Uranium Adsorption Process Research Articles

Supervised machine learning-based categorization and prediction of uranium adsorption capacity on various process parameters

Existing uranium poses significant dangers to the environment and the general population's health. Within the scope of this study, machine learning techniques were utilized to assess the characteristics that influence uranium adsorption. The adsorbent material, pH, temperature, solid-liquid ratio (SLR), and initial concentration (Ci) values were imported as the feature to evaluate using ML models in this study. The finding concluded that the Convolutional Neural Network (CNN) model performed excellently by attaining an accuracy of 98%, which is very high in classifying low and high levels of adsorption predictions. The Random Forest model was also the best performer for Qe prediction, with the lowest MSE value of 334.45 and the highest Squared-R score of 0.92 for the uranium adsorption process. Permutation Importance analysis indicated that initial concentration had the strongest impact on Qe. Knowing that a good interaction between uranyl ions and adsorbent surface would result in more active sites for trapping radioactive metal, optimizing this parameter can be quite helpful for designing new materials capable of capturing uranium species strongly from solutions. ML model excels at predicting Qe in uranium adsorption and can directly accommodate large datasets and non-linear input parameter-Qe interactions. As noted, the innovation poised to drive ML research has been made possible by recent technological developments in machine learning and can improve while offering new ways of addressing difficult environmental problems.

Selective adsorption of U(VI) in multi-carbonate solutions by g-C3N4/ZrO2-loaded amidoxime polyacrylonitrile

Uranium extraction from seawater is essential for the sustainable development of nuclear energy. Nevertheless, the complex coexistence of ions in seawater can significantly impact the practical uranium species distribution and uranium adsorption process. In this paper, a novel g-C3N4/ZrO2-loaded amidoxime polyacrylonitrile (g-C3N4/ZrO2-AO) was synthesized and investigated as an adsorbent for uranium in U(VI)–CO3, Ca/Mg–U(VI)–CO3, U(VI)–P–CO3 and U(VI)–X–CO3 (X = F, Cl, Br, I) solutions. The uranium adsorption capacity (qe) of g-C3N4/ZrO2-A reached ∼104.5 + 1.5 mg·g1 in U(VI)–CO3 solution, which correlated with a monolayer chemisorption process. High pH and [NaHCO3] decreased qe values because of the electrostatic repulsion and occupation of adsorption sites by excess CO32-. Adsorption of uranium by g-C3N4/ZrO2-AO was impeded in the Ca/Mg–U(VI)–CO3, U(VI)–P–CO3 and U(VI)–X–CO3 (X = F, Cl, Br, I) solutions, possibly due to the formation of various U(VI) complexes. The amidoxime groups inside the g-C3N4/ZrO2-AO have been proved with good uranium selectivity. FTIR and XPS verified the NH2-CN-OH and Zr-OH acted as the primary U(Ⅵ) adsorption sites. This paper opens up opportunities for practical applications of amidoxime polyacrylonitrile-based composites towards the uranium recovery from seawater.

Modified PCN-224 with abundant phosphate functional groups as an efficient absorbent for U(VI) extraction from aqueous solutions

The extraction of U(VI) ions from aqueous solution was considered as a difficult task in the industry. In this study, a phosphate-modified metal-organic framework (PCN-224-HEDP) was designed and synthesized for efficient U(IV) adsorption via a common postsynthetic method of PCN-224 grafting hydroxyethylidene diphosphonic acid. The results of TEM, XPS, FT-IR, XRD and BET indicated the PCN-224-HEDP possessed regular cubic structure, high specific surface area and abundant phosphate functional groups. PCN-224-HEDP exhibited more excellent adsorption capacity for U (VI) than that of PCN-224. Besides, the adsorbent also exhibited great selectivity and recyclability of uranium adsorption. Furthermore, the uranium adsorption process of PCN-224-HEDP was in the control of chemical and monolayer adsorption, and the XPS spectra confirmed that the phosphate groups played a important role in the adsorption process. All results indicated that PCN-224-HEDP was an efficient adsorbent for U(VI) extraction from aqueous solutions.

