INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Weisheng Dai,Yao Wang,Weijuan Guo,Guofu Wang,Muqing Qiu
The effects of Fe(II) and humic acid on U(VI) immobilization onto oxidized carbon nanofibers (Ox-CNFs, pyrolysis of bacterial cellulose) were investigated by batch, spectroscopic and modeling techniques, with results suggesting that, Ox-CNFs exhibited fast adsorption rate (adsorption equilibrium within 3 h), high adsorption performance (maximum adsorption capacity of 208.4 mg/g), good recyclability (no notable change after five regenerations) in the presence of Fe(II) towards U(VI) from aqueous solutions (e.g., 40 % reduction and 10 % adsorption at pH 8.0), which was attributed to the various oxygen-containing functional groups, excellent chemical stability, large specific surface area and high redox effect. U(VI) adsorption increased with increasing pH from 2.0 to 5.0, then high-level plateau and remarkable decrease were observed at 5.0–6.0 and at pH > 6.0, respectively. According to FT-IR and XPS analysis, a negative correlation between U(VI) reduction and organic in the presence of Fe(II) implied that U(VI) reduction was driven by Fe(II) while inhibited by humic acid. The interaction mechanism of U(VI) on Ox-CNFs was demonstrated to be adsorption and ion exchange at low pH and reduction at high pH according to XPS and surface complexation modeling. These findings filled the knowledge gaps pertaining to the effect of Fe(II) on the transformation and fate of U(VI) in the actual environment. This carbon material with distinctive performance and unique topology offers a potential platform for actual application in environmental remediation.
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PubMed
高影响因子
Water
·
2024
·Vol. 16
·期 13
·1795
·
IF 3
Mengxue Li,Lanbao Zhu,Jing Wang,Li Ma,Zhengwei Pan,Wenwei Ji,Xiaoyu Sun,Ruping Li,Xia Li,Shilong Duan,Yule Tao
Mn-substituted FeOOH with different Mn/(Mn + Fe) molar ratios are synthesized, and characterized using FESEM, XRD, FTIR, ICP-OES, BET, Zeta potential, TG-DSC, XPS, and VSM. The results show that the actual doping amounts of Mn are 0%, 3.05%, 6.13%, 9.04%, 12.70%, and 15.14%, respectively. The substitution of Mn promotes the transformation of goethite from FeOOH to MnFe2O4, resulting in a saturation magnetization intensity of up to 14.90 emu/g for G-Mn15%, laying a theoretical foundation for magnetic recovery. The specific surface area of Mn-substituted FeOOH increases from 57.15 m2/g to 315.26 m2/g with an increasing Mn substitution amount. Combined with the abundant oxygen-containing functional groups such as -OH, Fe-O, and Mn-O on the surface, sufficient active sites are provided for the efficient adsorption of U(VI). The TG-DSC analysis results indicate that the substitution of Mn improves the thermal stability of goethite. In addition, XPS analysis results indicate that the substitution of Mn leads to the conversion of Fe3+to Fe2+in goethite, and the conversion of Mn2+to Mn3+replaces Fe3+in the structure of goethite. Fe-O and Mn-O coordinate participate in the adsorption and reduction process of U(VI). The batch experiment results show that the substitution of Mn promotes the adsorption performance of goethite for U(VI). When T = 303 K, pH = 4.0, m/V = 0.5 g/L, and I = 0.01 mol/L NaCl, the maximum adsorption capacity of G-Mn15% for U(VI) is 79.24 mg/g, indicating the potential value of Mn substitution for goethite in the treatment of uranium-containing wastewater.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Hongwei Wang,Xianliang Ren,Fang Wu,Gaobin Liu,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
MXenes have demonstrated exceptional potential in the adsorption of uranium (U(VI)) from wastewater. However, significant challenges remain in the investigation of its adsorption capacity and mechanism. To enhance the adsorption capacity of Ti 2 CT x , this study conducted alkalization experiments on Ti 2 CT x and subsequently prepared Ti 2 C(OH) 0.13 @SA aerogel spheres by combining alkalized Ti 2 C(OH) 0.13 with sodium alginate (SA). The results indicated that alkalization effectively increased the proportion of OH functional groups. After alkalization treatment, Ti 2 C(OH) 0.13 exhibits a significantly enhanced adsorption capacity, reaching up to 951 mg g −1 , which represents more than a twofold increase compared with untreated Ti 2 CT x . The adsorption follows pseudo-second-order kinetics and the Langmuir isotherm model, suggesting chemical and monolayer adsorption, respectively. Thermodynamic studies reveal an endothermic adsorption process. DFT calculations demonstrate that the OH functional group forms chemical bonds with U(VI), promoting reductive adsorption. Aside from electrostatic adsorption, XPS analysis confirms Ti(II) oxidation and U(VI) reduction. This study further investigates the adsorption capacity of Ti 2 C(OH) 0.13 @SA aerogel spheres in simulated seawater environments. It is found that even at an ultra-low concentration of U(VI) as low as 3.3 μg/L, these aerogel spheres still exhibit significant adsorption performance, with an adsorption capacity reaching up to 3.21 mg g −1 , highlighting their substantial potential for applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Detao Li,Huamin Wang,Feiqiang He,Zhi Gao,Limin Zhou,Di Cai,Li Xu,Xi Wu,Zhen Yang,Jinbo Ouyang
