The Adsorption of Pentachlorophenol (PCP) on Aerobic Granules

2012 ◽  
Vol 599 ◽  
pp. 354-357
Author(s):  
Hui Xia Lan ◽  
Xiao Feng Liu ◽  
Rui Chen ◽  
Heng Zhang
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Isotherms ◽  
Adsorption Behavior ◽  
Dynamic State ◽  
Aerobic Granules ◽  
Langmuir Adsorption ◽  
Static Adsorption ◽  
Freundlich Adsorption Isotherm

the adsorption of PCP using aerobic granules was studied. The static adsorption experiments were carried out and the Freundlich and Langmuir adsorption isotherms were applied to describe the biosorption processes and the isotherm constants were evaluated. The Freundlich and Langmuir isothermy adsorption equations obtained from the static experients were q=2.04ce0.82 and q=3.47ce /(1+0.56 ce), respectively. Both the adsorption isotherms described the static adsorption behavior of PCP well. Then the Freundlich adsorption isotherm was used to estimate the adsorption of PCP by aerobic granules in the dynamic state. The results showed that the adsorption mainly occurred in the initial periods during the operation of the reactor.

The Investigation of Dyeing Properties of Anion Modified Linen Fibers

2012 ◽  
Vol 535-537 ◽  
pp. 1605-1608 ◽  
Author(s):  
Shu Zhen Gao ◽  
Qun Liu
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Isotherms ◽  
Sodium Periodate ◽  
Langmuir Adsorption Isotherm ◽  
Sodium Bisulfite ◽  
Cationic Dyes ◽  
Dyeing Properties ◽  
Langmuir Adsorption

Linen fibers oxidated by sodium periodate were anion-modified with sodium bisulfite, and treated linen fibers were dyed with cationic dyes. The thermodynamics principle of dyeing on modified linen fibers has been investigated by means of drawing adsorption isotherms,calculating dyeing saturation value and measuring dyeing levelness. The results indicate that adsorption isotherm of dyeing modified linen fibers with cationic dyes belongs to Langmuir adsorption isotherm,and the levelness of modified linen fabrics was better, the results indicate that the function of modification agent on linen fibers were more comprehensive and balanced.

scholarly journals Aplikasi Zeolit Alam Aktif Wonosari Sebagai Adsorben Zat Warna Remazol Yellow Fg

2021 ◽  
Vol 1 ◽  
pp. 80-87
Author(s):  
Neni Damajanti ◽  
Anwar Ma’ruf ◽  
Hanafi Khafid Nugraha
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Textile Industry ◽  
Contact Time ◽  
Langmuir Adsorption Isotherm ◽  
Isotherm Model ◽  
Isotherm Models ◽  
Activation Process ◽  
Langmuir Adsorption ◽  
Freundlich Adsorption Isotherm

Zeolite as an adsorbent has been widely used. Zeolite activation was carried out to increase the absorption. This study aimed to determine the characteristics of the active zeolite and apply it as an adsorbent. The activation process was carried out by adding acid and calcining at 4500C for 6 hours. Remazol Yellow FG is a dye that is widely used in the textile industry. In this study, the adsorption process was carried out on the Remazol Yellow FG solution, then analyzed the effect of changes in pH (5, 6, 7, 8, 9), contact time (30, 60, 90, 120, 150 minutes) and the concentration of Remazol Yellow FG solution ( 50, 100, 150, 200, 250 ppm) on the adsorption of Remazol Yellow FG dye. From the analysis of the sample solution of Remazol Yellow, the values of Ce and qe can be calculated. These values were then used to calculate KL and KF in the Langmuir adsorption isotherm and Freundlich adsorption isotherm models. From the experimental results, it could be seen that as the contact time increased, the adsorption capacity would be greater. However, when the zeolite was already in the saturated phase, the adsorption capacity would tend to decrease. In the Langmuir adsorption isotherm, the KL value was 0.0274 L/mg and in the Freundlich adsorption isotherm model, the KF value was 29.25 L/mg. Remazol Yellow FG adsorption tended to follow the Langmuir adsorption isotherm model with an R2 value of 0.998.

