Sorption processes and XRD analysis of a natural zeolite …
In this study the Pb 2+, Cd 2+ and Zn 2+ adsorption capacity of a natural zeolite was evaluated in batch tests at a constant pH of 5.5 by polluting this mineral with solutions containing increasing concentrations of the three cations to obtain adsorption isotherms. In addition X-ray powder diffraction (XRD) was used to investigate the changes of zeolite …
Factors affecting adsorption characteristics of Zn2+ on two …
The results show that the Zn2+ adsorption behavior of both zeolites is highly dependent on the pH. Adsorption dependence on lower pH values (pH<4) is explained by the …
Removal of Ca2+and Zn2+from aqueous solutions by zeolites …
Removal of Ca2+and Zn2+from aqueous solutions by zeolites NaP and KP. Muhammad Adil. 2010, Environmental Technology. See full PDF download Download PDF.
Removal of Heavy Metal Ions Using Pristine and Functionalized Natural
Heavy metal ions have attracted significant concern regarding their toxicity in living organisms. Concurrently, the removal of heavy metals by the adsorption method is also under the spotlight because it is effective, less cost-demanding, and easy to operate. To date, natural zeolites become one of the most used adsorbents for it is low cost, abundant in reserve, and has high …
(PDF) Use of natural zeolites from Maramures county …
The use of natural zeolites in wastewaters cleaning is a highly appreciated method especiallydue to the natural zeolites high ion exchange capacity correlated to their relative low-cost exploitation.
An assessment of the effectiveness of natural zeolites for …
An assessment of the effectiveness of natural zeolites for removal of ammonium and zinc from their dilute solutions. ... Clay Sci., 3: 281-290. The adsorption of NH~ and Zn2+ by four Korean zeolite samples which contained clinoptil- olite, mordenite or both was measured by adding solutions containing NH+, Zn2 +, or both, each at a concentration ...
Removal of heavy metals from waters by means of natural zeolites
Definition of the regeneration parameters. Plate 1. Pilot plant set up at Rennes' station (France). Removal of heavy metals from waters by means of natural zeolites 1505 I ::L 150 100 50 Zn2+ Cd2"1" 4 ' I i I I I I i I t 0 0 200 300 400 500 600 BV Fig. 6. Exhaustion obtained when the supply contains several cations. Table 2.
Heavy metal ions removal from waste water bythe natural zeolites
It is clear from these results that the Mordenite is a potential candidate for removal of Co2+, Zn2+ and Mn2+ ions from wastewater than the Stilbite and Heulandite. The extraction efficiency value for Co2+is observed highest forMordenite at a concentration of 50 mg/l. ... Present results suggest that natural zeolites can be removed heavy metal ...
Full article: The use of natural zeolite to remove heavy metals …
Abstract. In this study, the adsorption behavior of Cu 2+, Pb 2+ and Cd 2+ from synthetic metal solutions using natural zeolites was studied in order to investigate the efficiency of adsorbents of heavy metals from industrial wastewater. The kinetic study indicated the suitability of the zeolite for the removal of Cu 2+, Pb 2+ and Cd 2+ ions from synthetic …
The removal of heavy metal cations by natural zeolites
According to the Q (mmol/kg) parameter, sorption on zeolite is produced following the sequence Co2+ > Cu2+ > Zn2+ > Mn2+ . Zeolites, in general, are weakly acidic in nature and sodium-form exchangers are selective for hydrogen (R–Na+ H2 O ⇔ RH + Na+ + OH− ), which leads to high pH values when the exchanger is equilibrated with relatively ...
Adsorption of CO2, N2, and O2 on Natural Zeolites
Pressure swing adsorption (PSA) and temperature swing adsorption are potential techniques for removing CO 2 from high-pressure fuel gas streams. Natural zeolites are …
Sorption of Pb2+, Zn2+, Cu2+ and Ni2+ Ions on Na …
Zeolites are naturally occurring or synthesized alumino-silicate minerals characterized by uniform microporosity and high crystallinity [6]. Zeolites owe specific properties to their three-dimensional TO 4 tetrahedral framework structure (T is Al or Si in a natural zeolite), connected with each other by sharing corner oxygen atoms [7].
Factors affecting adsorption characteristics of Zn2+ on two …
Because zeolite has high adsorption capacity for pollutants, Jacobs and Förstner [17] proposed the possible use of natural and modified zeolites for capping contaminated …
Application of a Novel Surfactant-Modified Natural Nano …
The adsorption mechanism of Cd, Fe, and Ni, ions on natural (clinoptilolite) zeolites, a regional low-cost natural available adsorbent was studied in a batch adsorption system. The effect of several parameters such as contact time, zeolite dose, particle size, the effect of pH, and initial concentration of metal ions in the adsorption process ...
