Journal of Environmental Sciences
·
2020
·
IF 4.302
Shengbo Li,Lijia Dong,Zuofu Wei,Guodong Sheng,Kui Du,Baowei Hu
Herein, we developed the invasive plant-derived biochar (IPB) functionalized with CaAl-LDH at five mass ratios using a physical mixture method, assessed their adsorption perform for Eu(III), and explored the relative mechanisms. Results show that the IPB successfully loaded CaAl-LDH in five composites and their Eu(III) sorption affinities were strongly affected by solution pH, contact time, temperature, and the mass ratio of LDH and IPB. All the sorpiton process for Eu(III) occurred on the heterogeneous surface of five composites and the boundary layer diffusion limited the chemical sorption rate. Interestingly, the CaAl-LDH/IPB composite with high ratio of IPB had higher sorption capacity than the one with high ratio of LDH due to larger porosity of the former. Three mechanisms containing ion exchange between Al and Eu ions, surface complexation with carboxyl- and oxygen-containing functional groups, and precipitation were involved in the Eu(III) sorption, but the dominant sorption mechanism for each CaAl-LDH/IPB composite differed with different mass ratio of CaAl-LDH and IPB. In composite with more IPB (e.g., CaAl-LDH/IPB-13), both ion exchange and surface complexes dominated the sorption process and the intensity of Eu 3+ was identified with the one of Eu 2 O 3. Whereas in composites with high LDH, ion exchange dominated the sorption and the intensity of Eu 3+ was obviously higher than the one of Eu 2 O 3 . This research will provide a new perspective for the application of the LDH/biochar materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Lijia Dong,Shengbo Li,Yefei Jin,Baowei Hu,Guodong Sheng
In this paper, CaAl hydrotalcite or hydroxyapatite decorated invasive plant ( Solidago canadensis )-derived biochar were synthesized by co-precipitation and high temperature pyrolysis method. The three composites and bare biochar were characterized by Scanning electron microscopy (SEM), X-ray spectroscopy (EDX), the Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS) techniques, and employed to remove Eu(III) from wastewater under a series of environmental conditions. The results indicated that the Eu(III) adsorption on BC@LDH@HAP was higher than that on BC, BC@LDH, and BC@HAP, and belonged to multi-layer adsorption, which was different from the monolayer adsorption of biochar. The adsorption could be fitted best by Langmuir model and the maximum adsorption capacity of Eu(III) on BC@LDH@HAP was up to 714 mg/g at pH ~ 6. The characterization results suggested that this excellent adsorption of BC@LDH@HAP arose from the abundant P-, C-, O-containing functional groups rather than larger specific surface area. The spectra of XPS, FT-IR, and XRD uncovered that the adsorption mechanisms of Eu(III) on BC@LDH@HAP involved surface complexation, ion exchange, and precipitation. Moreover, the absorbed Eu(III) was formed into two precipitate induced by P-containing groups and carbonate groups. This research confirmed BC@LDH@HAP is a promising material for the removal of Eu(III) in wastewater.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuemei Wei,Xiankui Cheng,Xinyu Zhang,Guodong Sheng,Huiting Xu
The utilization of biocompatible and inexpensive adsorbents for the effective scavenging of U(VI) and Eu(III) from wastewater is still an open challenge in nuclear waste management. Herein, three kinds of α-Fe 2 O 3 nanocrystals with different morphologies, i.e., α-Fe 2 O 3 nanospheres (HNSs), nanoplates (HNPs) and nanorods (HNRs), which were exposed (1 0 2), (0 0 1), and (1 1 0) facet, respectively, was used to scavenge U(VI) and Eu(III) from aqueous solutions via an adsorption procedure. Various techniques of N 2 adsorption–desorption, FT-IR, XRD, XPS, TEM, SEM and EDS were applied to characterize these adsorbents before or after adsorption. The results indicated that the adsorption capacity of U(VI) and Eu(III) was in the order of HNPs (0 0 1) > HNRs (1 1 0) > HNSs (1 0 2), namely, α-Fe 2 O 3 nanoplates was proved to be a good adsorbents, with removal capacity of 221 mg/g and 131 mg/g for U(VI) and Eu(III) scavenged on HNPs, respectively. The kinetics of U(VI) and Eu(III) scavenging agreed with the pseudo second order kinetic model, suggesting that chemical interaction is mainly responsible for U(VI) and Eu(III) scavenging on these materials. Furthermore, the Freundlich model fit the best for adsorption isotherms of U(VI) and Eu(III). The present study demonstrated that these α-Fe 2 O 3 nanocrystals are promising materials in nuclear waste management.
