2,4-Dichlorophenoxyacetic acid adsorption on adsorbent prepared from groundnut shell: Effect of preparation conditions on equilibrium adsorption capacity

The new adsorption material was prepared by grafting the larch tannin onto aminated silica beads with the glutaraldehyde as the cross-linking agent. The adsorption properties of Pr3+and Nd3+on the new adsorbent material in aqueous solution were investigated. The results showed that the equilibrium adsorption capacities of this adsorbent to Pr3+, Nd3+were 402.12mg/g, 305.43mg/g at 303K when the initial concentrations of each ions were 442.7mg/L, 432.6mg/L, respectively and the pH value was 5.5; the maximum adsorption quantities of each ions were 576.34mg/g, 497.02mg/g at 303K when the initial concentrations of each ions were 704.5mg/L, 721.0mg/L, respectively and the pH value was 5.5. The effect of pH value was significant to the equilibrium adsorption capacity, the optimum pH values of this material to Pr3+and Nd3+were both 5.5; while the effect of the temperature was not obvious to the equilibrium adsorption capacity. The adsorption thermodynamics meet Freundlich equation, and the adsorption kinetics data of this adsorbent to Pr3+, Nd3+fitted with the pseudo-second-order rate equation dynamics model.

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Kinetics of Phenol Removal from Aqueous Solution by Adsorption onto Peanut Shell Acid-Activated Carbon

Adsorption Science & Technology ◽

10.1260/0263617054770011 ◽

2005 ◽

Vol 23 (4) ◽

pp. 289-302 ◽

Cited By ~ 17

Author(s):

Elio E. Gonzo ◽

Luis F. Gonzo

Keyword(s):

Activated Carbon ◽

Adsorption Capacity ◽

Rate Constant ◽

Equilibrium Adsorption ◽

Phenol Removal ◽

Peanut Shell ◽

Pseudo Second Order ◽

Equilibrium Adsorption Capacity ◽

Initial Adsorption ◽

Initial Adsorption Rate

A pseudo-second-order rate equation describing the kinetic adsorption of phenol onto peanut shell acid-activated carbon at different initial concentrations, carbon dosages and particle sizes has been developed. The adsorption kinetics were followed on the basis of the amount of phenol adsorbed at various time intervals at 22°C. The rate constant and the equilibrium adsorption capacity were calculated. From these parameters, empirical correlations for predicting the equilibrium adsorption capacity as a function of the C0/D ratio, and for estimating the rate constant as a function of the relation D/(C0dp)0.5, were derived. This allowed a general rate expression for design purposes to be obtained which was valid for C0/D ≤ 1.5. The operation line for each case studied was constructed and the equilibrium adsorption capacity obtained. A comparison was undertaken with the experimental adsorption isotherm as previously determined. The effect of the initial phenol concentration, the carbon dose and the particle size on the initial adsorption rate was also analyzed.

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Synthesis and adsorption property of hydrophilic–hydrophobic macroporous crosslinked poly(methyl acryloyl diethylenetriamine)/poly(divinylbenzene) (PMADETA/PDVB) interpenetrating polymer networks (IPNs)

RSC Advances ◽

10.1039/c5ra00176e ◽

2015 ◽

Vol 5 (34) ◽

pp. 26616-26624 ◽

Cited By ~ 14

Author(s):

Hebing Li ◽

Zhenyu Fu ◽

Li Yang ◽

Chong Yan ◽

Limiao Chen ◽

...

Keyword(s):

Salicylic Acid ◽

Adsorption Capacity ◽

Adsorption Property ◽

Polymer Networks ◽

Interpenetrating Polymer Networks ◽

Equilibrium Adsorption ◽

Equilibrium Adsorption Capacity

A novel hydrophilic–hydrophobic PMADETA/PDVB IPNs possesses a large equilibrium adsorption capacity to salicylic acid.

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Theoretical Study for an Adsorption Refrigerator

Solar Energy and Sustainable Development ◽

10.51646/jsesd.v8i1.24 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Abdulghani M. Ramadan

Keyword(s):

Adsorption Capacity ◽

Waste Heat ◽

Cooling System ◽

Operating Conditions ◽

Equilibrium Adsorption ◽

Design Parameters ◽

Low Grade ◽

Equilibrium Pressure ◽

Study Results ◽

Equilibrium Adsorption Capacity

Adsorption cooling technology is one of the effective means to convert low grade thermal energy in to effective cooling, which improves energy efficiency and lowers environmental pollution. The main objective of this study is to investigate the thermal performance of an adsorption refrigerator theoretically. The working adsorbent/adsorbate pair used is Granular Activated Carbon, GAC/R134a pa*ir. The effect of different design parameters and operating conditions on the system performance is studied and interpreted.Some assumptions and approximations are also considered. A computer program is written using Matlab. Results show that the equilibrium adsorption capacity is highly affected by the driving temperature and equilibrium pressure. Increasing equilibrium pressure leads to a corresponding increase in the equilibrium adsorption capacity whereas it is value is decreased as the driving temperature increases. Moreover, increasing the driving and evaporator temperatures raise the values of the Specific Cooling Effect (SCE) andCoefficient of Performance (COP). The maximum values of SCE and COP are 60 KJ/kg and 0.4 corresponding to driving and evaporator temperatures of 100 oC and 20 oC respectively. However, increasing the condenser temperature leads to a remarked decrease in SCE and COP of the cooling system. SCE and COP values are 32 KJ/kg and 0.22 at driving and condenser temperatures of 100 oC and 40 oC respectively. When comparing the present study results with literature, there is a good agreement in general. It is clear that the adsorption cooling system can be driven effectively by low grade heat sources such as, solar energy, waste heat energy, geothermal energy…etc.

