Ion-Imprinted Mesoporous Silica for Selective Removal of Uranium from Highly Acidic and Radioactive Effluent

It is strategically important to recycle uranium from radioactive liquid wastes for future uranium supply of nuclear energy. However, it is still a challenge to adsorb uranium selectively from highly acidic and radioactive waste. In this paper, we report a novel strategy for effective uranium removal from highly acidic and radioactive media by surface ion-imprinted mesoporous silica sorbent. The sorbent was successfully synthesized by a co-condensation method with uranyl as the template ion and diethylphosphatoethyltriethoxysilane as the functional ligands. The pseudo-second-order model and Langmuir model showed better correlation with the sorption kinetic and isotherm data, and the sorption equilibrium could be reached within 40 min, the maximum adsorption capacity from Langmuir model was 80 mg/g in 1 mol/L nitric acid (HNO₃) solution at 298.15 K. The sorbent showed faster kinetics and higher selectivity toward uranium over other ions compared with nonimprinted mesoporous and other previous sorbents. Furthermore, the ion-imprinted materials exhibited remarkable radioresistance stability and could be regenerated efficiently after five cycles. This work may provide a new approach for highly efficient sorption of uranium from strong HNO₃ and radioactive media

Surface Ion-Imprinted Polypropylene Nonwoven Fabric for Potential Uranium Seawater Extraction with High Selectivity over Vanadium

Uranium seawater extraction is strategically important to guarantee the future supply for nuclear power generation. However, it is still a challenge to selectively capture uranium over vanadium in seawater. In this paper, we propose a new method for potential uranium seawater extraction with high selectivity over vanadium. Specifically, surface ion-imprinted polypropylene nonwoven fabric is prepared by copolymerization of 4-vinylbenzyl chloride and 1-vinylimidazole in the presence of uranyl tricarbonate complex. The sorption follows the pseudo-second-order model and can reach the equilibrium with a large capacity of 133.3 mg/g within 15 h at pH 8.0 and 298.15 K. The imprinted fabric shows excellent selectivity toward uranium over vanadium and the other coexisting ions in seawater. In addition, it exhibits good salt-resistant stability and can be regenerated efficiently after five cycles. This work indicates that the imprinted fabric may be a promising sorbent for potential uranium seawater extraction

Optical Extinction Properties of Perforated Gold-Silica-Gold Multilayer Nanoshells

Symmetry breaking in gold nanoshell (or multilayer nanoshells) can supply many interesting optical properties, which has been studied in gold nanostrucutres such as nanocup, nanoegg, and core offset gold-silica-gold multilayer nanoshells. In this work, the optical extinction properties of the perforated gold-silica-gold multilayer nanoshells are studied by the discrete dipole approximation method simulations and plasmon hybridization theory. The extinction spectra of these particles are sensitive to the orientation of the particle with respect to polarization of the light due to the symmetry breaking. Because of the coupling of the plasmon resonance modes between the inner gold sphere and the outer nanocup structure, the perforated gold-silica-gold nanoshell provides the additional plasmon resonance peak and an even greater spectral tunability comparing with the nanocup of similar dimensions. By changing the geometry of the particles, the extinction peaks of the particles can be easily tuned into the near-infrared region, which is favorable for biological applications. The local refractive index sensitivity of the particles is also investigated, and the multiple extinction peaks simultaneous shift is found as surrounding medium is altered. The perforated gold-silica-gold multilayer nanoshells may provide various applications ranging from angularly selective filters to biological sensors

Highlights;Prime Novelty Statement from Novel ternary nanocomposites of MWCNTs/PANI/MoS₂: preparation, characterization and enhanced electrochemical capacitance

1. Nanoflower-like MoS2 grown on the surface of MWCNTs/PANI nano-stem is successfully synthesized. 2. The obtained ternary hybrid exhibits a high capacitance of 542.56 F g-1 at 0.5 A g-1 and excellent cycling stability (73.7% capacitance retention) over 3000 cycles. 3. This work offers a potential electrode material for supercapacitors. ;In this work, a novel hierarchical structure, nanoflower-like MoS2 grown on the surface of MWCNTs/PANI nano-stem, is synthesized sucessfully. The obtained ternary nanocomposite exhibits excellent electrochemical performance, which can be used as the electrode material of supercapacitor

Biologically Inspired Polydopamine Capped Gold Nanorods for Drug Delivery and Light-Mediated Cancer Therapy

