scholarly journals Effect of thermal treatment on the catalytic activity of a Fe-rich bentonite for the photo-Fenton reaction

Cerâmica ◽  
2019 ◽  
Vol 65 (373) ◽  
pp. 147-152 ◽  
Author(s):  
B. M. Zimmermann ◽  
S. Silvestri ◽  
J. Leichtweis ◽  
G. L. Dotto ◽  
E. S. Mallmann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rhodamine B ◽  
Fenton Reaction ◽  
Dye Degradation ◽  
Mesoporous Structure ◽  
Iron Leaching ◽  
Visible Irradiation ◽  
Reaction Cycles ◽  
Adsorption Desorption ◽  
Thermally Treated

Abstract The objective of this work was to evaluate the degradation of rhodamine B dye from aqueous solution by photo-Fenton reaction under visible irradiation using a Fe-rich bentonite as a catalyst. The material was thermally treated at a low temperature (200 °C) and characterized by XRD, N2 adsorption-desorption isotherms, FTIR, SEM-EDS and XRF. Iron leaching in aqueous solution after the photo-Fenton reaction was evaluated by atomic absorption spectroscopy. The material exhibited a mesoporous structure, containing a specific surface area of 99 m2.g-1. The catalytic results showed significant dye degradation, reaching 95% of decolorization and 72% of mineralization at 300 min of reaction. The catalyst showed high chemical stability in four reaction cycles. Therefore, this thermally treated Fe-rich bentonite can be considered as a promising catalyst in the heterogeneous photo-Fenton reaction for the degradation of rhodamine B from aqueous solution.

Synthesis and Recycle of ZnO Particles for Degradation of Methyl Orange Aqueous Solution

2011 ◽  
Vol 121-126 ◽  
pp. 587-591 ◽  
Author(s):  
Li Qin Wang ◽  
Xiang Ni Yang ◽  
Xiu Li Zhao ◽  
Yang Han ◽  
Rui Jun Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Lamellar Structure ◽  
Degradation Rate ◽  
Mesoporous Structure ◽  
High Photocatalytic Activity ◽  
Type Iv ◽  
Zno Particles ◽  
Adsorption Desorption

The ZnO particles with mesoporous and lamellar structure were synthesized in the method of precipitation, using zinc acetate as precursor. The ZnO particles were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and N2 adsorption–desorption measurements. The photoactivity of as-prepared ZnO particles was evaluated by degradation experiment of methyl orange aqueous solution. The results showed the obtained ZnO particles were irregular polygons with lamellar structure, and the particle size was in the range of 50 nm to 300 nm. According to XRD and N2 absorption results, ZnO particles were pure and integrated crystals with high crystallinity, and adsorption-desorption isotherms correspond to the typical type IV isotherm with a hysteresis loop of type H3, which showed ZnO particles had mesoporous structure with slit pore shape. The ZnO particles had high photocatalytic activity, the maximum degradation rate of methyl orange aqueous solution can reach 99%. When reused for the fifth time, the photocatalytic activity of ZnO particles was similar with the fresh ones, and recycled for the tenth time, the degradation rate of methyl orange aqueous solution still standed by 84.7%.

Phosphate recovery from an aqueous solution through adsorption-desorption cycle over thermally treated activated carbon

2020 ◽  
Vol 36 ◽  
pp. 101302 ◽  
Author(s):  
Toshiki Miyazato ◽  
Nuryono Nuryono ◽  
Mrina Kobune ◽  
Bambang Rusdiarso ◽  
Ryoichi Otomo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Phosphate Recovery ◽  
Adsorption Desorption ◽  
Desorption Cycle ◽  
Thermally Treated

Synthesis of Ni(II)-imprinted Mesoporous Silica Adsorbents by Surface Imprinting Technology for Removal of Ni(II) from Aqueous Solution

