Synthesis of Hydroxide–TiO2 Compounds with Photocatalytic Activity for Degradation of Phenol

Contreras-Ruiz, J. C.; Martínez-Gallegos, Sonia; Ordóñez, Eduardo Javier Moguel; González-Juárez, J. C.; García-Rivas, José Luis

doi:10.1007/s11664-016-5209-7

Cited by 9 publications

(7 citation statements)

References 23 publications

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“…As [41], typical of layered materials like LDH [28]. The isotherms are used to calculate the textural parameters of the materials (BET surface area, total pore volume, and average pore diameter), which are also shown in Table. The results for the synthesized TiO 2 /LDH materials show smaller surface areas than those reported for LDH-type materials [20], falling into the range of 45.29-49.34 m 2 /g. This is attributed to the contribution of the photocatalyst TiO 2 , which has smaller surface areas, the reduction in pore volume due to heat treatment, and the presence of Fe and Zn oxides in the materials, which have smaller surface areas compared to LDH.…”

Section: Bet Analysiscontrasting

confidence: 53%

“…A suitable material for immobilizing TiO 2 particles is the anionic clay family known as layered double hydroxides (LDH). LDH are porous materials with a large surface area and good adsorption capacity for organic pollutants and many surface hydroxyl groups, as well as being excellent dispersants and carriers for TiO 2 particles to produce materials with photocatalytic properties in the phenol removal [16][17][18][19][20]. LDH structure is described based on the distribution of magnesium hydroxide Mg(OH) 2 , where the base units are sheets with Mg 2+ cations located in the center, in octahedral coordination by OH − groups.…”

Section: Introductionmentioning

confidence: 99%

“…The properties of LDH can be adjusted by changing the divalent and trivalent cations, which affects their physico-chemical properties [23]. Among the most important properties that make hydrotalcite an attractive material in many fields of application are anion exchange and the reconstruction of the calcined materials; these characteristics allow hydrotalcite to act as an adsorbent of anionic organic pollutants by ion exchange or as adsorbents of organic pollutants that would occupy the interlayer space [18,20,21].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Textural Parameters of LDH-TiO₂ Composites on Phenol Adsorption and Photodegradation Capacities

Contreras-Ruiz

Martínez-Gallegos

García-Rivas

et al. 2019

International Journal of Photoenergy

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Layered double hydroxides (LDH) M2+M3+CO32− were synthesized following the sol-gel methodology using Mg-Al, Mg-Fe, and Zn-Al as cation pairs for subsequent use in the preparation of TiO2/LDH materials. The samples were characterized by infrared spectroscopy (IR), scanning electron microscopy (SEM), and the Brunauer–Emmett–Teller (BET) technique to determine the surface area (SA); the results of which were used to determine the roughness of the samples in terms of surface fractal dimension (D). The prepared materials exhibited both adsorption and photocatalytic properties in the removal of phenol in aqueous solution under ultraviolet irradiation. This work studies the relationship between the textural parameters of the materials obtained in relation to their photocatalytic efficiency and adsorption capacity, finding that the surface of the solids, their structural heterogeneity, and roughness condition the photodegradation and adsorption processes, using phenol as reference organic pollutant. The results show that different cation in LDH influences in photocatalytic capacity; the TiO2/ZnAl was the best material in one test, but after 10 times of test, the TiO2/MgFe gave the better photodegradation material. In adsorption capacity, TiO2/ZnAl and TiO2/MgFe have a close rate for phenol adsorption and both were better than TiO2/MgAl. The differences in textural characteristics (surface area, surface roughness, and pore-size distribution) affected phenol adsorption and photodegradation efficiency.

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Section: Bet Analysiscontrasting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the Textural Parameters of LDH-TiO₂ Composites on Phenol Adsorption and Photodegradation Capacities

Contreras-Ruiz

Martínez-Gallegos

García-Rivas

et al. 2019

International Journal of Photoenergy

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“…As previously reported, in the preparation of HDL-TiO 2 composites [15], the use of anionic clays synthesized by the sol-gel method has advantages over those prepared by the conventional coprecipitation method, because the sol-gel HDL possesses smaller crystal size, which offers a bigger dispersion of TiO 2 particles on the surface of material minimizing the photocatalyst screening phenomenon. In this work according to previous tests, three methodologies were chosen in the preparation of composites derived from TiO 2 and sol-gel HDL based on their photocatalytic efficiency, which are representative for the three different synthesized photocatalysts:…”

Section: Synthesis Of Tio 2 -Ldh Compositesmentioning

confidence: 94%

“…Two groups of synthesis methods were used: the first one is to obtain the TiO 2 photocatalyst, and the second one is in the preparation of the TiO 2 -LDH composites. The LDH was prepared by the sol-gel method, according to previously optimized procedures [14,15] in relation to its photoactivity evaluated with the degradation of phenol. The synthesized composites in this work were also tested for phenol photodegradation in aqueous solution.…”

