Ag/TiO2 photocatalyst immobilized onto modified natural fibers for photodegradation of anthracene

Lopes, Flávia Cavalcante S.M.R.; Rocha, Maria da Graça Carneiro da; Bargiela, Pascal; Ferreira, Hadma Sousa; Pires, Carlos Augusto de Moraes

doi:10.1016/j.ces.2020.115939

Cited by 53 publications

(17 citation statements)

References 59 publications

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“…Meanwhile, the two peaks around 3440 cm −1 and 1630 cm −1 observed in all samples were ascribed to the stretching vibration of hydroxyl groups (−OH) and adsorbed water molecules on the surface of samples, which was also reported in previous literature [ 40 ]. Both high intensity peaks at 3329 cm −1 and 1596 cm −1 found in cellulose indicated the presence of high density free hydroxyl groups and water molecules that adsorbed onto the cellulose after the removal of lignin and hemicellulose from the surface of the fibers [ 41 ]. The addition of cellulose and/or Ag into TiO 2 increased the peaks intensity, which was related to the water molecules adsorbed by the composite materials.…”

Section: Resultsmentioning

confidence: 99%

“…In the O1s spectrum shown in Figure 7 c, the two peaks formed at binding energies of 530.8 and 532.5 eV were associated with the lattice oxygen in TiO 2 (O–Ti–O bond) and chemisorbed water molecules or carbonyl groups from cellulose (Ti–O–H or Ti–O–C), respectively [ 41 , 59 ]. The surface adsorbed oxygen would react with the generated electrons to produce anion radicals.…”

Section: Resultsmentioning

confidence: 99%

“…The carbon peak occurred at 287.3 eV was associated with the O–C–O or C–OH bonds [ 71 , 72 ]. Another carbon peak formed at 289.8 eV was attributed to carbonyl, aldehydic, or ketonic carbon on the surface of cellulose/Ag/TiO 2 [ 41 ]. This peak at 289.8 eV was also associated with the carboxylic or carbonate groups generally present on the surface of the metal oxides [ 51 , 73 ].…”

Section: Resultsmentioning

confidence: 99%

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Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

et al. 2021

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In this study, a novel cellulose/Ag/TiO2 nanocomposite was successfully synthesized via the hydrothermal method. The cellulose extracted from oil palm empty fruit bunch (OPEFB) could address the disposal issue created by OPEFB biomass. Characterization studies such as FESEM, EDX, HRTEM, XRD, FTIR, UV–Vis DRS, PL, XPS, and surface analysis were conducted. It was observed that the incorporation of cellulose could hinder the agglomeration, reduce the band gap energy to 3 eV, increase the specific surface area to 150.22 m3/g, and lower the recombination rate of the generated electron-hole pairs compared to Ag/TiO2 nanoparticles. The excellent properties enhance the sonocatalytic degradation efficiency of 10 mg/L Congo red (up to 81.3% after 10 min ultrasonic irradiation) in the presence of 0.5 g/L cellulose/Ag/TiO2 at 24 kHz and 280 W. The improvement of catalytic activity was due to the surface plasmon resonance effect of Ag and numerous hydroxyl groups on cellulose that capture the holes, which delay the recombination rate of the charge carriers in TiO2. This study demonstrated an alternative approach in the development of an efficient sonocatalyst for the sonocatalytic degradation of Congo red.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

et al. 2021

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“…It was noted that the bands observed at~500-800 cm −1 were associated with the Ti O stretching vibrations. 6,33 Differences in the transmittance peaks of Ti O due to surface properties were detected. When the band peaks of Au containing catalysts were compared, it was seen that the Ti O transmittance peak intensity of 0.8 Au-Ce/TiO 2 catalyst was higher.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Keskin

