Activated carbon and ceria catalysts applied to the catalytic ozonation of dyes and textile effluents

The objective of this study is to compare the performances of catalytic ozonation processes of two activated carbons prepared from olive stone (ACOS) and apricot stone (ACAS) with commercial ones (granular activated carbon-GAC and powder activated carbon-PAC) in degradation of reactive azo dye (Reactive Red 195). The optimum conditions (solution pH and amount of catalyst) were investigated by using absorbencies at 532, 220 and 280 nm wavelengths. Pore properties of the activated carbon (AC) such as BET surface area, pore volume, pore size distribution, and pore diameter were characterized by N2 adsorption. The highest BET surface area carbon (1,275 m2/g) was obtained from ACOS with a particle size of 2.29 nm. After 2 min of catalytic ozonation, decolorization performances of ACOS and ACAS (90.4 and 91.3%, respectively) were better than that of GAC and PAC (84.6 and 81.2%, respectively). Experimental results showed that production of porous ACs with high surface area from olive and apricot stones is feasible in Turkey.

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Catalytic ozonation of pentachlorophenol in aqueous solutions using granular activated carbon

Applied Water Science ◽

10.1007/s13201-014-0254-y ◽

2014 ◽

Vol 7 (1) ◽

pp. 393-400 ◽

Cited By ~ 8

Author(s):

Ghorban Asgari ◽

Fateme Samiee ◽

Mohammad Ahmadian ◽

Ali Poormohammadi ◽

Bahman solimanzadeh

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Granular Activated Carbon ◽

Catalytic Ozonation

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Characteristics of Activated Carbon Modified with Nitric Acid and its Performance in Catalytic Ozonation of Acid Red 3R

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.1687 ◽

2013 ◽

Vol 726-731 ◽

pp. 1687-1690

Author(s):

Jing Zhang ◽

Jian Song Liu ◽

Chun Liu ◽

Jing Liang Yang ◽

Lei Zhang

Keyword(s):

Activated Carbon ◽

Nitric Acid ◽

Adsorption Capacity ◽

Functional Groups ◽

Chemical Properties ◽

Catalytic Ozonation ◽

Alkaline Condition ◽

Ozone Decomposition ◽

Acid Modification ◽

Modified Activated Carbon

The structure and surface chemical properties of activated carbon after nitric acid modification and their influences on adsorption and catalytic ozonation of acid red 3R were investigated. The results showed that both specific surface area and micropore volume of activated carbon decreased, but mesopore volume increased after nitric acid modification. The adsorption capacity and catalytic ozonation performance of modified activated carbon were influenced due to the increased surface acidic functional groups. The adsorption capacity of modified activated carbon was enhanced under acidic condition due to dispersion interaction between increased surface acidic functional groups and acid red 3R. The increase in surface acidic functional groups of activated carbon was also considered to be responsible for improvement of the catalytic ozonation of acid red 3R under alkaline condition, because of their participation in the ozone decomposition and OH generation.

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