Adsorption of chlorinated hydrocarbons from air and aqueous solutions by carbonized rice husk

Imagawa, A.; Seto, R.; Nagaosa, Yukio

doi:10.1016/s0008-6223(00)00006-3

Cited by 23 publications

(11 citation statements)

References 6 publications

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“…A large value of b also implies that strong bonding of phenolnoccurred with Sorbent [7] . Similar observation have been reported of the sorption of phenol on; bentonite, organobentonite and palm seed coat activated carbon, and the sorption of antimony and cadmium on rice husk [2,4,6,16,17,21] . …”

Section: Adsorption Isothermssupporting

confidence: 87%

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Potential of Rice Husk and Rice Husk Ash for Phenol Removal in Aqueous Systems

Mahvi¹,

Maleki²,

Eslami³

2004

American J. of Applied Sciences

171

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Abstract:The potential of rice husk and rice husk ash for phenol adsorption from aqueous solution was studied. Batch kinetics and isotherm studies were carried out under varying experimental conditions of contact time, phenol concentration, adsorbent dose and pH. Adsorption equilibrium of rice husk and rice husk ash was reached within 6 hours for phenolic concentration 150-500 µg/L and 3 hours for phenol concentration 500-1300 µg/L, respectively. Kinetics of adsorption obeyed a firstorder rate equation. The adsorption of phenol increases with increasing the solution pH value. The suitability of the Freundlich and Langmuir adsorption models of the equilibrium data was investigated for each phenol-sorbent system. The results showed that the equilibrium data for all the phenol-sorbent systems fitted the Freundlich model best within the concentration range studied. A comparative study showed that rice husk ash is very effective than rice husk for phenol removal. The studies showed that the rice husk ash can be used as an efficient adsorbent material for removal of phenolic from water and wastewater.

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Section: Adsorption Isothermssupporting

confidence: 87%

“…Increasing the mass transfer driving force and therefore the rate at which phenol molecules pass from the bulk solution to the particle surface. This would result in higher phenol absorption [20,21] . On a relative basis, however, the percentage adsorption of phenol decreases ( Fig.…”

Section: Effect Of Initial Phenol Concentrationmentioning

confidence: 99%

Potential of Rice Husk and Rice Husk Ash for Phenol Removal in Aqueous Systems

Mahvi¹,

Maleki²,

Eslami³

2004

American J. of Applied Sciences

171

View full text Add to dashboard Cite

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“…It is also evident that the adsorption capacity of the sorbent is increased with the increasing phenol concentration while the adsorption yields of phenol showed the opposite trend. It is probably due to increase in mass transfer driving force and therefore the rate at which phenol molecules pass from the bulk solution to the particle surface (Caturla et al 1998;Imagawa et al 2000). The experimental data and ANN-calculated output is found to be nicely matched (Fig.…”

Section: Effect Of Initial Phenol Concentrationmentioning

confidence: 68%

Neural network model and isotherm study for removal of phenol from aqueous solution by orange peel ash

et al. 2014

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Artificial Neural Network model and isotherm study were done to predict the removal efficiency of phenol. An inexpensive adsorbent was developed from orange peel ash (OPA) for effective uptake of phenol from aqueous solution. The influence of different experimental parameters (initial concentration, pH, adsorbents dose, contact time, stirring rate and temperature) on phenol uptake efficiency was evaluated. Phenol was adsorbed by the OPA up to maximum of 97.34 %. Adsorption of phenol on OPA correlated well with the Langmuir isotherm model, implying monolayer coverage of phenol onto the surface of the adsorbent. The maximum adsorption capacity was found to be 3.55 mg g -1 at 303 K. Pseudo-second-order kinetic model provided a better correlation for the experimental data. Moreover, the activation energy of the adsorption process (E a ) was found to be -18.001 kJ mol -1 indicating physorption nature of phenol onto OPA. A negative enthalpy (DH°) value indicated that the adsorption process was exothermic. Again multi-layer Neural Network model was in very good agreement with the experimental results.

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“…When the initial concentration of dye increases from 10 to 100 mg/l, the capacity of adsorbent increases from 9.92 to 84.32 mg/g. This fact can be interpreted so that by increasing the concentration of the dye, flow rate of mass transfer and as a result, driving force of dye molecules from solution to the adsorbent surrounding liquid layer, and Iran J Health Sci 2016; 4(2): 66 finally to the adsorbent particle surface increase (41,42). In other words, increasing the absorption capacity is attributed to the increased collision between dye molecules and adsorbent, as well as the increase of concentration gradient and the acceleration of the mass transfer.…”

Section: The Effect Of Initial Dye Concentration and Temperaturementioning

confidence: 99%

Direct Blue 71 Removal from Aqueous Solutions by Adsorption on Pistachio Hull Waste: Equilibrium, Kinetic and Thermodynamic Studies

et al. 2016

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Background and Purpose: Azo dyes including Direct Blue 71 (DB71) are toxic, mutagenic and carcinogenic contaminants in effluents of industries. This study aimed to investigate the adsorption of DB71 from aqueous solution onto pistachio hull waste (PHW) as a low-cost adsorbent. Materials and Methods:A series of experiments were performed via batch adsorption technique to examine the effect of the process variables such as contact time 0-210 minutes, initial dye concentration 10-100 mg/l, pH 2-12, adsorbent 0.05-1 g/l, and the processing temperature of 25, 40, and 50° C. The concentration changes of DB71 were measured using the colorimetric method by the spectrophotometer T80 ultraviolet/visible at the 587 nm wavelength. Moreover, The PHW was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, Freundlich and Langmuir isotherm model, pHpzc and Brunauer-Emmett-Teller (BET) surface area analysis.Results: Maximum adsorption capacity was 90.48 mg DB71 per 1 g adsorbent at pH 2, DB71 100 mg/l, temperature 50° C, and time 210 minutes. In general, by increasing the adsorbent dosage, time, and processing temperature, the removal efficiency was increased; however, incrementing pH and dye concentration had a reverse effect. Maximum BET specific surface and total pore volume on the adsorbent were 1.04 m 2 /g and 0.0002 cm 3 /g, respectively. The Freundlich isotherm (R 2 = 0.9912) model fits the equilibrium data better than the Langmuir isotherm (R 2 = 0.9024) model. The adsorption kinetic was found to be well described by the pseudo-second-order model. Thermodynamic analysis indicated that the adsorption process is a spontaneous and endothermic process. Conclusion:PHW can be used well as a low-cost surface adsorbent in the treatment of DB71 from aquatic environments.

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Adsorption of chlorinated hydrocarbons from air and aqueous solutions by carbonized rice husk

Cited by 23 publications

References 6 publications

Potential of Rice Husk and Rice Husk Ash for Phenol Removal in Aqueous Systems

Potential of Rice Husk and Rice Husk Ash for Phenol Removal in Aqueous Systems

Neural network model and isotherm study for removal of phenol from aqueous solution by orange peel ash

Direct Blue 71 Removal from Aqueous Solutions by Adsorption on Pistachio Hull Waste: Equilibrium, Kinetic and Thermodynamic Studies

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