Synthesis of superacid sulfated TiO2 prepared by sol-gel method and its use as a titania precursor in obtaining a kaolinite/TiO2 nano-hybrid composite

Oliveira, Carlos Rafael Silva de; Batistella, Mateus; Souza, Antônio Augusto Ulson de; Souza, Selene de Arruda Guelli Ulson de Maria

doi:10.1016/j.powtec.2020.11.063

Cited by 31 publications

(11 citation statements)

References 90 publications

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“…The particle size of TC is the highest compared to 5SA, 10SA, 15SA, and 20SA with 80 nm, 64 nm, 67 nm, 36 nm, and 44 nm, respectively. Increasing the sulphate concentration decreases the particle size and aligns with results from Oliveira et al [51]. The TGA-DTG curve of non-sulphated (TC) and sulphated-titania catalyst (5SA, 10SA, 15SA, and 20SA) was shown in Figure 4.…”

Section: Physicochemical Properties Of the Synthesized Catalystsupporting

confidence: 86%

Assessment on the Effect of Sulfuric Acid Concentration on Physicochemical Properties of Sulfated-Titania Catalyst and Glycerol Acetylation Performance

et al. 2021

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In this research, a solid acid catalyst was synthesized to catalyse glycerol acetylation into acetins. The sulphated-titania catalysts were prepared via the wet impregnation method at different sulfuric acid concentrations (5%, 10%, 15%, and 20%) and denoted as 5SA, 10SA, 15SA, and 20SA, respectively. The synthesized catalysts were characterized using FTIR, XRD, TGA, BET, NH3-TPD, XRF, and SEM-EDX. The synthesized catalysts were tested on glycerol acetylation reaction at conditions: 0.5 g catalyst loading, 100–120 °C temperature, 1:6 glycerol/acetic acid molar ratios, and 2–4 h reaction time. The final product obtained was analysed using GC-FID. An increment in sulfuric acid concentration reduces the surface area, pore volume, and particles size. However, the increment has increased the number of active sites (Lewis acid) and strong acid strength. 15SA catalyst exhibited excellent glycerol conversion (>90%) and the highest selectivity of triacetin (42%). Besides sufficient surface area (1.9 m2 g−1) and good porosity structure, the great performance of the 15SA catalyst was attributed to its high acid site density (342.6 µmol g−1) and the high active site of metal oxide (95%).

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Section: Physicochemical Properties Of the Synthesized Catalystsupporting

confidence: 86%

Assessment on the Effect of Sulfuric Acid Concentration on Physicochemical Properties of Sulfated-Titania Catalyst and Glycerol Acetylation Performance

et al. 2021

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“…82 The sol-gel method has been widely adopted for preparing ash-and clay mineralsbased metal oxide composites. [83][84][85][86][87][88] For example, TiO 2 loaded y ash (FA) catalysts were obtained by adding titanium tetraisopropoxide to acetic acid under continuous stirring for 120 min at 50 C, and then mixing with an aqueous suspension of the FA before drying process and calcination at 500 C. 89 Similarly, Zn-doped TiO 2 /C@SiO 2 nanoporous with rice husk (RH) as a template was prepared by the addition of Zn-RHA to titania sols and impregnation for 24 h, followed by drying in at 100 C for another 24 h. 90…”

Section: Sol-gel Immobilizationmentioning

confidence: 99%

Fly ash-, foundry sand-, clay-, and pumice-based metal oxide nanocomposites as green photocatalysts

2021

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“…The individual separated flakes of these nanoplatelets exhibited subhedral to anhedral edges with pitted surfaces (doped with titanium nanocrystals) and sub‐equant to sub‐elongate shapes (Figure 6a). The EDX map (Figure 6b and c) of the TiO 2 ‐QDs‐Kao nanocomposite particles showed that the titanium metal was doped as quantum dots (< 5 nm) which were distributed homogeneously within the basal and edge surfaces of kaolinite nanoplatelets (matrix) 43,44 . The EDX analysis indicated that the contents of Al, Si, O and Ti were 17.82, 19.76, 47.48 and 14.96 wt%, respectively (Figure 6d), on the pyrofabricated TiO 2 ‐QDs‐Kao nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

“…The EDX map (Figure 6b and c) of the TiO 2 -QDs-Kao nanocomposite particles showed that the titanium metal was doped as quantum dots (< 5 nm) which were distributed homogeneously within the basal and edge surfaces of kaolinite nanoplatelets (matrix). 43,44 The EDX analysis indicated that the contents of Al, Si, O and Ti were 17.82, 19.76, 47.48 and 14.96 wt%, respectively (Figure 6d), on the pyrofabricated TiO 2 -QDs-Kao nanocomposite.…”

Section: Micromorphology and Microtexture (Sem-edx And Tem)mentioning

confidence: 99%

Photocatalytic degradation of Rhodamine B dye using low‐cost pyrofabricated titanium dioxide quantum dots‐kaolinite nanocomposite

Awad

Farrag

El-Bindary

et al. 2023

Applied Organom Chemis

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In this study, we report a simple technique for the pyrofabrication of a novel photocatalyst of titanium dioxide quantum dots-kaolinite nanocomposite (TiO 2 -QDs-Kao) used for rhodamine B (RhB) dye degradation. The photocatalyst was characterized by using different analytical techniques, including XRD, XRF, XPS, FTIR, DTA/TGA, SEM-EDX, TEM, BET, BJH, ZP and UV-Vis DRS. The photocatalytic degradation of RhB was performed in aqueous solutions using the sustainable sunlight energy under atmospheric conditions and fixed neutral medium (pH = 7). The produced photocatalyst exhibited optical band gap energy of 2.85 eV, an improved large specific surface area of 107.724 m 2 /g with pore radius of 1.45 nm and total pore volume of 0.123 cm 3 /g.The study indicated a maximum 91% degradation efficiency of RhB after 120 min using the optimum dose 1,400 mg/l of the TiO 2 -QDs-Kao photocatalyst. The degradation of RhB dye fitted the Langmuir first-order kinetics with rate constant 0.0151 min À1 . The radical trapping experiments based on scavengers confirmed that the mechanism of photocatalytic degradation activity was potentially based on electron (e À ) and hole (h + ) conduction band. The potential energy of the valence and conduction bands E VB and E CB were calculated 2.73 and À0.12 eV, respectively. A triple reusability study confirmed a high stability of TiO 2 -QDs-Kao photocatalyst with detected degradation efficiencies of 91.0, 89.9, 88.8 and 87.5%, respectively.

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Synthesis of superacid sulfated TiO2 prepared by sol-gel method and its use as a titania precursor in obtaining a kaolinite/TiO2 nano-hybrid composite

Cited by 31 publications

References 90 publications

Assessment on the Effect of Sulfuric Acid Concentration on Physicochemical Properties of Sulfated-Titania Catalyst and Glycerol Acetylation Performance

Assessment on the Effect of Sulfuric Acid Concentration on Physicochemical Properties of Sulfated-Titania Catalyst and Glycerol Acetylation Performance

Fly ash-, foundry sand-, clay-, and pumice-based metal oxide nanocomposites as green photocatalysts

Photocatalytic degradation of Rhodamine B dye using low‐cost pyrofabricated titanium dioxide quantum dots‐kaolinite nanocomposite

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