Synthesis of Silver-Impregnated Magnetite Mesoporous Silica Composites for Removing Iodide in Aqueous Solution

Jo, Sang-Eun; Choi, Jung-Weon; Choi, Sang-June

doi:10.3390/toxics9080175

Cited by 9 publications

(2 citation statements)

References 42 publications

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“…The iodine index (IV), or iodine adsorption, is the mass of iodine in grams that is consumed by 100 g of a chemical substance [ 106 ]: 0.1 g of carbonaceous material was added to 10 mL of 5% ( v / v ) HCl, boiled for 30 s, and then cooled at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Physical-Chemical Characterization of Different Carbon-Based Sorbents for Environmental Applications

et al. 2022

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Biochar has been used in various applications, e.g., as a soil conditioner and in remediation of contaminated water, wastewater, and gaseous emissions. In the latter application, biochar was shown to be a suitable alternative to activated carbon, providing high treatment efficiency. Since biochar is a by-product of waste pyrolysis, its use allows for compliance with circular economics. Thus, this research aims to obtain a detailed characterization of three carbonaceous materials: an activated carbon (CARBOSORB NC 1240®) and two biochars (RE-CHAR® and AMBIOTON®). In particular, the objective of this work is to compare the properties of three carbonaceous materials to evaluate whether the application of the two biochars is the same as that of activated carbon. The characterization included, among others, particle size distribution, elemental analysis, pH, scanning electron microscope, pore volume, specific surface area, and ionic exchange capacity. The results showed that CARBOSORB NC 1240® presented a higher specific surface (1126.64 m2/g) than AMBIOTON® (256.23 m2/g) and RE-CHAR® (280.25 m2/g). Both biochar and activated carbon belong to the category of mesoporous media, showing a pore size between 2 and 50 nm (20–500 Å). Moreover, the chemical composition analysis shows similar C, H, and N composition in the three carbonaceous materials while a higher O composition in RE-CHAR® (9.9%) than in CARBOSORB NC 1240 ® (2.67%) and AMBIOTON® (1.10%). Differences in physical and chemical properties are determined by the feedstock and pyrolysis or gasification temperature. The results obtained allowed to compare the selected materials among each other and with other carbonaceous adsorbents.

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Section: Methodsmentioning

confidence: 99%

Physical-Chemical Characterization of Different Carbon-Based Sorbents for Environmental Applications

et al. 2022

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“…Several studies have focused on how to remove stable and radioactive active iodine isotopes from water by using different sorbents and methods. A lot of these methods were not economical due to use various expensive nano adsorbents, for examples; (MXene/AgNW) composite material iodine from water 14 , (Mn 3 O 4 @polyaniline nanocomposite with multiple active sites) 15 , (AgNPs/CAM) 16 , (Ag@Cu-based Metal–organic framework) 17 , (AgNPs-Ag 2 O NPs modified Al 2 O 3 ) 18 , (AgNPs-impregnated zeolites) 19 , (Ag/Fe 3 O 4 composite nano-adsorbent) 20 , (Core–shell ZnO/Cu 2 O encapsulated Ag nanoparticles nano-composites) 21 , (Silver-Impregnated Magnetite Mesoporous Silica Composites) 22 and (Diatomite-nano TiO 2 composite) 23 .…”

Section: Introductionmentioning

confidence: 99%

Impact of (nano ZnO/multi-wall CNTs) prepared by arc discharge method on the removal efficiency of stable iodine 127I and radioactive iodine 131I from water

El-Khatib,

Bondouk,

Omar

et al. 2024

Sci Rep

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Radioactive iodine isotopes especially 131I are used for diagnosis and treatment of different types of cancer diseases. Due to the leak of radioactive iodine into the patient’s urine in turn, the wastewater would be contaminated, so it is worth preparing a novel adsorption green material to remove the radioactive iodine from wastewater efficiently. The removal of 127I and 131I contaminants from aqueous solution is a problem of interest. Therefore, this work presents a new study for removing the stable iodine 127I− and radioactive iodine 131I from aqueous solutions by using the novel nano adsorbent (Nano ZnO/MWCNTs) which is synthesized by the arc discharge method. It is an economic method for treating contaminated water from undesired dissolved iodine isotopes. The optimal conditions for maximum removal are (5 mg/100 ml) as optimum dose with shacking (200 rpm) for contact time of (60 min), at (25 °C) in an acidic medium of (pH = 5). After the adsorption process, the solution is filtrated and the residual iodide (127I−) is measured at a maximum UV wavelength absorbance of 225 nm. The maximum adsorption capacity is (15.25 mg/g); therefore the prepared nano adsorbent (Nano ZnO/MWCNTs) is suitable for treating polluted water from low iodide concentrations. The adsorption mechanism of 127I− on to the surface of (Nano ZnO/MWCNTs) is multilayer physical adsorption according to Freundlich isotherm model and obeys the Pseudo-first order kinetic model. According to Temkin isotherm model the adsorption is exothermic. The removal efficiency of Nano ZnO/MWCNTs for stable iodine (127I−) from aqueous solutions has reached 97.23%, 89.75%, and 64.78% in case of initial concentrations; 0.1843 ppm, 0.5014 ppm and 1.0331 ppm, respectively. For the prepared radio iodine (131I−) solution of radioactivity (20 µCi), the dose of nano adsorbent was (10 mg/100 ml) and the contact time was (60 min) at (pH = 5) with shacking (200 rpm) at (25 °C). The filtration process was done by using a syringe filter of a pore size (450 nm) after 2 days to equilibrate. The removal efficiency reached (34.16%) after the first cycle of treatment and the percentage of residual radio iodine was (65.86%). The removal efficiency reached (94.76%) after five cycles of treatment and the percentage of residual radio iodine was (5.24%). This last percentage was less than (42.15%) which produces due to the natural decay during 10 days.

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Innovation in radiolabeling methods: iodine adsorption characteristics on porous silica nanoparticles

Prihatiningsih,

Ariyanto,

Rachman Putra

et al. 2024

Adsorption

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Synthesis of Silver-Impregnated Magnetite Mesoporous Silica Composites for Removing Iodide in Aqueous Solution

Cited by 9 publications

References 42 publications

Physical-Chemical Characterization of Different Carbon-Based Sorbents for Environmental Applications

Physical-Chemical Characterization of Different Carbon-Based Sorbents for Environmental Applications

Impact of (nano ZnO/multi-wall CNTs) prepared by arc discharge method on the removal efficiency of stable iodine 127I and radioactive iodine 131I from water

Innovation in radiolabeling methods: iodine adsorption characteristics on porous silica nanoparticles

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