Factors affecting adsorption characteristics of Zn2+ on two natural …
This paper investigates Zn2+ adsorption characteristics of two natural zeolites found in the regions of Gordes and Bigadic, in western Turkey. The results show that the Zn2+ adsorption behaviour of both zeolites is highly dependent on the pH. Adsorption dependence on …
Enhanced heavy metal adsorption capacity of surface …
Natural zeolites have received much attention due to their excellent adsorption behavior and capability to remove cations and trace quantities of heavy metal ions from aqueous solutions via ion exchange process [13].They are a family of crystalline aluminosilicates with a framework structure built from tetrahedral building blocks, each of which contains four oxygen …
Thermal stability and heavy metal (As5+, Cu2+, …
Herein, we present the ability of natural zeolites from the Philippines to adsorb heavy metal (As5+, Cu2+, Ni2+, Pb2+ and Zn2+) ions for the first time.
Application of natural zeolite in wastewater treatment: A …
Natural zeolites are good potential material for water and wastewater treatment. It is due to the advantages of low cost, ion-exchange and adsorption capability of the natural zeolites. ... Oren, A.H., Kaya, A. (2006) Factors affecting adsorption characteristics of Zn2+ on two natural zeolites. Journal of Hazardous Materials, B131, 59-65. [81]
(PDF) Catalytic Activities of Fe3+- and Zn2+-Natural
The crystallinity and the morphology of the modified zeolites showed that the natural zeolite from Malang Indonesia has the main component of mordenite-type zeolite.
Cation exchange (Ag+, Zn2+, Cu2+) behavior of natural zeolites
dc.contributor.advisor: Ülkü, Semra: en: dc.contributor.author: Top, Ayben: dc.date.accessioned: T09:07:53Z: dc.date.available: T09:07:53Z: dc ...
Natural zeolites as effective adsorbents in water and …
In this paper, we review the recent development of natural zeolites as adsorbents in water and wastewater treatment. The properties and modification of natural zeolite are …
Ion Exchange of Zeolite Na-Pc with Pb2+, Zn2+, and Ni2
The observed increased selectivity for Pb vs. Na is comm o n and is reported in m a n y synthetic and natural zeolites including zeolites X and Y, zeolite A, clinoptilolite, and mordenite (Wiers et al., 1982; Blanchard et al., 1984). The reverse exchange reaction is considerably slower and displays a limited but noticeable hysteresis (Figure 4).
Experimental and computational study on the Ca2+, Mg2+, Zn2…
In nature, these are most often sodium and potassium cations, but they can be e.g. Ca 2+, Mg 2+ and Zn 2+ [5, 6]. Thanks to these properties, zeolites have found application in many branches of chemistry. They are used, among others, in the petrochemical industry as catalysts for various processes or as adsorbents of water pollution [7, 8 ...
Experimental and computational study on the Ca2+, Mg2+, Zn2…
Thanks to this, the structure of the zeolite contains exchangeable cations [3,4]. In nature, these are most often sodium and potassium cations, but they can be e.g. Ca 2+, Mg 2+ and Zn 2+ [5,6]. Thanks to these properties, zeolites have …
Sorption processes and XRD analysis of a natural zeolite …
In this study a natural zeolite coming from a layer in the north of Sardinia has been artificially polluted with single aqueous solutions containing increasing concentrations of …
Assessment of the natural zeolite adsorption capacity for …
These results show the effectiveness of natural zeolites in the removal of TCS, using small mass of adsorbent which can be reused, being, therefore, an environmentally suitable alternative in water treatment.Keywords Natural zeolite Adsorption Triclosan Kinetic study Isotherm study References [1] Y.C. Lu, J.H. Mao, W. Zhang, C. Wang, M. Cao, X ...
(PDF) Metal Ion Exchange by Natural Zeolites
The influence of pretreatment on the capacity and selectivity of natural zeolite for Zn2+ and Mn2+ ions has been studied. Natural tuff (sample 1), consisting mainly of zeolite clinoptilolite, was ...
Ion exchange of zeolite Na-P(c) with Pb2+, Zn2+, and Ni2
This paper examines the ion-exchange properties of synthetic zeolite Na-P0, which was pro- duced from perlite-waste fines and has a SiO2:A1203 ratio of 4.45:1 and a cation-exchange capacity (CEC ...
Adsorption uptake of Philippine natural zeolite for Zn2+ ions …
XRD showed significant peaks indexed to natural mordenite-type zeolite along with other natural zeolites and minerals. SEM micrographs revealed a rough and corrugated …
The effect of concentration and pH on selectivity of ion …
Natural zeolites have a great potential as low-cost, non-toxic and highly selective sorbents in pollution control, especially in waste-water management. The potential of Croatian and Serbian clinoptilolite-rich (HEU-type zeolite) tuffs from four different deposits have been evaluated for their use in metal removal from aqueous solutions by the ...