Influence of Zeolite Transformation in a Homoionic Form on the Removal of Some Heavy Metal Ions from Wastewater

Panayotova, Marinela; Velikov, Borislav

doi:10.1081/ese-120016916

Cited by 45 publications

(27 citation statements)

References 13 publications

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“…During the mechanical treatment, bulk samples were milled to the desired grain size (0.2 -0.4 mm) and then washed in order to remove fine particles from the grain surface, while throughout the acidic treatment (HCl 1M) zeolitic volcanic tuff channels are cleared and pores opened. To bring the zeolitic volcanic tuff in -Na form, which proved to be more efficient in the ionic exchange process (Iovi et al, 1993;Mondale et al, 1995;Cobzaru et al, 2002;Panayotova and Velikov, 2003), the samples were further subjected subsequently to an alkaline treatment (NaCl 1M, pH = 10 with NaOH).…”

Section: Znmentioning

confidence: 99%

“…For example, clinoptilolite, which is the most abundant natural zeolite (Italy, Croatia, Turkey, Greece, and Romania) was shown to be an efficiently remover of NH (Ouki and Kavannagh, 1997;Langella et al, 2000;Cincotti et al, 2001;Badillo-Almaraz et al, 2003;Panayotova and Velikov, 2003;Erdem et al, 2004;Peric et al, 2004;Top and Ulku, 2004;Bedelean et al, 2006;Stanca et al, 2006;Burcă et al, 2008). Clinoptilolite can also be used as an amendment to sewage sludge or soil in order to stabilize the heavy metal ions and to prevent their entering in the ecosystem by leaching (Zorpas et al, 2000a(Zorpas et al, , 2000b(Zorpas et al, , 2002Moirou et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Investigations on some zeolitic volcanic tuffs from Cluj County (Romania), used for zinc ions removal from aqueous solution

Bedelean¹,

Măicăneanu²,

Burcă³

et al. 2010

Studia UBB, Geologia

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ABSTRACT. Representative samples of zeolitic tuffs from Măcicaş, Aluniş, and Apahida occurrences (Cluj County, Romania) were investigated using optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and wet chemical analyses. The studied tuff samples are represented mainly by vitric and vitric crystal varieties. The mineral assemblage suggests a rhyodacitic volcanic tuff. Diagenetic alteration led to the formation of zeolites, mainly clinoptilolite. Zn 2+ removal was performed on some bulk samples: Aluniş (labelled A1), Apahida (Ap), and Măcicaş (M2) grain size of 0.2-0.4 mm. Each sample was chemically modified with HCl 1M (Z-H form) and NaCl + NaOH 1M pH = 10 (Z-Na form). The ionic exchange experiments were performed in a batch reactor (immobile phases) and in a fixed bed column. Ionic exchange efficiencies for the samples considered are presented for static and dynamic regimes. Removal efficiencies higher than 53.97% and exchanged Zn 2+ quantities higher than 1.05 mg/g were obtained. Therefore, the zeolitic tuffs under investigation are considered to be active in the ionic exchange process and can be used in wastewaters treatment to remove Zn 2+ ions. The results for all the samples considered in batch and fixed bed experiments are presented by means of cation exchange capacity (CEC) and removal efficiency.

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Section: Znmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations on some zeolitic volcanic tuffs from Cluj County (Romania), used for zinc ions removal from aqueous solution

Bedelean¹,

Măicăneanu²,

Burcă³

et al. 2010

Studia UBB, Geologia

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“…In order to remove toxic heavy metals from water systems, conventional methods have been used such as chemical precipitation, coagulation, ion exchange, solvent extraction and filtration, evaporation and membrane methods [19]. These conventional treatment technologies for the removal of these toxic heavy metals are not efficient and generate huge quantity of toxic sludge.…”

Section: Introductionmentioning

confidence: 99%

“…Further, reuse of water after removal of contaminants, whether pharmaceuticals or otherwise, is required by industry and agriculture. In view of the scarcity of water resources, it is necessary to understand and develop methodologies for treatment of pharmaceutical wastewater as part of water management.In order to remove toxic heavy metals from water systems, conventional methods have been used such as chemical precipitation, coagulation, ion exchange, solvent extraction and filtration, evaporation and membrane methods [19]. These conventional treatment technologies for the removal of these toxic heavy metals are not efficient and generate huge quantity of toxic sludge.…”

mentioning

confidence: 99%

Evaluation of Absorption Process for Heavy Metals Removal found in Pharmaceutical Wastewater

