CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Wanjun Mu,Qianghong Yu,Xingliang Li,Hongyuan Wei,Yuan Jian
Efficient, irreversible capture of radioactive strontium and cesium from aqueous media remains a serious task for nuclear waste disposal and environmental protection. To address this task, an effective sorbent based on magnetic composites coated with the synthetic porous exchanger WO 3 was prepared by a facile method and characterized in detail. XRD analysis indicated that the WO 3 coating did not change the phase of the Fe 3 O 4 core, and TEM imaging further showed that Fe 3 O 4 @WO 3 particles were successfully obtained with nearly uniform size. A batch of experiments was carried out to investigate the efficiency of Fe 3 O 4 @WO 3 in removing Sr 2+ and Cs + under various environmental conditions. Experimental results showed that Fe 3 O 4 @WO 3 has higher adsorption capacity for Sr 2+ and Cs + in acidic aqueous solution in comparison to the previous literature. The theoretical maximum adsorption capacities of Fe 3 O 4 @WO 3 for Sr 2+ and Cs + are 44.178 and 53.175 mg g −1 , respectively, as modeled by Langmuir isotherms. The adsorption process is fast and reaches equilibrium within 3 h, which is attributed to the good dispersion of WO 3 on the surface of Fe 3 O 4 and provided much more adsorption sites. Other than Ca 2+ and K + , coexisting electrolyte ions had no significant competition effects on the removal of Sr 2+ and Cs + by Fe 3 O 4 @WO 3 . In addition, the Fe 3 O 4 @WO 3 adsorbent remains stable in acidic solutions and may be repeatedly used 5 times without any noticeable loss in adsorption capacity; the used adsorbents can be easily separated from the aqueous solution using a magnetic method. The advantages of being nontoxic, highly stable, and resistant to acid, as well as having high adsorption capacity for Sr 2+ and Cs + , indicate that Fe 3 O 4 @WO 3 has significant potential for real radioactive wastewater treatment.
研究领域:
化学工程
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环境科学
·
核能技术
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yaorui Li,Adede Ochieng Simon,Caishan Jiao,Meng Zhang,Wenfu Yan,Heng Rao,Jiancong Liu,Jianan Zhang
In this study, a new and efficient sorbent material was developed by the surface modification of zeolite Y with surfactant of cetyltrimethyl ammonium bromide (CTAB) and amino acid of l -aspartic acid (Asp) for rapid removal of Sr 2+ , Cs + and UO 2 2+ in solution. The as-synthesized and modified zeolite Y were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and nitrogen adsorption-desorption analysis. The results showed that after first grafting the cations of CTAB on the external surface of zeolite Y crystals, negatively charged Asp was then successfully introduced onto zeolite to form the CTAB + Asp dually modified zeolite Y sorbent . The fraction of CTAB and Asp in dually modified zeolite Y is 9.6 wt % and 16.3 wt %, respectively. The sorption isotherm of UO 2 2+ , Sr 2+ and Cs + by such sorbent was better fitted by Langmuir model. The CTAB + Asp dually modified zeolite Y took 20 min to reach the maximum sorption amount, while the unmodified zeolite Y took 240 min. This encouraging result provides a new concept to design sorbent materials for rapid removal of radionuclides from contaminated water system in an emergency.
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International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 11
·2236-2244
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IF 4.8
Liu Hongyuan,Wu Jialei,Wang Siqi,Duan Jing,Shao Huiping
Porous magnesium strontium phosphate (Sr 3− x Mg x (PO 4 ) 2 ) ( x = 2, 2.5, 3) composite scaffolds were successfully prepared by three dimension gel-printing (3DGP) method in this study. The results show that Sr 0.5 Mg 2.5 (PO 4 ) 2 scaffolds had good compressive strength, and Sr 1.0 Mg 2.0 (PO 4 ) 2 scaffolds had good degradation rate in vitro. The weight loss rate of Sr 1.0 Mg 2.0 (PO 4 ) 2 scaffolds soaked in simulated body fluid (SBF) or 6 weeks was 6.96%, and pH value varied between 7.50 and 8.61, which was within the acceptable range of human body. Preliminary biological experiment shows that MC3T3-E1 cells had good adhesion and proliferation on the surface of Sr 3− x Mg x (PO 4 ) 2 scaffolds. Compared with pure Mg 3 (PO 4 ) 2 scaffolds, strontium doped scaffolds had excellent comprehensive properties, which explain that Sr 3− x Mg x (PO 4 ) 2 composite scaffolds can be used for bone tissue engineering.
