Synthesis of hierarchically porous metal oxides and Au/TiO2 nanohybrids for photodegradation of organic dye and catalytic reduction of 4-nitrophenol

Li, Benxia; Hao, Yonggan; Shao, Xin; Tang, Haidi; Wang, Tao; Zhu, Jinbo; Yan, Shilong

doi:10.1016/j.jcat.2015.05.015

Cited by 101 publications

(28 citation statements)

References 54 publications

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“…The removal of dyes from wastewater has been extensively studied for decades, and many technologies have been developed, including oxidative degradation [5], biochemical degradation [6,7], photodegradation [8,9], electrocoagulation [10], electrochemical degradation [11], and adsorption [12,13]. Among these methods, adsorption has been found to be one of the most well-known and economic techniques for dye removal due to its easy operation, high efficiency, low cost, and recyclability [14].…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Tang

Dai

et al. 2017

Journal of Chemistry

109

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Walnut shell (WS), as an economic and environmental-friendly adsorbent, was utilized to remove methylene blue (MB) from aqueous solutions. The effects of WS particle size, solution pH, adsorbent dosage and contact time, and concentration of NaCl on MB removal were systematically investigated. Under the optimized conditions (i.e., contact time ∼ 2 h, pH ∼ 6, particle size ∼ 80 mesh, dye concentration 20 mg/L, and 1.25 g/L adsorbent), the removal percentages can achieve ∼97.1%, indicating WS was a promising absorbent to remove MB. Other supplementary experiments, such as Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and Brunauer-Emmett-Teller (BET) method, were also employed to understand the adsorption mechanisms. FTIR confirmed that the successful adsorption of MB on WS particles was through functional groups of WS. Using DLS method, the interactions between WS particles and dyes under various pH were investigated, which can be ascribed to the electrostatic forces. Kinetic data can be well fitted by the pseudo-second-order model, indicating a chemical adsorption. The adsorption isotherms were well described by both Langmuir and Freundlich models. Dubinin-Radushkevich model also showed that the adsorption process was a chemical adsorption. Thermodynamic data indicated that the adsorption was spontaneous, exothermic, and favorable at room temperature.

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Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Tang

Dai

et al. 2017

Journal of Chemistry

109

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“…The UV-Vis DR spectra of the catalysts prior to and after calcination are presented in Figure 4. In all cases, the characteristic sharp absorption threshold of TiO 2 around 350 nm was observed [25,26]. Furthermore, a broad signal around 546 nm was observed for the catalysts with gold.…”

Section: Samplementioning

confidence: 73%

Differences in the Catalytic Behavior of Au-Metalized TiO2 Systems During Phenol Photo-Degradation and CO Oxidation

et al. 2019

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For this present work, a series of Au-metallized TiO2 catalysts were synthesized and characterized in order to compare their performance in two different catalytic environments: the phenol degradation that occurs during the liquid phase and in the CO oxidation phase, which proceeds the gas phase. The obtained materials were analyzed by different techniques such as XRF, SBET, XRD, TEM, XPS, and UV-Vis DRS. Although the metallization was not totally efficient in all cases, the amount of noble metal loaded depended strongly on the deposition time. Furthermore, the differences in the amount of loaded gold were important factors influencing the physicochemical properties of the catalysts, and consequently, their performances in the studied reactors. The addition of gold represented a considerable increase in the phenol conversion when compared with that of the TiO2, despite the small amount of noble metal loaded. However, this was not the case in the CO oxidation reaction. Beyond the differences in the phase where the reaction occurred, the loss of catalytic activity during the CO oxidation reaction was directly related to the sintering of the gold nanoparticles.

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“…4b clearly revealed the crystalline nature of the titania shell with an interlayer distance of 0.352 nm which matches well with the lattice spacing corresponding to the (101) lattice planes of anatase TiO 2 . [38][39][40] The crystalline nature of the titania shell was also examined using XRD, as shown in Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of these peaks indicated that the titania is present in its anatase form. 38,40 Furthermore, the broadening of the diffraction peaks revealed that the titania crystallites were small in size. The average crystallite size of the calcined hollow mesoporous TiO 2 nanobers from corresponding XRD peaks were determined using the well-known Scherer equation: 41…”

Section: Resultsmentioning

confidence: 99%

Hollow Au@TiO₂ porous electrospun nanofibers for catalytic applications

et al. 2020

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Synthesis of hierarchically porous metal oxides and Au/TiO2 nanohybrids for photodegradation of organic dye and catalytic reduction of 4-nitrophenol

Cited by 101 publications

References 54 publications

Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Differences in the Catalytic Behavior of Au-Metalized TiO2 Systems During Phenol Photo-Degradation and CO Oxidation

Hollow Au@TiO₂ porous electrospun nanofibers for catalytic applications

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Synthesis of hierarchically porous metal oxides and Au/TiO2 nanohybrids for photodegradation of organic dye and catalytic reduction of 4-nitrophenol

Cited by 101 publications

References 54 publications

Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Removal of Methylene Blue from Aqueous Solution Using Agricultural Residue Walnut Shell: Equilibrium, Kinetic, and Thermodynamic Studies

Differences in the Catalytic Behavior of Au-Metalized TiO2 Systems During Phenol Photo-Degradation and CO Oxidation

Hollow Au@TiO2 porous electrospun nanofibers for catalytic applications

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Hollow Au@TiO₂ porous electrospun nanofibers for catalytic applications