Adsorption and photo-Fenton catalytic degradation of organic dyes over crystalline LaFeO<sub>3</sub>-doped porous silica

Phan, Thi To Nga; Nikoloski, Aleksandar N.; Bahri, Parisa A.; Li, Dan

doi:10.1039/c8ra07073c

Cited by 42 publications

(7 citation statements)

References 69 publications

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“…As can be seen clearly from the low angle XRD, SBA-15 showed a strong characteristic peak at 2θ � 1°and two small diffraction peaks at 2θ � 1.7 and 1.9°t hat could be assignable to the (100), (110), and (200) plane of SBA-15 [36], confirming the success in the synthesis of hard template SBA-15. As expected, in the wide-angle XRD pattern of the LFO-RHT, several characteristic peaks appeared at 2θ of 22.6, 32.2, 39.6, 46.3, 52.0, 57.4, 67.4, 72.0, and 76.7°, which are identical to those in the XRD pattern of our synthesized LFO [37]. e sample LFO-RHT exhibited the characteristic diffraction peaks indexable to the orthorhombic structure of LFO (JCPDS no.…”

Section: Materials Characterizationsupporting

confidence: 87%

Mesoporous LaFeO3: Synergistic Effect of Adsorption and Visible Light Photo-Fenton Processes for Phenol Removal from Refinery Wastewater

Phan

Nguyen

et al. 2021

Journal of Chemistry

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Mesoporous LaFeO3 as a visible light-driven photocatalyst was prepared by a nanocasting method using mesoporous silica (SBA-15) as a hard template. The as-prepared LaFeO3 photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), and optical absorption spectra. The characterization studies and experimental results showed that LaFeO3 with porous structure caused by the removal of SBA-15 hard template could enhance the specific surface area of the resulting photocatalyst, which improves the phenol adsorption ability of the photocatalyst and in turn enhances its photo-Fenton catalytic activity. The photo-Fenton catalytic activity of the photocatalyst was investigated by photo-Fenton degradation of aqueous phenol under visible light irradiation. The effects of catalyst dosage, H2O2 concentration, and solution pH on the photo-Fenton catalytic degradation of phenol using mesoporous LaFeO3 were studied and optimized. Under the optimal conditions of 20 mg L−1 phenol, 1.0 g L−1 catalyst, and 10 mM H2O2 at pH = 5, the photo-Fenton degradation of phenol (93.47%) was achieved in 180 min under visible light irradiation. Furthermore, our results proved the stability and reusability of mesoporous LaFeO3 and revealed its catalytic mechanism for the photo-Fenton degradation of phenol.

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Section: Materials Characterizationsupporting

confidence: 87%

Mesoporous LaFeO3: Synergistic Effect of Adsorption and Visible Light Photo-Fenton Processes for Phenol Removal from Refinery Wastewater

Phan

Nguyen

et al. 2021

Journal of Chemistry

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“…This was because with the increase in the amount of catalyst, the surface area and active sites, responsible for the acceleration of H 2 O 2 decomposition, also increased. However, with the further increment in the amount of catalyst, agglomeration of catalyst particles and excessive iron accumulation removed · OH, which inhibited the increment of the removal efficiency of MB ( Phan et al, 2018 ; Qin et al, 2018 ; Xiao et al, 2018 ). When the amount of catalyst was varied within 1.00–1.50 g L −1 , no significant effect on the final removal rate of MB was observed.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Heterogeneous Fenton Degradation of Organic Pollutants by CRC/Fe3O4 Catalyst at Neutral pH

et al. 2022

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Fe3O4-based heterogeneous Fenton catalysts have been widely employed for degrading organic pollutants, however it is challenging to use them in highly efficient and recyclable application in wastewater treatment. In this work, carboxylate-rich carbon (CRC)-modified Fe3O4 magnetic particles are prepared by the sol-gel self-combustion method, where CRC is obtained from the carbonization of sodium gluconate. The CRC/Fe3O4 catalyst exhibits high heterogeneous Fenton degradation performance. The complete 10 mg L−1 methylene blue (MB) removal is achieved in 180 min under conditions of 10 mM H2O2 and 1.00 g of L−1 CRC/Fe3O4 at neutral pH. After five cycles, the structure and morphology of CRC/Fe3O4 composites remained unchanged and the catalytic activity also remained unaltered. Moreover, phenol, benzoic acid (BA), sulfamethazine (SMT), and tetracycline (TC) were also degraded in the heterogeneous Fenton reaction using CRC/Fe3O4 as a catalyst. The strong coordinating ability of –COOH/ –COO– functionalities of CRC formed strong bonds with Fe(II/III) ions on the surfaces of Fe3O4 particles, which was conducive to adsorption of organic matter on the surface of the catalyst and promoted the occurrence of heterogeneous Fenton reactions. It was found that CRC/Fe3O4 had higher removal rates for the adsorptive exclusions of pollutants, such as TC and MB, whereas there were lower removal rates for phenol, BA, and SMT. This work brings potential insights for development of a novel adsorption-enhanced heterogeneous Fenton reaction for wastewater treatment.