Radaideh¹,

Abdulgader²,

Barjenbruch³

2017

J Med Toxicol Clin Forensic

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This study focused on the adsorption/absorption process of natural volcanic tuff, its application, kinetics, efficiency, velocity and selectivity order in removing heavy metals found in pharmaceutical wastewater.Series of experiments were conducted in batch-wise and fixed-bed columns to study the removal performance and selectivity sequence of mixed metal ions (Pb ) in aqueous solution using natural volcanic tuff material as adsorbent. The main purpose of this study is to highlight the economical application of the method in treatment of pharmaceutical wastewater.Heavy metal salts were used to prepare synthetic pharmaceutical wastewater containing a mixture of different metal ions concentrations ranged from 1 to 20 mg/L were to be applied to columns packed with natural volcanic tuff rich in zeolite ranged between (0.50-3.50 mm ) in grain size. Photometric procedure was used for sample analysis. The absorption experiments were carried out under changing conditions, different pH-values (2, 4, 6 and 7), initial solute concentrations (1, 5 and 10) mg/L, different temperatures (10, 20 and 30°C) and varying tuff particle sizes (0.50-3.50) mm.The results showed that Freundlich model described satisfactorily sorption of Cu 2+ and Fe 2+. Used volcanic tuff exhibit efficiency in removing heavy metals ranging from 45-99% of the added Cr, Cu, Zn, Pb and Fe metal concentrations, respectively. According to the percentage sorption and distribution coefficients values, the selectivity sequence of studied metals by volcanic tuff is strongly dependent of pH, however approximating all results a selectivity sequence can be given as Pb ≥ Fe>Cr>Zn>Cu at pH around 2 and a selectivity sequence as Fe>Cu>Cr>Zn>Pb at pH=6-7. The result confirms that natural volcanic tuff hold great potential to remove cationic heavy metal species from industrial wastewater. of heavy metals, much attention has been paid for occurrence, concentrations, movement, fate and the anticipated health and environmental risks that may arise from these heavy metals since they have direct exposure to humans and other organisms [8,9]. The demand for pharmaceuticals has resulted in a consequent increase in pharmaceutical manufacturing companies in the world and hence increased pharmaceutical waste which most times contain substantial amount of heavy metals. Pharmaceutical residues in the environment, and their potential toxic effects, have been recognized as one of the emerging research area in the environmental chemistry [10,11]. Pharmaceutical effluents are usually discharged into the environment and when improperly handled and disposed, they affect both human health and the environment [12,13]. KeywordsThe presence of pharmaceutical compounds in waters comes from two different sources: production processes of the pharmaceutical industry and common use of pharmaceutical compounds resulting in their presence in urban wastewaters [14][15][16][17]. The pharmaceutical wastewaters generated in different processes in the manufacture of pharmaceuticals and drugs cont...

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“…Chemical conditioning also causes exchangeable ions that are already within the zeolite to be more accessible, contributing to the efficient performance of the zeolite. The finally conditioned zeolite should have improved effective ionexchange capability (Bremner and Schultze, 1995;Gradev et al, 1988;Panayotova and Velikov, 2003).…”

Section: Introductionmentioning

confidence: 99%

The effect of conditioning with NaCl, KCl and HCl on the performance of natural clinoptilolite’s removal efficiency of Cu<sup>2+</sup> and Co<sup>2+</sup> from Co/Cu synthetic solutions

Mamba¹,

Nyembe²,

Mulaba‐Bafubiandi³

2010

WSA

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Southern African clinoptilolite's capability as an ion-exchanger with respect to Cu 2+ and Co 2+ was investigated in order to consider its viability in the removal of metal cations from aqueous solutions. The effect of chemical conditioning was investigated using sodium chloride (NaCl), hydrochloric acid (HCl) and potassium chloride (KCl). The most efficient activating or conditioning reagent was found to be HCl at 0.02 M concentration, followed by KCl at 0.04 M and then NaCl at 0.04 M. The worst performing clinoptilolite was the original form under the conditions described in this study and it thus served as a control. The HCl-conditioned clinoptilolite was the most efficient in metal removal (79% Co 2+ and 73% Cu 2+) followed by the NaCl-conditioned form (69% Co 2+ and 54% Cu 2+ ), while the KCl-conditioned form adsorbed 54% and 73% of Co 2+ and Cu 2+, respectively. The column method was used for the cation-exchange processes with synthetic solutions of 0.0020 M, 0.0698 M and 0.2000 M of Co 2+ and Cu 2+ concentrations which were measured using atomic absorption spectroscopy (AAS).

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Influence of Zeolite Transformation in a Homoionic Form on the Removal of Some Heavy Metal Ions from Wastewater

Cited by 45 publications

References 13 publications

Investigations on some zeolitic volcanic tuffs from Cluj County (Romania), used for zinc ions removal from aqueous solution

Investigations on some zeolitic volcanic tuffs from Cluj County (Romania), used for zinc ions removal from aqueous solution

Evaluation of Absorption Process for Heavy Metals Removal found in Pharmaceutical Wastewater

The effect of conditioning with NaCl, KCl and HCl on the performance of natural clinoptilolite’s removal efficiency of Cu<sup>2+</sup> and Co<sup>2+</sup> from Co/Cu synthetic solutions

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