The nuclear industry's production generates significant uranium-containing wastewater. Owing to radioactivity, this wastewater seriously threatens environmental safety and human health, becoming a major bottleneck for nuclear energy's sustainable development. Adsorption-based uranium extraction from radioactive wastewater represents a promising strategy, as it facilitates the recovery of a valuable resource while significantly mitigating environmental pollution. Chitosan contains active functional groups like amino groups and hydroxyl groups, this study employed chitosan cross-linking and composite technology, supplemented by freeze-drying methods. Based on the synergy of multi-functional groups, a composite foam adsorbent (HPC) was constructed, which consists of phytic acid-modified layered hydrotalcite rich in phosphate groups and chitosan/carboxymethyl cellulose. This adsorbent was employed for the removal of U(VI) from aqueous solutions, and its adsorption performance was systematically evaluated under various conditions. The results demonstrated that under optimal conditions, the maximum adsorption capacity for U(VI) reached 272.28 mg/g. The adsorption process was well described by the pseudo-second-order kinetic model and the Langmuir isotherm, indicating monolayer chemisorption. Thermodynamic studies revealed that the adsorption is spontaneous and exothermic in nature. The HPC adsorbent possesses a high specific surface area and is rich in diverse functional groups, including carboxyl, hydroxyl, amino, and phosphate groups. The synergistic effect among these functional groups enhances U(VI) adsorption through mechanisms such as chemical complexation, ion exchange, and isomorphic substitution. These findings suggest that HPC is a promising high-performance adsorbent for the treatment of uranium-containing radioactive wastewater.
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Applied Sciences-Basel
·
2026
·Vol. 16
·期 9
·4093
·
IF 2.9
Cheng Chen,Pengcheng Xian,Xiong Zhang,Liang Huang,Fengyao Fan,Chunhai Lu,Yanjing Yang
In this study, chicken bone biochar (CBC) was prepared from waste chicken bones via oxygen-limited pyrolysis. A magnetic component (Fe3O4) was introduced, and the composite was embedded in a sodium alginate (SA) gel network, successfully constructing magnetic chicken bone biochar/sodium alginate composite gel beads (M-CBC/SA). The experimental results showed that under the conditions of pH = 4.5, 25 °C, and an adsorbent dosage of 0.5 g/L, the removal efficiency of M-CBC/SA toward 50 mg/L U(VI) reached 91.67%, corresponding to an adsorption capacity of 91.67 mg/g. The adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm model, with a theoretical maximum adsorption capacity of 322.58 mg/g, indicating that the adsorption was dominated by monolayer chemisorption. The material exhibited excellent magnetic separability and good anti-interference ability against coexisting ions such as K+, Na+, Cl−, and SO42−, and its adsorption behavior was only weakly affected by ionic strength. Characterization by XRD, FTIR, XPS, SEM-EDS and other techniques revealed that the immobilization mechanism of U(VI) involved the synergistic effects of dissolution–precipitation (the formation of a new autunite phase), surface complexation (involving hydroxyl and phosphate groups), ion exchange (exchange with Ca2+), and electrostatic attraction. Using waste chicken bones as the raw material, this composite achieves both efficient uranium immobilization and convenient magnetic separation, fully embodying the environmental concept of “treating waste with waste”, and shows promising application prospects in the treatment of uranium-containing wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Lijun Guo,Liangqiong Peng,Jiheng Li,Wenhua Zhang,Bi Shi
The simultaneous removal and selective separation of U(VI) and Th(IV) via adsorption remain challenging due to their strong mobility, reactivity, and similar chemical properties. Thus, a surface-functioned lignin nanoparticle (AL-PEI) was synthesized to adsorb U(VI)/Th(IV) in a unitary system via a pH-dependent process. In alkaline solution, AL-PEI exhibited excellent adsorption performance, and the maximum adsorption capacities for U(VI) and Th(IV) reached 392 and 396 mg/g, respectively. Discrepantly in acidic solution, the adsorption performance of AL-PEI for U(VI) could still reach a high capacity (332 mg/g), whereas highly limited adsorption capacity (less than 40 mg/g) for Th(IV) was obtained, and the separation factor of U(VI) from U(VI)-Th(IV) matrix significantly reached 6662 in 3 M of the HNO 3 medium. The simultaneously efficient adsorption in alkaline solution and highly selective separation performance in acidic solution of AL-PEI also showed excellent anti-ions interference capacities, high reusability, and strong stability. This study is the first to apply lignin fabricating radiation-resistant adsorbent material, and the adsorbent displays good performance for U(VI)/Th(IV) removal and selective separation via a novel pH-dependent process, which is important to the green and sustainable development of nuclear energy and environmental protection.