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Materials
·
2024
·Vol. 17
·期 11
·2706
·
IF 3.1
Yingzhe Du,Lili Li,Yukun Yuan,Yufaning Yin,Genggeng Dai,Yaqing Ren,Shiying Li,Peng Lin
Throughout the nuclear power production process, the disposal of radioactive waste has consistently raised concerns about environmental safety. When the metal tanks used for waste disposal are corroded, radionuclides seep into the groundwater environment and eventually into the biosphere, causing significant damage to the environment. Hence, investigating the adsorption behavior of radionuclides on the corrosion products of metal tanks used for waste disposal is an essential component of safety and evaluation protocols at disposal sites. In order to understand the adsorption behavior of important radionuclides60Co,59Ni,90Sr,135Cs and129I on α-FeOOH, the influences of different pH values, contact time, temperature and ion concentration on the adsorption rate were studied. The adsorption mechanism was also discussed. It was revealed that the adsorption of key nuclides onto α-FeOOH is significantly influenced by both pH and temperature. This change in surface charge corresponds to alterations in the morphology of nuclide ions within the system, subsequently impacting the adsorption efficiency. Sodium ions (Na+) and chlorate ions (ClO3−) compete for coordination with nuclide ions, thereby exerting an additional influence on the adsorption process. The XPS analysis results demonstrate the formation of an internal coordination bond (Ni–O bond) between Ni2+and iron oxide, which is adsorbed onto α-FeOOH.
研究领域:
环境科学
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核能工程
·
化学
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DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 11
·7825-7835
·
IF 3.9
Sheng Chen,Lina Wu,Zhicheng Wu,Zhikun Liu,Zhihua Qiu,Lisheng Chi
With the development of nuclear power, efficiently treating nuclear wastes generated during operation has attracted extensive attention. Hydrogels are common adsorbent materials in the treatment of wastewater due to their high swelling rate and easy post-treatment. In this work, a novel polyacrylic acid/crown-ether/graphene oxide (PAA/DB18C6/GO) hydrogel composite was synthesized by a radical cross-linking copolymerization method and characterized using various analytical tools such as SEM, FT-IR, TGA and XPS. The effects of time, pH, initial Sr2+ concentration, and temperature on Sr2+ adsorption onto the PAA/DB18C6/GO were studied. The PAA/DB18C6/GO shows a high adsorption capacity of 379.35 mg g−1 at an initial Sr2+ concentration of 772 mg L−1 due to the unique structure of dibenzo-18-crown-ether-6 and high swelling. The composite has a high selectivity for Sr2+ with a removal rate of 82.4% when concentrations of Na+ and K+ were 10 times higher than that of Sr2+. The pH and temperature have no apparent impact on adsorption performance of the PAA/DB18C6/GO under the experimental conditions. The composite shows excellent reusability with more than 92% removal rate for Sr2+ after five continuous cycles. In addition, the mechanism of Sr2+ adsorption by PAA/DB18C6/GO was analyzed by fitting the adsorption data to the theoretical models and XPS data.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yutong Wang,Mengxin Chen,Enrui Zhang,Sichen Liu,Hang Zhao,Gopika M. Gopakumar,Ruttiya Chaepratoom,Suwit Suthirakun,Anurak Weahayee,Wanwisa Limphirat,Theeranun Siritanon,M.A. Subramanian,Peng Jiang
The emission peak of Mn 5+ lies in the second near-infrared window (NIR-II) biological transparency window, and it exhibits outstanding application prospects in deep-tissue bioimaging, non-contact optical thermometry, and related fields. In this work, a novel Mn 5+ -activated Ba 1.9 Sr 0.1 TiO 4 NIR-II phosphor is designed and synthesized via a high-temperature solid-state reaction, where partial Sr 2+ substitution for Ba 2+ enables precise crystal field modulation around Mn 5+ ions. Mn K-edge X-ray absorption near-edge structure (XANES) spectroscopy confirms that Mn ions are stabilized in the +5 oxidation state. The optimized BSTO: 0.1 % Mn 5+ phosphor shows efficient 680 nm red light excitation and a characteristic narrowband NIR-II emission at 1190 nm from the 1 E → 3 A 2 transition of Mn 5+ , with a long luminescence lifetime of 184.9 μs and excellent thermal stability. Density functional theory with Hubbard U correction (DFT + U) calculations further reveal that Sr 2+ substitution induces controllable lattice contraction and local structural distortion, which modulates the host electronic structure and enhances the stability of Mn 5+ luminescent centers. Furthermore, the phosphor delivers a maximum relative temperature sensitivity of 2.24 % K −1 via the luminescence intensity ratio technique. A proof-of-concept NIR phosphor-converted light-emitting diode fabricated with the as-prepared phosphor realizes clear NIR penetration imaging.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yi Ding,Dandan Liu,Dengyu Luo,Xiaoyun Sun,Jinfeng Mei,Shaomang Wang,Zhongyu Li