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Adsorption mechanism and modelling of hydrocarbon contaminants onto rice straw activated carbons

Polish Journal of Chemical Technology ◽

10.2478/pjct-2019-0032 ◽

2019 ◽

Vol 21 (4) ◽

pp. 1-12

Author(s):

Mahmoud M. Abdel daiem ◽

Manuel Sánchez-Polo ◽

Ahmed S. Rashed ◽

Nehal Kamal ◽

Noha Said

Keyword(s):

Adsorption Capacity ◽

Rice Straw ◽

Pore Volume ◽

Adsorption Mechanism ◽

Volume Diffusion ◽

Activated Carbons ◽

Dichlorophenoxyacetic Acid ◽

Solution Ph ◽

Controlling Mechanism ◽

2,4 Dichlorophenoxyacetic Acid

Abstract The adsorption of Diphenolic acid (DPA), 2,4-Dichlorophenoxyacetic acid (2,4-D), and 2-methyl-4-chlorophenoxyacetic acid (MCPA) were examined in aqueous solution using activated carbon rice straw. The rice straw was activated by using two reagents, zinc chloride and phosphoric acid and named as RSZ, RSP, respectively. The results showed that both carbons have a relatively high adsorption capacity. Concerning the adsorption kinetic, the second-order model has better fit than the first model to experimental data. The adsorption yield of both carbons increased in the order: DPA < 2,4-D < MCPA. The pore volume diffusion model satisfactorily fitted the experiment on both carbons. Furthermore, solution pH has a high influence on the adsorption capacity for both carbons. The adsorption mechanism of selected pollutants onto carbon samples has been controlled by dispersion interaction π-π electrons and electrostatic interaction, moreover, the contribution of pore volume diffusion is the controlling mechanism of the overall rate of adsorption.

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Metal-polyethyleneimine-activated Carbon Interaction Parameter at Equilibrium Adsorption Capacity

Journal of Applied Sciences ◽

10.3923/jas.2010.1192.1195 ◽

2010 ◽

Vol 10 (12) ◽

pp. 1192-1195 ◽

Cited By ~ 3

Author(s):

C.Y. Yin ◽

M.K. Aroua ◽

W.M.A.W. Daud

Keyword(s):

Activated Carbon ◽

Adsorption Capacity ◽

Interaction Parameter ◽

Equilibrium Adsorption ◽

Equilibrium Adsorption Capacity

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Study on Adsorption Property of Different Adsorbents for Dibenzothiophenic Sulfur in Simulated Diesel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.2488 ◽

2013 ◽

Vol 807-809 ◽

pp. 2488-2491

Author(s):

Lei Tang ◽

Yang Yan Bian ◽

Qun Cui ◽

Hai Yan Wang

Keyword(s):

Adsorption Capacity ◽

Adsorption Property ◽

Metal Organic Framework ◽

Equilibrium Concentration ◽

Equilibrium Adsorption ◽

Bet Surface Area ◽

Initial Concentration ◽

Adsorption Performance ◽

Metal Organic ◽

Equilibrium Adsorption Capacity

It’s more difficult to remove dibenzothiophenic sulfur in diesel. Adsorption performance of self-made metal-organic framework on Cu-BTC, MCM-22, alumina and silica gel for 4-methyldibenzothiophene (4-MDBT) and 4,6-dimethyldibenzothiophene(4,6-DMDBT) in simulated diesel at room temperature were investigated. The results show, BET surface area of Cu-BTC is up to 1501m2/g. When the initial concentration of sulfur in 4-MDBT is 46.80mg S/L, the static equilibrium adsorption capacity of Cu-BTC for 4-MDBT in simulated diesel is 2.40mg S/gads, which is about 20 times than that of other adsorbents. When the initial concentration of sulfur in 4,6-DMDBT is 48.47mg S/L, the equilibrium adsorption capacity of Cu-BTC for 4,6-DMDBT in simulated diesel is 2.04mg S/gads. The adsorption isotherms of Cu-BTC for 4-MDBT and 4,6-DMDBT indicate that when the equilibrium concentration of sulfur is 50mg S/L, the adsorption performance of Cu-BTC for 4-MDBT and 4,6-DMDBT following the order is 4-MDBT>4,6-DMDBT.

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Study on the Properties of Fe3+ Sorption to SrZr4(PO4)6 Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.362 ◽

2013 ◽

Vol 634-638 ◽

pp. 362-366

Author(s):

Jin Yang ◽

Lin Hua Zhu ◽

Tian Si

Keyword(s):

Adsorption Capacity ◽

Room Temperature ◽

Adsorption Equilibrium ◽

Equilibrium Adsorption ◽

Equilibrium Time ◽

Optimum Dosage ◽

Equilibrium Adsorption Capacity

SrZr4(PO4)6 (SZP) materials were synthesized by precipitate method and dispersed by small molecular solvent. The properties of adsorption materials SZP to Fe3+ have been examined. The equilibrium adsorption indicated that the adsorption equilibrium time of SZP to Fe3+ was 16h at room temperature, and the equilibrium adsorption capacity was 0.318~0.924mg Fe3+/gSZP. The adsorption capacity of 60°C is less than 20°C’s. In addition, the optimum dosage of the SZP adsorbent was 3g , and the corresponding adsorption ratio is 50% .

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