Homojunction-Incorporated Oxygen Vacancy Functionalized Spherical TiO Nanocrystals for the Electrochemical Detection of Chemical Oxygen Demand.

Chemical oxygen demand (COD) is a critical criterion for the analytical assessment of the degree of organic contaminants in an aqueous system. Typically, toxic and expensive reagents are employed in standardized COD analysis methods, leading to secondary pollution. In this work, we developed a rapid electrochemical method for COD detection based on the oxidation of hydroxyl radicals for organics in water by using oxygen vacancy doped anatase/rutile-TiO nanoparticles as electrooxidation catalysts.

Ketonized Carbonitride Assembled Face Mask with Long-Term Light Triggered Antimicrobial Ability for Bioprotective Applications.

The worldwide transmission of infectious respiratory pathogens has caused innumerable deaths and suffering, while wearing a face mask is still the most effective way to terminate the respiratory infections spread. However, the frequent mask replacement as a result of the lack of pathogen sterilization ability not only increases the cross-contamination risk but also, even worse, produces a large amount of medical waste. In this work, we report on a ketonized carbonitride functionalized bioprotective face mask with pathogen sterilization activity that can effectively produce biocidal singlet oxygen triggered by light irradiation.

Bioprotective Respirator Assembled by Defective Carbon Nitride for Long-Term Light Triggered Health Protection.

Wearing face masks is the best way to stop the spread of respiratory infections. However, if masks are not sterilized, changing them too frequently can actually increase the risk of cross-contamination. Herein, the construction of an antipathogen photocatalytic mask with carbon vacancy-modified carbon nitride nanosheets (g-CN-V Ns) coated on the non-woven fabrics of the out layer of the mask, offering effective and long-term protection against damaging pathogens when exposed to light is reported.

Adsorption performance and its mechanism of aqueous As(III) on polyporous calcined oyster shell-supported Fe-Mn binary oxide.

Fe-Mn binary oxide (FMBO) is a promising adsorbent for As(III) removal through combined adsorption and oxidation. The calcined oyster shell-supported Fe-Mn binary oxide (FMBO/OS) adsorbent was synthesized by the co-precipitation method. Results indicated that the calcined oyster shell, as a carrier, improved the stability of FMBO and its adsorption capacity for As(III).

3D VO-MoS/rGO nanocomposites with enhanced peroxidase mimicking activity for sensitive colorimetric determination of HO and glucose.

In this work, we reported a novel nanozyme (3D VO-MoS/rGO) by decorating MoS nano-flowers and VO nanoparticles on reduced graphene oxide (rGO). The 3D VO-MoS/rGO nanocomposites exhibited intrinsic peroxidase mimicking activity and catalyzed the oxidation of 3, 3', 5, 5'-tetramethylbenzidine (TMB) to produce a blue colored product in the presence of HO. Compared with horseradish peroxidase (HRP), 3D VO-MoS/rGO nanocomposites displayed high catalytic velocity (V) and affinity (K) for substrates (HO and TMB).

Drift Reduction of a 4-DOF Measurement System Caused by Unstable Air Refractive Index.

Laser beam drift greatly influences the accuracy of a four degrees of freedom (4-DOF) measurement system during the detection of machine tool errors, especially for long-distance measurement. A novel method was proposed using bellows to serve as a laser beam shield and air pumps to stabilize the refractive index of air. The inner diameter of the bellows and the control mode of the pumps were optimized through theoretical analysis and simulation.

A New Method for Measuring the Rotational Angles of a Precision Spherical Joint Using Eddy Current Sensors.

Precision spherical joint is a spherical motion pair that can realize rotation with three degrees of freedom. This joint is widely used in robots, parallel mechanisms, and high-end medical equipment, as well as in aerospace and other fields. However, the rotation orientation and angle cannot be determined when the joint is in passive motion.

Bimetallic Fe/Mn metal-organic-frameworks and Au nanoparticles anchored carbon nanotubes as a peroxidase-like detection platform with increased active sites and enhanced electron transfer.

A hybrid of metal-organic frameworks (Fe, Mn) and Au nanoparticles anchored carbon nanotubes (Au/MOFs(Fe, Mn)/CNTs) was fabricated by a facile one-step hydrothermal process. The Au/MOFs(Fe, Mn)/CNTs exhibit highly enhanced peroxidase-like activity, because of the increased active sites, the enhanced partial charge density and electron transfer among the Fermi level of MOFs, Au and CNTs, as well as the synergistic action of Fe and Mn. The hybrid nanomaterials with high catalytic velocity (V = 17.

Photoelectrochemical aptasensor for sulfadimethoxine using g-CN quantum dots modified with reduced graphene oxide.

A novel photoelectrochemical (PEC) aptasensor with graphitic-phase carbon nitride quantum dots (g-CN; QDs) and reduced graphene oxide (rGO) was fabricated. The g-CN QDs possess enhanced emission quantum yield (with an emission peak at 450 nm), improved charge separation ability and effective optical absorption, while rGO has excellent electron transfer capability. Altogether, this results in improved PEC performance.