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Polymers
·
2020
·Vol. 12
·期 1
·151
·
IF 3.426
Juan Tan,Shuibo Xie,Guohua Wang,Chuck Wah Yu,Taotao Zeng,Pingli Cai,Huayong Huang
In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.Keywords:orthogonal experiments;U(VI);thermo-sensitive hydrogel;adsorption;wastewater treatment
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hong Li,Diyun Chen,Weixing Han,Jun He,Gang Song,Lingjun Kong,Minhua Su
Wastewater from uranium mining activities is highly acidic and contains uranium, thereby posing severe risks to the ecological environment and human health. Accordingly, uranium purification is extremely crucial. Herein, we delicately designed a novel adsorbent of diethylenetriaminepenta(methylenephosphonic) acid (DTPMP) and meso -SiO 2 modified γ-Fe 2 O 3 (γ-Fe 2 O 3 @SiO 2 @DTPMP, denoted as FSD), and found that the adsorbent can remarkably boost the removal performance of U(VI) under highly acidic conditions. The removal efficiencies of U(VI) by FSD are 90.26 % and 99.81 % in strong acidic solutions of pH = 1.0 and pH = 2.0, respectively, which are much higher than most of the reported adsorbents. Importantly, FSD exhibits high adsorption capacity (51.45 mg/g) and excellent anti-interference, even the wastewater stream contained a lot of organic substances ( e.g. , fulvic acid), cations ( e.g. , K + , Na + , Mg 2+ , NH 4 + , Zn 2+ , Co 2+ , etc.), radioactive nuclides ( e.g. , Cs + and Sr 2+ ). After five cycles, the adsorption efficiency and desorption efficiency of FSD only reduced by 8.83 % and 9.61 %, respectively, which are mainly attributed to the unique structures and good chemical stability of FSD. The removal of U(VI) by FSD is a heterogeneous adsorption process which is dominated by chemical adsorption, mainly involving surface coordination complexation. Multiwfn wavefunction and VMD programs based on density functional theory (DFT) further analyzed and visualized the interaction sites and relative strengths of reactions. The results of detailed characterization analysis and theoretical calculations confirmed that the highly efficient U(VI) removal by FSD is mainly ascribed to the strong coordination of the phosphate groups and amino nitrogen atoms in DTPMP with UO 2 2+ . Therefore, this study provides a promising strategy for the removal of U(VI) in strongly acidic wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Liping Liang,Yishun Wu,Weishou Tan,Fenfen Xi,Yun Zhang,Jinhui Zhao,Xu Meng,Jianfeng Ma
This study successfully synthesized g-C 3 N 4 -S-nZVI and rGO-S-nZVI composites for U(VI) sequestration and for the assessment of microbial toxicity to bacteria and fungi. The maximum U(VI) adsorption capacities of g-C 3 N 4 -S-nZVI and rGO-S-nZVI were 662.3 mg/g and 578.0 mg/g at pH = 6.0, respectively. The adsorption kinetics followed the pseudo-second-order model, and the isotherm data were well-described by the Langmuir model. The composites had a good application prospect due to their excellent resistance to ionic interference and favorable recyclability. Analysis via X-ray absorption near-edge structure (XANES), X-ray photoelectron spectroscopy (XPS), and extended X-ray absorption fine structure (EXAFS) confirmed that U(VI) removal occurred primarily through chemisorption, with uranyl ions forming a bidentate mononuclear edge-sharing coordination complex on the iron oxide surface. The presence of reactive oxygen species inhibited the reduction of U(VI) to U(IV). Fungal toxicity assays indicated good biocompatibility of g-C 3 N 4 and rGO, while S-nZVI and its composites exhibited significant inactivation of Arthrographis arxii . The inactivation mechanism involves the synergistic effects of physical contact, dissolved Fe 2+ , and ROS generation. Sediment microbial community analysis revealed that S-nZVI caused the greatest disturbance to bacterial communities, while the composites formation mitigated their influence. It is worth noting that g-C 3 N 4 -S-nZVI exhibited the most significant anti-fungal efficacy, whereas rGO-S-nZVI had a relatively small impact on bacterial and fungal communities. This research not only provides an effective method for removing U(VI), but also clarifies the impact of material use on environmental microorganisms.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jiangnan Huang,Shuang Chen,Yingjie Ruan,Hao-Fan Wang,Hongjuan Wang,Hao Yu,Yonghai Cao