Selective capture uranium from acidic solution by potassium manganese ferrocyanide

Rapid and effective uranium removal and enrichment from water is necessary for sustainable economic development and ecological protection. In this paper, an efficient adsorbent Prussian blue compound, potassium manganese ferrocyanide (KMnFC), was synthesized and characterized for the separation of uranium. Its effectiveness in U(VI) removal and adsorption amount were evaluated using batch static adsorption experiments. The adsorption effect of the compound on U(VI) in aqueous solution was investigated, and the maximum adsorption capacity of the compound was 469.48 mg g−1. The adsorption-diffusion kinetic study showed that liquid film diffusion was the main rate control step. The adsorption process of uranium (VI) on KMnFC is a heat absorption reaction and chemisorption of uranium ions in exchange with potassium ions occurs. Most importantly, the compound is uranium selective, and its uranium removal ability is relatively effective even under high acidity circumstances.

Solid–liquid extraction of uranium from aqueous solution using Marathon C as a strong cation exchanger resin: kinetic, and isotherm studies

ABSTRACT In this study, Adsorption characteristics of uranium from nitrate media onto a commercially accessible strong cation exchange resin, Marathon C, were investigated. The characteristics of Marathon C, before and after adsorption of uranium, were determined using scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The influence of the different parameters, which may affect the process of uranium adsorption process from synthetic solutions and applying on real sample from uranium purification unit, had been tracked. Specifically, impacts of initial uranium concentration (40–300 mg/L), PH (1–8), phase ratio (0.2–1.2 g/L), contact time (2–360 min.) and temperature (& 25–50°C) on uranium removal, were studied. In addition, the sorption kinetics and equilibrium parameters were assessed. At the optimum conditions, the adsorption capacity of uranium at PH 4, 1 g Marathon C/L and 120 min were found to be nearly 131.58 mg g−1 at room temperature (& 25°C). The kinetics and isotherm studies could show that the uranium adsorption onto Marathon C is following the models of pseudo-second-order and Langmuir isotherm, respectively. The thermodynamic parameters had indicated that the adsorption of uranium is an exothermic and spontaneous process (∆H = −64.27 ± 0.01, ∆G = −22.57 ± 0.02). The detected results of uranium adsorption could reveal that Marathon C is a suitable material for adsorption of uranium from nitrate media and applying on real sample from uranium purification unit.

Thermal activation of kaolinite titanium hydroxide composite for uranium adsorption from aqueous solutions

In the present study, thermally treated kaolinite at 600 ºC was incorporated with titanium hydroxide produced from ilmenite to prepare a novel, low-cost and a promising adsorbent (KT). Different analytical techniques such as FTIR, EDS, SEM were used to determine its structural analysis. Its applicability for uranium uptaking and desorption from its aqueous solutions was investigated by varying controlling conditions including pH, shaking time, initial concentrations, temperature and KT dose weight. Untreated kaolinite showed zero loading capacity and adsorption efficiency towards uranium ions, on the contrary thermal activation and incorporation with Ti(OH)4 improved its performance. Batch results for adsorption experiments showed that loading capacity of (KT) reached 160mgg−1; at pH 5, after only 20 min shaking time. Uranium adsorption process was much closer to a traditional Langmuir adsorption isotherm with a theoretical saturation capacity of 161.3mgg−1. From thermodynamics data, the adsorption process is endothermic in nature which emphasized by elevating temperature has an enhancement effect on uranium adsorption with uptake of 205 mgg−1 at 60 ℃. Uranium adsorption was kinetically fitted with the pseudo-second-order model. KT composite has a high applicability and reusability due to its high resistance to extreme acidity levels.

MOF modified with copolymers containing carboxyl and amidoxime groups and high efficiency U (VI) extraction from seawater

Nuclear energy can effectively alleviate the carbon emission problem caused by fossil fuels. Herein, a highly effective uranium adsorbent MIL-101-SMA-AO modified with carboxyl and amidoxime groups was prepared by a surface-initiated atom transfer radical copolymerization (ATRP) of styrene and maleic anhydride on MIL-101 (Cr) and the subsequent amidoximation. MIL-101-SMA-AO shows ultra-high BET specific surface area (greater than1300 m2∙g−1) and high efficiency adsorption performance, the maximum uranium adsorption capacity reached 1086 mg·g−1. It also shows high selectivity for U (VI) in a simulated seawater and excellent recyclability, the uranium adsorption capacity slightly dropped after five adsorption/desorption cycles. The affecting factors of uranium adsorption process were investigated by batch adsorption experiments under different adsorption conditions. Besides, the results of adsorption kinetics and thermodynamics show that the adsorption process of MIL-101-SMA-AO on U (VI) is controlled by chemical rate and is monolayer adsorption. The synergistic effect of carboxyl and amidoxime groups on the strong chelation with uranium were thought to afford the adsorbent high adsorption property and selectivity for uranium. MIL-101-SMA-AO provides a valid and promising program for the study of uranium extraction from seawater.