2014 ◽  
Vol 997 ◽  
pp. 146-149
Author(s):  
Xiang Guo Meng ◽  
Wen Lu Guo ◽  
Min Luo ◽  
Ping Sun
Keyword(s):  
Aqueous Solution ◽  
Mesoporous Silica ◽  
Nitrogen Adsorption ◽  
Mesoporous Structure ◽  
Surface Imprinting ◽  
Surface Imprinting Technique ◽  
Silica Adsorbents ◽  
Ft Ir ◽  
Surface Imprinting Technology ◽  
Adsorption Desorption

Ni(II)-imprinted polymer has been prepared by surface imprinting technique based on support matrix of mesoporous silica SBA-15. The obtained adsorbent was characterized by FT-IR, SEM, and nitrogen adsorption-desorption. The compound retained mesoporous structure and the polymer coated inside channels and outside surface hole wall. The adsorption behavior was carried out with Ni(II)-IIP in batch experiments. The results suggested that Ni(II)-IIP could be used as an excellent adsorbent for efficient removal of Ni(II) from aqueous solution.

scholarly journals Heterogeneous Fenton Oxidation Using Magnesium Ferrite Nanoparticles for Ibuprofen Removal from Wastewater: Optimization and Kinetics Studies

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Andrei Ivanets ◽  
Vladimir Prozorovich ◽  
Marina Roshchina ◽  
Inga Grigoraviciute-Puroniene ◽  
Aleksej Zarkov ◽  
...  
Keyword(s):  
Fenton Reaction ◽  
Mesoporous Structure ◽  
Ferrite Nanoparticles ◽  
High Catalytic Activity ◽  
Magnesium Ferrite ◽  
Solution Ph ◽  
Morphological Studies ◽  
Oxidant Concentration ◽  
Iron Leaching ◽  
Heterogeneous Fenton Oxidation

In this study, the catalytic properties of Fenton-like catalyst based on magnesium ferrite nanoparticles for IBP degradation were examined. Structural and morphological studies showed the low crystallinity and mesoporous structure for the catalyst obtained via a glycine-nitrate method. The influences of catalyst dosage, oxidant concentration, and solution pH on the pollutant degradation were investigated. The pseudo-first-order model describes kinetic data, and under optimal condition (catalyst dose of 0.5 g L-1, H2O2 concentration of 20.0 mM, and pH of 8.0), apparent rate constant reached 0.091 min-1. It was shown that Fenton reaction was mainly induced by iron atoms on the catalyst surface, which is supported by very low iron leaching (up to 0.05 mg L-1) and high catalytic activity at neutral solution pH (6.0-8.0). It was found that the IBP mineralization onto magnesium ferrite catalyst was rapid and reached up to 98-100% within 40 min. Thus, prepared magnesium ferrite nanoparticles can be used as an effective Fenton-like catalyst for the IBP degradation from wastewater.

The Preparation of Aniline Formaldehyde Condensate-Mesoporous Materials Compound and the Application in Adsorption of Zn(II) and Pb(II) in Aqueous Solution

2013 ◽  
Vol 781-784 ◽  
pp. 2229-2232 ◽  
Author(s):  
Yan Liu ◽  
Ze Yang Zhu ◽  
Xiang Guo Meng ◽  
Hai Xu Yin ◽  
Min Jia Meng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Mesoporous Materials ◽  
Mesoporous Structure ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Scanning Electron

The amine aldehydes resin-mesoporous materials complex AFC-SBA-15 was synthesized using ordered mesoporous materials SBA-15 as the carrier. The obtained compound was characterized by FT-IR,N2adsorption-desorption and scanning electron microscopy. The compound retained ordered mesoporous structure and the resin polymer coated inside channels and outside surface hole wall. The adsorption behavior was carried out with the presence of EDTA in binary components of Pb (II) and Zn (II). The result showed that with the presence of EDTA, tunable selectivity could be realized.

scholarly journals Synergistic Effect of Dielectric Barrier Discharge Plasma and TiO2-Pillared Montmorillonite on the Degradation of Rhodamine B in an Aqueous Solution

