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 [Ln₈Fe₄] Rings

A total of five three-dimensional Ln-Fe coordination polymers (CPs) [(CH₃)₂NH]­[(CH₃)₂NH₂]­[Ln₂Fe­(SO₄)₄(L)]­·3H₂O (Ln = Eu, <b>1</b>; Dy, <b>2</b>; Gd, <b>3</b>; Sm, <b>4</b>; Er, <b>5</b>; H₂L = 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 [Ln₈Fe₄] rings. In the strcutures of <b>1</b>–<b>5</b>, Ln^III and Fe^III ions interconnect through O donors of sulfate anions to generate a one-dimensional chain, and the adjacent chains are joined together by ligand [L]^2– to form a two-dimensional zonary plane, which is further bridged by ligand [L]^2– 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^III and Ln^III 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 Eu³⁺ coordination polymers

Syntheses of new topology BTTB-based metal–organic frameworks in CH₃CN/H₂O mixed solvents

<p>Three complexes, [Zn₂(BTTB)](H₂O)₅ [BTTB = 4,4′,4″,4′″-benzene-1,2,4,5-tetrayltetrabenzoate, also named 1,2,4,5-tetrakis(carboxyphenyl) benzene] (<b>1</b>), [Cd₂(BTTB)(H₂O)₅](H₂O)₃ (<b>2</b>) and [Mn₂(BTTB)(H₂O)₅](H₂O)₂ (<b>3</b>), have been synthesized under hydrothermal conditions in CH₃CN/H₂O. 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: H₃₃Na₁₄Mo^V₂₄Mo^VI₂(PO₄)₁₁O₇₃ has been successfully isolated under hydrothermal conditions. The cooperative assembly of the ring-shaped polyoxometalate structural building unit {P₄Mo₆} and MoO₄ tetrahedra linkers gives rise to an unprecedented supersodalite cage containing approximately spherical cavities with a 8.76 Å diameter. As POMs-based inorganic material, compound <b>1</b> was first applied as sorbent to adsorb U­(VI) from aqueous solution, exhibiting good stability, high efficiency, and selectivity. The maximum sorption capacity reaches 325.9 mg g^–1, which may capture radionuclides through cooperative binding of the phosphate groups. The adsorbed U­(VI) could be nearly drastically eluted when using 0.1 M Na₂CO₃ and the sorption capacity for U­(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: H₃₃Na₁₄Mo^V₂₄Mo^VI₂(PO₄)₁₁O₇₃ has been successfully isolated under hydrothermal conditions. The cooperative assembly of the ring-shaped polyoxometalate structural building unit {P₄Mo₆} and MoO₄ tetrahedra linkers gives rise to an unprecedented supersodalite cage containing approximately spherical cavities with a 8.76 Å diameter. As POMs-based inorganic material, compound <b>1</b> was first applied as sorbent to adsorb U­(VI) from aqueous solution, exhibiting good stability, high efficiency, and selectivity. The maximum sorption capacity reaches 325.9 mg g^–1, which may capture radionuclides through cooperative binding of the phosphate groups. The adsorbed U­(VI) could be nearly drastically eluted when using 0.1 M Na₂CO₃ and the sorption capacity for U­(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 ¹⁸F-AIF-NOTA-PRGD2 PET and ¹⁸F-FDG PET.

<p>The enlarged lymph node identified on CT (A1 and B1) had significantly higher uptake of ¹⁸F-FDG PET (B2–B3) than that for ¹⁸F-AIF-NOTA-PRGD2 (A2–A3).</p

Comparison of SUVs from ¹⁸F-FDG PET and ¹⁸F-AIF-NOTA-PRGD2 PET for all malignant lesions.

<p>Comparison of SUVs from ¹⁸F-FDG PET and ¹⁸F-AIF-NOTA-PRGD2 PET for all malignant lesions.</p