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Comparative Study of Mercury(II) Removal from Aqueous Solutions onto Natural and Iron- Modified Clinoptilolite Rich Zeolite (CROSBI ID 286133)

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Ugrina, Marin ; Čeru, Teja ; Nuić, Ivona ; Trgo, Marina Comparative Study of Mercury(II) Removal from Aqueous Solutions onto Natural and Iron- Modified Clinoptilolite Rich Zeolite // Processes, 8 (2020), 11; 1523, 21. doi: 10.3390/pr8111523

Podaci o odgovornosti

Ugrina, Marin ; Čeru, Teja ; Nuić, Ivona ; Trgo, Marina

engleski

Comparative Study of Mercury(II) Removal from Aqueous Solutions onto Natural and Iron- Modified Clinoptilolite Rich Zeolite

The contamination of soil and water bodies with mercury from anthropogenic sources such as mining and industry activities causes negative effect for living organisms due to the process of bioaccumulation and biomagnification through the food chain. Therefore, the need for remediation of contaminated areas is extremely necessary and very desirable when it is cost- effective by using low-cost sorbents. This paper compares the sorption abilities of natural and iron-modified zeolite towards Hg(II) ions from aqueous solutions. The influence of pH, solid/liquid ratio (S/L), contact time, and initial concentration on the sorption efficiency onto both zeolites was investigated. At the optimal pH = 2 and S/L = 10, the maximum amount of sorbed Hg(II) is 0.28 mmol/g on the natural zeolite and 0.54 mmol/g on the iron-modified zeolite. It was found that rate-controlling step in mass transfer is intraparticle diffusion accompanied by film diffusion. Ion exchange as a main mechanism, accompanied with surface complexation and co- precipitation were included in the Hg(II) sorption onto both zeolite samples. This is confirmed by the determination of the amount of sorbed Hg(II) and the amount of released exchangeable cations from the zeolite structure as well as by the scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS) of saturated zeolite samples. In a wide pH range, 4.01 ≤ pH ≤ 11.08, the leaching of Hg(II) was observed in the amount of only 0.28– 0.78% from natural zeolite and 0.07–0.51% from iron-modified zeolite indicating that both zeolites could be used for remediation purposes while the results suggest that modification significantly improves the sorption properties of zeolite.

natural zeolite ; iron-modified zeolite ; mercury(II) ; sorption ; leaching

This work has been fully financially supported by the bilateral Croatian-Slovenian project “Natural modified sorbents as materials for remediation of mercury contaminated environment” (2020–2023) and the research program “Groundwater and Geochemistry (P1- 0020)”.

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Podaci o izdanju

8 (11)

2020.

1523

21

objavljeno

2227-9717

10.3390/pr8111523

Povezanost rada

Kemijsko inženjerstvo

Poveznice
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