The impact of the copper source on the synthesis of meso-structured CuTUD-1: a promising catalyst for phenol hydroxylation

Applied Catalysis B: Environmental

Pachamuthu

Isaacs

et al. 2016

124

a b s t r a c tA bimetallic oxidation catalyst has been synthesized via wet impregnation of copper and iron over a mesoporous SBA-15 silica support. Physicochemical properties of the resulting material were characterized by XRD, N 2 physisorption, DRUVS, FTIR, Raman, SEM and HRTEM, revealing the structural integrity of the parent SBA-15, and presence of highly dispersed Cu and Fe species present as CuO and Fe 2 O 3 . The CuFe/SBA-15 bimetallic catalyst was subsequently utilized for the oxidative degradation of N,N-diethylp-phenyl diamine (DPD) employing a H 2 O 2 oxidant in aqueous solution.

Section: Catalyst Characterizationsupporting

confidence: 62%

Section: Catalyst Characterizationmentioning

confidence: 96%

Cu and Fe oxides dispersed on SBA-15: A Fenton type bimetallic catalyst for N,N -diethyl- p -phenyl diamine degradation

Applied Catalysis B: Environmental

Pachamuthu

Isaacs

et al. 2016

124

“…Bulk CuO is ESR silent, whereas both dispersed CuO and isolated Cu(II) sites are ESR active, and the signal intensities were affected by the presence of these neighboring species32 . Bulk CuO is ESR silent, whereas both dispersed CuO and isolated Cu(II) sites are ESR active, and the signal intensities were affected by the presence of these neighboring species32 .…”

mentioning

confidence: 99%

Hydroxyl radical generation by cactus-like copper oxide nanoporous carbon catalysts for microcystin-LR environmental remediation

Dionysiou

Lee

et al. 2016

Catal. Sci. Technol.

Copper oxide supported on nanoporous activated carbon (CuO-NPAC) is reported for the aqueous phase catalytic degradation of cyanotoxin microcystin-LR (MC-LR). The loading and spatial distribution of CuO throughout the NPAC matrix strongly influences catalytic efficiency. CuO-NPAC synthesis was optimized with respect to the copper loading and thermal processing, and the physicochemical properties of the resulting materials characterized by XRD, BET, TEM, SEM, EPR, TGA, XPS and FT-IR spectroscopy. EPR spin trapping and fluorescence spectroscopy evidenced in situ • OH, formation via H 2 O 2 over CuO-NPAC as the catalytically relevant oxidant. The impact of reaction conditions, notably CuO-NPAC loading, H 2 O 2 concentration and solution pH, are discussed in relation to the reaction kinetics for MC-LR remediation.

“…The N 2 physisorption isotherm of FeTUD-1 catalyst ( Fig. 1a) exhibited type IV isotherm characteristics of mesostructured materials and due to disordered pores, wormhole natured H2-type hysteresis was observed [29][30][31][32]. A specific surface area of 650 m 2 /g and a pore volume of 0.67 cm 3 /g were estimated from adsorption isotherm of FeTUD-1.…”

Section: Results and Discussion 31 Characterizations Of Fetud-1mentioning

confidence: 99%

“…Low angle powder X-ray diffraction (XRD) ( Fig. 2a) illustrated that a low intense diffraction peak at 0.8°(2u) was attributed to the disordered arrangements of mesopores in FeTUD-1 [29][30][31][32]35]. On the other hand, the wide angle XRD of the sample (Fig.…”

Section: Results and Discussion 31 Characterizations Of Fetud-1mentioning

confidence: 99%

Fenton‐Type Oxidative Degradation of N,N‐Diethyl‐p‐phenylenediamine by a Mesoporous Wormhole Structured FeTUD‐1 Catalyst

Pachamuthu

Sekaran

et al. 2014

CLEAN Soil Air Water

Self Cite

ABSTACT Interconnected, amorphous three dimensional, iron‐containing TUD‐1 (FeTUD‐1, Si/Fe = 25) mesoporous silica was subjected as a catalyst for degradation of refractory organic compound. The catalyst was prepared by economical, eco‐friendly sol–gel method and characterized by various techniques, such as X‐ray diffraction, N2 sorption studies, diffuse reflectance UV‐Vis, Fourier transform IR, inductively coupled plasma optical emission spectrometry, scanning electron microscopy and electron paramagnetic resonance to understand the morphology and nature of the Fe species. The catalytic activity was evaluated by the oxidation of N,N‐diethyl‐p‐phenylenediamine (DPD) with H2O2 and air. All degradation studies were analyzed by UV‐Vis spectroscopy, chemical oxygen demand, and total organic carbon measurements. The effect of time, pH, H2O2 concentration, and amount of FeTUD‐1 catalyst on the DPD degradation were also examined. Heterogeneous FeTUD‐1 showed a good catalytic performance than homogeneous FeSO4 Fenton oxidation process. Besides, leaching of Fe (∼12%) was observed at pH 2. The reaction kinetics of FeTUD‐1 catalyzed degradation illustrates a first‐order kinetics. Possible degradation mechanism and formed products are discussed.