2021

J of Chemical Tech & Biotech

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BACKGROUND: NO x emissions are very toxic and cause serious adverse environmental effects. NO x reduction technologies have been developed due to the harmful effects of NO x and increasingly stringent emission standards which apply in many countries. Selective catalytic reduction (SCR) is the most effective method of removing NO x from engine exhaust. The suitable active catalysts are important for providing higher NO x conversion efficiencies in the SCR system. Catalyst production methods affect catalytic activity due to change in elemental composition, morphology, dispersion of catalytic elements, and total surface area. In this study, de-NO x performance of Ce/TiO 2 and Au-Ce/TiO 2 catalysts were investigated with real exhaust gases. Tests were carried out within 200-300°C temperature range to evaluate low temperature performance of the catalysts. Cordierite material was used as the support material and pre-treated with hot acid solution to enhance surface area. Ce content of synthesized catalysts with impregnation method was adjusted as 4 wt% and Au content as 0.4, 0.8, and 1.6 wt%. The catalysts were characterized with Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), X-Ray Diffractometer (XRD), and Fourier transform infrared spectroscopy (FT-IR) analysis. RESULTS: Maximum NO x conversion ratios obtained at 300°C with the Ce/TiO 2 , 0.4 Au-Ce/TiO 2 , 0.8 Au-Ce/TiO 2 , and 1.6 Au-Ce/ TiO 2 catalysts were 95.1%, 92%, 92.6%, and 90.2%, respectively. CONCLUSIONS:The results showed that in general, de-NO x effect of the Ce/TiO 2 catalyst was greater than the Au doped Ce/TiO 2 catalysts. Au addition adversely affected surface properties of the catalyst and therefore activity of the Au-Ce/TiO 2 catalysts decreased.

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“…However, owing a to high specific surface-to-volume ratio, TiO2 NPs require immobilization on substrates for practical application [14,15]. There are studies where TiO2 NPs are practically immobilized on stainless steel mesh [16], glass slides [17], glass mesh [18], quartz substrate [19], concrete [20], coconut fibers [21], and Sr4Al14O25:Eu 2+ ,Dy 3+ phosphor beads [22]. One merit for immobilizing TiO2 is reusability and a less tedious recovery for the catalysts, even in slurry reactors.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ag-TiO2/Sr4Al14O25:Eu2+,Dy3+ Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics

2021

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Long-lasting Sr4Al14O25:Eu2+,Dy3+ phosphor beads were prepared with inorganic sodium silicate binders and coated to support Ag-doped TiO2 catalyst by the sol–gel coating method. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy confirmed that Ag and TiO2 were loaded on the bead surface. Photocatalytic degradation of toluene volatile organic compound was evaluated under ultraviolet and visible light through 410 nm filters. The photocatalyst/phosphor beads of Ag-TiO2/Sr4Al14O25:Eu2+,Dy3+ decorated with 0.035 M Ag in N2 and N2-H2 atmospheres exhibited higher photocatalytic efficiencies compared with beads heat treated in air. A low amount of Ag impregnation and the reducing atmosphere of N2/N2-H2 were beneficial for enhancing photocatalytic efficiency because Ag-doping in TiO2 imparted low energy levels for visible light sensitization. The synthesized powder-free beads possess compressive strength for possible applications, and easy recovery of the photocatalysts is beneficial for preventing any secondary pollution of nano-powders.

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Ag/TiO2 photocatalyst immobilized onto modified natural fibers for photodegradation of anthracene

Cited by 53 publications

References 59 publications

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Preparation of Ag-TiO2/Sr4Al14O25:Eu2+,Dy3+ Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics

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Ag/TiO2 photocatalyst immobilized onto modified natural fibers for photodegradation of anthracene

Cited by 53 publications

References 59 publications

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Role of Oil Palm Empty Fruit Bunch-Derived Cellulose in Improving the Sonocatalytic Activity of Silver-Doped Titanium Dioxide

Investigation of deactivation effect of Au addition to Ce/TiO2 catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions

Preparation of Ag-TiO2/Sr4Al14O25:Eu2+,Dy3+ Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics

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Investigation of deactivation effect of Au addition to Ce/TiO₂ catalyst for selective catalytic reduction using real diesel engine exhaust samples at low temperature conditions