Photocatalytic Phenol Degradation by Silica-Modified Titanium Dioxide

Eddy, Diana Rakhmawaty; Ishmah, Soraya Nur; Permana, Muhamad Diki; Firdaus, M. Lutfi; Rahayu, Iman; El‐Badry, Yaser A.; Hussein, Enas E.; El‐Bahy, Zeinhom M.

doi:10.3390/app11199033

Cited by 24 publications

(12 citation statements)

References 57 publications

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“…Meanwhile, the stretching vibration peak at 1618 cm -1 corresponds to the bending vibration of O-H groups [44]. The strong band at 1012 cm -1 indicates the vibration of the Ti-O-Ti or Ti-O bond [45].…”

Section: Resultsmentioning

confidence: 99%

Basic magnesium sulfate@TiO2 composite for efficient adsorption and photocatalytic degradation of 4-dodecylmorpholine in brine

Song,

Zhang,

et al. 2024

Preprint

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More than 70% of the potash fertilizer globally is produced by the froth flotation process, in which 4-dodecylmorpholine (DMP) serves as a reverse flotation agent. As the potash fertilizer production rapidly rises, the increased DMP levels in discharged brine pose a threat to the production of high-value chemicals. In this paper, composite particles of basic magnesium sulfate@TiO2 (BMS@TiO2) were prepared using a simple and mild loading method. These particles were utilized for the adsorption and photocatalytic degradation of DMP in brine. Compared with normal powdered materials, the granular BMS@TiO2 in this study can be easily separated from liquid, and the degradation intermediates will not enter the brine without causing secondary pollution. BMS@TiO2 consists of 5·1·7 phase (5Mg(OH)2·MgSO4·7H2O) whisker clusters embedding 2.3% TiO2. The adsorption equilibrium of DMP on BMS@TiO2 particles was achieved through electrostatic attraction and pore interception with the adsorption capacity of approximately 5 mg·g-1 after 6 hours. The photodegradation efficiency of DMP adsorbed on BMS@TiO2 reached about 92% within 16 hours, which is compared with that of pure TiO2 nanoparticles. Additionally, excellent stability and recyclability of BMS@TiO2 were also observed in five cycle tests of adsorption and photocatalytic degradation of DMP, and the possible photocatalytic degradation pathways and mechanism of DMP are proposed following molecular electrostatic potential analysis. This work provides a sustainable and environmentally friendly approach for eliminating organic micropollutants from water environments.

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Section: Resultsmentioning

confidence: 99%

Basic magnesium sulfate@TiO2 composite for efficient adsorption and photocatalytic degradation of 4-dodecylmorpholine in brine

Song,

Zhang,

et al. 2024

Preprint

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“…The TiO 2 /SiO 2 nanocomposites, possessing a 7:1 (TiO 2 :SiO 2 ) molar ratio, were produced base on the impregnation approach described by Eddy et al, 2021 [22] The chosen molar ratio was based on existing experimental results [22], indicating the enhanced photocatalytic activity of TiO 2 /SiO 2 nanocomposites with molar ratio equal to 7:1, with respect to other examined molar ratios (1:1 and 3:1). More specifically, 2.3263 g of TiO 2 powder was mixed with 80 mL of ethanol (C 2 H 5 OH, 99.8%, Sigma-Aldrich, Darmstadt, Germany) and sonicated for approximately 30 min.…”

Section: Synthesis Of Tio 2 /Sio 2 Composite Powdermentioning

confidence: 99%

“…Within the framework of the present research, TiO 2 and SiO 2 nanopowders were initially prepared utilizing a facile sol-gel approach and were further utilized to prepare a TiO 2 /SiO 2 composite material through a wet impregnation approach [22]. The physical aspects of the as-mentioned TiO 2 /SiO 2 composite material were thoroughly investigated using various techniques like FESEM, XRD, micro-Raman, FTIR, BET, DLS, as well as DRS.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of Rhodamine B and Phenol Using TiO2/SiO2 Composite Nanoparticles: A Comparative Study

