Heterogeneous catalytic ozonation of diethyl phthalate

Multiwalled Carbon Nanotubes for Heterogeneous Nanocatalytic Ozonation

“…Properties of the CNTs used are shown in Table 2. Activated carbon was provided by Chemviron, UK and its characteristics were determined in a previous study (Mansouri et al, 2013) and are also summarised in Table 2. Other chemicals of reagent grade were purchased from either Sigma Aldrich, UK or Fisher Scientific, UK.…”

“…At the four inlet ozone concentrations 2, 4, 6 and 8 g/m 3 NTP, the ratio of the overall ozone supplied to the reactor to the mass of dye removed was calculated and the values were 0.91, 0.63, 0.51 and 0.40 mg MO removed/mg O 3 supplied respectively. Assuming that the observed decrease in MO concentration over time is described by a pseudo-first-order reaction kinetics (Mansouri et al, 2013), the values of the rate constant, k obs , for the different ozone concentrations are shown in Table 3. As the ozone concentration increased to 6 g/m 3 NTP, k obs also increased almost linearly at a rate of 0.162 (min -1 /g.m -3 ) before it remained almost constant for a concentration higher than 6 g/m 3 NTP.…”

“…The dose of catalyst is an important parameter in HCO since it affects the conversion of ozone into radical species as well as it affects the adsorption of the dissolved substances (Sanchez-Polo et al, 2005;Mansouri et al, 2013). The effect of CNT dose on MO decolourisation was investigated in this study by varying the CNT dose up to mg/L.…”

“…AOPs are generally based on redox mechanisms as a result of losing and gaining electrons by organic molecules and radicals respectively (Rice and Netzer, 1983). In the last decades, heterogeneous catalytic ozonation (HCO) has gained significant attention from the research community because of its effectiveness and its practical use (Legube and Leitner, 1999;Kasprzyk-Hordern et al, 2003;Li et al, 2010;Mansouri et al, 2013). Depending on the nature of the catalyst and the operating conditions such as pH and the type of the substance to degrade, some research studies have shown that the degradation takes place via hydroxyl radical reactions and classify HCO as AOPs (Jans and Hoigne, 1998), whilst others have shown that degradation by HCO proceeds mainly via direct reactions of adsorbed molecular ozone or via other radical types than • OH (Kaptijn, 1997;Kasprzyk-Hordern et al, 2003).…”

Interface behavior of PbO2on pure lead and stainless steel as anode for dye degradation

“…In this context, various advanced oxidations processes such as photocatalytic degradation [3], electrocoagulation [4], and ozonation [5] are used for treating textile wastewater. Anodic oxidation (AO) is attracting more and more attention as efficient methods to remove toxic organic compounds from wastewater [6] and textile effluents [7].…”