Comparison between thermal and ozone regenerations of spent activated carbon exhausted with phenol

Álvarez, Pedro M.; Beltrán, Fernando J.; Gómez-Serrano, V.; Jaramillo, J.; Rodrı́guez, Eva M.

doi:10.1016/j.watres.2004.01.030

Cited by 162 publications

(91 citation statements)

References 36 publications

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“…Thus, in the case of phenol adsorption, pyrolysis features revealed two binding states, a physisorbed state, which desorbed at 220 8C, and a chemisorbed state, which desorbed at 400 8C. This is in agreement with the results of other authors on the regeneration of activated carbons saturated with phenol [7,[21][22][23].…”

Section: Resultssupporting

confidence: 91%

Pyrolysis of activated carbons exhausted with organic compounds

Ania¹,

Parra²,

Pevida³

et al. 2005

Journal of Analytical and Applied Pyrolysis

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The regeneration of activated carbons used for the decontamination of water and wastewater polluted with organic compounds related to the pharmaceutical industry, has been studied in this work. To this end, the pyrolysis of exhausted activated carbons was performed in a quartz reactor. The influence of the pyrolysis of saturated activated carbons on their adsorptive capacities and porous structure was evaluated. Textural characterisation of the samples was carried out by helium density, and N 2 and CO 2 adsorption isotherms, at À196 and 0 8C, respectively. Consecutive cycles of pyrolysis of activated carbons exhausted with phenol and salicylic acid, generated a widening of the microporosity, and a decrease in the apparent BET surface areas. The adsorptive capacities for phenol retention after a series of adsorption/ pyrolysis cycles were found to decrease drastically. In contrast, consecutive cycles gave higher salicylic acid adsorptive capacities, as compared to phenol. The DTG pyrolysis profiles of the samples saturated with salicylic acid appeared at lower temperatures than those of phenol, which showed two peaks, while those exhausted with salicylic acid only showed one. These results provide evidence of the different adsorption mechanisms of these two pollutants.

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Section: Resultssupporting

confidence: 91%

Pyrolysis of activated carbons exhausted with organic compounds

Ania¹,

Parra²,

Pevida³

et al. 2005

Journal of Analytical and Applied Pyrolysis

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“…Smaller waste treatment sites normally transport their activated carbon cores to specialized facilities for regeneration. This increases the footprint of the carbon [31].…”

Section: Thermodynamicsmentioning

confidence: 99%

Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

Kyzas

Mitropoulos

2018

EWaS3 2018

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Abstract:In the present study, activated carbons (PAC) were hydrothermally prepared with an environmental friendly preparation route after pyrolysis from biomass (specifically from agricultural (potato) peels). The prepared biochars were activated with potassium hydroxide (chemical activities). The preparation route had a strong impact on the pore structure of PAC. In addition, surface chemistry was also affected by the preparation and activation process. The adsorbent materials were also characterized by Scanning Electron Microscopy. The prepared activated carbons were used as adsorbents for the removal of lead ions. Batch experiments were performed to investigate the effect of physico-chemical parameters, such as pH, contact time, initial metal concentration and temperature. Equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The thermodynamic parameters such as the change of enthalpy (ΔH 0 ), entropy (ΔS 0 ) and Gibb's free energy (ΔG 0 ) of adsorption systems were also determined and evaluated.

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“…These methods include water under sub-critical conditions [23], steam [24], pyrolysis [25], direct ozonation [26], ultrasound [27], wet peroxide oxidation [28], surfactants [29], bio-regeneration [30], microwave [31,32] and electrochemical methods [33,34]. Although the effectiveness of any method depends on the application and the type of wastewater treated, the activated carbon was reported to be fully regenerated in most of these cases and reused for many cycles.…”

Section: Introductionmentioning

confidence: 99%