Amino-functionalization of hydroxylated SBA-15 for enhanced uranium adsorption from seawater

Uranium extraction from seawater is a strategic deployment to the sustainable development of nuclear energy. However, challenges exist in uranium enrichment because of the extremely low U(VI) concentration and the complexity of seawater. Herein, a novel NH2-functionalized mesoporous hydroxylated SBA-15 (NH2-H-SBA-15), synthesized via post-grafting method was used as the adsorbent in uranium adsorption field. The adsorbent was prepared by reacting between aminosilane and the surface silanol groups of hydroxylated SBA-15. It shows stable adsorption properties in a wider applicable pH range (6–8) because amino groups have better adaptability both in weakly acidic and alkaline environment. Moreover, adsorption kinetic data better fitted pseudo-second-order model, which indicated that the uranium adsorption process belongs to chemical adsorption. Isothermal data better followed the Langmuir model, suggesting a monolayer coverage adsorption mode. Additionally, the adsorption capacity of the NH2-H-SBA-15 is approximatively 115 mg·g−1 within 7 days at pH = 8.1 and 25 °C in uranium-spiked natural seawater. Therefore, the NH2-H-SBA-15 shows the excellent selectivity of uranium in the natural seawater (αU/M > 1) which provides a promising prospect in extracting uranium from seawater.

Removal of uranium from acidic aqueous solution by natural fluorapatite

Removal of uranium(VI) from uranium(VI) containing waste water is urgently needed with the global nuclear energy exploitation. The present work have successfully completed removal of uranium(VI) by natural fluorapatite. The natural fluorapatite before and after adsorption of uranium(VI) was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The experimental results are as follows: (1) At 308 K and pH3, solid-liquid ratio is 0.12 g/L, equilibrium time is 180 min and initial uranyl ion concentration is 100 mg/L, the adsorption capacity of uranium(VI) by natural fluorapatite reaches 620.08 mg/g and the concentration of uranyl ion after adsorption is 25.59 mg/L; (2) The adsorption process of uranium(VI) by natural fluorapatite is in accordance with the pseudo-second-order kinetics and Langmuir isotherm adsorption model; (3) The adsorption of uranium(VI) by natural fluorapatite is a spontaneous and endothermic reaction. The results show that the removal mechanism of uranium(VI) by natural fluorapatite is surface mineralization. After adsorption of uranium(VI) is conducted, two new phases of meta-autunite (Ca(UO2)2(PO4)2.2H2O, Ca(UO2)2(PO4)2.6H2O) are generated on the surface of natural fluorapatite. The meta-autunite can maintain high stability in pH ≥ 3 aqueous solution. Consequently, natural fluorapatite can be used as the promising mineralizer for the purification and solidification treatment of uranium(VI) containing waste water.

Waste non-burn-free brick derived sulfhydryl functioned magnetic zeolites and their efficient removal of uranium(VI) ions

Utilising the general waste such as non-burning brick as raw materials to prepare low-cost zeolite is in line with the green chemical industry and can achieve the purpose of treating waste with waste. Here we use the abandoned non-burning brick powder as raw material, the sulfhydryl functionalized magnetic zeolite composites (MZ-SH) were prepared by combining a series of methods such as hydrothermal synthesis, high temperature melting magnetization, and grafting technology. The samples were characterized by SEM, EDS, XRD, XPS, and FT-IR. The adsorption behavior of MZ-SH on uranyl ions was systematically studied. The results show that the equilibrium adsorption capacity of MZ-SH to uranium(VI) ions was 1285.86 mg/g under the optimal adsorption conditions with t of 270 mins, T at 35 ℃, C0 being 35 mg/L, pH at 6.0, and m by 0.025 g/L. Its adsorption isotherm complies with the Langmuir adsorption model, while the adsorption kinetics conforms to the quasi-second-order adsorption kinetic model. The adsorption type is mainly chemical adsorption with type of monolayer distribution on the surface. Adsorption thermodynamics shows that the adsorption process was spontaneous at 25–45 ℃. FT-IR and XPS analysis showed that sulfhydryl, –OH, Al-O and Si-O played an important role in the adsorption process of uranium (VI) ions by MZ-SH. It indicates that the uranium(VI) ions prefer binding with –OH and sulfhydryl groups and there is also showing ion exchange between uranium(VI) ions and Al-O and Si-O groups.

