Granular activated carbon (GAC) adsorption-photocatalysis hybrid system in the removal of herbicide from water

Areerachakul, Nathaporn; Vigneswaran, S.; Ngo, Huu Hao; Kandasamy, Jaya

doi:10.1016/j.seppur.2006.12.007

Cited by 49 publications

(28 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among them, adsorption onto solid adsorbents has environmental significance, since it can effectively remove pollutants from both aqueous and gaseous streams (Aksu and Kabasakal 2004;Kah and Brown 2007;Areerachakul et al 2007). …”

Section: A Smentioning

confidence: 99%

Separation characteristics of some phenoxy herbicides from aqueous solution

et al. 2008

View full text Add to dashboard Cite

The adsorption and desorption characteristics of some phenoxy herbicides (CPA 2,4-D, and MCPA) from an aqueous solution on the active carbon materials (GAC, F-400) were studied. Adsorption equilibrium capacities of the phenoxy herbicides increased with a decrease in pH of the solution. Adsorption equilibrium isotherms were represented by the Sips equation. Kinetic parameters were measured in a batch adsorber to analyze the adsorption rates of the phenoxy herbicides. The internal diffusion coefficients were determined by comparing the experimental concentration curves with those predicted from the surface diffusion model and the pore diffusion model. The adsorption model based on the linear driving force approximation (LDFA) was used to simulate the adsorption behavior of the phenoxy herbicides in a fixed bed adsorber. Over 95 percent desorption of the phenoxy herbicides was obtained using distilled water. NomenclaturesA s surface area of the adsorbent particles, m 2 b isotherm parameter, m 3 /mol c equilibrium concentration of the solution, mol/m 3 c o initial liquid phase concentration, mol/m 3 c i initial concentration of bulk fluid, mol/m 3 c s concentration on the surface of adsorbent, mol/m 3 D e,p effective diffusion coefficient, m 2 /sec D L axial dispersion coefficient, m 2 /sec D m molecular diffusion coefficient, m 2 /sec d p particle diameter, m D p effective pore diffusion coefficient, m 2 /sec D s effective surface diffusion coefficient, m 2 /sec k isotherm parameter, [mol/kg][mol/m 3 ] −1/n k f film mass transfer coefficient, m/sec M total mass of sorbent particle, kg n isotherm parameter, -N A rate of mass transfer of adsobates to the external surface of the adsorbent, mol/s q m maximum adsorption capacity of adsorbent, mol/kg q o initial adsorbed phase adsorbate concentration, mol/kg r radial distance, m R p particle radius, m t time, sec, hr V volume of solution, m 3 v interstitial velocity, m/s W weight of adsorbent, kg

show abstract

Section: A Smentioning

confidence: 99%

Separation characteristics of some phenoxy herbicides from aqueous solution

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Adsorption by activated carbon (AC) has been used successfully for the advanced (tertiary) treatment of municipal and industrial wastewater (EPA, 2000;Coelho et al, 2006;Areerachakul et al, 2007;El-Sharkawy et al, 2007). The main disadvantage of such methodology is that the saturated AC must be regenerated before reuse (Sheintuch and Matatov-Meytal, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…The main disadvantage of such methodology is that the saturated AC must be regenerated before reuse (Sheintuch and Matatov-Meytal, 1999). Moreover, the spent carbon itself may have to be handled as a hazardous waste at the end of the treatment (Sheintuch and Matatov-Meytal, 1999;Coelho et al, 2006;Areerachakul et al, 2007). Therefore, decomposition of the adsorbed organics and regeneration of the adsorbent is a very critical step to the cost-effective use of AC in water treatment.…”

Section: Introductionmentioning

confidence: 99%

Trapping and decomposing of color compounds from recycled water by TiO2 coated activated carbon

Zhu

Zou

2009

Journal of Environmental Management

View full text Add to dashboard Cite

“…Photo-Fenton gives 20% higher removal than Fenton UV was not enough to degrade bisphenol A. Experiments with UV/H 2 O 2 give a better removal of estrogenic activity was dosed at a rate of 1.5 g L −1 ; C 0 = 10 mg L −1The system had a high removal rate of over 90%Areerachakul et al[82] …”

mentioning

confidence: 99%