8 research outputs found
Adsorption Removal of Glycidyl Esters from Palm Oil and Oil Model Solution by Using Acid-Washed Oil Palm Wood-Based Activated Carbon: Kinetic and Mechanism Study
Acid-washed
oil palm wood-based activated carbon (OPAC) has been
investigated for its potential application as a promising adsorbent
in the removal of glycidyl esters (GEs) from both palm oil and oil
model (hexadecane) solution. It was observed that the removal rate
of GEs in palm oil was up to >95%, which was significantly higher
than other adsorbents used in this study. In batch adsorption system,
the adsorption efficiency and performance of acid-washed OPAC were
evaluated as a function of several experimental parameters such as
contact time, initial glycidyl palmitate (PGE) concentration, adsorbent
dose, and temperature. The Langmuir, Freundlich, and Dubinin–Radushkevich
models were used to describe the adsorption equilibrium isotherm,
and the equilibrium data were fitted best by the Langmuir model. The
maximum adsorption capacity of acid-washed OPAC was found to be 36.23
mg/g by using the Langmuir model. The thermodynamic analysis indicated
that the adsorption of PGE on acid-washed OPAC was an endothermic
and physical process in nature. The experimental data were fitted
by using pseudo-first-order, pseudo-second-order, and intraparticle
diffusion models. It was found that the kinetic of PGE adsorption
onto acid-washed OPAC followed well the pseudo-second-order model
for various initial PGE concentrations and the adsorption process
was controlled by both film diffusion and intraparticle diffusion.
The desorption test indicated the removal of GEs from palm oil was
attributed to not only the adsorption of GEs on acid-washed OPAC,
but also the degradation of GEs adsorbed at activated sites with acidic
character. Furthermore, no significant difference between before and
after PGE adsorption in oil quality was observed
Syntheses, Structures, Luminescence, and Magnetic Properties of a Series of Novel Coordination Polymers Constructed by Nanosized [Ln<sub>8</sub>Fe<sub>4</sub>] Rings
A total
of five three-dimensional Ln-Fe coordination polymers (CPs)
[(CH<sub>3</sub>)<sub>2</sub>NH]Â[(CH<sub>3</sub>)<sub>2</sub>NH<sub>2</sub>]Â[Ln<sub>2</sub>FeÂ(SO<sub>4</sub>)<sub>4</sub>(L)]·3H<sub>2</sub>O (Ln = Eu, <b>1</b>; Dy, <b>2</b>; Gd, <b>3</b>; Sm, <b>4</b>; Er, <b>5</b>; H<sub>2</sub>L = tartaric acid) have been successfully synthesized
under solvothermal conditions and characterized by infrared spectroscopy,
thermogravimetric analysis, elemental analyses, luminescence, and
magnetic properties. Structural analysis indicates that the frameworks
of <b>1</b>–<b>5</b> are constructed from novel
[Ln<sub>8</sub>Fe<sub>4</sub>] rings. In the strcutures of <b>1</b>–<b>5</b>, Ln<sup>III</sup> and Fe<sup>III</sup> ions
interconnect through O donors of sulfate anions to generate a one-dimensional
chain, and the adjacent chains are joined together by ligand [L]<sup>2–</sup> to form a two-dimensional zonary plane, which is
further bridged by ligand [L]<sup>2–</sup> to give a new topology
and named as “<i><b>Xhd</b></i><b>1</b>”. Magnetic properties of <b>2</b> and <b>3</b> were investigated using variable temperature magnetic susceptibility,
and weak ferromagnetic exchange between the Fe<sup>III</sup> and Ln<sup>III</sup> ions has been established for the Gd derivative. Meanwhile,
we also studied luminescence spectra and luminescence lifetimes of <b>1</b> and <b>4</b> in the solid state at room temperature.