A novel crosslinker, iminodiacetic acid (IA), was used to fabricate a three-dimensional carboxymethyl chitosan (CMC) hydrogel. The gel was synthesized using a simple one-step method within a short reaction time of 2 min. IA also plays the role of adsorption site provider. Fourier transform infrared spectroscopy (FT-IR) and X-Ray Diffraction (XRD) demonstrated the crosslinking reaction. The swelling ratio and the surface morphology can be modulated by changing the CMC:IA ratio, resulting from the changes on the degree of cross-linking and the number of functional groups, which in turn greatly affect the adsorption capacity for Sr 2+ . The maximum adsorption capacity can reach 144.73 mg/g, depending on the pH value. XPS spectra indicate that the adsorption derives from the ion exchange of Na + to Sr 2+ , mainly interacting with the carboxyl radicals on CMC as well as IA. In addition, the gel shows high mechanical strength , which is helpful to the application and recycle in wastewater treatment . The facile and fast synthesis, high adsorption capacity and strong mechanical strength prove that the gel is a promising material for radioactive wastewater treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Taotao Lu,Yongfeng Zhu,Yanxing Qi,Yuru Kang,Aiqin Wang
Until recently, high organic phase volume and the addition of a large amount of surfactants have been two major disadvantages of conventional high internal phase emulsions (HIPEs) templates in the construction of porous adsorbents. Herein, a facile and novel tunable superporous magnetic adsorbent (MSPA) was synthesized by the polymerization of the green surfactant-free (soybean oil)-in-water Pickering medium internal phase emulsion (O/W Pickering MIPEs), which was stabilized synergically by the magnetic yeast (MY) and chitosan (CTS). It is interesting that the extremely stable surfactant-free Pickering-MIPEs can be obtained through the fine synergistic effect between MY and CTS at the oil-water interface, and the pore structure of the magnetic adsorbent can be easily adjusted by changing the ratio of MY to CTS, as well as the external pH. The obtained MSPA with abundant COO − and NH 2 functional groups had a fast capture rate and high adsorption capacities for radioactive Rb + and Sr 2+ ions, respectively. The saturation adsorption capacities of 168.98 and 151.91 mg/g for Rb + and Sr 2+ can be achieved within 25 or 10 min, respectively. Moreover, the MSPA had excellent regeneration ability and reusability. This work provided a feasible and environmentally friendly pathway for preparation of the superporous magnetic adsorbent with tunable porous structure for adsorption and separation application.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 20
·5979-5985
·
IF 7
Xiaoguang Du,Fangyan Wang,Fei Liang,Zhanggui Hu,Yicheng Wu,Xinyuan Zhang
Nonlinear optical (NLO) crystals are the core components of high-performance coherent sources. Their properties can be modulated and improved by molecular design of constituent functional motifs. In this study, inspired by a classical π-conjugated borate group (B3O6)3−, we discovered a π-conjugated isocyamelurate [H2C6N7O3]− anion with colossal π-conjugated orbitals, thus giving ultra-strong anisotropic first-order polarizability and ultralarge second-order susceptibility. Two new alkaline-earth metal isocyamelurates, namely, Ca0.5H2C6N7O3·4H2O (I) and Sr0.5H2C6N7O3·4H2O (II), were successfully synthesized by a facile aqueous solution method. Both I and II show excellent nonlinear optical properties, including wide band gap (>4.05 eV), large birefringence (Δn ∼ 0.24), and a strong second order harmonic generation response (>5 × KDP). Moreover, I and II exhibit a broadband ultraviolet photoluminescence around 400 nm, which indicate that they are potential multifunctional optical materials with photon-emission and photon-conversion properties. The first-principles calculations reveal that the (H2C6N7O3)− anionic group plays a dominant role in optimizing and enhancing the optical performance of the crystals. This study confirms that there are plenty of opportunities for (iso)-cyamelurates in designing functional crystals with superior properties.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