Section: −mentioning

confidence: 99%

Influence of the Synthesis Method on the Preparation Composites Derived from TiO2-LDH for Phenol Photodegradation

Contreras-Ruiz¹,

Martínez-Gallegos²,

Rivas³

et al. 2018

Titanium Dioxide - Material for a Sustainable Environment

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Three different TiO 2 catalysts are prepared using different methods. MgAl-CO 3 2− layered double hydroxides (LDH) were obtained by the sol-gel method. In the preparation of the composites, the three photocatalysts were combined with LDH following different methodologies. The composites were characterized using X-ray diffraction (XRD), specific surface area (SA), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The influence of the synthesis method on the preparation of the composites was evaluated by analyzing their photocatalytic activity against phenol as a model organic pollutant under UV irradiation. The photocatalytic activity of the composites improves when the chemical interaction, determined by XPS, between the TiO 2 and the LDH decreases. The same happens when the ratio of the anatase-rutile phases, determined by XRD, approaches optimum (80:20%). The effect of the composite concentration in the solution (0.5-2.0 g/L) was investigated, and the light-shielding phenomenon due to high composite concentration decreases the phenol photodegradation. The reduction of photocatalytic activity in reuse cycles is due to loss and partial deactivation of the material. The elimination of phenol is attributed primarily to the photocatalytic process due to the generation of • OH radicals and to a lesser extent the adsorption process also present in the samples.

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Enhanced photocatalytic activity of hydrozincite-TiO2 nanocomposite by copper for removal of pharmaceutical pollutant mefenamic acid in aqueous solution

Mersly

Mouchtari

Moujahid

et al. 2022

Environ Sci Pollut Res

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Nanocomposites based on Hydrozincite-TiO 2 and copper-doped HZ-xCu-TiO 2 (x= 0.1; 0.25; 0.35) were synthesized in a single step using the urea method. The samples were characterized by XRD, FTIR, SEM/TEM and DRS. The study of adsorption capacity and photocatalytic efficiency of these nanocomposites have been tested on a pharmaceutical pollutant, mefenamic acid (MFA).Kinetic study of removal of MFA, indicates that this pollutant was adsorbed on the surface of the synthesized phases, according to Langmuir's model. Such adsorption proved to be well adapted in a kinetic pseudo-second order model with capacity of 13.08 mg/g for HZ-0.25Cu-TiO 2 . Subsequently, the kinetics of photocatalytic degradation under UV-visible irradiation was studied according to several parameters, which allowed us to optimize our experimental conditions.The nanocomposite HZ-0.25Cu-TiO 2 showed significant removal efficiency of MFA. Elimination rate reached 100% after 20 min under UV-vis irradiation, and 77% after 7h under visible light irradiation. Repeatability tests have shown that this nanocomposite is extremely stable after six photocatalytic cycles. By-products of MFA were detected by LC/MS. These photoproducts produced by three types of reactions of hydroxylation; cyclization and cleavage of the aromatic ring. MFA underwent complete mineralization after 22 h of irradiation in the presence of the HZ-0.25Cu-TiO 2 .

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Synthesis of Hydroxide–TiO2 Compounds with Photocatalytic Activity for Degradation of Phenol

Cited by 9 publications

References 23 publications

Influence of the Textural Parameters of LDH-TiO₂ Composites on Phenol Adsorption and Photodegradation Capacities

Influence of the Textural Parameters of LDH-TiO₂ Composites on Phenol Adsorption and Photodegradation Capacities

Influence of the Synthesis Method on the Preparation Composites Derived from TiO2-LDH for Phenol Photodegradation

Enhanced photocatalytic activity of hydrozincite-TiO2 nanocomposite by copper for removal of pharmaceutical pollutant mefenamic acid in aqueous solution

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Synthesis of Hydroxide–TiO2 Compounds with Photocatalytic Activity for Degradation of Phenol

Cited by 9 publications

References 23 publications

Influence of the Textural Parameters of LDH-TiO2 Composites on Phenol Adsorption and Photodegradation Capacities

Influence of the Textural Parameters of LDH-TiO2 Composites on Phenol Adsorption and Photodegradation Capacities

Influence of the Synthesis Method on the Preparation Composites Derived from TiO2-LDH for Phenol Photodegradation

Enhanced photocatalytic activity of hydrozincite-TiO2 nanocomposite by copper for removal of pharmaceutical pollutant mefenamic acid in aqueous solution

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Influence of the Textural Parameters of LDH-TiO₂ Composites on Phenol Adsorption and Photodegradation Capacities

Influence of the Textural Parameters of LDH-TiO₂ Composites on Phenol Adsorption and Photodegradation Capacities