Catalysts ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 359
Author(s):  
Mikhail F. Butman ◽  
Andrey A. Gushchin ◽  
Nikolay L. Ovchinnikov ◽  
Grigoriy I. Gusev ◽  
Nikolay V. Zinenko ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Dielectric Barrier Discharge ◽  
Rhodamine B ◽  
Barrier Discharge ◽  
Dye Degradation ◽  
Energetic Efficiency ◽  
Dbd Plasma ◽  
Catalytic Method ◽  
Dielectric Barrier ◽  
Pillared Montmorillonite

Photocatalytic, plasma and combined plasma–photocatalytic processes were applied for the destruction of a model pollutant, Rhodamine B dye, in an aqueous solution (concentration of 40 mg/L). For this purpose TiO2-pillared montmorillonite was used as a photocatalyst (characterized by X-ray analysis and low-temperature nitrogen adsorption/desorption). It was prepared by the method of intercalation of titanium hydroxocomplexes, including hydrothermal activation of the process and preliminary mechanical treatment of the layered substrate. The dielectric barrier discharge (DBD) plasma in the presence of photocatalysts increases the efficiency of dye degradation (100%, 8 s) compared to plasmolysis (94%) and UV photolysis (92%, 100 min of UV irradiation); in contrast to photolysis, destructive processes are more profound and lead to the formation of simple organic compounds such as carboxylic acids. The plasma–catalytic method enhances by 20% the energetic efficiency of the destruction of Rhodamine B compared to DBD plasma. The efficiency of dye destruction with the plasma–catalytic method increases with the improvement of the textural properties of the photocatalyst.

scholarly journals Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3598
Author(s):  
Nirmal K. Shee ◽  
Hee-Joon Kim
Keyword(s):  
Aqueous Solution ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Self Assembly ◽  
The Self ◽  
Assembly Process ◽  
Absorption Bands ◽  
Ligand Coordination ◽  
Rhodamine B Dye ◽  
Metal Ligand

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

Recovery of Gallium from Aqueous Solution through Preconcentration by Adsorption/Desorption on Disordered Mesoporous Carbon

2021 ◽  
Vol 7 (1) ◽  
pp. 227-242
Author(s):  
E. Díez ◽  
J. M. Gómez ◽  
A. Rodríguez ◽  
I. Bernabé ◽  
J. Galán
Keyword(s):  
Aqueous Solution ◽  
Mesoporous Carbon ◽  
Adsorption Desorption

scholarly journals Chitosan/Zeolite Composite Aerogels for a Fast and Effective Removal of Both Anionic and Cationic Dyes from Water

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1691
Author(s):  
Angela Marotta ◽  
Enrica Luzzi ◽  
Martina Salzano de Luna ◽  
Paolo Aprea ◽  
Veronica Ambrogi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Broad Spectrum ◽  
Organic Dyes ◽  
Indigo Carmine ◽  
Zeolite 13X ◽  
Industrial Sectors ◽  
Effective Removal ◽  
Composite Aerogels ◽  
Zeolite Composite ◽  
Adsorption Desorption

Organic dyes are extensively used in many industrial sectors, and their uncontrolled disposal into wastewaters raises serious concerns for environmental and human health. Due to the large variety of such pollutants, an effective remediation strategy should be characterized by a broad-spectrum efficacy. A promising strategy is represented by the combination of different adsorbent materials with complementary functionalities to develop composite materials that are expected to remove different contaminants. In the present work, a broad-spectrum adsorbent was developed by embedding zeolite 13X powder (ZX) in a chitosan (CS) aerogel (1:1 by weight). The CS–ZX composite adsorbent removes both anionic (indigo carmine, IC) and cationic (methylene blue, MB) dyes effectively, with a maximum uptake capacity of 221 mg/g and 108 mg/g, respectively. In addition, the adsorption kinetics are rather fast, with equilibrium conditions attained in less than 2 h. The composite exhibits good mechanical properties in both dry and wet state, which enables its handling for reusability purposes. In this regard, preliminary tests show that the full restoration of the IC removal ability over three adsorption–desorption cycles is achieved using a 0.1 M NaOH aqueous solution, while a 1 M NaCl aqueous solution allows one to preserve >60% of the MB removal ability.

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