Gatou,

Fiorentis,

Lagopati

et al. 2023

Water

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Organic pollutants found in industrial effluents contribute to significant environmental risks. Degradation of these pollutants, particularly through photocatalysis, is a promising strategy ensuring water purification and supporting wastewater treatment. Thus, photodegradation of rhodamine B and phenol under visible-light irradiation using TiO2/SiO2 composite nanoparticles was within the main scopes of this study. The nanocomposite was synthesized through a wet impregnation method using TiO2 and SiO2 nanopowders previously prepared via a facile sol–gel approach and was fully characterized. The obtained results indicated a pure anatase phase, coupled with increased crystallinity (85.22%) and a relative smaller crystallite size (1.82 nm) in relation to pure TiO2 and SiO2 and an enhanced specific surface area (50 m2/g) and a reduced energy band gap (3.18 eV). Photodegradation of rhodamine B upon visible-light irradiation was studied, showing that the TiO2/SiO2 composite reached total (100%) degradation within 210 min compared to pure TiO2 and SiO2 analogues, which achieved a ≈45% and ≈43% degradation rate, respectively. Similarly, the composite catalyst presented enhanced photocatalytic performance under the same irradiation conditions towards the degradation of phenol, leading to 43.19% degradation within 210 min and verifying the composite catalyst’s selectivity towards degradation of rhodamine B dye as well as its enhanced photocatalytic efficiency towards both organic compounds compared to pure TiO2 and SiO2. Additionally, based on the acquired experimental results, ●O2−, h+ and e− were found to be the major reactive oxygen species involved in rhodamine B’s photocatalytic degradation, while ●OH radicals were pivotal in the photodegradation of phenol under visible irradiation. Finally, after the TiO2/SiO2 composite catalyst was reused five times, it indicated negligible photodegradation efficiency decrease towards both organic compounds.

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“…The value of the polydispersity index (PI) is a measure of the distribution of the molecular mass in the sample. It is expressed as the average molecular weight of the weight divided by the sum of the average molecular weights [62]. The smallest PI value is in the sonochemical method which indicates that the particle size is evenly distributed and homogeneous.…”

Section: Particle Size Analysis (Psa)mentioning

confidence: 99%

The Effect of Different Synthesis with Chemical and Biological Methods on Properties of Silver Oxide Nanoparticles

et al. 2023

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Silver oxide (Ag2O) nanoparticles have been successfully synthesized through several methods, namely sol-gel, sonochemical, and biological methods. X-ray diffraction studies revealed that the sonochemical method produces silver oxide with high phase purity, then the sol-gel method produces another phase, namely silver crystals, while the biological method produces Ag3PO4 phase from the precursor media. The research showed that the sol-gel method had the smallest crystallite and particle sizes of 9.5 and 232.7 nm, respectively, compared to sonochemical and biological methods. It is known that the specific surface area of the sol-gel method has the largest value, namely 60.09 m2/g, compared to the sonochemical and biosynthetic methods, which are 51.78 and 24.77 m2/g, respectively. Scanning electron microscopy study showed homogeneous spherical nanoparticles of silver oxide in the sol-gel and sonochemical methods, however, the biological method resulted in the formation of non-spherical silver oxide nanoparticles in the form like flakes. HIGHLIGHTS Synthesis of silver oxide by chemical method produces pure silver oxide crystals, smaller crystallite size, larger specific area, and more homogeneous particle size than biological methods The sol-gel method for the synthesis of silver oxide produces the smallest particle size than the sonochemical and biological methods The sonochemical method produces the highest crystallinity and size homogeneity compared to the sol-gel and biological methods GRAPHICAL ABSTRACT

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Photocatalytic Phenol Degradation by Silica-Modified Titanium Dioxide

Cited by 24 publications

References 57 publications

Basic magnesium sulfate@TiO2 composite for efficient adsorption and photocatalytic degradation of 4-dodecylmorpholine in brine

Basic magnesium sulfate@TiO2 composite for efficient adsorption and photocatalytic degradation of 4-dodecylmorpholine in brine

Photodegradation of Rhodamine B and Phenol Using TiO2/SiO2 Composite Nanoparticles: A Comparative Study

The Effect of Different Synthesis with Chemical and Biological Methods on Properties of Silver Oxide Nanoparticles

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