Equilibrium uptake and sorption dynamics for the removal of a basic dye (basic red) using low-cost adsorbents

2003 ◽  
Vol 265 (2) ◽  
pp. 257-264 ◽  
Author(s):  
V.K Gupta ◽  
I Ali ◽  
Suhas ◽  
Dinesh Mohan
Keyword(s):  
Low Cost ◽  
Basic Dye ◽  
Sorption Dynamics

Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed

2012 ◽  
Vol 33 (1) ◽  
pp. 103-116 ◽  
Author(s):  
Elwira Tomczak ◽  
Władysław Kamiński
Keyword(s):  
Heavy Metal ◽  
Genetic Algorithms ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Water Solution ◽  
Low Cost ◽  
Breakthrough Curves ◽  
Process Conditions ◽  
Global Extremum ◽  
Sorption Dynamics

Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients β, KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.

Fluoride Removal from Water using Bio-Char, a Green Waste, Low-Cost Adsorbent: Equilibrium Uptake and Sorption Dynamics Modeling

2012 ◽  
Vol 51 (2) ◽  
pp. 900-914 ◽  
Author(s):  
Dinesh Mohan ◽  
Rupa Sharma ◽  
Vinod K. Singh ◽  
Philip Steele ◽  
Charles U. Pittman
Keyword(s):  
Low Cost ◽  
Fluoride Removal ◽  
Dynamics Modeling ◽  
Green Waste ◽  
Sorption Dynamics

Adsorption equilibria of basic dyestuff onto palm-fruit bunch particles

1995 ◽  
Vol 32 (11) ◽  
pp. 27-32 ◽  
Author(s):  
M. M. Nassar ◽  
M. F. Hamoda ◽  
G. H. Radwan
Keyword(s):  
Particle Size ◽  
Adsorption Isotherm ◽  
Low Cost ◽  
Palm Fruit ◽  
Basic Dye ◽  
Batch Tests ◽  
Adsorption Equilibria ◽  
Langmuir And Freundlich Models ◽  
Adsorbent Particle ◽  
Palm Bunch

Particles prepared from palm-fruit bunch have been used for the adsorption of a basic dye (BR 18) over range of initial dye concentrations and varying adsorbent particle size in the range of 106 to 300 m, using batch tests. The results revealed the potential for palm-bunch particles as low cost adsorbents. Uptake of the basic dye was higher at smaller adsorbent particle size. The adsorption isotherm follows both the Langmuir and Freundlich models. Values of the separation factor, R, indicate favourable for the basic dye - palm fruit bunch particles system, that is, 0< R <1 and Freundlich constant n >1.

scholarly journals Use of Forestry Wastes for Biosorption of Dyes and Cr (VI)

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Nariye Berraksu ◽  
Ebru Mavioglu Ayan ◽  
Jale Yanik
Keyword(s):  
Low Cost ◽  
Langmuir Model ◽  
Adsorption Ability ◽  
Electrostatic Adsorption ◽  
Biosorption Capacity ◽  
Basic Dye ◽  
Pine Cone ◽  
Adsorption Capacities ◽  
Basic Dyes ◽  
Attractive Candidate

The pine cone and oak cups pulp were used as low-cost adsorbents for the removal of basic (Basic Red 18) and acidic (Acid Red 111) dyes and Cr (VI) from aqueous solutions. The adsorbents were modified by HNO3to improve their biosorption capacity. The adsorbents were characterized using scanning electron microscopy and FTIR spectroscopy. The zeta potential was determined as a function of the pH, in order to explain the effect of pH on electrostatic adsorption ability of biosorbent. Modification of adsorbents with nitric acid led to an increase in accessibility of some functional groups on the surface or a decrease in negativity of surface charge. The modification of pine cone increased its adsorption capacity for the basic dye, whereas the modification of oak cups pulp decreased the adsorption ability for basic dye to some extent. The adsorption isotherms fitted the Langmuir model. The adsorption capacities were found to be 142.85, 158.73, and 156.20 mg g-1 for modified and raw pine cone and oak cups pulp, respectively. The acidic dye and Cr (VI) adsorptions were much lower compared to basic dye on all tested adsorbents. The results indicated that the forest wastes (pine cone and oak cups pulp) were an attractive candidate for basic dyes from aqueous solution.

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