The luminescence lifetime of <b>1</b> is 0.98 ms, which is significantly
longer than the values in the reported Eu<sup>3+</sup> coordination
polymers
Syntheses of new topology BTTB-based metal–organic frameworks in CH<sub>3</sub>CN/H<sub>2</sub>O mixed solvents
<p>Three complexes, [Zn<sub>2</sub>(BTTB)](H<sub>2</sub>O)<sub>5</sub> [BTTB = 4,4′,4″,4′″-benzene-1,2,4,5-tetrayltetrabenzoate, also named 1,2,4,5-tetrakis(carboxyphenyl) benzene] (<b>1</b>), [Cd<sub>2</sub>(BTTB)(H<sub>2</sub>O)<sub>5</sub>](H<sub>2</sub>O)<sub>3</sub> (<b>2</b>) and [Mn<sub>2</sub>(BTTB)(H<sub>2</sub>O)<sub>5</sub>](H<sub>2</sub>O)<sub>2</sub> (<b>3</b>), have been synthesized under hydrothermal conditions in CH<sub>3</sub>CN/H<sub>2</sub>O. Structural analyses revealed that <b>1</b> has new topologies, i.e. <b><i>nnu1</i></b> (<b><i>nnu</i></b> stands for Nanjing Normal University) or <b><i>nnu2</i></b> depending on the different simplification schemes. Compounds <b>2</b> and <b>3</b> are isostructural and have a <b><i>scu</i></b> (square planar and cubical vertices) topology, which have not been reported for BTTB-based metal–organic frameworks. Thermal stability of <b>1</b>–<b>3</b>, hydrogen adsorption/desorption properties of <b>2</b> and <b>3</b>, and luminescent properties of <b>1</b> and <b>2</b> were investigated. Compounds <b>1</b>–<b>3</b> are stable in air.</p
Additional file 1: of Competing endogenous RNA expression profiling in pre-eclampsia identifies hsa_circ_0036877 as a potential novel blood biomarker for early pre-eclampsia
The demographic characteristics of  the pregnant women which 12 placentas were from. The demographic characteristics of the pregnant women which blood samples were from. The top 10 differentially expressed circRNAs in placenta of PE using microarray analyses. Oligonucleotide primer sequences for qRT-PCR. Study disign. The variability between controls in microarray vs variability between PE samples was shown in BOX plot. Hsa_circ_0036877 can function as a ceRNA in the PE placenta. The correlation between the expression in placenta and maternal blood from the same individuals in the PE and non-PE grounps. (PDF 967 kb
POM Constructed from Super-Sodalite Cage with Extra-Large 24-Membered Channels: Effective Sorbent for Uranium Adsorption
A POMs-based
sorbent functionalized by phosphate groups: H<sub>33</sub>Na<sub>14</sub>Mo<sup>V</sup><sub>24</sub>Mo<sup>VI</sup><sub>2</sub>(PO<sub>4</sub>)<sub>11</sub>O<sub>73</sub> has been
successfully isolated under hydrothermal conditions. The cooperative
assembly of the ring-shaped polyoxometalate structural building unit
{P<sub>4</sub>Mo<sub>6</sub>} and MoO<sub>4</sub> tetrahedra linkers
gives rise to an unprecedented supersodalite cage containing approximately
spherical cavities with a 8.76 Ă… diameter. As POMs-based inorganic
material, compound <b>1</b> was first applied as sorbent to
adsorb UÂ(VI) from aqueous solution, exhibiting good stability, high
efficiency, and selectivity. The maximum sorption capacity reaches
325.9 mg g<sup>–1</sup>, which may capture radionuclides through
cooperative binding of the phosphate groups. The adsorbed UÂ(VI) could
be nearly drastically eluted when using 0.1 M Na<sub>2</sub>CO<sub>3</sub> and the sorption capacity for UÂ(VI) slightly decreased 10.16%
through five successive sorption/desorption cycles. This work represents
first application of POMs-based inorganic materials as sorbent to
adsorb uranium from aqueous solution and provides a feasible approach
for the entrapment and recovery of radionuclides
POM Constructed from Super-Sodalite Cage with Extra-Large 24-Membered Channels: Effective Sorbent for Uranium Adsorption
A POMs-based
sorbent functionalized by phosphate groups: H<sub>33</sub>Na<sub>14</sub>Mo<sup>V</sup><sub>24</sub>Mo<sup>VI</sup><sub>2</sub>(PO<sub>4</sub>)<sub>11</sub>O<sub>73</sub> has been
successfully isolated under hydrothermal conditions. The cooperative
assembly of the ring-shaped polyoxometalate structural building unit
{P<sub>4</sub>Mo<sub>6</sub>} and MoO<sub>4</sub> tetrahedra linkers
gives rise to an unprecedented supersodalite cage containing approximately
spherical cavities with a 8.76 Ă… diameter. As POMs-based inorganic
material, compound <b>1</b> was first applied as sorbent to
adsorb UÂ(VI) from aqueous solution, exhibiting good stability, high
efficiency, and selectivity. The maximum sorption capacity reaches
325.9 mg g<sup>–1</sup>, which may capture radionuclides through
cooperative binding of the phosphate groups. The adsorbed UÂ(VI) could
be nearly drastically eluted when using 0.1 M Na<sub>2</sub>CO<sub>3</sub> and the sorption capacity for UÂ(VI) slightly decreased 10.16%
through five successive sorption/desorption cycles. This work represents
first application of POMs-based inorganic materials as sorbent to
adsorb uranium from aqueous solution and provides a feasible approach
for the entrapment and recovery of radionuclides
Comparison of different uptake patterns in <sup>18</sup>F-AIF-NOTA-PRGD2 PET and <sup>18</sup>F-FDG PET.
<p>The enlarged lymph node identified on CT (A1 and B1) had significantly higher uptake of <sup>18</sup>F-FDG PET (B2–B3) than that for <sup>18</sup>F-AIF-NOTA-PRGD2 (A2–A3).</p
Comparison of SUVs from <sup>18</sup>F-FDG PET and <sup>18</sup>F-AIF-NOTA-PRGD2 PET for all malignant lesions.
<p>Comparison of SUVs from <sup>18</sup>F-FDG PET and <sup>18</sup>F-AIF-NOTA-PRGD2 PET for all malignant lesions.</p