Multifunctional drug delivery and combined multimodal therapy strategies are very promising in tumor theranostic applications. In this work, a simple and versatile nanoplatform based on biologically inspired polydopamine capped gold nanorods (GNR-PDA) is developed. Dopamine, a well-known neurotransmitter associated with many neuronal disorders, can undergo self-polymerization on the surface of GNRs to form a stable PDA shell. Its unique molecular adsorption property, as well as its high chemical stability and biocompatibility, facilitate GNR-PDA as an ideal candidate for drug delivery. Methylene blue (MB) and doxorubicin (DOX) are directly adsorbed on GNR-PDA via electrostatic and/or π–π stacking interactions, forming GNR-PDA-MB and GNR-PDA-DOX nanocomposites, respectively. The GNR-PDA-MB can generate reactive oxygen species (ROS, from MB) or hyperthermia (from GNR-PDA) with high efficiency under deep-red/NIR laser irradiation, while the GNR-PDA-DOX exhibits light-enhanced drug release under NIR laser irradiation. The combined dual-modal light-mediated therapy, by using GNR-PDA-MB [photodynamic/photothermal therapy (PDT/PTT)] and GNR-PDA-DOX (Chemo/PTT), is carried out and shows remarkable cancer cell killing efficiency in vitro and significant suppression of tumor growth in vivo, which are much more distinct than any single-modal therapy strategy. Our work illustrates that GNR-PDA could be a promising nanoplatform for multifunctional drug delivery and multimodal tumor theranostics in the future

The effect of renal denervation on resistant hypertension: Meta-analysis of randomized controlled clinical trials

<p><i>Background</i>: This meta-analysis was conducted to evaluate the efficiency of renal denervation (RDN) on resistant hypertension. <i>Methods</i>: PubMed, EMBASE, and the Cochrane Central database were searched for eligible randomized controlled clinical trials (RCTs). Changes from the baseline of the office blood pressure and the 24-h ambulatory blood pressure were extracted. <i>Results</i>: Nine RCTs were included. RDN reduced the mean systolic blood pressure (SBP) and diastolic blood pressure (DBP) by −8.23 mm Hg (95%CI: −16.86, 0.39) and −3.77 mm Hg (95%CI: −7.21, −0.32), respectively, compared with the control. In the population with a baseline SBP more than 170 mm Hg, the RDN reduced SBP by −17.77 mm Hg (95%CI: −33.73, −1.82) and DBP by −7.51 mm Hg (95%CI: −12.58, −2.44). In the subgroup with no medication adjustment, the RDN reduced SBP by −15.56 mm Hg (95%CI: −26.33, −4.80) and DBP by −6.89 mm Hg (95%CI: −9.99, −3.79). The proportion of patients with SBP decrease of 10 mm Hg or more and the controlled office BP were not different between two groups. RDN reduced 24-h mean SBP and DBP by −3.34 mm Hg (95%CI: −5.30, −1.38) and −1.56 mm Hg (95%CI: −2.71, −0.41), respectively. The SBPs in the subgroups with higher baseline SBP and with no medication adjustment were significantly decreased after the HTN-3 was omitted. <i>Conclusion</i>: Radiofrequency RDN in a randomized manner did not have superiority compared with medical treatment at 6-month follow-up in general population. Current evidence provides insufficient evidence to support the use of such RDN strategy in the treatment of resistant hypertension. The result could not be used to extrapolate other strategies’ effect.</p

Recherches archéologiques au Luristan (Iran)

info:eu-repo/semantics/publishe

Solvent-Induced Assembly of Octacyanometalates-Based Coordination Polymers with Unique <i>afm</i>1 Topology and Magnetic Properties

Aqueous solution was introduced into the self-assembly of water-insoluble (Bu₃NH)₃[M­(CN)₈] (M = W, Mo) and Mn­(NO₃)₂·6H₂O to afford two, three-dimensional (3D) coordination polymers (CPs), {[μ₈-M^V(CN)₈Mn^II₂(H₂O)₂(CH₃OH)]­[NO₃]}_<i>n</i> (M = W <b>1</b>, Mo <b>2</b>), while polymer {[μ₄-W^V(CN)₈Mn^II₂(DMF)₈]­(ClO₄)}_<i>n</i> (DMF = <i>N</i>,<i>N</i>-dimethylformamide) (<b>3</b>) was crystallized from the reaction of (Bu₃NH)₃[W­(CN)₈] and Mn­(ClO₄)₂·6H₂O in DMF. All three CPs <b>1</b>, <b>2</b>, and <b>3</b> have been well-characterized by elemental analysis, infrared spectra, single-crystal X-ray diffraction, as well as thermogravimetric analysis. The single-crystal X-ray structural analysis shows that both CPs <b>1</b> and <b>2</b> crystallize in the monoclinic crystal system with space group of <i>C</i>2/<i>c</i> and possess the infinite 3D framework in an unprecedented <i>afm</i>1 topology geometry, which is an unreported 4-nodal 4,4,8,8-coordinated net with point symbol {4¹¹.6¹².8⁵}­{4¹⁷.6¹⁰.8}­{4⁵.6}₄. Polymer <b>3</b> crystallizes in the space group of <i>P</i>4₂/<i>m</i> as a 3D supermolecule structure, which is constructed by one-dimensional (1D) cationic {[μ₄-W^V(CN)₈Mn^II₂(DMF)₈]⁺}_<i>n</i> chains linked via the hydrogen bonds. Magnetic susceptibility measurements in the temperature range of 2–300 K reveal that CPs <b>1</b> and <b>2</b> exhibit the similar typical antiferromagnetic properties, while CP <b>3</b> shows the ferromagnetic property

