Copper on activated carbon for catalytic wet air oxidation

Abstract

Textile industry is an important source of water contamination. Some of the organic contaminants cannot be eliminated by nature in a reasonable period. Heterogeneous catalytic wet air oxidation is one of the most effective methods to purify wastewater with organic contaminants. In this work, catalysts based on copper supported on activated carbon were synthesized. The activated carbons were obtained from industrial wastes (apricot core and grape stalk) of San Juan, Argentina. These were impregnated with a copper salt and thermically treated in an inert atmosphere.Analysis of specific surface, pore volume, p zc , acidity, basicity and XRD patterns were made in order to characterize the catalysts. The catalytic activity was tested in the oxidation of methylene blue (MB) and polyvinyl alcohol (PVA) in aqueous phase with pure oxygen. Reaction tests were carried out in a Parr batch reactor at different temperatures, with a 0.2 MPa partial pressure of oxygen. The amount of unconverted organics was measured by spectrophotometry.Higher temperatures were necessary for the degradation of PVA compared to those for methylene blue.

Oxidative degradation of Methyl Orange catalyzed by lab prepared nickel hydroxide in aqueous medium

“…Expression (14) is simplified by keeping concentration of hydrogen peroxide constant. Table 2) are true rate constants (true in the sense that contributions of adsorption equilibrium constant of Methyl Orange have been excluded); hence, activation energy calculated using these rate constants is true activation energy, E T , which was found as 32.7 kJ mol −1 (Fig.…”

“…It is the oxidation of dyestuff in aqueous medium at high temperature (398-593 K) and pressure (0. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] in the presence of oxygen. However, high temperature and pressure in wet oxidation process appeals high machinery and practical costs which can be reduced using a proper homogeneous or heterogeneous catalyst.…”

“…However, due to economical point of view, the use of cheap metals Ni, Co, Mn, Cu, and Nb etc. as catalysts have gained great attention [13][14][15]. Certain heterogeneous catalysts have been pursued for removal of Methyl Orange dye from water [16][17][18][19][20].…”

An investigation on the characterization of activated carbon from areca leaves and their adsorption nature towards different dyes

“…Application of activated carbon from biodegradable product is turned out to be benefit over the commercial carbon and this has encouraged the researchers in the use of different agricultural waste. Rice husk (Mohanty et al, 2006), date stone (Bouchelta et al, 2008), olive stones (El-Sheikh et al, 2004), apricot core, grape stalk (Martinez et al, 2009), maize cob (Ketcha et al, 2012), coconut shell (Yang et al, 2010), Zapota seed ( Nath et al, 2008), aloevera green (Omidi et al, 2015) etc. have been studied as raw materials and found to be preferable raw materials for the preparation of activated carbon.…”

Synthesis, characterization and catalytic of a solid acid supported on amorphous activity carbon

“…Activated carbon received more attention due to its excellent catalytic support characteristics for the oxidation of organic compounds and because of its flexibility for supporting catalysts. It is well know that activated carbon adsorbs chemical compounds from aqueous and gaseous phases, because of its high surface area, flexible pore structure and chemical nature of the surface [27][28][29][30] .Surface characteristics and surface behavior of the catalyst are influenced by carbon-oxygen functional groups. The porous structure and surface chemistry properties of AC are important connection with its adsorbent behavior [31,32] .Therefore, some reports show the ACs and CNTs (pretreated with HNO 3 ) supported catalysts show the local hydrophilicity of the catalysts can be tuned by treating the carbonaceous supports with HNO 3 at various conditions.…”