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“…The highest photocatalytic activity toward CA elimination at 75% of ATO in ATO/SBA catalysts might relate to high dispersion between ATO and SBA to form more active sites. The decrease of CA degradation efficiency at higher 75% ATO loadings was due to the decrease in pores which absorb CA from solution (Li et al, 2016;Phan et al, 2018). According to the obtained results, 75ATO/SBA catalyst was chosen as the optimum materials in the present study.…”

Section: Fig 2: Xrd Pattern Of Ato/sba Catalystsmentioning

confidence: 94%

Al2TiO5/SBA-15 promoting photocatalytic degradation of cinnamic acid

Trung¹,

Nhuan²,

Do³

et al. 2020

CTU Journal

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The synthesis of Al 2 TiO 5 /SBA-15 (ATO/SBA) catalysts was investigated by the sol-gel method using precursors including aluminum nitrate, titanium isopropoxide, SBA-15, and citric acid. The formation of ATO/SBA phases was analyzed by X-ray diffraction (XRD). The content of ATO in ATO/SBA catalysts strongly affected the photocatalytic degradation of cinnamic acid (CA). The obtained results showed that 75% ATO in ATO/SBA (75ATO/SBA ) phases led to the highest efficiency of CA photodegradation. The characteristics of 75ATO/SBA sample were determined by Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller adsorption, UV-Vis diffuse reflectance spectroscopy, and transmission electron microscopy. Moreover, the activity of 75ATO/SBA on photocatalytic degradation of CA was also investigated by catalyst dosage, initial pH of CA solution, and airflow rate. The optimum condition for photodegradation efficiency of CA was found to be at C cat = 0.75 g/L, pH = 3.8, Q air = 0.3 L/min and t react = 6 hrs.

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Adsorption and photo-Fenton catalytic degradation of organic dyes over crystalline LaFeO₃-doped porous silica

Abstract: LFO-doped mesoporous silica yielded high removal rate of dye, due to the dark adsorption and visible light-induced photo-Fenton degradation.

Cited by 42 publications

References 69 publications

Mesoporous LaFeO3: Synergistic Effect of Adsorption and Visible Light Photo-Fenton Processes for Phenol Removal from Refinery Wastewater

Mesoporous LaFeO3: Synergistic Effect of Adsorption and Visible Light Photo-Fenton Processes for Phenol Removal from Refinery Wastewater

Enhanced Heterogeneous Fenton Degradation of Organic Pollutants by CRC/Fe3O4 Catalyst at Neutral pH

Al2TiO5/SBA-15 promoting photocatalytic degradation of cinnamic acid

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Adsorption and photo-Fenton catalytic degradation of organic dyes over crystalline LaFeO3-doped porous silica

Abstract: LFO-doped mesoporous silica yielded high removal rate of dye, due to the dark adsorption and visible light-induced photo-Fenton degradation.

Cited by 42 publications

References 69 publications

Mesoporous LaFeO3: Synergistic Effect of Adsorption and Visible Light Photo-Fenton Processes for Phenol Removal from Refinery Wastewater

Mesoporous LaFeO3: Synergistic Effect of Adsorption and Visible Light Photo-Fenton Processes for Phenol Removal from Refinery Wastewater

Enhanced Heterogeneous Fenton Degradation of Organic Pollutants by CRC/Fe3O4 Catalyst at Neutral pH

Al2TiO5/SBA-15 promoting photocatalytic degradation of cinnamic acid

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Adsorption and photo-Fenton catalytic degradation of organic dyes over crystalline LaFeO₃-doped porous silica