A Three-Dimensional Hetero-Bimetallic Coordination Polymer with Unusual (4,5)-Connected Topology and Ferrimagnetic Property Based on Octacyanotungstate and Polydentate Ligand

A three-dimensional (3D) manganese–tungsten bimetallic coordination polymer (CP) {{[μ₅-W­(CN)₈]₂­[Mn­(HMTA)_1.5]₂­[Mn­(HMTA)­(H₂O)₂]}­·2H₂O}_<i>n</i> (CP-<b>1</b>) (HMTA = hexamethylenetetramine) is constructed by the reaction of the molecular building block [W­(CN)₈]^3– and tetradentate bridging ligand HMTA with d⁵ transition metal ion Mn²⁺. CP-<b>1</b> has been unambiguously confirmed by Fourier-transform infrared spectroscopy, elemental analysis, thermogravimetric analysis, and single-crystal and powder X-ray diffraction. Crystallographic analysis reveals that, crystallizing in the monoclinic crystal system with <i>P</i>2₁/<i>c</i> space group, CP-<b>1</b> possesses an infinite 3D framework and exhibits an unusual (4,5)-connected <b>4,5T7</b> topology with point symbol (3²·6²·7²)­(3·4⁴·5²·6²·7)₄. The extended 3D structure is constructed by two-dimensional (2D) cyano-bridged corrugated -W–Mn2–W–Mn2- layers pillared via the [Mn1­(HMTA)­(H₂O)₂] units. The magnetic investigation indicates ferrimagnetic behavior for CP-<b>1</b> because of the antiferromagnetic coupling between W^V (<i>S</i> = 1/2) and Mn^II (<i>S</i> = 5/2) centers mediated by cyano bridges

Solvent-Induced Assembly of Octacyanometalates-Based Coordination Polymers with Unique <i>afm</i>1 Topology and Magnetic Properties

Aqueous solution was introduced into the self-assembly of water-insoluble (Bu₃NH)₃[M­(CN)₈] (M = W, Mo) and Mn­(NO₃)₂·6H₂O to afford two, three-dimensional (3D) coordination polymers (CPs), {[μ₈-M^V(CN)₈Mn^II₂(H₂O)₂(CH₃OH)]­[NO₃]}_<i>n</i> (M = W <b>1</b>, Mo <b>2</b>), while polymer {[μ₄-W^V(CN)₈Mn^II₂(DMF)₈]­(ClO₄)}_<i>n</i> (DMF = <i>N</i>,<i>N</i>-dimethylformamide) (<b>3</b>) was crystallized from the reaction of (Bu₃NH)₃[W­(CN)₈] and Mn­(ClO₄)₂·6H₂O in DMF. All three CPs <b>1</b>, <b>2</b>, and <b>3</b> have been well-characterized by elemental analysis, infrared spectra, single-crystal X-ray diffraction, as well as thermogravimetric analysis. The single-crystal X-ray structural analysis shows that both CPs <b>1</b> and <b>2</b> crystallize in the monoclinic crystal system with space group of <i>C</i>2/<i>c</i> and possess the infinite 3D framework in an unprecedented <i>afm</i>1 topology geometry, which is an unreported 4-nodal 4,4,8,8-coordinated net with point symbol {4¹¹.6¹².8⁵}­{4¹⁷.6¹⁰.8}­{4⁵.6}₄. Polymer <b>3</b> crystallizes in the space group of <i>P</i>4₂/<i>m</i> as a 3D supermolecule structure, which is constructed by one-dimensional (1D) cationic {[μ₄-W^V(CN)₈Mn^II₂(DMF)₈]⁺}_<i>n</i> chains linked via the hydrogen bonds. Magnetic susceptibility measurements in the temperature range of 2–300 K reveal that CPs <b>1</b> and <b>2</b> exhibit the similar typical antiferromagnetic properties, while CP <b>3</b> shows the ferromagnetic property