8 research outputs found
Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals
Water contamination
from industrial and anthropogenic activities is nowadays a major issue
in many countries worldwide. To address this problem, efficient water
treatment technologies are required. Recent efforts have focused on
the development of self-propelled micromotors that provide enhanced
micromixing and mass transfer by the transportation of reactive species,
resulting in higher decontamination rates. However, a real application
of these micromotors is still limited due to the high cost associated
to their fabrication process. Here, we present Fe<sub>2</sub>O<sub>3</sub>-decorated SiO<sub>2</sub>/MnO<sub>2</sub> microjets for the
simultaneous removal of industrial organic pollutants and heavy metals
present in wastewater. These microjets were synthesized by low-cost
and scalable methods. They exhibit an average speed of 485 ±
32 μm s<sup>–1</sup> (∼28 body length per s) at
7% H<sub>2</sub>O<sub>2</sub>, which is the highest reported for MnO<sub>2</sub>-based tubular micromotors. Furthermore, the photocatalytic
and adsorbent properties of the microjets enable the efficient degradation
of organic pollutants, such as tetracycline and rhodamine B under
visible light irradiation, as well as the removal of heavy metal ions,
such as Cd<sup>2+</sup> and Pb<sup>2+</sup>
Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals
Water contamination
from industrial and anthropogenic activities is nowadays a major issue
in many countries worldwide. To address this problem, efficient water
treatment technologies are required. Recent efforts have focused on
the development of self-propelled micromotors that provide enhanced
micromixing and mass transfer by the transportation of reactive species,
resulting in higher decontamination rates. However, a real application
of these micromotors is still limited due to the high cost associated
to their fabrication process. Here, we present Fe<sub>2</sub>O<sub>3</sub>-decorated SiO<sub>2</sub>/MnO<sub>2</sub> microjets for the
simultaneous removal of industrial organic pollutants and heavy metals
present in wastewater. These microjets were synthesized by low-cost
and scalable methods. They exhibit an average speed of 485 ±
32 μm s<sup>–1</sup> (∼28 body length per s) at
7% H<sub>2</sub>O<sub>2</sub>, which is the highest reported for MnO<sub>2</sub>-based tubular micromotors. Furthermore, the photocatalytic
and adsorbent properties of the microjets enable the efficient degradation
of organic pollutants, such as tetracycline and rhodamine B under
visible light irradiation, as well as the removal of heavy metal ions,
such as Cd<sup>2+</sup> and Pb<sup>2+</sup>
Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals
Water contamination
from industrial and anthropogenic activities is nowadays a major issue
in many countries worldwide. To address this problem, efficient water
treatment technologies are required. Recent efforts have focused on
the development of self-propelled micromotors that provide enhanced
micromixing and mass transfer by the transportation of reactive species,
resulting in higher decontamination rates. However, a real application
of these micromotors is still limited due to the high cost associated
to their fabrication process. Here, we present Fe<sub>2</sub>O<sub>3</sub>-decorated SiO<sub>2</sub>/MnO<sub>2</sub> microjets for the
simultaneous removal of industrial organic pollutants and heavy metals
present in wastewater. These microjets were synthesized by low-cost
and scalable methods. They exhibit an average speed of 485 ±
32 μm s<sup>–1</sup> (∼28 body length per s) at
7% H<sub>2</sub>O<sub>2</sub>, which is the highest reported for MnO<sub>2</sub>-based tubular micromotors. Furthermore, the photocatalytic
and adsorbent properties of the microjets enable the efficient degradation
of organic pollutants, such as tetracycline and rhodamine B under
visible light irradiation, as well as the removal of heavy metal ions,
such as Cd<sup>2+</sup> and Pb<sup>2+</sup>
Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals
Water contamination
from industrial and anthropogenic activities is nowadays a major issue
in many countries worldwide. To address this problem, efficient water
treatment technologies are required. Recent efforts have focused on
the development of self-propelled micromotors that provide enhanced
micromixing and mass transfer by the transportation of reactive species,
resulting in higher decontamination rates. However, a real application
of these micromotors is still limited due to the high cost associated
to their fabrication process. Here, we present Fe<sub>2</sub>O<sub>3</sub>-decorated SiO<sub>2</sub>/MnO<sub>2</sub> microjets for the
simultaneous removal of industrial organic pollutants and heavy metals
present in wastewater. These microjets were synthesized by low-cost
and scalable methods. They exhibit an average speed of 485 ±
32 μm s<sup>–1</sup> (∼28 body length per s) at
7% H<sub>2</sub>O<sub>2</sub>, which is the highest reported for MnO<sub>2</sub>-based tubular micromotors. Furthermore, the photocatalytic
