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The adsorption uptake of synthetic mordenite-type zeolites with varying Si/Al ratio was investigated for Zn2+ ions in aqueous solution to determine the influence of Si/Al ratio in removing heavy ...
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This paper examines the ion-exchange properties of synthetic zeolite Na-Pc, which was produced from perlite-waste fines and has a SiO2:Al2O3 ratio of 4.45:1 and a cation-exchange capacity (CEC) of 3.95 meq g−1. Although equilibrium is attained rapidly for all three metals, exchange is incomplete, with Ac(max) (maximum equilibrium fraction …
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Request PDF | Retention of Cu2+ and Zn2+ on natural zeolites: Assessment of kinetic parameters by numerical simulation | This paper reports the influence of pH on the kinetics of ion exchange of ...
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The Philippine natural zeolite (PNZ) was characterized and subjected to Zn²⁺ adsorption tests in aqueous solutions to determine its adsorption uptake and to …
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Continuous elimination of Pb2+, Cu2+, Zn2+, H+ and NH4+ from acidic waters by ionic exchange on natural zeolites (PDF) Continuous elimination of Pb2+, Cu2+, Zn2+, H+ …
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The obtained results clearly showed that Mordenite can be used to reduce Co2+ content from wastewater. These zeolites were less favourable to remove Mn2+ions. Finally, it is concluded that Mordenite can be used as a low-cost adsorbent for the removal of Co2+, Zn2+ and Mn2+ ions from aqueous solution. Table 1. XRF analysis of natural …
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In relation to the reported methane activation on Zn-modified zeolite ZSM-5 at room temperature to afford the surface methoxy species by Xu et al. (Chem. Sci. 2012, 3, 2932), the activation of methane on Zn2+-exchanged H-ZSM-5 zeolite in the absence and the presence of molecular oxygen has been studied with 13C magic angle spinning …
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Natural zeolites also gained a significant interest mainly due to their valuable properties such as ion-exchange capability. Large deposits of natural zeolites in many countries provide local industries some promising benefits such as cost efficiency since they are able to treat wastewater contaminated with phenolic compounds at low cost [13].
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The raw Philippine natural zeolites (RawZeo0) were preconditioned with 1.5M NaOH (Merck, 99%) solution. For every 250 mL of the base solution, 25g of PNZ was added
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Natural zeolites are hydrated aluminosilicate minerals of a porous structure with valuable physicochemical properties, such as cation exchange, molecular sieving, …
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The adsorption of Zn(2+) onto NaA and NaX zeolites was investigated. The samples were synthesized according to a hydrothermal crystallization using aluminium isopropoxide (Al[OCH(CH(3))(2)](3)) as a new alumina source. The effects of pH, initial concentration, solid/liquid ratio and temperature were …
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Request PDF | Continuous elimination of Pb2+, Cu2+, Zn2+, H+ and NH4+ from acidic waters by ionic exchange on natural zeolites | A study of breakthrough curves for cations usually found in acid ...
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The adsorption uptake of synthetic mordenite-type zeolites with varying Si/Al ratio was investigated for Zn2+ ions in aqueous solution to determine the influence of Si/Al ratio in removing heavy ...
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Natural and modified zeolites are efficient at low concentrations of different metal ions like Zn2+ (concentration from 1 to 5 mg/L) and Fe3+ (concentrations from 0.2 to 2.0 mg/L) about 50-60%. In many studies revealed the values of the maximum capacity adsorption, Qmax for metal ions removal from synthetic and real water.
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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 …
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The natural zeolite used in this study was more selective for Zn 2+ cation. Besides the interaction between this metal, which has a smaller ionic radius, and the …
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Zn2+ adsorption results: Clinoptilolite 6.3 mg of Zn2+/g, Haulandite-Clinoptilolite 22.26 mg of Zn2+/g, Haulandite 5.5 mg of Zn2+/g, Morante and sample X 45.1 mg of Zn2+/g. When applying X-ray diffraction (XRD), significant differences were observed in the chemical and structural structure of natural zeolites and sample X [ 6 ].
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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 …
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Abstract Low-cost zeolite sorbents, which have unique ion exchange and sorption properties, have been investigated as candidates for cost-effective removal of heavy metals from waste solution. Waste products from various industries are employed to prepare or modify zeolite for the improvement of adsorption capacity. In this review, the …
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In this study, zeolites were synthesized from low-calcium (LCZ) and high-calcium (HCZ) fly ash, respectively. Subsequently, the zeolites were tested for their removal effectiveness for four aqueous cations, namely, Zn2+, Cu2+, Cd2+, and Pb2+, as a function of contact time, pH value, adsorbent dosage, and initial concentration of heavy …
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Herein, we present the ability of natural zeolites from the Philippines to adsorb heavy metal (As 5+, Cu 2+, Ni 2+, Pb 2+ and Zn 2+) ions for the first time. The primary component of the zeolite sample is clinoptilolite based on XRD and EDX results. Surface morphological analysis revealed that the zeolite has a rough surface with …
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Cation Exchange (Ag+, Zn2+, Cu2+)behavior of Natural Zeolites. 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 the original, Ag, and Zn forms of the clinoptilolite were investigated against several strains and compared ...
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NH4+ and Zn2+ are the most abundant cations detected in contaminated groundwater near municipal landfill sites. Remediation strategies were developed accordingly, such as permeable reactive barrier (PRB) that was reported as effective for single contaminant removal with porous reactive materials, including zeolite and …
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Factors affecting adsorption characteristics of Zn2+ on two natural zeolites
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This study investigates the ability of natural clinoptilolite zeolite as a low-cost adsorbent for removing heavy metal ions, specifically lead, cadmium, and cobalt, from the aquifer in the Varamin region in a discontinuous absorption system. Characterization techniques such as XRD, XRF, ICP-MS, BET, and FESEM were used to analyze the …
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Georgios E. Christidis and. Ioannis Paspaliaris. Article. Metrics. Get access. Cite. Rights & Permissions. Abstract. This paper examines the ion-exchange properties …
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The natural zeolites have porous and plate-like structures, which suggest the presence of clinoptiloliteheulandite family of zeolites. After annealing of Cu-exchanged zeolite at 550 °C, CuO ...
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DOI: 10.1016/j.jhazmat.2009.08.132 Corpus ID: 6496746; Adsorption of Zn2+ ions onto NaA and NaX zeolites: kinetic, equilibrium and thermodynamic studies. @article{Nibou2010AdsorptionOZ, title={Adsorption of Zn2+ ions onto NaA and NaX zeolites: kinetic, equilibrium and thermodynamic studies.}, author={Djamel Nibou and …
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The effects of chemical treatment on the radiation-shielding properties of Philippine natural zeolites were investigated using EpiXS following the EPICS2017 library. The zeolites were studied using X-ray diffraction and energy-dispersive X-ray spectroscopy. The acid treatment eliminated Fe and Ca, having a negative impact on the cross-section ...
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DOI: 10.1016/J.JHAZMAT.2005.09.027 Corpus ID: 24960583; Factors affecting adsorption characteristics of Zn2+ on two natural zeolites. @article{Oren2006FactorsAA, title={Factors affecting adsorption characteristics of Zn2+ on two natural zeolites.}, author={Ali Hakan Oren and A. M. Kaya}, journal={Journal of …
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