SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Long Huo,Feixiang Gao,Maokui Li,Junhang Wang,Xuanyu Li,Jianwei Bai,Haoyuan Wu,Hayinaer Azhati,Chunhong Zhang
The sustainable development of nuclear power hinges on accessing sufficient and stable uranium resources. Although the ocean contains abundant uranium, its low concentration and the presence of various interfering ions pose great challenges to extracting uranium from seawater. Herein, the sodium alginate-polyamidoxime/hyperbranched polyamide hydrogel spheres with high stability and adsorption capacity were developed. The gel spheres are molded by crosslinking sodium alginate with Ca 2+ and form a three-dimensional network structure through the covalent cross-linking of glutaraldehyde, which endows the hydrogel spheres with great stability and forms a pore structure. Accordingly, the unique spherical structure endows it with unparalleled recovery performance, enhancing its ability to efficiently recycle after uranium extraction. Adsorption experiments show that the maximum capacity reaches 537.8 mg·g −1 at a pH of 6. Notably, the hydrogel spheres can adsorb uranium over a larger pH range and maintain morphological stability, which makes them suitable for uranium recovery in complex situations like seawater. Furthermore, the adsorption capacity was successfully preserved in five adsorption–desorption cycles, with a high removal rate from 95.07 % to 87.37 %. The dynamic cycle experiment reveals that uranium extraction in real seawater can still reach 82.59 %, indicating a high potential for seawater applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Membranes
·
2023
·Vol. 13
·期 9
·781
·
IF 4.2
Jiaming Gao,Yongchao Sun,Feifei Kang,Fei Guo,Gaohong He,Hanli Wang,Zhendong Yang,Canghai Ma,Xiaobin Jiang,Wu Xiao
Mixed matrix membranes (MMMs) generally have some fatal defects, such as poor compatibility between the two phases leading to non-selective pores. In this work, PIM-1 was chosen as the polymer matrix, and UiO-66 modified with amidoxime (UiO-66-AO) was used as the filler to prepare the MMMs. In the MMMs, the amino and hydroxyl groups on UO-66-AO form a rich hydrogen bond network with the N and O atoms in the polymer PIM-1 chain to improve the compatibility between the polymer matrix and the filler. In addition, the selective adsorption of CO2by the amidoxime group can promote the transport of CO2in the membrane, which enhances the gas selectivity. The CO2permeability and CO2/N2selectivity of UiO-66-AO@PIM-1 MMMs are increased by 35.2% and 45.2% compared to pure PIM-1 membranes, reaching 7535.5 Barrer and 26.9, surpassing the Robeson Upper Bound (2008) and close to the 2019 Upper Bound. After 38 days of the aging experiment, the CO2permeability is approximately 74% of the original. The results show that the addition of UiO-66-AO has an obvious effect on improving the aging properties of the membrane. The UiO-66-AO@PIM-1 MMMs have a bright prospect for CO2separation in the future.Keywords:amidoxime;UiO-66-AO;mixed matrix membrane;PIM-1;CO2/N2separation
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Chen Cheng,Guangsheng Zeng,Zhiqiang Huang
3-Ethyl-4-pyridylamidoxime (EPA) and 3-methyl-5- tert -butyl-4-pyridylamidoxime (MBPA) were introduced as the collectors in the flotation and enrichment of malachite from calcite and quartz. Compared with MBPA and the traditional collector benzohydroxamic acid (BHA), EPA exhibited a better flotation performance. Its collecting ability to malachite was stronger than BHA, and its selectivity toward calcite and quartz was better than MBPA. In the absence of Pb 2 + ions, 2.0 × 10 −4 mol/L EPA at pH 8.0 could recover about 86 % malachite, 20 % calcite and 22 % quartz. Under the same conditions, BHA floated out around 58 % malachite, 27 % calcite and 10 % quartz. The contact angle and SEM proved that EPA could enhance the surface hydrophobicity of malachite via corrosion to produce more active sites for its heavy adsorption. FTIR and XPS revealed that EPA would chelate with the surface Cu atom to form -O-Cu and -N-Cu bonds. EPA owned stronger electron-donating ability and worse electron-accepting ability than BHA, which brought a stronger chemical reactivity. Moreover, its isomer could further enhance the adsorption ability onto malachite. The novel amidoxime collector EPA was able to efficiently lead-free enrich malachite and enhance the industrial capacity to treat copper oxide ores.