The Adsorption Behavior of Thiazole on the Surface of Carbon Steel in Heterogeneous Solution

2014 ◽  
Vol 1010-1012 ◽  
pp. 1740-1744
Author(s):  
Jun Zhe Ai
Keyword(s):  
Carbon Steel ◽  
Adsorption Isotherm ◽  
Inhibition Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Behavior ◽  
Nacl Solution ◽  
Langmuir Adsorption ◽  
Potentiodynamic Polarization Curves ◽  
Electrochemical Parameters ◽  
Spontaneous Behavior

The adsorption behavior of thiazole inhibitior on the surface of N80 carbon steel was studied by potentiodynamic polarization curves in heterogeneous NaCl solution at pH=4. The electrochemical parameters were fitted. The result shows that thiazole inhibitor is of anodic adsorption, and the inhibition efficiency increases with the concentration increasing (4.9×10-4~1.9×10-3mol/L), but decreases with the temperature increasing (30~60°C). The thermodynamics of this adsorption was also discussed. The result is shown that the adsorption is according with Langmuir adsorption isotherm formula in acidic condition, and adsorption is a spontaneous behavior.

scholarly journals Surface Flocculation as a New Tool for Controlling Adsorption Processes

2002 ◽  
Vol 20 (9) ◽  
pp. 883-896 ◽  
Author(s):  
Miloslav Milichovský ◽  
Bretislav Češek
Keyword(s):  
Aqueous Solution ◽  
Reaction Mechanism ◽  
Adsorption Isotherm ◽  
Adsorption Isotherms ◽  
Colloidal Particles ◽  
Langmuir Adsorption Isotherm ◽  
Cellulose Fibres ◽  
Langmuir Adsorption ◽  
Low Degree ◽  
Adsorption Processes

The dyeing of modified pulp, particularly with regard to the mechanism involved, was studied. The reaction mechanism for the modification of cellulose fibres in aqueous solution by cationic agents was also described. The results obtained were expressed in the form of adsorption isotherms. The capture of molecules, colloidal particles, etc. during the adsorption processes involving modified pulp could be explained by two possible mechanisms: (i) aggregation (coagulation or flocculation) in solution followed by adsorption and (ii) surface aggregation (coagulation or flocculation). Surface aggregation appeared to be the most likely for pulp with a low degree of modification. The typical Langmuir adsorption isotherm correlated the data obtained for unmodified pulp very well.

Study on Arsenic Removal Efficiency and Mechanism of Titanium Modified Manganese Ore

2011 ◽  
Vol 356-360 ◽  
pp. 1061-1065
Author(s):  
Yong Bing Huang ◽  
Xiu Ying Liu ◽  
Li Li Wang ◽  
Xiao Juan Li ◽  
Shu Xin Tu
Keyword(s):  
Adsorption Isotherm ◽  
Removal Efficiency ◽  
Arsenic Removal ◽  
Low Cost ◽  
Manganese Ore ◽  
Langmuir Adsorption ◽  
Freundlich Adsorption Isotherm ◽  
Adsorption Quantity ◽  
Modification Condition ◽  
Dipping Time

Natural manganese ore is a kind of arsenic removal mineral. It is low-cost and widely available. In order to enhance its removal efficiency and adsorption quantity of arsenic, this paper adopted TiCl4 to modify natural manganese ore and optimized the conditions of modification. The results showed that the best modification condition was: TiCl4 at a concentration of 10 mg•L-1, dipping time of 18h, pH 3.05, reaction time of 60 min; under these conditions, the removal rates of As (Ⅲ) and As (Ⅴ) respectively reached 94.87% and 99.31%, much higher compared with natural manganese ore (82.95% and 77.93%). The saturated adsorption quantity of As (Ⅲ) and As (Ⅴ) reached 3.48 mg•g-1 and 3.27 mg•g-1, each increasing 1.25 mg•g-1 and 1.21 mg•g-1. The adsorption of As (Ⅲ) by modified manganese ore fits the Freundlich adsorption isotherm, while As (Ⅴ) fits the Langmuir adsorption isotherm best.