Phytic acid-decorated porous organic polymer for uranium extraction under highly acidic conditions

Although various kinds of adsorbents have good uranium adsorption capacity, they still meet the challenge in capturing uranium under highly acidic condition. Therefore, efficiently extracting uranium under strong acidic condition become the pursuit of researchers. In this study, a new phytic acid decorated porous organic polymers (POPs) named MA-U-PA was prepared by synthesizing a organic framework (MA-U) using melamine and uracil and with subsequent phytic acid modification. The results showed that the excellent stability of the prepared organic framework and strong uranium chelating ability of phytic acid endowed the as-prepared material being an excellent adsorbent under strong acidic condition. The adsorption capacity achieved 106.7 mg·g -1 at the pH of 1 which was much higher than that of MA-U and most of other adsorbents. The study of modification mechanism confirmed that the hydrogen bonds interaction of phytic acid with MA-U lead to the successful modification. In addition, the phosphonate groups of PA was mainly the active groups chelated with uranium. Moreover, the uranium adsorption process of MA-U-PA was in accordance with the pseudo-second-order kinetic and Langmuir isothermal model. The newly prepared phytic acid decorated porous organic material could achieve efficient uranium capturing from highly acidic nuclear wastewater. • The raw materials were melamine, uracil and phytic acid which were relatively green and nontoxic. • The organic framework made the adsorbent stable and phosphoric groups on the surface endowed the adsorbent capturing uranium efficiently under strong acidic conditions. • The uranium adsorption capacity of MA-U-PA attained to 106.7 mg·g -1 under pH of 1, higher than most of other adsorbents.

Efficient uranium adsorbent with antimicrobial function constructed by grafting amidoxime groups on ZIF-90 via malononitrile intermediate

Herein, a dual-function Zeolitic Imidazole Frameworks (ZIFs) ZIF-90 grafted with malononitrile by Knoevenagel reaction and following with an amidoximation reaction to form an efficient U (VI) adsorbent (ZIF-90-AO). The strong chelation power of amidoxime groups (AO) with uranium and ZIF-90’s mesoporous structure afforded ZIF-90-AO high maximum uranium adsorption capacity of 468.3 mg/g (pH = 5). In addition, the factors affecting uranium adsorption process were investigated by a batch of adsorption tests under different adsorption conditions. ZIF-90-AO displayed good selectivity to UO22+ in the solution containing multiple co-existing ions and good regeneration property. More importantly, ZIF-90-AO showed excellent antimicrobial property against both E. coli and S. aureus. Therefore, ZIF-90-AO is a U-adsorbent with great application value for removing U (VI) from wastewater due to the high U (VI) adsorption capacity in weak acid condition and good anti-biofouling properties.

Nanocellulose aerogel for highly efficient adsorption of uranium (VI) from aqueous solution

Cellulose nanofibers (CNFs) aerogel was prepared via simple covalent crosslinking and freeze-drying method. The porous cellulose aerogel possessed high specific surface area and high metal-chelating capacity, which showed fast adsorption kinetics and high adsorption capacity (440.60 mg g−1) in static uranium adsorption process. In the dynamic filtration system, the maximum adsorption capacity reached 194 mg g−1 with the initial concentration of 10 mg L−1. In addition, the CNFs aerogel possessed excellent selectivity and good regeneration ability for uranium adsorption. The integrated analyses of attenuated total reflection Fourier transform infrared (ATR-FTIR), X-Ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) suggested that the predominant UO22+ species formed inner-sphere surface complexes with two active carboxyl groups in the coordination model. This strategy may provide a sustainable route for development of efficient biomass-based adsorbents for selective uranium removal from aqueous solution.

