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Active areas of research on chemical looping technologies for the conversion of CO2 to CO are contrasted and discussed, including current performance, methods for material design, and next steps in expanding their development. Generation of CO from CO2 is of interest in sustainable chemistry and engineering to convert anthropogenic CO2 emissions into feedstock for Fischer–Tropsch (FT), methanol to gasoline (MTG), gas-to-liquid (GTL), and other synthesis pathways for fuels and materials. Chemical looping strategies have been identified which not only produce CO, but also H2 from H2O and methane sources, supplying the other key component of syngas. Configurations of these chemical looping technologies into the materials economy potentially constitute sustainable carbon loop cycles for fuels as well as carbon sequestration into industrial and commercial materials. Major areas of research in CO2 conversion by chemical looping, collectively referred to here as CO2CL, including Solar-Thermal Chemical Looping (STCL), Reverse Water Gas Shift Chemical Looping (RWGS-CL), Chemical Looping Reforming (CLR), Super Dry Reforming (SDR), Autothermal Catalyst Assisted Chemical Looping (ACACL), and Reverse Boudouard Reforming (RBR) are discussed in terms of their process characteristics, historical development of oxygen carrier (OC) material, state of the art methods for material design, and future work needed to advance the scale-up of these technologies. This perspective centers around the non-methane utilizing processes for CO2CL, focusing on the phenomena of oxygen transfer between gas molecules and the oxygen carrier (OC). [ABSTRACT FROM AUTHOR]

Poly(catechin) (p(CAT)) nanoparticles (NPs), 173 ± 4 nm was prepared as a therapeutic agent with hydrolytic degradability affording sustainable CAT release over 20 d at carcinogenic conditions, pH 5.5 and 37.5 °C. Cell viability studies on MC38 colon cancer cells revealed the anticancer potential of p(CAT) NPs with 691 µg/mL IC50 value while being well-tolerated by nonmalignant CCD841 CoN colon cells at 72 h incubation-time. P(CAT) NPs showed effective antioxidant capacity with 241 ± 7 and 456 ± 54 µg/mL of GA equivalency of total phenol content (TPC), and total flavonoid content (TFC) values and 1.19 ± 0.8 µmol/g Trolox equivalent antioxidant capacity by 2,2'-Azino-bis-(3-ethylbenzothioazoline-6-sulfonic acid (ABTS•+) scavenging assay. [ABSTRACT FROM AUTHOR]

The development of sensitive and selective electrodes for electrochemical detection of ascorbic acid (AA), dopamine (DA) and uric acid (UA) is essential for early diagnosis and effective treatment. In this work, a nanocomposite of two-dimensional WSe2 nanosheets with carbon black (WSe2@C) was prepared by facile hydrothermal method and used to modify a glassy carbon electrode (GCE) to fabricate an electrochemical sensing platform for simultaneous determination of AA, DA and UA. The as-prepared nanocomposite was characterized in terms of structural and morphological analyses through X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrochemical and electrocatalytic behaviors of the modified electrode (GCE-WSe2@C) were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. The sensing performance of GCE-WSe2@C electrode was tested against AA, DA and UA, resulting in enhanced electrocatalytic properties compared to GCE-WSe2 and GCE-C electrodes. The GCE-WSe2@C electrode displayed wide linear ranges of 8.0 - $2456 \mu \text{M}$ for AA, 1.0 - 49.0 & 72.8 - $381.4 \mu \text{M}$ for DA and 1.0– 24.8 & 36.9– $185.2 \mu \text{M}$ for UA with low detection limits of 3.2, 0.18 and $0.42 \mu \text{M}$ , respectively. In addition, the developed electrode demonstrated high reproducibility and stability for electrochemical detection of AA, DA and UA. [ABSTRACT FROM AUTHOR]