Abstract:Reclaimable adsorbents have an essential role in removing radionuclides from waste streams. Herein, zinc ferrite-humic acid ZFO/HA nanocomposite was synthesized for effective cesium and barium adsorption. The prepared ZFO/HA nanocomposite was analyzed using analytical techniques including XRD, FTIR, EDX, and SEM. From kinetic studies, the mechanism adsorption process follows the second model. The isotherm studies clarified that the Langmuir model fit the adsorption of both ions onto the prepared sample, and th… Show more
“…Also, at around 3428 cm −1 , O–H stretching appears. Aromatic C=C stretching was determined to be responsible for the 1635 cm −1 absorption band [ 23 ], indicating that the cubic spinel phase was effectively manufactured for the CZ-FN nanostructures. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The growth capacity of the adsorption process with increasing amounts of CZ-FN is predictable because as the quantity of CZ-FN rises, the active site numbers on the surface of CZ-FN increase [ 24 ]. There is an inconsistency between the removal efficiency of each ion and the amount of sorbent, and this clarifies that the functional group on the surface of CZ-FN has a marked preference for Sr (II) over Cs (I); this can be referring to increasing the hydration radius of Cs (I) comparing with Sr (II) [ 23 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…This second model has been utilized to represent the adsorption kinetic for the system of cesium and strontium onto CZ-FN. This model has postulated a chemical rate Associated with the elimination process of the ions and chemisorption [ 23 ]. The second model has been expressed in the non-linearized formula as shown in Eq.…”
Section: Resultsmentioning
confidence: 99%
“…The NiFe 2 O 4 @PNC was used for the adsorption of radioactive Cs (I) and Sr (II), and the adsorption capacity was found to be 232.12 mg/g and 212.5 mg/g, respectively [ 22 ]. Abdel Maksoud et al [ 23 ] synthesized a zinc ferrite-humic acid nanocomposite. The optimum conditions for adsorption of Ba (II) and Cs (I) onto zinc ferrite-humic acid composite were achieved as pH 5, and the adsorption capacities of the magnetic nanocomposite were 62.33 mg/g for Ba (II) and 42.55 mg/g for Cs (I).…”
Carbon-coated ZrO2/Mn-Mg-Zn ferrites nanostructures (CZ-FN) have been prepared as a new inorganic sorbent to remove Cs (I) and Sr (II) from a waste stream. Adsorption of Cs (I) and Sr (II) has been implemented considering different noteworthy parameters, for example, shaking time and the optimum time achieved high adsorption capacity of both ions [103 and 41 mg/g for Sr (II) and Cs (I)] was found 30 min. Also, the impact of pH values was studied; the best pH value for the adsorption process is pH 6. The adsorption saturation capacity of CZ-FN is 420.22 and 250.45 mg/g for strontium and cesium, respectively. The solubility percentage of CZ-FN was calculated utilizing diverse molarities from HNO3, HCl, and NaOH as eluents, the obtained data reveals an increase in the solubility percentage with more increase in the molarity of the eluents. The elevation in the solubility percentage follows the following order; HNO3 < HCl < NaOH. The kinetic studies were applied using the nanolinear form of different kinetic models; it was found that the adsorption process obeys the nonlinear pseudo-second-order. According to equilibrium studies, the Langmuir model has been more accurate than the Freundlich model for adsorption in the case of binary systems. The values of Di for the strontium and cesium are 10−10 m2/s, which displays the chemisorption nature of this process. The greatest values of the desorption process for the strontium and cesium are 96.87% and 94.43 by 0.3 M of HNO3. This indicated that the carbon-coated ZrO2/Mn-Mg-Zn ferrites could be regenerated and recycled to remove strontium and cesium ions from waste streams.