Facile synthesis of 2,5-dihydroxy-1,4-benzoquinone glyoxal resin with high capacity and selectivity for uranium recovery in aqueous solution

A novel resin (DBGR) with α-hydroxy ketone groups was easily synthesized via condensation of 2,5-dihydroxy-1,4-benzoquinone with glyoxal, which was characterized by XPS, FTIR, SEM, TGA, EDS and BET. Experiments show that DBGR has a good uranium adsorption capacity of 741 mg g−1 and a high selectivity of uranyl ion in the presence of competing metal ions such as Ag+, Ca2+, Co2+, Mg2+, Sr2+ and Cs+. Adsorption isothermal and kinetic studies indicate that the uranium adsorption process of DBGR fits well with Langmuir isotherm and pseudo-second-order models. Analysis shows DBGR binds the uranyl ion via C=O, O–C–O and C–OH functional groups.

Photothermal enhancement of uranium capture from seawater by monolithic MOF-bonded carbon sponge

Extraction of radioactive uranium from the natural seawater is regarded as one of the most promising ways to address the shortage of uranium resources. As a kind of potential uranium adsorbent, more attention has been paid to metal–organic framework materials (MOFs) due to large specific surface area and high ion selectivity. Currently, however, MOF adsorbents are hardly applied to the real seawater in view of the relatively low uranium adsorption capacity and recyclable issues. Herein, we present the monolithic MOF adsorbent with photothermally enhancing uranium adsorption capacity. Carbon sponge (CS) substrate with macroporous open cell structure was used as excellent photothermal conversion material. Zr-MOF (UiO-66-NH2) crystals were in situ grown on the fibrils network of polydopamine (PDA) pre-coated CS to obtain UiO-66-NH2@CS-PDA adsorbent. It is found that UiO-66-NH2 coating with perfect coverage and good adhesion has a high mass loading (>85 wt%). As a result, UiO-66-NH2@CS-PDA adsorbents exhibited the advantage of high-selectivity, high-affinity and cycling stability. Compared with the dark condition, the uranium adsorption amount was increased by 32.37% after 4 weeks in the natural seawater under simulated solar irradiation, which was mainly ascribed to the endothermic behavior of uranium adsorption process. Moreover, the elasticity attribute of CS was essential for sustenance of volume variation buffering during seawater flow. As a recyclable and favorable elastic large-scale monolithic MOF adsorbent, UiO-66-NH2@CS-PDA holds great promise for extracting uranium from the natural seawater.

Solid waste sub-driven acidic mesoporous activated carbon structures for efficient uranium capture through the treatment of industrial phosphoric acid

This research study presents bio-char manufacturing from a solid waste (rice-straw) by low-temperature pyrolysis as a new trend. The as-produced char (named as BC) and its sub-driven hydrochloric and nitric acids activated carbons (labeled as HAC, and NAC respectively) were employed as adsorbents for uranium removal from a commercial grade of phosphoric acid. Morphological and structural characteristics of the presented carbonaceous structures were accomplished utilizing Fourier Transform Infrared (FTIR) Spectroscopy and Transmission Electron Microscopy (TEM). The uranium adsorption process via these three structures was then performed via the batch technique at various operating conditions. It was observed that the labeled structure as HAC has an increased adsorption capacity, compared to the other two adsorbents. Thus, it could attain a higher level of uranium species removal than both NAC and BC. Hence, HAC could be subsequently concluded as the structure of most suitability, among the three adsorbents, for uranium taking out from industrial phosphoric acid. The collected adsorption results by the three structures had been next examined by diverse kinetic and isotherm models. By all structures in this study, the presented adsorption processes were found to follow the pseudo-second-order model and perfectly match the Langmuir isotherm model. The applied three sorbents’ sorption capacity was 2.3, 2.5, and 3.3 for BC, NAC, and HAC, respectively. This confirms that the bio-char activation with hydrochloric acid has the most positive impact on bio-char’s sorption characteristics The various thermodynamics factors ( Δ H , Δ G and Δ S ) could reveal that these processes are exothermic exploits. • Conversion of a type of solid waste into carbon. • Activation of carbon by acids obtaining effective porous sorbents. • Application of these adsorbents in uranium recovery from industrial media. • Studying kinetics and thermodynamics parameters.

