Adsorption of Sulfur Dioxide on Clinoptilolite/Nano Iron Oxide and Natural Clinoptilolite

Abstract

Background: Sulfur dioxide gas is known to include pollutants that are harmful to human health and the environment. Therefore, due to the increase of industrial activities, SO2 gas pollution control is very important. Objectives: The purpose of this study was to investigate the efficiency of sulfur dioxide removal by iron oxide nanoparticles deposited on clinoptilolite zeolite. Methods: Two materials, natural clinoptilolite and clinoptilolite containing iron oxide nanoparticles, were used as adsorbents of SO2. Both materials were characterized via scanning electron microscopy imaging, infrared spectroscopy, and N2 porosimetry, along with the determination of the thermodynamic properties and kinetics of SO2 adsorption. Therefore, breakthrough experiments were carried out at different temperatures and with different contact times. Sulfur dioxide adsorption of a real sample was considered for both adsorbents. Results: The adsorption efficiency of SO2 in the synthetic and actual sample was obtained at 80.3% and 66.7%, respectively, under optimum conditions (temperature of 25°C and duration of 28.5 minutes) by modified zeolite with iron oxide nanoparticles. The removal percentage average of SO2 was also obtained in the synthetic and actual sample at 43.8% and 31.3%, respectively, by zeolite in optimum conditions (temperature of 25°C and contact time of 20.5 minutes). The adsorption of SO2 with both adsorbents followed the pseudo-second-order equation and the adsorption process was an exothermic and spontaneous process. Conclusions: The addition of these iron oxide nanoparticles had a positive impact on the surface area and on SO2 capacity.

The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

“…The negative values of ΔG 0 at all temperatures displayed the feasibility and spontaneity of the adsorption process. Furthermore, the enhanced disorder and randomness at the solidsolution interface of Cr(VI) with the adsorbent were confirmed by the positive values of ΔS 0 [31,[45][46][47][48]. The thermodynamic and spontaneous adsorption processes between MTBs and Cr(VI) were similar to previous studies that investigated the adsorption behavior between surfactant-modified bentonite and Cr(VI) [23,24,26] (Table 1).…”

The Ecogeographical Impact of Air Pollution in the Azerbaijan Cities: Possible Plant/Synthetic‐Based Nanomaterial Solutions

“…Also, it was shown that by reducing the temperature and increasing the pressure, CO2 adsorption escalated [84]. Natural clinoptilolite and clinoptilolite containing iron oxide NPs, have been also developed for SO2 adsorption [85]. This NP was able to adsorb SO2 in synthetic and actual samples with an efficiency of 80% and 66%, respectively [85].…”

“…Natural clinoptilolite and clinoptilolite containing iron oxide NPs, have been also developed for SO2 adsorption [85]. This NP was able to adsorb SO2 in synthetic and actual samples with an efficiency of 80% and 66%, respectively [85]. Also, the SO2 removal percentage was calculated at 43.8 for the synthetic sample and 31.3 for the actual specimen at room temperature [85].…”

Structural and ammonia adsorption properties of the Gördes clinoptilolite after HCl acid treatment

“…Besides these well-known sites, there are studies showing that clinoptilolite can have other cation positions containing Cs + , Ag + , Pb 2+ , Cd 2+ , Hg 2+ ions [15][16][17][18]. Clinoptilolite can be used for gas separation and removal of toxic gases due to its structural advantages [19][20][21][22][23][24].…”