Heavy metal removal by clinoptilolite. An equilibrium study in multi-component systems

Petrus, R.; Warchoł, J.

doi:10.1016/j.watres.2004.12.003

Cited by 126 publications

(67 citation statements)

References 31 publications

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“…Sorption of metal ions in such systems is the problematic issue. In the literature there are several approaches to this subject for natural and synthetic sorbents: clinoptilolite [7]; montmorillonite [8,9]; mordenite [10]; synthetic resin [11,12] but the results of mathematical modelling are not satisfactory. For that possibility of using artificial neural networks to describe the sorption equilibrium in multicomponent systems is proposed in this paper.…”

Section: The Study Of the Sorption Equilibriummentioning

confidence: 99%

Application of ANN to the Sorption Equilibrium Modelling of Heavy Metal Ions on Clinoptilolite

Tomczak¹,

Kamiński²

2012

Ecological Chemistry and Engineering S

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Abstract:The latest achievements in the field of mathematical modelling include the application of artificial neural networks (ANN). A growing interest in the ANN is confirmed by the number of publications devoted to the applicability of ANN in chemical, process and environmental engineering. A recent dynamic development of ANN provided an efficient and universal tool that is used to solve many tasks, including modelling, approximation and identification of objects. The initial step of applying the network to a given process consists in the determination of weights of the proposed neural network structure. This is performed on the basis of training data. A network that is properly trained allows correct information to be obtained on the basis of other data which have not been used in the network training. In most cases the network training is performed on the basis of a known mathematical model. However, the training of a network can be also performed using experimental data. In this paper, the sorption isotherms were predicted by means of a multilayer perceptron (MLP). Calculations were made using a training program written in Matlab, which took advantage of the Lavenberg-Marquardt procedure. In the last decade a growing interest is observed in inexpensive and very cheap adsorbents to remove heavy metal ions. Clinoptilolite is the mineral sorbent extracted in Poland used to remove heavy metal ions from diluted solutions. Equilibrium experiments were carried out to estimate sorptivity of a clinoptilolite and its selectivity towards Cu(II), Zn(II) and Ni(II) ions for multicomponent solution. Calculations with the use of MLP enabled description of sorption isotherms for one, two and three ions which were present at the same time in the solution. The network also enabled an analysis of sorption of the single ion, taking into account the effect of its concentration.

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Section: The Study Of the Sorption Equilibriummentioning

confidence: 99%

Application of ANN to the Sorption Equilibrium Modelling of Heavy Metal Ions on Clinoptilolite

Tomczak¹,

Kamiński²

2012

Ecological Chemistry and Engineering S

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“…Nowadays for removing of dissolved heavy metals the numerous processes, including ion exchange, precipitation, phytoextraction, ultrafiltration, reverse osmosis and electrodialysis exist [3]. Among them, ion exchange techniques using solid adsorbents is a promising method for treating wastewater, owing to its advantages such as operational simplicity, low cost, availability in large amount and ability to treat pollutants in a sufficiently large scale operation [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, ion exchange techniques using solid adsorbents is a promising method for treating wastewater, owing to its advantages such as operational simplicity, low cost, availability in large amount and ability to treat pollutants in a sufficiently large scale operation [3,4]. The use of sorbents based on natural, synthetic and modified alumosilicates can serve as a base for new technology development of heavy metal adsorption.…”

Section: Introductionmentioning

confidence: 99%

Modified Raw Materials: Synthesis, Characterization and Application for Cd<sup>2+</sup> Ions Removal

Seilkhanova¹,

Imangaliyeva²,

Akbayeva³

et al. 2017

Studia UBB Chemia

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ABSTRACT. The adsorption behavior of some lowcost adsorbents such as bentonite, meal thistle and carbonized walnut husk with respect to Cd 2+ ions in aqueous solutions has been studied. The several process parameters (contact time, initial metal concentration, sorption capacity, extraction degree, rate constants, sorption rates and sorption energy) were found. For the Cd 2+ ions adsorption the equilibrium time onto bentonite, meal thistle and carbonized walnut husk were found to be 2 h, 25 and 10 min, respectively. Adsorption parameters were determined using both Langmuir and Freundlich isotherms. Sorption isotherms of cadmium ions onto MBT (modified bentonite) and MTM (modified thistle meal) were the best of all described by the equation of Freundlich sorption (correlation coefficients are closest to unit). In contrast the sorption of Cd 2+ ions onto MCWH (modified carbonized walnut husk) was described by the Langmuir isothermic model where the adsorption occurs on homogeneous surface by monolayer sorption without interaction between sorbed ions. The obtained results demonstrate that bentonite, meal thistle and carbonized walnut husk can remove Cd 2+ ions from aqueous solutions. It means that cheap and available raw materials can be efficient adsorbents and capable to remove cationic heavy metal species from waste water. The ion-exchange mechanism of adsorption of cadmium ions by the MBT, MTM, MCWH was proposed.

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“…It has been reported that many industries discharge untreated effluents into river and only 10 % industries surveyed had primary treatment ranging from oxidation tanks, sedimentation tanks in developing countries [4][5][6]. Heavy metals from industrial processes are of special concern because they produce chronic poisoning in aquatic animals [7][8].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Contamination Through Industrial Effluent to Irrigation Water in Gadoon Amazai (Swabi) and Hayatabad (Peshawar) Pakistan

et al. 2013

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Industrial effluents mixed water used for irrigation in vegetable growing area was tested for its heavy metal contents using Atomic Absorption Spectrophotometry. The overall metal concentration in the studied samples was in the order of Fe>Pb>Cu>Mn>Co>Zn>Cr>Ni (p < 0.05). pH was in the range of 3.1-8.7 and electrical conductivity was 325 to 1515 ms/cm. As all values were found to be increasing towards pollution limits, industrial effluents need a continuous monitoring and proper management before their discharge in order to reduce the future hazards in reference to aquatic and human life.

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Heavy metal removal by clinoptilolite. An equilibrium study in multi-component systems

Cited by 126 publications

References 31 publications

Application of ANN to the Sorption Equilibrium Modelling of Heavy Metal Ions on Clinoptilolite

Application of ANN to the Sorption Equilibrium Modelling of Heavy Metal Ions on Clinoptilolite

Modified Raw Materials: Synthesis, Characterization and Application for Cd<sup>2+</sup> Ions Removal

Heavy Metals Contamination Through Industrial Effluent to Irrigation Water in Gadoon Amazai (Swabi) and Hayatabad (Peshawar) Pakistan

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