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TALANTA
·
2025
·
IF 6.1
Shuyun Zhu,Kunming Sun,Shuyi Liu,Qian Wang,Jiatong Fan,Xian-En Zhao,Guobao Xu
Flavonoid glycosides are formed by dehydration condensation of aglycones and sugar molecules. Therefore, discrimination of flavonoid glycosides from their corresponding aglycones is a challenging task because they contain the same aglycone part in their molecular structures. Herein, boric acid-functional Eu(III)-organic framework (BA-Eu-MOF) was applied to discriminate flavonoid glycosides including baicalin (Bai), wogonoside (Wog), rutin (Rut), puerarin (Pue), quercitrin (Que) and astragalin (Ast) from their corresponding aglycones for the first time. Besides as organic ligand to sensitize the luminescence of Eu 3+ through “antenna” effect, 5-boronobenzene-1,3 dicarboxylic acid provided recognition site for flavonoid glycosides. Infrared, fluorescence, UV–vis, and mass spectra were used to investigate the recognition reaction between BA-Eu-MOF and flavonoid glycosides. The data indicated that the cis -diols of flavonoid glycosides from sugars covalently bonded to boric acid group to form cyclic boronic esters, which quenched the fluorescence of BA-Eu-MOF at 620 nm through decreasing the intersystem efficiency, inner filter effect and photoelectron transfer. In contrast, aglycones could not alter the fluorescence of BA-Eu-MOF because of no covalent bond between them. This probe exhibited high sensitivity towards flavonoid glycosides with the low detection limits of 3.3 nM, 3.5 nM, 33 nM, 56 nM, 5.1 nM and 5.5 nM for Bai, Que, Wog, Ast, Pue and Rut, respectively. The unique recognition ability of boric acid group enables selective and sensitive detection of flavonoid glycosides without the interference of their corresponding aglycones.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2020
·Vol. 22
·期 39
·22746-22757
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IF 3.43
Wenting Wei,Jiaxuan Li,Huiqin Yao,Keren Shi,Hongyun Liu
Herein, a new type of lanthanide coordination polymer film made up of europium (Eu(III)) and poly(N-methacryloylglycine) (Eu(III)–PMAG) was prepared on an ITO electrode surface driven by the coordination between N-methacryloylglycine (MAG) and Eu(III) through a single-step polymerization process. The fluorescence signal of Eu(III)–PMAG films at 617 nm originating from Eu(III) could be well retained in the buffer solution but was regulated by the concentration of Cu(II) and the complexing agent EDTA. The switching of fluorescence by Cu(II) was attributed to the inhibition of the “antenna effect” between Eu(III) and the MAG ligand in the films. The coexistence of reduced β-nicotinamide adenine dinucleotide (NADH) in the solution can apparently quench the fluorescence of Eu(III)–PMAG films through the internal filtration effect of UV absorbance overlapping the excitation wavelength, but itself exhibiting a fluorescence emission at 468 nm. In addition, the electrocatalytic oxidation of NADH with the help of the ferrocenedicarboxylic acid (FcDA) probe demonstrated a cyclic voltammetry (CV) signal at 0.45 V (vs. SCE). Based on various reversible stimulus-responsive behaviours, a 4-input/10-output logic network was built using Cu(II), EDTA, NADH and FcDA as inputs and the signals of fluorescence from Eu(III)–PMAG (617 nm) and NADH (468 nm), the CV response from FcDA and the UV-vis absorbance from the Cu(II)–EDTA complex as outputs. Meanwhile, 6 different functional logic devices were constructed based on the