SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Haiyan Luo,Haoyu Yao,Min Li,Fanfang Meng,Hui Zhao,Changjiang Yu,Xiangfeng Liang,Huizhou Liu
Efficient extraction of uranium from seawater is of great significance to the stable development of nuclear energy. The graft modification of pectin is expected to realize the efficient extraction of uranium through the dual action of aminoxime and carboxyl groups. In this work, novel biomimetic pectin adsorbents were developed and their performance on the adsorption performance of uranium from seawater was investigated. The physical structure and morphology were characterized by employing FT-IR, BET, SEM and elemental analysis. The skeleton structure and surface functional groups of the pectin-derived adsorbents, which were modified to improve the adsorption selectivity, favored the adsorption of uranium in simulated seawater. The modified apple pectin (MPA) adsorbents exhibited the highest adsorption capacity of 212.27 mg/g at optimal conditions. The thermodynamic results showed that the adsorption of uranium on MPA surface followed the Langmuir single-layer model, and the theoretical maximum adsorption capacity could reach up to 296.25 mg/g. The adsorption process conformed to the pseudo-second-order model. Furthermore, the synergistic mechanism between aminoxime and carboxyl groups of the pectin-based adsorbents was proposed. In conclusion, this work provides a new bio-based adsorbent with high efficiency for uranium extraction from concentrated seawater.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2023
·Vol. 55
·期 20
·3393-3401
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IF 2.6
Yue-Lu Zhu,Jie Yan,Xiu-Xuan Xu,Zong-Yu Sun,Jiao Chen
Copper-catalyzed coupling reaction involving N-phenoxyacetamides and 2H-azirines is described, in which N–O and C–N bonds are broken and restructured. This protocol provides an efficient strategy for the highly regioselective synthesis of racemic α-amino oxime ethers. In addition, this strategy can be used to modify natural products and is gram-scale compatible.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Hao Liang,Wei Tian,Nana Wang,Hongping Zhang,Ruijuan Wang,Ruibin Guo,Zunli Mo,Nijuan Liu
Uranium as a nuclear fuel, its source and aftertreatment has been a hot topic of debate for developers. In this paper, amidoxime and guanidino-modified cotton fibers (DC-AO-PHMG) were synthesized by the two-step functionalization approach, which exhibited remarkable antimicrobial and high uranium recovery property. Adsorption tests revealed that DC-AO-PHMG had excellent selectivity and anti-interference properties, the maximum adsorption capacity of 609.75 mg/g. More than 85 % adsorption capacity could still be kept after 10 adsorption-desorption cycles, and it conformed to the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model as a spontaneous heat-absorbing chemical monolayer process. FT-IR, EDS and XPS analyses speculated that the amidoxime and amino synergistically increased the uranium uptake. The inhibitory activities of DC-AO-PHMG against three aquatic bacteria, BEY , BEL (from Yellow River water and lake bottom silt, respectively) and B. subtilis were significantly stronger, and the uranium adsorption was not impacted by the high bacteria content. Most importantly, DC-AO-PHMG removed up to 94 % of uranium in simulated seawater and extracted up to 4.65 mg/g of uranium from Salt Lake water, which demonstrated its great potential in the field of uranium resource recovery.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TETRAHEDRON
·
2020
·
IF 2.233
Zhen-Hua Li,Xiao-Meng Sun,Jin-Jing Qin,Zhi-Yong Tan,Wen-Biao Wang,Yao Ma
An efficient and divergent synthesis of N -arylbenzimidazoles and N -arylindazoles from arylamino oximes based on reaction conditions selection was developed. The synthesis was approached by treating oximes with BTC and the chemoselectivity was regulated by the amount of Et 3 N. This switchable N–N and N–C bond formation process features mild reaction conditions, simple execution, high chemoselectivity and broad substrate scope.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 14
·7920-7927
·
IF 14.511
Weihua Zhang,Xiao Han,Jun You,Xiaofang Zhang,Danfeng Pei,Stefan Willför,Mingjie Li,Chunlin Xu,Chaoxu Li
The efficient extraction of the aquatic uranium element has drawn growing research interest because of its importance for both nuclear energy acquirement and water environmental remediation. Large-capacity, rapid filtration adsorption is promising, but remains challenging in capturing aquatic uranium ions. Herein, cyanoethyl substitution was found to enable the rapid exfoliation of cyanoethyl cellulose nanofibrils by mild shear (e.g., manual shake and homogenization) within 30 min with a conversion of up to ∼90% and unique re-dispersibility in many organic solvents. After hydrolyzing cyanoethyl into amidoxime, the resultant amidoximated cellulose nanofibrils, serving as a novel type of green absorbent, exhibited rapid kinetics (<5 min) and large reversible capacity (1327 mg g−1) in aquatic uranium adsorption. Their rigid fibrous feature and super dispersibility facilitated the construction of fibrous porous films to capture uranium ions in high capacity in continuous filtration flow. Therefore, this cyanoethyl exfoliation may not only provide an unprecedented route for the rapid and energy-efficient production of cellulose fibrils, but also promises a green and sustainable alternative for the high-efficiency extraction of aquatic uranium element.