“…Also, at around 3428 cm −1 , O–H stretching appears. Aromatic C=C stretching was determined to be responsible for the 1635 cm −1 absorption band [ 23 ], indicating that the cubic spinel phase was effectively manufactured for the CZ-FN nanostructures. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The growth capacity of the adsorption process with increasing amounts of CZ-FN is predictable because as the quantity of CZ-FN rises, the active site numbers on the surface of CZ-FN increase [ 24 ]. There is an inconsistency between the removal efficiency of each ion and the amount of sorbent, and this clarifies that the functional group on the surface of CZ-FN has a marked preference for Sr (II) over Cs (I); this can be referring to increasing the hydration radius of Cs (I) comparing with Sr (II) [ 23 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…This second model has been utilized to represent the adsorption kinetic for the system of cesium and strontium onto CZ-FN. This model has postulated a chemical rate Associated with the elimination process of the ions and chemisorption [ 23 ]. The second model has been expressed in the non-linearized formula as shown in Eq.…”
Section: Resultsmentioning
confidence: 99%
“…The NiFe 2 O 4 @PNC was used for the adsorption of radioactive Cs (I) and Sr (II), and the adsorption capacity was found to be 232.12 mg/g and 212.5 mg/g, respectively [ 22 ]. Abdel Maksoud et al [ 23 ] synthesized a zinc ferrite-humic acid nanocomposite. The optimum conditions for adsorption of Ba (II) and Cs (I) onto zinc ferrite-humic acid composite were achieved as pH 5, and the adsorption capacities of the magnetic nanocomposite were 62.33 mg/g for Ba (II) and 42.55 mg/g for Cs (I).…”
Carbon-coated ZrO2/Mn-Mg-Zn ferrites nanostructures (CZ-FN) have been prepared as a new inorganic sorbent to remove Cs (I) and Sr (II) from a waste stream. Adsorption of Cs (I) and Sr (II) has been implemented considering different noteworthy parameters, for example, shaking time and the optimum time achieved high adsorption capacity of both ions [103 and 41 mg/g for Sr (II) and Cs (I)] was found 30 min. Also, the impact of pH values was studied; the best pH value for the adsorption process is pH 6. The adsorption saturation capacity of CZ-FN is 420.22 and 250.45 mg/g for strontium and cesium, respectively. The solubility percentage of CZ-FN was calculated utilizing diverse molarities from HNO3, HCl, and NaOH as eluents, the obtained data reveals an increase in the solubility percentage with more increase in the molarity of the eluents. The elevation in the solubility percentage follows the following order; HNO3 < HCl < NaOH. The kinetic studies were applied using the nanolinear form of different kinetic models; it was found that the adsorption process obeys the nonlinear pseudo-second-order. According to equilibrium studies, the Langmuir model has been more accurate than the Freundlich model for adsorption in the case of binary systems. The values of Di for the strontium and cesium are 10−10 m2/s, which displays the chemisorption nature of this process. The greatest values of the desorption process for the strontium and cesium are 96.87% and 94.43 by 0.3 M of HNO3. This indicated that the carbon-coated ZrO2/Mn-Mg-Zn ferrites could be regenerated and recycled to remove strontium and cesium ions from waste streams.
“…The synthesized composite (i.e., ZrP/MSP) exhibited excellent performance for Sr 2+ adsorption over a wide pH range and achieved a much faster adsorption equilibrium (90 min) and a higher maximum adsorption capacity (100.77 mg/g) than the bulk ZrP (i.e., 180 min for 68.88 mg/g) without grafting. Abdel Maksoud [ 16 ] synthesized a zinc ferrite and humic acid (ZFO/HA) nanocomposite material for the effective adsorption of cesium. Its monolayer capacity is 42.55 mg/g, and it was found that the adsorption reaction is a spontaneous endothermic reaction.…”
Salt lake brine originating from Qinghai, China has abundant cesium resources and huge total reserves. The inorganic ion exchangers ammonium molybdophosphate (AMP) and zirconium phosphate (ZrP) have the significant advantages of separating and extracting Cs+ as a special adsorbent. Nevertheless, their high solubility in water leads to a decrease in their ability to adsorb Cs+ in aqueous solutions, causing problems such as difficulty with using adsorbents alone and a difficult recovery. In this work, an environmentally friendly polyurethane sponge (PU sponge) with a large specific surface area is employed as an adsorbent carrier by physically impregnating dopamine-coated AMP and ZrP onto a PU sponge, respectively. The experiment found that under the same conditions, the AMP/PU sponge performs better than the ZrP/PU sponge for Cs+ adsorption. When the amount of adsorbent reaches 0.025 g, the adsorption capacity reaches saturation. The adsorption efficiency remains above 80% when the concentration of Cs+ is 5–35 mg/L. The kinetic calculations show that adsorption is spontaneous, feasible, and has a higher driving force at high temperatures. In addition, the power and mechanism of the interaction between adsorbent and adsorbent are explained using the density functional theory calculation. This efficient, stable, and selective Cs+ adsorbent provides design guidelines.
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