Rapid Degradation of Methyl Orange by Ag Doped Zeolite X in the Presence of Borohydride

Abidin, A. Zainal; Bakar, Noor Hana Hanif Abu; Ng, E. P.; Tan, Wei

doi:10.1016/j.jtusci.2017.06.004

Cited by 49 publications

(15 citation statements)

References 36 publications

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“…The spectrum of pure zeolite contained two additional bands at: 741.97 cm −1 and 658.57 cm −1 , which can be attributed to symmetric T-O-T stretching and symmetric Si-O-Si stretching, respectively. All above bands are typical for zeolites X [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

et al. 2021

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Pure zeolite (Na-X) and a zeolite–carbon composite (Na-X(C)) were investigated as adsorbents of heavy metals—Pb2+ and Zn2+ from an aqueous solution. These materials were synthesized from fly ash—a waste from conventional hard coal combustion. Both solids were characterized using XRD, SEM-EDS, nitrogen adsorption/desorption, particle size and elemental composition analyses. The adsorption study was performed at pH 5 in the systems containing one or two adsorbates simultaneously. The obtained results showed that the pure zeolite was characterized by a more developed surface area (728 m2/g) than its carbon composite (272 m2/g), and the mean pore diameters were equal to 1.73 and 2.56 nm, respectively. The pure Na-X zeolite showed better adsorption properties towards heavy metals than its Na-X(C) composite, and Zn2+ adsorbed amounts were significantly higher than the Pb2+ ones (the highest experimental adsorption levels were: for Zn2+—656 and 600 mg/g, and for Pb2+—575 and 314 mg/g, on the Na-X and Na-X(C) surfaces, respectively). The zinc ions are exchanged with the cations inside the zeolite materials structure more effectively than lead ions with a considerably larger size. In the mixed systems, the competition between both heavy metals for access to the active sites on the adsorbent surface leads to the noticeable reduction in their adsorbed amounts. Moreover, the hydrochloric acid was a better desorbing agent for both heavy metals, especially Pb2+ one (desorption reached 78%), than sodium base (maximal desorption 25%).

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Section: Resultsmentioning

confidence: 99%

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

et al. 2021

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“…The synthesized Ag/HNTs while perform- ing on par with other Ag catalysts for the degradation of MO and Rh6G. 25,[77][78][79] although, the K value in this work is 0.21 min -1 which is slightly lower compared to the Ag supported on zeolite (0.30 min -1 ), 77 it has the advantage of using much smaller amounts of Ag. In the present work, amount of used Ag/HNTs as catalyst is 2.4 times less than the AgNPs/Zeolite X, hence, the Ag/HNT catalysis would be more economical compared to the other catalysts reported in Table 4.…”

Section: Effect Of Phmentioning

confidence: 67%

“…25,78 not only because of low concentrations used but also due to the easy recovery and reusability. The halloysite as a natural mineral with high stability as support material for Ag nanoparticles, while Zeolite X 77 is not natural and its preparation is costly. Also, although the Ag/tannic acid membrane 79 has inner shell as natural substrate but this substrate is unstable.…”

Section: Effect Of Phmentioning

confidence: 99%

Fabrication of Silver-Modified Halloysite Nanotubes and their Catalytic Performance in Rhodamine 6G and Methyl Orange Reduction

Akhondi

Jamalizadeh

2019

ACSi

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Halloysite nanotube supported Ag nanoparticles (Ag/HNT) as catalyst for reduction of Rhodamine 6G (Rh6G) and Methyl orange (MO) have been synthesized and tested. 3-glycidyloxyproyltrimethoxysilane and Triethylene tetramine were successfully utilized to modify the HNTs surface, then Ag + ions were reduced to AgNPs on this functionalized HNT surface. The structure of AgNPs-impregnated HNT wall was characterized by FTIR, XRD, TEM, FE-SEM and EDX showing the AgNPs to be 10-15 nm in size. The catalytic activity of Ag/HNTs for Rh6G and MO reduction was investigated by UV-vis spectroscopy so as catalyzed and uncatalyzed reaction rate constants could be compared. The rate constant (k) of Rh6G and MO reduction was calculated for catalyzed reactions as 0.224 min-1 and 0.222 min-1 , and for un-catalyzed reactions as 0.049 min-1 and 0.014 min-1 , respectively. The Ag/HNT catalyzer was effectively recycled six times without appreciable loss of activity. Results indicate that supporting AgNPs on HNT surface functionalized with other compounds with superior performance in reducing Rh6G and MO dyes exist.

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“…Figure 2 presents the FT-IR spectra of Fe-Co-V/Zeolite and Fe-Co-Mo/Zeolite CNs in the wavenumber ranged from 400 to 4000 cm -1 . The bands at 458 and 463 can be assigned to the bending vibrations of the T-O (T=Al, Si groups) in the zeolite 30,31 . This band also depicted the bending vibration of internal tetrahedron TO4 of the zeolite structure.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Trimetallic Fe-Co-V/Zeolite and Fe-Co-Mo/Zeolite Composite Nanostructures

et al. 2021

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The facile chemical synthesis method was used for preparing Trimetallic Fe-Co-V/Zeolite and Fe-Co-Mo/Zeolite composite nanostructures. The structural functionalities and morphological observations were obtained using characterization techniques of field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier transfer infrared (FT-IR) spectroscopy, and energy dispersive spectroscopy (EDS). The results indicated the formation of irregular and no-shaped nanostructures for both Fe-Co-V/Zeolite and Fe-Co-Mo/Zeolite composite nanostructures. The optical characterization was conducted by UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The optical studies were revealed band-gap energies equivalent to 3.0 and 3.5 eV for Fe-Co-V/Zeolite and Fe-Co-Mo/Zeolite samples. The morphological features of sample were investigated with a Zeiss (EM10C -Germany) transmission electron microscope (TEM) operating at 100 kV respectively.

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Rapid Degradation of Methyl Orange by Ag Doped Zeolite X in the Presence of Borohydride

Cited by 49 publications

References 36 publications

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

Simultaneous Removal of Pb2+ and Zn2+ Heavy Metals Using Fly Ash Na-X Zeolite and Its Carbon Na-X(C) Composite

Fabrication of Silver-Modified Halloysite Nanotubes and their Catalytic Performance in Rhodamine 6G and Methyl Orange Reduction

Synthesis and Characterization of Trimetallic Fe-Co-V/Zeolite and Fe-Co-Mo/Zeolite Composite Nanostructures

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