Effect of morphology and pH on (photo)electrochemical degradation of methyl orange using TiO 2 /Ti mesh photocathode under visible light

Islam, Md. Merajul; Basu, Suddhasatwa

doi:10.1016/j.jece.2015.08.026

Cited by 24 publications

(5 citation statements)

References 41 publications

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“…The forms of TiO 2 depend on the arrangement of titanium and oxygen atoms in the crystal lattice. Therefore, it has been reported that the solvent, precursor type, particle size, calcination temperature, pH, additives, and stirring time affect solgel-synthesized TiO 2 nanoparticle phases (Agarthan et al 2013;Islam and Basu 2015). It has been reported that the particle sizes of the synthesized nanoparticles increase as their surface areas increase (Chen et al 2014b;Pavel and Radovan 2015).…”

Section: Factors Affecting Tio 2 Nanoparticlesmentioning

confidence: 99%

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

et al. 2020

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Increase in industrial and anthropogenic activities leads to a decline in water quality. This necessitates the need for the removal of contaminants from industrial and domestic wastewater. Clay minerals are naturally abundant and non-toxic materials that found to be useful for remediation of emerging contaminants from wastewater. This review paper presents an insight into clay, the simplest material (in solgel techniques) for the synthesis of TiO 2 and ZnO, mechanisms of their reactions, analytical techniques used for characterizations, and their nanocomposites for wastewater treatment. Nanomaterials, such as nanoclay, titanium, and zinc oxide, have offered the opportunities of sequestering variety of pollutants in wastewater. TiO 2 and ZnO anchored on clay have been found to be good promising sequesters and have been explored for wastewater remediation via nanotechnology. This water treatment method includes adsorption/absorption, photocatalysis, and microbial disinfection. These nanocomposites provide more active surface sites and reduce the agglomeration of the nanoparticles, but leaching has been their shortcomings. To overcome this, the filtration technique may become significant for the removal and avoidance of fouling of wastewater. This can be achieved through the fabrication of nano-based filters using the nanocomposites.

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Section: Factors Affecting Tio 2 Nanoparticlesmentioning

confidence: 99%

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

et al. 2020

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“…Among these, the sol–gel synthesis is a promising method for the preparation of nanocrystalline materials because of the mild experimental conditions, simple preparation process and lower cost [ 14 , 15 ]. The solvent, precursor type, solution pH, additives and calcinations temperatures affect the sol-gel synthesized powders [ 16 , 17 , 18 ]. The pH of a medium significantly affects crystal structure and surface morphology of TiO 2 nanostructures [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of acidic pH on the formulation of TiO 2 nanocrystalline powders with enhanced photoluminescence property

Tsega

Dejene

2017

Heliyon

104

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Titanium dioxide (TiO2) nanoparticles were prepared by the sol-gel method at different pH values (3.2–6.8) with a hydrochloric acid (HCl) solution. Raw samples were calcined at 500 °C for 2 h. The effects of pH on the structural, morphological and optical properties of TiO2 nanoparticles were investigated. At pH 4.4–6.8, only the anatase phase of TiO2 was observed. Under strong acidic condition at pH 3.2 rutile, brookite and anatase co-exist, but rutile is the predominant phase. The strain value increased and the crystallite size decreased as the HCl content increased. The increased crystallite sizes in the range 21–24 nm and enhanced blue emission intensity around 432 nm was obtained for the sample at pH 5.0. Experimental results showed that TiO2 nanoparticles synthesized at pH 5.0 exhibited the best luminescence property with pure anatase phase.

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“…Changes in the pH values can affect the photocatalytic degradation rates of HAs because the initial pH value influences the zero-point charge (ZPC) of TiO 2 . The pH ZPC for TiO 2 is widely reported between 6 and 7 [22]. Because the doping amount of metal ions was extremely low, the pH ZPC for Fe-Zn co-doped TiO 2 was detected to be about 6, similar with that for the pure TiO 2 .…”

Section: Initial Solution Ph Valuementioning

confidence: 66%

Enhanced photocatalytic oxidation of humic acids using Fe3+-Zn2+ co-doped TiO2: The effects of ions in aqueous solutions

Yuan

Liú

Wang

et al. 2017

Environmental Engineering Research

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Photocatalytic oxidation in the presence of Fe-doped, Zn-doped or Fe-Zn co-doped TiO2 was used to effectively decompose humic acids (HAs) in water. The highest HAs removal efficiency (65.7%) was achieved in the presence of 500°C calcined 0.0010% Fe-Zn co-doped TiO2 with the Fe:Zn ratio of 3:2. The initial solution pH value, inorganic cations and anions also affected the catalyst photocatalytic ability. The HAs removal for the initial pH of 2 was the highest, and for the pH of 6 was the lowest. The photocatalytic oxidation of HAs was enhanced with the increase of the Ca 2+ or Mg 2+ concentration, and reduced when concentrations of some anions increased. The inhibition order of the anions on TiO2 photocatalytic activities was CO3 2-> HCO3-> Cl-, but a slightly promotion was achieved when SO4 2was added. Total organic carbon (TOC) removal was used to evaluate the actual HAs mineralization degree caused by the 500°C calcined 0.0010% Fe-Zn (3:2) co-doped TiO2. For tap water added with HAs, the UV254 and TOC removal rates were 57.2% and 49.9%, respectively. The UV254 removal efficiency was higher than that of TOC because of the generation of intermediates that could significantly reduce the UV254, but not the TOC.

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Effect of morphology and pH on (photo)electrochemical degradation of methyl orange using TiO 2 /Ti mesh photocathode under visible light

Cited by 24 publications

References 41 publications

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

Application of TiO2 and ZnO nanoparticles immobilized on clay in wastewater treatment: a review

Influence of acidic pH on the formulation of TiO 2 nanocrystalline powders with enhanced photoluminescence property

Enhanced photocatalytic oxidation of humic acids using Fe3+-Zn2+ co-doped TiO2: The effects of ions in aqueous solutions

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