研究领域:
矿物加工工程
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化学工程与技术
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DOI
高影响因子
Journal of Materials Chemistry A
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2024
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IF 10.7
You Huang,Shufen Zou,Shan Lin,Bing Na,Zhuyao Li,Shuang Zhang
It is still a challenge to synthesize high-performance adsorbents for uranium extraction from seawater. The stable uranyl tricarbonate complex in seawater seems to preclude coordination of uranyl ions by adsorbents. This study reports 3D networked colloidal particles consisting of polyamidoxime (PAO) and sodium polyacrylate (PAA-Na) segments via competitive conversion between amidoximation and hydrolysis in NaOH aqueous solutions. PAA-Na can promote the dissociation of uranyl ions via ion exchange for high-efficiency coordination by PAO. As a result, the colloidal particles, with high selectivity for uranyl ions, reach an outstanding uranium uptake capacity of 17.8 mg U per g in real seawater after 20-day adsorption.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Meng Cao,Guangsheng Luo,Qin Peng,Lushuang Wang,Yue Wang,Shilei Zhao,Hui Wang,Jiacheng Zhang,Yihui Yuan,Ning Wang
Effective uranium extraction from seawater can contribute greatly for meeting the needs of low carbon energy. Extensive studies have been conducted on polyamidoxime-based (PAO-based) adsorbents for their exceptional uranium adsorption capabilities. However, the salt-shrinkage effect severely hinders the extraction of uranium from seawater using traditional PAO-based adsorbents. This study synthesizes a novel semi-interpenetrating polymer network hydrogel, designated as PAO/PMPC-SH, using a free-radical polymerization approach utilizing PAO and zwitterionic poly (2-methacryloyloxyethyl phosphorylcholine) (PMPC). The incorporation of the PMPC component endows the adsorbent with exceptional resistance to salt shrinkage owing to the antipolyelectrolyte effect. This characteristic facilitates the diffusion of uranyl ions within PAO/PMPC-SH, even in a high-salt environment with a salt concentration as high as 25 wt%, thereby exposing the uranium binding sites in the adsorbent. Moreover, PAO/PMPC-SH exhibits exceptional antibacterial activity. After 28 days of test in natural seawater, PAO/PMPC-SH demonstrates a high uranium extraction capacity of 6.26 mg g −1 , representing only a 9.14 % decrease compared with the capacity of adsorbing in marine microorganism-removed natural seawater. Overall, the notable performance of PAO/PMPC-SH in uranium extraction highlights its potential as a highly effective adsorbent for uranium extraction from seawater.