same versatile platform, including a 2-to-1 encoder, a 1-to-2 decoder, a 1-to-2 demultiplexer, a parity checker, a transfer gate and a reprogrammable 3-input/2-output keypad lock. Combined with the new type of lanthanide coordination polymer film, NADH played central roles in designing sophisticated computing systems with its fluorescence, UV and electrocatalytic properties. This work might provide a novel avenue to develop intelligent multi-analyte sensing and information processing at the molecular level based on one single platform.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-11
·
IF 6.232
Guo Hao,Wu Ning,Xue Rui,Liu Hui,Wang Mingyue,Yao Wenqin,Wang Xiaoqiong,Yang Wu
An Eu(III)-functionalized strontium-organic framework (Eu 3+ @Sr-MOF) was synthesized by encapsulating Eu 3+ ions into the pores of Sr-MOF via postsynthetic modification (PSM) and fully characterized by XRD, SEM, EDS, FTIR, and TGA. The luminescent properties of Eu 3+ @Sr-MOF were measured and investigated in detail, which demonstrated that Eu 3+ @Sr-MOF not only possessed excellent water and chemical stabilities in a wide pH range (5–10) but also displayed red luminescence with excitation/emission maxima at 332/617 nm. The Eu 3+ @Sr-MOF can be considered as a highly selective and sensitive recyclable luminescence probe for sensing Cr(III) and Cr(VI) based on strong luminescence quenching effects; it can be recycled at least five times. The luminescence probe for Cr 3+ , CrO 4 2− , and Cr 2 O 7 2− shows low detection limits (0.15 μM, 0.17 μM, and 0.13 μM, respectively), relatively broad linear ranges (0.6–150 μM, 0.1–200 μM and 0.4–180 μM, respectively), and high quenching constants K SV . The signals can be observed by the naked eye under UV light of 365 nm. The method was applied to the determination of total Cr in environmental water samples.
Graphical abstract
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.7
Yi-Na Li,Xin Zhong,Yunlong Wu,Yun-Fang Huo,Ya-Li Liu,Jun Wang,Yang-Tian Yan
In this study, a new three-dimensional metal organic framework (MOF) named [Eu 2 (L) 3 (H 2 O) 2 ] n ( 1 ), act as the ultrasensitive fluorescence sensors for tetracycline and Fe 3+ in aqueous solution, have been successfully synthesized by using the 2-(1H-pyrazol-4-yl) terephthalic acid (H 2 L) and Eu(NO 3 ) 3 ·6H 2 O as the building units via the solvothermal synthesis procedure. Structure analysis reveal that 1 show a 3D molecular structure based on a binuclear secondary building units (SBUs). And also, the physical and chemical stability show that 1 show the good stability under the strong acid and alkali aqueous solution. The fluorescence properties explorations of 1 show that 1 exhibits the attractive fluorescence performances in detecting tetracycline (TC) and Fe 3+ ions with the LODs of 3.77361 × 10 −5 M for Fe 3+ and 1.21958 × 10 −6 M for TC, which is comparable and even exceed the publications. The sensing mechanism have also been seriously explored. And importantly, the recycling experiments reveal that 1 exhibited good recyclability in fluorescence recognition after multiple experiments, which may provide us with a potential optical material for fast and efficient detection of Fe 3+ ions and TC.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Rui Shi,Pengcheng Hao,Zhongzhi Wang,Juan Zhang,Bo Li,Leijun Shen,Xin Qiao
