4/17/2006· 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 behavior of both zeolites is highly dependent on the pH. Adsorption dependence on lower pH values (pH<4) is explained by the dissolution of crystal structure and ...
Understanding methane activation pathways on Zn-modified high-silica zeolites (ZSM-5, BEA) is of particular importance because of the possibility of methane involvement in coaromatization with higher alkanes on this type of zeolites. Herein, two samples of Zn-modified zeolite BEA containing exclusively either small zinc oxide clusters or isolated Zn2+ cations have been synthesized and ...
(2008). Comparative Study of Zn2+, Cd2+, and Pb2+ Removal From Water Solution Using Natural Clinoptilolitic Zeolite and Commercial Granulated Activated Carbon. Equilibrium of Adsorption. Separation Science and Technology: Vol. 43, No. 8, pp. 2117-2143.
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 behavior of both zeolites is highly dependent on the pH. Adsorption dependence on lower pH values (pH<4) is explained by the dissolution of crystal structure and ...
Tab. 1Cation exchange capacities of natural zeolites CEC [meq/gl Clinoptilolite 1.17 Chabazite 3.00 Phillipsite 2.55 Mordenite 1.01 The selectivity of exchange, however, varies notably between different heavy metal cations. Lead, for example, is exchanged much more selectively on all four zeolites tested then cadmium, zinc or copper.
Cation exchange (Ag+, Zn2+, Cu2+) behavior of natural zeolites . By Ayben Top. Get PDF (2 ) Abstract. Thesis (Master)--Izmir Institute of Technology, Chemical Engineering, Izmir, 2001Includes bibliographical references (leaves: 75-81)Text in English; Abstract: Turkish and Englishxv, 103 leavesIn this study, clinoptilolite, most abundant ...
Cation exchange (Ag+, Zn2+, Cu2+) behavior of natural zeolites. View/ Open. MasterThesis (2.269Mb) Date 2001. Author. Top, Ayben. Metadata Show full item record. Abstract. In this study, clinoptilolite, most abundant zeolite present in nature, was proposed as a low cost antibacterial material. As a preliminary work, antibacterial activities of ...
Natural zeolites in water quality system. The project will focus on testing natural serbian and croatian zeolites for their use in the removal of toxic zinc, chromium, copper and arsenic from waste and drinking water. ... Zn2+ and Pb2+ are common metal ions, which accumulate in living organisms causing numerous disorders and diseases. They are ...
The adsorption capacities of selected natural and synthetic sorbents are presented in table 7. Given the relatively high maximum adsorption capacity of synthetic mordenite-type zeolites, the material can be a good alternative material for the removal of heavy metals, especially for Zn 2+, in contaminated waters. Additionally, the reduced ...
Removal of Zn 2+, Cd 2+ and Pb 2+ from binary aqueous solution by natural zeolite and granulated activated carbon 133 Maced., J. Chem. Chem. Eng., 26 (2), 125–134 (2007) Adsorption in multi-com ...
Ningshu Natural zeolites can be used as ion exchangers for removal of radioactive cations such as Cs+ and Sr2+ and heavy metal cations such as Cu2+, Cd2+, Zn2+, Ni2+ and Pb2+. Radioactive Cs+ and Sr2+ may be present in recycling waters of atomic power stations or as environmental contaminants after accidents at atomic power stations.
A Brazilian fly ash sample (CM1) was used to synthesize zeolites by hydrothermal treatment. Products and raw materials were characterized in terms of real density (Helium Pycnometry), specific surface area (BET method), morphological analysis (SEM), chemical composition (XRF) and mineralogical composition (XRD). The zeolites (ZM1) from fly ash were used for metal ion removal from water.
Continuous elimination of Pb2+, Cu2+, Zn2+, H+ and NH4+ from acidic waters by ionic exchange on natural zeolites By Benjamin Calvo, Laureano Canoira, Fernando Morante, José M. Martinez-Bedia, Carlos Vinagre, Jeronimo-Emilio Garcia-Gonzalez, Jan Elsen and Ramon Alcantara
Natural zeolites: occurrence, properties, applications (Reviews in mineralogy and geochemistry 45) | David L. Bish, Doug Ming | download | B–OK. Download books for free. Find books
The natural zeolite sample (SAILE Industries Inc., Philippines) was ground to have a particle size ranging from 35–180 μm size fractions and dried at 110 °C for 5 h.The metal ions inspected were As 5+, Cu 2+, Ni 2+, Pb 2+ and Zn 2+.The oxide and salts of each ion (As 2 O 3, ZnSO 4 7H 2 O, CuSO 4 5H 2 O, NiSO 4 6H 2 O, and Pb(NO 3) 2) were dissolved in 100 ml deionized H 2 O to generate ...
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.
A.E. Turkman, S. Aslan, I. Ege, Treatment of metal containing wastewaters by natural zeolites, Fresenius Environmental Bulletin 13 (2004) 574–580. [86] A.H. Oren, A. Kaya, Factors affecting adsorption characteristics of Zn2+ on two natural zeolites, Journal …
5/5/2005· In this study, we investigated the removal of Fe, Pb, Cd, and Zn from synthetic mine waters by a natural zeolite. The emphasis was given to the zeolite's behavior toward a few cations in competition with each other. Pb was removed efficiently from neutral as well as from acidic solutions, whereas the uptake of Zn and Cd decreased with low pH and high iron concentrations.
Natural zeolites can accommodate a wide variety of cations, for example the heavy metals Al, Pb2+, Hg2+, Ni2+, Cu2+, Ba, Fe3+, Zn2+, Cr3+ and others such as Na, K, Ca2+, Mg2+ and many other molecules which carry a positive charge. These positive ions are rather loosely held and can readily be exchanged for others in a contact solution.
The unique treedimensional porous structure gives natural zeolites various application possibilities. Because of the excess of the negative charge on the surface of zeolite, which results from isomorphic replacement of silicon by aluminum in the primary structural units, natural zeolites belong to the group of cationic exchangers. Natural zeolites have advantages over other cation exchange ...
carbon had higher adsorption capacity for Zn2+ and Cd than natural zeolite. The order of metal ion selectivity on both adsorbents is Pb 2+> Cd > Zn2+.. The binary equilibrium of adsorption showed competitive nature. For all studied metal ions (Zn2+, Cd2+ and
6/10/2014· The adsorption of Pb2+, Cd2+, and Zn2+ from equimolar multicomponent solutions onto natural and Fe(III)-modified zeolites was studied by batch experiments in order to determine the influence of the competitive effect on the efficiency ions removal at different initial concentrations and different temperatures. Kinetic and equilibrium studies showed that affinity of both zeolites was the ...
7/30/2009· Continuous elimination of Pb2+, Cu2+, Zn2+, H+ and NH4 + from acidic waters by ionic exchange on natural zeolites. Calvo B(1), Canoira L, Morante F, Martínez-Bedia JM, Vinagre C, García-González JE, Elsen J, Alcantara R. Author information: (1)ETS Ingenieros de Minas, Universidad Politécnica de Madrid, Rios Rosas 21, 28003 Madrid, Spain.
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 structure caused by the exchange with ...
This paper investigates Zn 2+ adsorption characteristics of two natural zeolites found in the regions of Gordes and Bigadic, in western Turkey. The results show that the Zn 2+ adsorption behavior of both zeolites is highly dependent on the pH.