研究领域:
材料科学
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环境科学
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核能工程
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产品关联
DOI
高影响因子
E-POLYMERS
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2022
·Vol. 22
·期 1
·399-410
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IF 3.074
Jiawen Wang,Ye Sun,Xuemei Zhao,Lin Chen,Shuyi Peng,Chunxin Ma,Gaigai Duan,Zhenzhong Liu,Hui Wang,Yihui Yuan,Ning Wang
Although metal–organic frameworks (MOFs) own excellent uranium adsorption capacity but are still difficult to conveniently extract uranium from seawater due to the discrete powder state. In this study, a new MOF-based macroporous membrane has been explored, which can high-efficiently extract uranium through continuously filtering seawater. Through modifying the UiO-66 with poly(amidoxime) (PAO), it can disperse well in a N,N -dimethylformamide solution of graphene oxide and cotton fibers. Then, the as-prepared super-hydrophilic MOF-based macroporous membrane can be fabricated after simple suction filtration. Compared with nonmodified MOFs, this UiO-66@PAO can be dispersed uniformly in the membrane because it can stabilize well in the solution, which have largely enhanced uranium adsorbing capacity owing to the modified PAO. Last but not least, different from powder MOFs, this UiO-66@PAO membrane provides the convenient and continuously uranium adsorbing process. As a consequence, the uranium extraction capacity of this membrane can reach 579 mg·g −1 in 32 ppm U-added simulated seawater for only 24 h. Most importantly, this UiO-66@PAO membrane (100 mg) can remove 80.6% uranyl ions from 5 L seawater after 50 filtering cycles. This study provides a universal method to design and fabricate a new MOF-based adsorbent for high-efficient uranium recovery from seawater.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Luyan Li,Hao Li,Mingzhang Lin,Jun Wen,Sheng Hu
The amidoxime group has received widespread attention owing to its high affinity for uranium. Since this property was discovered, various amidoxime-based adsorbents have been developed for uranium adsorption. However, the effect of chain conformation on the uranium adsorption performance (in terms of adsorption capacity, stability, selectivity, etc.) of amidoxime adsorbents has rarely been studied. Herein, three amidoxime-based adsorbents with different chain conformations (linear, multi-armed, and rigid) were constructed via tert -butyl hydroperoxide-initiated surface graft polymerization by incorporating different monomer structures. Adsorption experiments revealed that the linear structure of P-E-PAO exhibited the highest adsorption capacity owing to the highest monomer-grafting ratio; the multi-arm structure of P-E-PMGO was affected by pH and ionic strength because of the most cyclic imide dioxime structure; and the rigid structure of P-E-PEBO showed the highest selectivity owing to the most open-chain amidoxime structure. These findings are expected to have strong implications in the optimization of adsorption material designs.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Tingting Deng,Lina Lv,Xiaoyu Li,Jun Wen,Hao Li,Hao Peng,He Chen,Chang Liu,Lianggui Bao,Caiping Dang,Yihao You,Fangting Chi
Uranium extraction from seawater plays a key role in redefining the declining uranium reserves to afford sustainable nuclear power. However, it is an urgent need to develop adsorbents simultaneously possessing enhanced efficiency, collect ability, salt resistance, antibacterial properties and economy to massively extract uranium from seawater. Herein, aminomethanesulfonic acid grafted polyamidoxime fibers (PAO-AMS-A) with hydrophilicity, salt resistance and antibacterial properties were prepared. The resulting fibers display high salt resistance and high uranium uptake capacity, providing the fibers a very high adsorption efficiency of 554.09 mg g −1 in pure uranium solution, 205.43 mg g −1 and 473.44 mg g −1 in 8 ppm and 20 ppm uranium spiked seawater and 10.04 mg g −1 in real seawater, respectively. Furthermore, the material exhibited good salt tolerance, and the uranium adsorption capacity was still as high as 597.97 mg g −1 in high concentrations of NaCl solution. Note that PAO-AMS-A has also good antibacterial activity, the antibacterial rate against bacteriais cultured in seawater is up to 93.49 %. Overall, PAO-AMS-A fibers are promising in industrial uranium extraction from seawater due to their high adsorption efficiency, salt resistance and antimicrobial properties.