In this work, we prepared a Carbazole-Benzene-Tripyridine ligand with a d -π-A structure and synthesized its corresponding Eu (III) and Tb (III) complexes. The structures of the complexes were analyzed by single crystal X-ray diffraction. It was surprisingly that the fluorescence emission intensity of the Eu(III) complex increases significantly once the solvent was added, indicating that the fluorescence could be activated by the solvent. However, it was confirmed that in the solid state, the complex molecules in the lattice were orderly arranged and there was a π-π stacking effect. The π-π stacking caused strong intermolecular interactions leading to emission quenching. The addition of solvent broke the π-π stacking and enhanced the fluorescence of the Eu(III) complex. The color of the fluorescence emission of the Eu(III) complex depended on the kind of added solvent. The results of nuclear magnetic resonance (NMR) and density functional theory (DFT) calculations suggested that the rotation of the C C single bond in the d -π-A structure ligand in different solvents caused a change in the spatial angle between the carbazole-benzene unit and the tripolypyridine unit in the ligand, thereby changing the excited state energy of the ligand. Hence, the varied emission colors of the complex reflect differences in the energy transfer efficiency of the ligand to rare earth ion. The solvent effect of the Eu(III) complex was then successfully applied in the rapid identification of specific alcohols.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xin Zhong,Wen Liang,Zhipeng Lu,Baowei Hu
In this investigation, TpPa-1 were synthesized and exploited for radionuclides ions elimination. According to Langmuir model, at pH 6.5 and 298 K, the maximum adsorption quantity of TpPa-1 were 1194.07 mg(U(VI))/g and 1107.63 mg(Eu(III))/g, respectively. The superior adsorption performance could be attributed to: (i) a great quantity of heteroatom activated sites on the pore wall could conduct as cation receptors; (ii) the forming intramolecular C N … H … O hydrogen bonding in the network of TpPa-1, which was U(VI) and Eu(III) ions adsorption sites; (iii) hydrogen bonding could adjust the electron density of the complex and abate the total charge of radionuclides. The outcomes of this work suggest that TpPa-1 is a promising adsorbent, which is appropriate to enrichment and separation radionuclides from polluted wastewater.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-10
·
IF 5.705
Wang Yan,Bian Feng,Qin Xiaofei,Wang Qianqian
A visible-light driven photoelectrochemical (PEC) aptasensor is described that is capable of detecting chloramphenicol (CAP). It is based on the use of a TiO 2 based nanorod array (NRA) sensitized with Eu(III)-doped CdS quantum dots. The NRA absorbs visible-light and while strongly depressing the recombination of photogenerated charges, thereby improving photo-to-current conversion efficiency. The introduction of Eu(III) ions promotes the charge transformation and utilization, and this results in a further increase of photocurrent. The NRA was employed as the photoactive material for the fabrication of a PEC aptasensor. CAP-binding aptamers were immobilized on a fluorine-doped tin oxide (FTO) electrode that was modified with the NRA. The aptasensor was applied to the determination of CAP by monitoring the decrease in photocurrent (at a typical voltage of 0 V) that is caused by the formation of the aptamer-CAP complex. Under optimal conditions, the response is linear in the 1.0 pM to 3.0 nM CAP concentration range, with a detection limit of 0.36 pM (at S/ N = 3). The method was applied to the determination of CAP in spiked milk samples where it gave satisfactory results.
