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

Abstract

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.

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

“…Experimental conditions for DPD degradation were adapted from relevant literature [31], wherein a significant excess of peroxide was employed to ensure operation in a regime where complete oxidation was possible. The solution pH was initially 4 and decreased slightly to 3.1 over the course of reaction, presumably due to the formation of acidic oxidation products.…”

“…In many of these systems iron leaching and concomitant catalyst deactivation was reported. An important but little studied neutral amine N,N-diethyl-p-phenyl diamine (DPD) is used widely in color photography, as a dye intermediate, rubber component, and reducing agent in the petrochemical industry [30,31] and its discharge into water streams can cause allergic dermatitis in humans [32] We reported recently DPD degradation using a FeTUD-1 catalyst, which afforded reductions of 91% of COD and 80% of TOC under mild reaction conditions [31]. Herein, we report a simple preparative route to a bimetallic CuFe/SBA-15 catalyst, comprising highly dispersed Cu and Fe oxides for the Fenton-like oxidation of DPD in aqueous solution under mild conditions in which synergy between the transition metals confers excellent degradation performance.…”

Lewis acidic mesoporous Fe-TUD-1 as catalysts for synthesis of Hantzsch 1,4-dihydropyridine derivatives

“…After adsorption of ammonia, Helium was flown to remove physisorbed ammonia before raising the temperature of analysis and a baseline analysis was manually carried out to integrate the area of the NH 3 desorption. The detailed procedure of these characterization methods were described in our pervious papers [29,31].…”

“…Fe-TUD-1 with Si/Fe ratio of 40 was synthesized according to our previous reports [31]. The catalyst samples were characterized by XRD (Rigaku, 2h range of 10°-80°and BrukerD8, 2h range of 0.5°-5°), nitrogen physisorption (QuantosorbSI), elemental composition (ICP-OES using a Perkin Elmer OES Optima 5300 DV spectrometer) and diffuse reflectance UV-Vis (Shimadzu UV-2401 spectrophotometer).…”

Photochemical oxidation of methyldiethanolamine (MDEA) in aqueous solution by UV/K2S2O8 process

“…The Fenton' reagent in the AOPs was used to degrade MEA [10], DEA [11], N,N-diethyl-p-phenylenediamine [12] and DIPA [13]. Also, the use of UV/H 2 O 2 in the AOPs for degradation of MEA and MDEA [4,14] and ozonation for degradation of DEA [15] have been studied.…”