Effective biosorption of uranium from aqueous solution by cyanobacterium Anabaena flos-aquae.

Anabaena flos-aquae, a typical species of cyanobacterial bloom, was employed as a useful biosorbent for uranium removal. Batch experiments were conducted to examine the effects of different parameters on the uranium uptake amount of Anabaena flos-aquae. The maximum adsorption capacity of 196.4mg/g was obtained under the optimized experimental conditions. The calculations of kinetic and thermodynamic results proved the adsorption process was endothermic, chemisorption, and spontaneous. The adsorption of uranium onto Anabaena flos-aquae was better defined by the Langmuir model, which indicated the process was a monolayer sorption. In addition, the characterization of the biosorbent before and after uranium sorption implied that the dominant functional groups participated in the uranium adsorption process were hydroxyl, amino, and carboxyl. In conclusion, the environmentally friendly and biocompatible characteristics of Anabaena flos-aquae suggest that it can be a promising biosorbent for uranium removal.

Rapid Room-Temperature Preparation of Hierarchically Porous Metal-Organic Frameworks for Efficient Uranium Removal from Aqueous Solutions.

The effective removal of uranium from an aqueous solution is a highly valuable process for the environment and health. In this study, we developed a facile and rapid method to synthesize hierarchically porous Cu-BTC (RT-Cu-BTC) using a cooperative template strategy. The as-synthesized RT-Cu-BTC exhibited hierarchically porous structure and excellent thermostability, as revealed by X-ray powder diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. Compared with conventional metal–organic frameworks (MOFs) and zeolites, the obtained RT-Cu-BTC exhibited enhanced adsorption capacity (839.7 mg·g−1) and high removal efficiency (99.8%) in the capture of uranium (VI) from aqueous solutions. Furthermore, the conditions such as adsorbent dose, contact time, and temperature in adsorption of uranium (VI) by RT-Cu-BTC were investigated in detail. The thermodynamics data demonstrated the spontaneous and endothermic nature of the uranium (VI) adsorption process. The Langmuir isotherm and pseudo-second-order models could better reflect the adsorption process of uranium (VI) onto RT-Cu-BTC. In addition, the as-synthesized RT-Cu-BTC showed excellent stability in removing uranium (VI) from an aqueous solution. This work provides a facile and rapid approach for fabricating hierarchically porous MOFs to realize a highly efficient removal of uranium (VI) from aqueous systems.

Removal of uranium from aqueous solutions using amine-functionalized magnetic platelet large-pore SBA-15

ABSTRACT A novel amine-functionalized magnetic large-pore SBA-15 obtained via in situ approach and the post-grafting method was employed as a new adsorbent for removal of uranium from aqueous solutions. Results indicated that the as-prepared adsorbent exhibited fast adsorption rates in the first hour, at the optimum pH 6. The adsorption process was fitted well to the Langmuir isothermal and the maximum adsorption capacity obtained from the Langmuir model was 395.05 mg/g for NH2-M-SBA-15 sample. The kinetics of the uranium adsorption process over NH2-M-SBA-15 was described by pseudo-second-order kinetics. In comparison with the pristine large-pore SBA-15, the adsorption performance of NH2-M-SBA-15 was improved significantly. The thermodynamic parameters revealed that the adsorption of uranium on the material was spontaneous and endothermic. Furthermore, excellent recyclability could be achieved even after four consecutive adsorption-desorption cycles.

Fabrication of magnetic functionalized m-carboxyphenyl azo calix[4]arene amine oxime derivatives for highly efficient and selective adsorption of uranium (VI)

A novel material called m-carboxyphenyl azo calix[4]arene amine oxime derivatives (M-CCAOD) was synthesized by diazotization-coupling reaction and substitution reaction. Then the composite consisting of Fe3O4 and M-CCAOD was prepared through a facile self-assembly method. The as-synthesized Fe3O4/M-CCAOD composite was used to remove U(VI) from aqueous solutions under different conditions. The calculated data indicate that the adsorption process of uranium by Fe3O4/M-CCAOD is an exothermic spontaneous process, which well fits with the pseudo-second-order and Freundlich model. More significantly, the composite showed high selectivity for uranium and excellent reusability, demonstrating that Fe3O4/M-CCAOD may be a potential uranium adsorbent material.