Schematic presentation of the fabrication of a visible-light driven photoelectrochemical aptasensor based on the use of a TiO 2 nanorod array sensitized with Eu(III)-doped CdS quantum dots. It was applied to the determination of chloramphenicol with good selectivity and high sensitivity. TiO 2 NRA: TiO 2 nanorod array; FTO: fluorine-doped tin oxide; CdS:Eu 3+ QDs: Eu(III)-doped CdS quantum dots; BSA: bovine serum albumin; CAP: chloramphenicol
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高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yan-Fang Feng,Bi-Liu Lan,Zi-Ling Li,Tao Deng,Bo Zhou,Yu-Ning Liang,Zhong Zhang
Lanthanide metal–organic frameworks (Ln-MOFs) show promise for ratiometric biosensors owing to their tunable photoluminescence and rich energy transfer processes among Ln 3+ , organic ligand and photosensitizer, yet face challenges in environmental stability and susceptibility of energy transfer to external stimuli. Herein, a ligand-locked post-synthetic metalation (PSMet) strategy, namely grafting Cu(acac) − units to the free bipyridine sites of 2,2′-bipyridine-5,5′-dicarboxylate (bpydc 2− ) linkers in Eubpydc, was applied to develop a water-stable and dual-emissive Eu-MOF sensor, Cu@Eubpydc. Due to the conformation locking of bipyridine moiety via chelating to Cu(acac) − , the MOF network rigidity is reinforced and water stability is improved. Meanwhile, this modification impedes the energy transfer from the organic linkers to Eu 3+ , boosting ligand-based fluorescent emission, which is more sensitive to external factors than Eu 3+ emission. The post-synthetic Cu@Eubpydc as a ratiometric fluorescence (RF) sensor exhibited a sensitive response to a narrow pH change between 3.1 and 4.0, as well as low detection limits of 80 nM, 107 nM, and 64 nM for common neurotransmitters aspartic acid, glutamic acid, and glutathione, respectively. The pH response mechanism involves the binding of H + to the N-donor of the unmetallized bpydc 2− ligand through hydrogen bonding. In contrast, neurotransmitters sensing relies on hydrogen bonding interaction, absorbance-caused enhancement, as well as acidity enhancement aroused by redox reaction. Additionally, Cu@Eubpydc was finally applied to neurotransmitters determination in serum samples, and its satisfactory recovery rate confirm its practical utility. This work uncovered that the ligand-locked PSMet strategy opens a new avenue for constructing Ln-MOFs with excellent water stability and RF sensing capabilities.
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高影响因子
JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.4
Chen Licong,Shi Rui,Han Yunfei,Wang Limei,Li Xingyun,Wang Zhongzhi
1-Hydroxypyrene (1-HP) is the final metabolite of polycyclic aromatic hydrocarbons in the human body, and Fe 3+ is an important trace element for human growth and metabolism. When 1-HP or Fe 3+ is detected in human urine, it indicates that there is a problem with the human health condition. The detection of 1-HP and Fe 3+ in urine can reflect the health status of the human body. In this work, Eu(III) complexes coated silane coupling agent (WD-53) modified spherical SiO 2 core-shell composite material (SiO 2 -WD-53@L-Eu) was prepared and used as the fluorescent probe for detecting 1-HP and Fe 3+ . The fluorescence intensity of SiO 2 -WD-53@L-Eu with the same mass concentration is 1.37 times that of L-Eu, while the content of Eu 3+ in SiO 2 -WD-53@L-Eu is only about one-third of L-Eu. Moreover, the dispersion stability of SiO 2 -WD-53@L-Eu in solvents is much higher than that of L-Eu. Furthermore, SiO 2 -WD-53@L-Eu exhibits the sensitive response to 1-HP and Fe 3+ without interference from inorganic salts, urea, glucose and other components. The fluorescence quenching constants for detecting 1-HP and Fe 3+ are 9.62 × 10 5 M − 1 and 5.29 × 10 3 M − 1 , respectively, and the limits of detection are 5.93 × 10 − 6 M and 1.08 × 10 − 3 M, respectively. We further employed the SiO 2 -WD-53@L-Eu composite material within a Tris-HCl buffer to detect 1-HP and Fe 3+ , respectively, and obtained Stern-Volmer quenching constants (K sv ) of 3.662 × 10 5 M − 1 and 1.957 × 10 3 M − 1 . Compared to L-Eu, composite material SiO 2 -WD-53@L-Eu has higher fluorescence efficiency, better dispersion stability and chemical stability. Therefore, SiO 2 -WD-53@L-Eu is considered a promising material for detecting 1-HP and Fe 3+ in urine.
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