The efficient uptake of U(VI) ions from the real seawater as the nuclear energy source was of paramount importance. Here, the three-dimensional (3D) flexible carbon felts (FCFs) with N dopants and oxygen-containing groups (o-NFCF) were prepared via the solvothermal method. The obtained FCFs were used as the adsorbents for the uptake and enrich of U(VI) by a flow-through electro-sorption operation in the laboratory-designed device. The pristine FCF (pFCF) displayed a 5.0 mg/g capacity under the initial conditions of 10 mg/L U(VI), which was improved with the presence of an electric field (7.2 mg/g, 0.6 V). The o-NFCFs with 2.58 at.% N dopant and 11.09 at.% oxygen functionalities on the surface would lead to the enhanced performance (11.8 mg/g). This was facilitated by the aid of an electric field (18.8 mg/g, 0.6 V) with a Q max of 44.6 mg/g as well. The decreased activity was observed in the simulated seawater (16.4 mg/g) and real seawater (10.6 mg/g), respectively, probably ascribed to the coexistence of organisms and complex ions. The uptake stability of U(VI) from the real seawater was then observed, ascribed to the desorption capability of U(VI) from the surface of o-NFCF. In this process, o-NFCF could be in-situ regenerated simultaneously. By doing so, the enrichment of U(VI) to 5.85 mg/L concentration from a real seawater was obtained. Mechanistic studies and DFT simulations indicated that the electrochemical properties of 3D-NFCF materials dominated the electro adsorption of U(VI).
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Jisheng Kou,Xiangyue Wei,Hui Wu,Wensheng Linghu,Guodong Sheng,Yixin Pan
The removal of U(VI) and Se(IV) in an aqueous solution was investigated by batch experiments and characterized by spectroscopy techniques such as FTIR, XRD, SEM, TEM, XPS, using FeS@h-BN nanocomposite which was synthesized by hexagonal BN (h-BN) as the stabilizer anchored onto FeS nanoparticles to address the agglomeration of the FeS. The effects of pH, adsorbent concentration, contact time, and initial concentration of U(VI) and Se(IV) on FeS@h-BN adsorption U(VI) and Se(IV) were studied. Results showed that FeS@h-BN nanocomposite showed an excellent decontamination performance due to the large surface area and surface potential. A pseudo-second-order kinetic model well reflected the kinetic adsorption of U(VI) and Se(IV) which indicated chemical interaction mainly contributed to U(VI) and Se(IV) adsorption on FeS@h-BN. The adsorption process of removing U(VI) fitted Freundlich and D-R models well which presented multilayer adsorption on the nanocomposite surface. The Langmuir model fitted well with sorption isotherm data of Se(IV) removal displaying a single monolayer reaction between Se(IV) and FeS@h-BN. The adsorption of U(VI) and Se(IV) was high pH-dependent since pH affected the FeS@h-BN nanocomposite surface potential and U(VI) and Se(IV) speciation. The maximum sorption capacity of U(VI) and Se(IV) reached 163.11 and 196.39 mg/g, respectively. These results reveal that FeS@h-BN nanocomposite could be promising for the effective decontamination of U(VI) and Se(IV).
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Binliang Wang,Yingying Li,Junli Zheng,Yiwei Hu,Xiaojun Wang,Baowei Hu
The utilization of Microcystis biomass is an urgent issue in the mitigation of cyanobacterial bloom. In this study, Microcystis -derived biochar (MB) and Fe 3 O 4 -modified biochar (Fe 3 O 4 /MB) were fabricated for the U(VI) elimination. The results showed that U(VI) sorption process by either MB or Fe 3 O 4 /MB was pH-dependent and ionic strength-independent. The maximum sorption capacity of MB was higher than that of Fe 3 O 4 /MB. According to the analysis of X-ray photoelectron spectroscopy, U(VI) sorption on both MB and Fe 3 O 4 /MB was mainly ascribed to the surface complexation between U(VI) and oxygen-containing functional groups on the surface of MB. Fe 3 O 4 particles on the surface of MB didn’t provide extra active sites for the sorption of U(VI), but it enabled the adsorbent to be magnetically separated. Five consecutive sorption/desorption cycles verified the good reusability of Fe 3 O 4 /MB in this study. Therefore, the investigation is not only meaningful for the utilization of nuisance biomass from cyanobacterial blooms, but also provides novel adsorbents for the U(VI) removal from aqueous solutions.
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高影响因子
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