Kinetics and Equilibrium Studies for the Removal of Mn and Fe from Binary Metal Solution Systems Using a Romanian Thermally Activated Natural Zeolite

Abstract

In the present study, the sorption behavior of iron (Fe) and manganese (Mn) from a binary metal solution system onto thermally activated natural zeolite was studied. Batch adsorption experiments were carried out to investigate the effects of zeolite quantity, particle size, and activation temperature. Equilibrium studies were carried out to evaluate the adsorption capacity of the thermally activated natural zeolite. The obtained results showed that the thermally activated natural zeolite favored the removal of Fe over Mn, due to competition between them. Elemental analysis of the activated zeolite samples obtained by energy-dispersive X-ray analysis (EDX) indicated a Si/Al ratio >4, which is specific for clinoptilolite-type zeolite. The removal of Fe and Mn was best described by the Langmuir model, indicating the formation of a monolayer on the surface of the activated natural zeolite. The kinetic results revealed that the experimental data were best fitted by the pseudo-second-order model for both metals. The results suggest that a new natural zeolite from Rupea quarry, Brașov County, Romania could be used as a potential adsorbent for removal of Fe and Mn from binary metal solution systems, addressing the lack of information about this material from this region.

Effects of Siliceous Natural Nanomaterials Applied in Combination with Foliar Fertilizers on Physiology, Yield and Fruit Quality of the Apricot and Peach Trees

“…Information related to SNNMs from Romanian quarries, natural zeolites from Rupea quarries and diatomaceous earth from the Pătârlagele quarry, is relatively scarce. These siliceous natural nanomaterials were successfully used to remove Mn and Fe ions from a binary solution-natural zeolites from Rupea [51]-or for stored grain protection-DE from Pătârlagele [52,53]. Such applications are proof of superior sorption active surfaces and cation exchange capacity.…”

“…Natural zeolites of Rupea quarry are of clinoptilolite type-around 85% is clinoptilolite. The elemental composition of the thermally activated Rupea natural zeolite is: 61.2% O; 24.0% Si; 5.1% Al; 1.8% Ca; 2.2% K; 0.8% Fe; 0.7% Mg; 0.6% Na [51]. The DE from the Pătârlagele quarry was formed predominantly in Oligocene by marine diatoms.…”

“…The preparation process of the two selected SNNMs was the following: porous rock from the quarries was crushed (in Jaw Crusher BB 50, Retsch-Verder Scientific, Haan, Germany), washed with pure water at room temperature, dried at 105 • C for 24 h (in an ED 115 drying chamber, Binder, Tuttlingen, Germany) and milled in a planetary ball mill (PM 100, Retsch-Verder Scientific, Haan, Germany, with agate grinding jar and agate balls) to obtain particles sized 1-2 mm and activated. The activation of zeolites was performed by thermal treatment, at 200 • C for 2 h, as the first stage, followed by second activation treatment at 250 • C for 1 h [51]. The activation of DE was performed by mixing with 0.1 M HCl for 2 h at room temperature, in a ratio of 1 g DE to 10 mL HCl, followed by washing with 10 mL NaOH 0.1 M and 20 mL of pure water and drying at 105 • C for 24 h.…”

Removal of Malachite Green Dye Pollutant From Water Using Nano-Porous Structure of Modefied Natural Source

“…The Δ pH = (pHfinal− pHinitial) was plotted against the pHi as shown in Figure 3, and the point where pHf − pHi = 0 was taken as the pHpzc (Neag et al, 2020). The (pHZPC) for ZA was found at basic pH 7.18, it was proved that, the pHPZC of Na-X Zeolite was found to be 7.5 (Kiwan et al, 2021).…”

Новий Ефективний Вуглецевий Адсорбент Для Знезалізнення Води

“…Наприклад, високу ефективність щодо сполук заліза та мангану показали термічно активовані природні цеоліти. Сумісне видалення сполук Fe та Mn перебігає з утворенням моношару на поверхні активованого природного цеоліту, як довели автори роботи [8].…”