INFLUENCE OF CATION SATURATION ON PHOSPHORUS ADSORPTION BY SELECTED CLAY MINERALS

1968 ◽  
Vol 48 (2) ◽  
pp. 151-157 ◽  
Author(s):  
A. Pissarides ◽  
J. W. B. Stewart ◽  
D. A. Rennie
Keyword(s):  
Adsorption Isotherm ◽  
Clay Minerals ◽  
Adsorption Isotherms ◽  
Divalent Cations ◽  
Relative Magnitude ◽  
Langmuir Adsorption Isotherm ◽  
Exchangeable Cations ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Adsorption Data

Three clay minerals, a kaolinite, an illite and a montmorillonite, were saturated with different cations (Li+, Na+, K+, Mg++, Ca++, Sr++, and Ba++) before equilibration with dilute phosphorus solutions. The phosphorus adsorption data conformed to the Langmuir adsorption isotherm. The relative magnitude of the phosphorus adsorption constants (b and k) could be qualitatively predicted from the type of exchangeable cations for any one clay mineral.The patterns of the adsorption isotherms and adsorption constants, b and k, can be explained on the basis of P adsorption at the edges of the clay minerals; the possibility of precipitation of the phosphorus with divalent cations or aluminum in solution was considered but rejected.

Adsorption of 4-Chlorophenol onto Hypercrosslinked Resins

2011 ◽  
Vol 356-360 ◽  
pp. 298-302
Author(s):  
Shu He Tang ◽  
Jing Ping Wang ◽  
Yu Feng Sun ◽  
Nan Nan Dai
Keyword(s):  
Free Energy ◽  
Adsorption Isotherm ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Equilibrium Adsorption ◽  
Experimental Investigations ◽  
Static Adsorption ◽  
Adsorption Data ◽  
Freundlich Adsorption Isotherm ◽  
Better Than

Two kinds of hypercrosslinked resin ZH-01 and ZH-03 were prepared in this study. Experimental investigations were conducted to study the adsorption characteristics of 4-chlorophenol on the hypercrosslinked resins by method of static adsorption. The equilibrium adsorption data was fitted to Freundlich adsorption isotherm model to evaluate the related parameters. The results showed that the changes of enthalpy, free energy, entropy indicate an exothermic, spontaneous and disorder decreasing process happened in the adsorption. It was also shown that, respecting to the adsorption capacity, the adsorbents prepared here are better than the Amberlite XAD-4 for removing the 4-chlorophenol in aqueous solutions.

scholarly journals Diffusion of calcium ions in retinal rods. A theoretical calculation.

1981 ◽  
Vol 77 (4) ◽  
pp. 475-487 ◽  
Author(s):  
S McLaughlin ◽  
J Brown
Keyword(s):  
Diffusion Coefficient ◽  
Adsorption Isotherm ◽  
Calcium Ions ◽  
Outer Segment ◽  
Effective Diffusion ◽  
Langmuir Adsorption Isotherm ◽  
Diffuse Double Layer ◽  
Langmuir Adsorption ◽  
Retinal Rods ◽  
Disk Membrane

The Fick diffusion equation is combined with the Langmuir adsorption isotherm and the relevant equations from the Gouy-Chapman theory of the electrical diffuse double layer to demonstrate that the effective diffusion coefficient of calcium ions, both in the cytoplasm of the rod outer segment and within the aqueous space bounded by the disk membrane, should be reduced by a factor of 10-100 because these ions adsorb to phospholipids present in the disk membrane.

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