研究领域:
材料科学
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环境科学
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核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Fan Wu,Abdul Haleem,Mohib Ullah,Li Chen,Hao Li,Jianming Pan
Recovering precious metals such as palladium from secondary resources faces significant challenges, including the scarcity of efficient adsorbents capable of withstanding harsh acidic conditions and needing materials with high selectivity, mechanical stability, and scalability. In response to these challenges, we developed highly porous cryogels functionalized with sulfonic and amidoxime groups, achieving a unique combination of hydrophilicity, flexibility, and selectivity for Pd(II) ions. Using a redox cryopolymerization method, these cryogels attained a gel fraction of 100 % and a maximum adsorption capacity of 425.3 mg g −1 at 318 K, as the Langmuir isotherm model fitted. This work also combined 3D printing technology with cryopolymerization to create a highly selective, high mechanical strength and customizable shape adsorption material, overcoming traditional adsorption materials' limitations in acid conditions. This innovative combination fills the gap in selective palladium recovery in customizable super macroporous materials, offering a sustainable solution for precious metal recovery and setting a foundation for broader applications in adsorption separation.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Jiashuai Yan,Ye Li,Haorui Li,Yuzhi Zhou,Huafeng Xiao,Bolin Li,Xiao Ma
In this study, Zeolite X was prepared by hydrothermal method , and the amidoxime group was loaded on the zeolite X to prepare amidoxime-modified zeolite X. The effective removal of ruthenium by amidoxime-modified zeolite X in simulated wastewater was investigated. The raw and modified zeolite X were characterized systematically using the BET method, the SEM, the FTIR, the XRD and the XPS to understand the physicochemical changes of the materials, and its sensitivity to Ru 3+ adsorption. Batch adsorption experiments were carried out to investigate the effects of adsorbent dose, contact time, solution pH, different initial Ru 3+ concentrations, temperature and the effect of competitive ions on Ru 3+ adsorption. The modified zeolite X exhibited fast removal performance reaching equilibrium within 30 min at the pH of 3, and the maximum adsorption capacity was found to be 175.4 mg/g. The XRD patterns demonstrated that the modified adsorbent still has the characteristic peak of zeolite NaX, and from the SEM, it can be seen that the modified adsorbent shown the same regular octahedral crystal structure as the zeolite X. In addition, the characterization result of FTIR and XPS indicated the amidoxime group was successfully loaded onto zeolite X. Kinetic parameters were fitted by the pseudo-second order model (R 2 = 0.9999), and the adsorption process by the modified zeolite X was chemical adsorption. The adsorption isotherms data of modified zeolite X were well-fitted to the Langmuir (R 2 = 0.9834).In the competitive ions effect, the modified zeolite X effectively captured the Ru 3+ ion in the presence of Na + and K + . Therefore, the amidoxime-modified zeolite X could be effectively used as a potential adsorbent for Ru 3+ adsorption from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2020
·Vol. 327
·期 1
·39-47
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IF 1.137
Liu Peng,Yu Qiang,Zhang Xu,Chen Jiaqi,Xue Yun,Ma Fuqiu
Amidoxime (AO) based adsorbents have been proposed as low cost and efficient adsorbent for U(VI). Herein, we present a simple strategy for preparing AO modified artificial zeolite. The composition and morphology of the materials have been confirmed via XRD, FT-IR, TGA and SEM. The AO-artificial zeolite was synthesised as an efficient adsorbent for adsorbing U(VI). The critical factors affecting U(VI) adsorption from aqueous solution were exploited, such as pH, contact time, temperature and adsorbent dosage. This study reveals AO-artificial zeolite, along with a low-cost, environmentally friendly and facile synthesis, can be regarded as a promising material for uranium-containing wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
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IF 5.909
Zhixiao Liu,Zaixu An,Zhiming Mi,Zihan Wang,Qian Zhu,Dexing Zhang,Junman Wang,Jing Liu,Jialiang Zhang
Water pollution and scarcity have become a huge challenge to society. Hence, it is urgent to develop nanofiltration (NF) membranes with high permeance and high rejection for efficient desalination and wastewater treatment . Herein, novel NF membranes with poly (amidoxime) (PAO) as organic interlayer were prepared by the method of first coating and then interfacial polymerization (IP). The obtained NF membranes showed the regular nano-strips Turing structure and the polyamide (PA) layer thickness was as thin as 18.2 nm, which was probably attributed that the amidoxime groups significantly enhanced the surface hydrophilicity of poly (ether sulfone) (PES) support, and PAO as organic interlayer can bind with piperazine (PIP) through hydrogen bonding and Lewis acid-base interaction to reduce the diffusion rate of PIP, resulting in the unstable oil-water interface during IP reaction. As a result, the corresponding NF membrane exhibited the permeance up to 25.2 L/m 2 h bar with a rejection above 99% for Na 2 SO 4 , yielding an overall desalination performance superior to traditional NF membrane and most of NF membranes with inorganic nanomaterials as interlayer. Our work provides a simple avenue to fabricate advanced thin-film composite NF membranes with outstanding separation performance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）