and adsorbent properties of the microjets enable the efficient degradation
of organic pollutants, such as tetracycline and rhodamine B under
visible light irradiation, as well as the removal of heavy metal ions,
such as Cd<sup>2+</sup> and Pb<sup>2+</sup>
Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals
Water contamination
from industrial and anthropogenic activities is nowadays a major issue
in many countries worldwide. To address this problem, efficient water
treatment technologies are required. Recent efforts have focused on
the development of self-propelled micromotors that provide enhanced
micromixing and mass transfer by the transportation of reactive species,
resulting in higher decontamination rates. However, a real application
of these micromotors is still limited due to the high cost associated
to their fabrication process. Here, we present Fe<sub>2</sub>O<sub>3</sub>-decorated SiO<sub>2</sub>/MnO<sub>2</sub> microjets for the
simultaneous removal of industrial organic pollutants and heavy metals
present in wastewater. These microjets were synthesized by low-cost
and scalable methods. They exhibit an average speed of 485 ±
32 μm s<sup>–1</sup> (∼28 body length per s) at
7% H<sub>2</sub>O<sub>2</sub>, which is the highest reported for MnO<sub>2</sub>-based tubular micromotors. Furthermore, the photocatalytic
and adsorbent properties of the microjets enable the efficient degradation
of organic pollutants, such as tetracycline and rhodamine B under
visible light irradiation, as well as the removal of heavy metal ions,
such as Cd<sup>2+</sup> and Pb<sup>2+</sup>
Metal-Oxide-Based Microjets for the Simultaneous Removal of Organic Pollutants and Heavy Metals
Water contamination
from industrial and anthropogenic activities is nowadays a major issue
in many countries worldwide. To address this problem, efficient water
treatment technologies are required. Recent efforts have focused on
the development of self-propelled micromotors that provide enhanced
micromixing and mass transfer by the transportation of reactive species,
resulting in higher decontamination rates. However, a real application
of these micromotors is still limited due to the high cost associated
to their fabrication process. Here, we present Fe<sub>2</sub>O<sub>3</sub>-decorated SiO<sub>2</sub>/MnO<sub>2</sub> microjets for the
simultaneous removal of industrial organic pollutants and heavy metals
present in wastewater. These microjets were synthesized by low-cost
and scalable methods. They exhibit an average speed of 485 ±
32 μm s<sup>–1</sup> (∼28 body length per s) at
7% H<sub>2</sub>O<sub>2</sub>, which is the highest reported for MnO<sub>2</sub>-based tubular micromotors. Furthermore, the photocatalytic
and adsorbent properties of the microjets enable the efficient degradation
of organic pollutants, such as tetracycline and rhodamine B under
visible light irradiation, as well as the removal of heavy metal ions,
such as Cd<sup>2+</sup> and Pb<sup>2+</sup>
Controlled Photocatalytic Oxidation of Methane to Methanol through Surface Modification of Beta Zeolites
The
selective oxidation of methane to methanol is achieved by means of
a photocatalytic process. For this purpose, designed Bi- and V-containing
beta zeolites prepared by incipient wetness impregnation have been
used under different test conditions. While the zeolite proves to
be photoactive under UVC irradiation toward the total oxidation process,
the formation of V<sub>2</sub>O<sub>5</sub> on the surface is an effective
alternative for modifying the acid–base surface properties,
thus significantly decreasing the undesired CO<sub>2</sub> formation.
At the same time the zeolite framework serves as a scaffold for increasing
the surface area and distribution of the metal oxide. Additionally,
the addition of low Bi amount favors the formation of a BiVO<sub>4</sub>/V<sub>2</sub>O<sub>5</sub> heterojunction, which acts as a visible
light photocatalyst while at the same leading to total selectivity
to methanol at the expense of ethylene formation
Discovery of Vibegron: A Potent and Selective β<sub>3</sub> Adrenergic Receptor Agonist for the Treatment of Overactive Bladder
The discovery of vibegron, a potent
and selective human β<sub>3</sub>-AR agonist for the treatment
of overactive bladder (OAB),
is described. An early-generation clinical β<sub>3</sub>-AR
agonist MK-0634 (<b>3</b>) exhibited efficacy in humans for
the treatment of OAB, but development was discontinued due to unacceptable
structure-based toxicity in preclinical species. Optimization of a
series of second-generation pyrrolidine-derived β<sub>3</sub>-AR agonists included reducing the risk for phospholipidosis, the
risk of formation of disproportionate human metabolites, and the risk
of formation of high levels of circulating metabolites in preclinical
species. These efforts resulted in the discovery of vibegron, which
possesses improved druglike properties and an overall superior preclinical
profile compared to MK-0634. Structure–activity relationships
leading to the discovery of vibegron and a summary of its preclinical
profile are described