Thermal stability and heavy metal (As5+, Cu2+, Ni2+, Pb2+ and Zn2+) ions uptake of the natural zeolites from the Philippines

Olegario, Eleanor M.; Pelicano, Christian Mark; Felizco, Jenichi Clairvaux; Mendoza, Herman D.

doi:10.1088/2053-1591/ab1a73

Cited by 18 publications

(9 citation statements)

References 26 publications

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“…Notably, they are low cost and accessible in bulk. The adsorption capacities of natural zeolites for Pb 2+ , As 5+ , Cu 2+ , Zn 2+ and Ni 2+ are 125.2, 20.31, 14.65, 13.54 and 11.68 mg/g respectively [18] . An interesting class of materials for the environmental remediation is the modified zeolites, which enhances sorption capacity by introducing complex functional groups [19,20] .…”

Section: Introductionmentioning

confidence: 97%

Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism

Chen

Nong

Zhao

et al. 2020

Science of The Total Environment

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Section: Introductionmentioning

confidence: 97%

Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism

Chen

Nong

Zhao

et al. 2020

Science of The Total Environment

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“…Moreover, its similar chemical composition (aluminosilicate) to soil will not change the soil property. However, the sorption stability and/or cation exchange capability of zeolite would be influenced greatly by the soil composition and environment, including competing cations, organic matters and pH value [15,16]. In addition, the added minerals was not fully effective due to the fact that the complexation of heavy metal cations on inner surface of mineral blocks the cation diffusion and accessibility of the cationic sites during adsorption [17].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal conversion of model polluted soil into zeolite P to in-situ immobilize heavy metals via zeolitization and its microstructure behavior

Miao

Zhang²,

Liang³

et al. 2022

Mater. Res. Express

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To develop a new technology to remediate pollution sites stably and effectively, hydrothermal conversion of polluted soil (model soil) into zeolite P for in-situ immobilization of Heavy Metals (HM) was carried out. Zeolite P could be synthesized from soil hydrothermally with a large range of Al/Si ratio (0.33-1.0) in 48 hours at 200 °C. With immobilizing heavy metals (Cr, Zn and Cd), the crystallization of Zeolite P (Cr-ZP, Zn-ZP and Cd-ZP) was delayed with the order of Cr >Zn >Cd because the stronger the ligand effect of heavy metals have, the more heavily the nucleation and growth were influenced. During immobilization via zeolitization, a self-adaptive structuring behavior was confirmed by EDAX, BET and Rietveld refinement analyses: zeolite P structured more [AlO4]- to immobilize HM because the flexible 8-member-Ring channels (8 mRs) with higher Al/Si ratio could complex with more HM readily. The encapsulated HM occupied the original Na positions (Na1 and Na2) of zeolite P competitively because of their different cation size, e.g., the smallest Cr3+ could substitute all Na1 because Na1 is closer to the Framework Oxygen (FO); the largest Cd2+, however, substituted Na1 (9 %) and Na2 (14 %) evenly. The shrunken 8 mRs due to heavy metal immobilization also caused different chemical environments for different heavy metals immobilized because the smaller heavy metal cation could get closer to the framework, and also coordinated with more FO.

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“…They are characterized by primary porosity and secondary porosity. Ion exchange properties were used, among others, for removing different cations of heavy metals [ 26 ]. Secondary pores are responsible for the absorption of relatively large particles and have a significant role in many processes and the sorption of organic compounds, e.g., phenol [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

The Efficiency of the Removal of Naphthalene from Aqueous Solutions by Different Adsorbents

Puszkarewicz

Kaleta

2020

IJERPH

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The paper presents the results of laboratory tests on possibilities to utilize active carbons produced in Poland (AG-5 and DTO) and clinoptilolite for removing naphthalene from a water solution in the adsorption process. The concentration of naphthalene in the model solution was 20 mg/dm3. The effects of pH, dose and adsorption time were determined under static conditions. Adsorption kinetics were consistent with the pseudo-second-order model (PSO). Among the applied models, the best fit was obtained using the Langmuir isotherms. The maximum adsorption capacity for the activated carbons (AG-5 and DTO) equaled 24.57 and 30.28 mg/g, respectively. For clinoptilolite, all the analyzed models of adsorption poorly described the adsorption process. The flow conditions were realized by filtration method. On the basis of the obtained results, the breakthrough curves, so-called isoplanes, were prepared and served in turn to determine the adsorption capacities in flow conditions. The total adsorption capacities determined under dynamic conditions of the AG-5 and DTO activated carbons were 85.63 and 94.54 mg/g, respectively, and only 2.72 mg/g for clinoptilolite. The exit curves (isoplanes) were also utilized to determine the mass penetration zone (the adsorption front height), as well as to calculate the rate of mass-exchange zone advance.

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Thermal stability and heavy metal (As⁵⁺, Cu²⁺, Ni²⁺, Pb²⁺ and Zn²⁺) ions uptake of the natural zeolites from the Philippines

Cited by 18 publications

References 26 publications

Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism

Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism

Hydrothermal conversion of model polluted soil into zeolite P to in-situ immobilize heavy metals via zeolitization and its microstructure behavior

The Efficiency of the Removal of Naphthalene from Aqueous Solutions by Different Adsorbents

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