selectivity-Enhanced Electroreduction of CO₂ to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture

Selectivity-Enhanced Electroreduction of CO₂ to CO at Novel Ru-Linked-GO Nanohybrids: the Role of Nanoarchitecture