研究领域:
材料科学
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环境工程
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核工程
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化学工程
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可持续化学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Ke Feng,Wenhao Ma,Feng Zhou,Chunying Si,Pengfei Zheng,Ping Sun,Quanxing Zhang,Min Zhan,Wei Jiang
Industrial production and human activities have resulted in significant oil pollution issues. The utilization of electrospinning nanofibrous membranes for the separation of oil-water mixtures and emulsions has been widely adopted. However, these membranes face challenges due to their low flux and membrane fouling . In this study, we conducted a chemical modification on a novel cross-electrospinning material, amidoximated polyacrylonitrile-regenerated cellulose acetate (AOPAN-RC), through deacetylation and ammoximation conversions. This modification led to the development of a superhydrophilic and antifouling composite membrane with excellent properties. The modified composite nanofibrous membranes exhibited remarkable hydrophilicity and strong underwater superoleophobicity, indicated by an underwater oil contact angle of 157.5° ± 1.24°, as well as a high water flux value exceeding 6000 LMH. The AOPAN-RC membranes demonstrated exceptional performance in separating highly emulsified surfactant-free and surfactant-stabilized oil-in-water emulsions, achieving separation efficiencies of over 94 ± 0.8 % and 90 ± 1.1 %, respectively. Furthermore, we discovered that higher water flux and improved emulsion separation efficiency can be achieved under low pH and ionic strength conditions with minimal addition of surfactants. Moreover, due to its superior antifouling property, the membrane enables long-term separation of high-viscosity oil-in-water emulsions and actual oily wastewater under various solution conditions. Notably, the flux of the AOPAN-RC membrane did not decrease significantly, making it significantly better than the PAN-CA and PAN-RC membranes. Additionally, the separation efficiency of the AOPAN-RC membrane also surpassed that of the other two. While the presence of surfactant-surrounded oil droplets may cause irreversible fouling over time, this innovative nanofibrous membrane exhibits great potential for practical applications in the treatment of a wider range of oil-contaminated wastewater sources.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ming-Bang Wu,Shi-Cheng Liu,Jin-Yan Fei,Hao Ye,Lu-Lin Ma
The effective treatment of uranium (U)-containing radioactive wastewater that from the mining process and nuclear leakage accidents is considered as the promise for the sustainable development of nuclear energy. Herein, amidoxime-functionalized microspheres with high grafting densities were prepared by the non-solvent induced phase separation and followed by surface chemical modifications while choosing celluloses as the raw materials in terms of broad resource, good hydrophilicity, and antimicrobial property. The excellent hydrophilicity of cellulose could reduce the rates of phase separation, leading to porous surface structures and spongy internal structures. In addition, the following swelling treatments would further modulate for higher pore sizes and porosities which could not only create more reaction sites during the modification but also promote the mass transfer as well as increase contact areas and retention times during the adsorption process. The obtained microspheres could selectively decontaminate more than 390 mg/g of uranium due to their abundant adsorption sites. In addition, their outstanding hydrophilicity endows them with good reusability and anti-fouling properties. The microspheres could also be put into filtration columns for long-term and dynamic adsorption which could be regarded as a decided advantage compared with common fiber-based adsorbents. The filtration columns could capture more than 17 mg/g after 20 days of uranium even with ultralow initial uranium concentrations and ultrahigh concentrations of other coexisting ions, demonstrating their desirable potentials in remediating radioactive wastewater.
研究领域:
环境科学
·
核工程
·
材料科学
·
化学工程
✓ 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）