Batch and Column Studies of Phenol Adsorption by an Activated Carbon Based on Acid Treatment of Corn Cobs

Rocha, Pablo D.; Franca, Adriana S.; Oliveira, Leandro S.

doi:10.7763/ijet.2015.v7.837

Cited by 44 publications

(21 citation statements)

References 26 publications

(26 reference statements)

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“…The fast adsorption at the initial stage is attributed to the high values of concentration gradient in the beginning of the adsorption processes, representing a significant driving force for phenol transfer between the solution and the adsorbent surface. Such qualitative behavior was has also been reported for phenol adsorption by other materials [11], [12]. The results shown in Fig.…”

Section: B Effect Of Activating Agentsupporting

confidence: 84%

“…The pseudo-second-order model provided higher R 2 values and lower values of RMS error in carbons produced from CG and CH. This model has been successfully applied for description of adsorption kinetics of several adsorbates, describing both chemisorption and ion exchange mechanism [12]. An opposite behavior was observed for phenol adsorption by carbons obtained from PH, where the first order model provided a better fit.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Microwave Assisted Thermo-Chemical Procedures in the Production of Adsorbents for Wastewater Treatment

Alves¹,

Franca²,

Oliveira³

2015

IJESD

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Abstract-Agricultural residues were evaluated as raw material in the production of adsorbents for phenol removal from aqueous solutions. A comparative evaluation of acid and basic activating agents is presented. Adsorption kinetics and equilibrium were satisfactorily described by the pseudo second-order and Freundlich models, respectively. Adsorption tests showed that the prepared adsorbents presented higher adsorption capacity than activated carbons produced from other agricultural residues, confirming that this type of waste material is a suitable candidate for use in the production of adsorbents.

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Section: B Effect Of Activating Agentsupporting

confidence: 84%

Section: Adsorption Kineticsmentioning

confidence: 99%

Comparison of Microwave Assisted Thermo-Chemical Procedures in the Production of Adsorbents for Wastewater Treatment

Alves¹,

Franca²,

Oliveira³

2015

IJESD

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“…In case of low bed height of 50 mm it was found that breakthrough time was too short and the bed height was ineffective for adsorption of any toxicant in the column studies. It is observed that breakthrough curve follows ideal "S" shape profile which is the characteristic of presence of small molecules of adsorbates and also small size particles of adsorbent [36]. As the flow of wastewater is increased from 33.2 mL/min to 43.8 mL/min, the breakthrough time decreased from 45 to 25 min ( Table 2).…”

Section: A Steelmaking Slagmentioning

confidence: 94%

Column Studies for the Simultaneous Removal of Phenol, Ammonia and Thiocyanate by the Adsorption with Steel Slag

Dhoble¹

2018

IJRASET

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In the present studies adsorption of phenol, ammonia and thiocyanate are studied. Phenol, ammonia and thiocyanate co-exist in the coke-oven wastewater. Their presence in wastewater is harmful. High exposures to phenol may be fatal to human beings; infants appear to be hyper susceptible [1]. Ammoniamay cause eutrophication of surface water and is known to be toxic to all vertebrates causing neurological disorder, coma or even death [2]. Thiocyanate is less toxic however it is reported to affect the growth and reproductive system of the fish [3]. [27]. Most of the studies concluded that Langmuir and Freundlich describes isotherm and Pseudo second order model describes the kinetics of adsorption. It is also reported that presence of one pollutant in the wastewater effects the removal of other pollutant. Adsorption of phenol was found improved on the resin in the presence of ammonia [28]. Presence of thiocyanate is found to be affect the removal efficiency of phenol as well as ammonia [29]. Very few studies are focused on the use of industrial waste as an adsorbent. Most of the studies are focused on batch studies. Column studies provide the effect of bed height and performance of adsorbent under the continuous flow of wastewater. The aim of the study is to provide the performance of the steel slag as an adsorbent for the removal of phenol, ammonia and thiocyanate. Adsorbent used in these studies is a steel slag, the waste material from the steel industry. Piles of steel slag can be seen of the steel slag near the steel industries. Recently, steel slag has gained some commercial value and is known better for its use in as

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“…It is available in two different forms (powdered activated carbon and granular activated carbon) and its adsorptive properties mainly depend on pore size and internal surface area of the pores (Randtke & Horsley, 2012). During the synthesis of activated carbon, chemical activation, which involves the impregnation of the carbon structure with an activating agent (either an acid or base), is normally used to obtain the desired adsorbent properties (Rocha et al 2015). Though activated carbon adsorption has been recognized as one of competent material for water treatment process, its application is sometimes restricted due to its higher adsorbent cost (Gautam et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of H3PO4 and KOH as the Activating Agents on the Synthesis of Low-Cost Activated Carbon from Duckweeds Plants

Tan¹,

Chin²,

Ang³

et al. 2018

JKUKM

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Adsorption is a simple and easily operated treatment process for water and wastewater reclamation. However, the cost of activated carbon (adsorbent) is an obstacle for this process to be widely employed in developing and underdeveloped countries. Hence, a low-cost and easily available Duckweeds plant has been used as the raw material for the synthesis of low-cost activated carbon. In this study, the effect of activating agents; potassium hydroxide (KOH) and phosphoric acid (H 3 PO 4 ) on the properties of the activated carbon produced from Duckweeds plants was investigated. Duckweeds plants that were impregnated with an activating agent with a ratio 1:2 were carbonized in a tube furnace for two and a half hour at 550ºC with continuous nitrogen flow. After that, the synthesized activated carbon was used to remove methylene blue dye from aqueous solution. It was observed that activated carbon impregnated with H 3 PO 4 possessed a more extensive exfoliated and multilayer structure, which gave rise to better adsorption performance compared to activated carbon impregnated with KOH. Furthermore, the porosity of the activated carbon impregnated with was much higher (38 ± 6%) compared to the sample impregnated with KOH (22 ± 4%). Indeed, the removal of dye for the former was slightly better (3-5%) and achieved equilibrium adsorption within a shorter duration. The findings show that H 3 PO 4 is a better activating agent to induce exfoliated and multilayer structures on the activated carbon, where both of these characteristics are important for a good adsorption process. Overall, Duckweeds plants are a feasible source for the synthesis of low-cost activated carbon. Considering that Duckweeds plants can be used to remove nutrients presence in the wastewater, the activated carbon synthesized from the plants can be incorporated into the existing wastewater treatment plant as an additional purification process.

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Batch and Column Studies of Phenol Adsorption by an Activated Carbon Based on Acid Treatment of Corn Cobs

Cited by 44 publications

References 26 publications

Comparison of Microwave Assisted Thermo-Chemical Procedures in the Production of Adsorbents for Wastewater Treatment

Comparison of Microwave Assisted Thermo-Chemical Procedures in the Production of Adsorbents for Wastewater Treatment

Column Studies for the Simultaneous Removal of Phenol, Ammonia and Thiocyanate by the Adsorption with Steel Slag

Effect of H3PO4 and KOH as the Activating Agents on the Synthesis of Low-Cost Activated Carbon from Duckweeds Plants

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