X. Zhou,M.-H. Zhao,J. Yang,Y. Han,L. Cao,Y.-Y. Han,J. Wang,Y. Wang,M.-R. Li
Environment-friendly and cost-effective versatile yellow-green inorganic pigments are technically significant for natural camouflage but rare. Here, we adopt site-selective parent-doping of Mn–Li into the octahedral Ca-site (Ca B ) of Ca 3 TeO 6 to deliver vivid greenish pigments by the unprecedented yellow-green Mn 4+ O 6 chromophore, yielding tunable pigments resemble to seasonal leaves. The camouflage color zone of these pigments are remarkably enlarged by chemical pressure via Mg 2+ /Sr 2+ -substitution for the A -site Ca (Ca A ). The locally anisotropic and positive chemical pressure on chromophore group is scaled to be around +14.4/+23.3 GPa, as estimated from the accompanied geometric evolution of Mn 4+ O 6 . The achieved pigments also demonstrate excellent chemical and thermodynamic stability and high (60–80%) near infrared reflectivity in 1500–2500 nm, showing potential applications for natural camouflage and yellow-green “cool pigments”. These findings built a bridge between chemical and equivalently physical pressure, and nominated a way to estimate the overall and local strain/pressure by optical descriptor.
研究领域:
无机化学
·
材料科学
·
光学
·
环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Xuewei Ba,Xinyu Han,Wenping Huang,Yuhong Ge,Qiran Wen,Yan Yu,Deqing Zhang,Li Li
Sr 2 (Y, La)NbO 6 :Dy blue-white phosphors were prepared by high-temperature solid-state method. The effects of substitution on the crystal structure, photoluminescence properties, and thermal stability were investigated by XRD, SEM, EDS, XPS, diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Phase analysis indicates that the crystal structure of the host materials is not altered by the introduction of Dy 3+ ion, but transfers from monoclinic to cubic system by substituting Y 3+ ions with La 3+ ions. Morphological analysis reveals that the phosphors exhibit irregular shapes with the particle diameters ranging from 10 μm to 20 μm. The blue shift appears in the charge transfer band with the increase of La 3+ ion dosage. Sr 2 (Y, La)NbO 6 :Dy phosphors can be excited by near-ultraviolet and blue light. The emission spectra exhibit two characteristic peaks at 488 nm and 580 nm, corresponding to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 optical transitions of Dy 3+ ions, respectively. The emission intensity and the fluorescence lifetime are enhanced by the replacement of Y 3+ ions with La 3+ ions. The Sr 2 LaNbO 6 :Dy phosphor possesses excellent thermal stability. The luminescent intensity at 423 K retains 83% of the value at room temperature. The result indicates that Sr 2 (Y, La)NbO 6 :Dy phosphors have good prospects in solid state lighting.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Xuan Ma,Xudong Zheng,Xiang Gu,Xinmiao Pan,Lin Guo,Jingbo Sun,Youming Zhu,Jinfeng Mei,Jian Rong,Zhongyu Li
Selective removal of 90 Sr from highly acidic nuclear wastewater remains challenging due to strong H + competition and poor adsorbent stability. Here, we report a Sr 2+ -imprinted chitosan aerogel (IIP-CE-CS) with pseudo-crown ether recognition cavities, synthesized via ion-imprinting combined with low-temperature thermally induced phase separation. The material exhibits a high specific surface area (142.5 m 2 g −1 ) and a hierarchical porous structure (pore volume 0.90 cm 3 g −1 ). At pH = 1.0, IIP-CE-CS achieves a Sr 2+ adsorption capacity of 142.6 mg g −1 , fast pseudo-second-order kinetics, and excellent selectivity over competing ions (α(Sr/pb) = 2.74). The imprinted cavities retain their configuration after acid elution, resulting in 82% capacity retention over five adsorption–desorption cycles. Mechanistic studies confirm that Sr 2+ capture occurs via specific coordination with ether‑oxygen atoms within the imprinted cavities, while protonated amino groups stabilize the aerogel structure under acidic conditions. This work provides a regenerable and highly selective adsorbent for Sr 2+ separation from acidic solutions
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