Evaluation of the immobilized enzymes function in soil remediation following polycyclic aromatic hydrocarbon contamination.

The bioremediation of polycyclic aromatic hydrocarbon (PAHs) from soil utilizing microorganisms, enzymes, microbial consortiums, strains, etc. has attracted a lot of interest due to the environmentally friendly, and cost-effective features. Enzymes can efficiently break down PAHs in soil by hydroxylating the benzene ring, breaking the C-C bond, and catalyze the hydroxylation of a variety of benzene ring compounds via single-electron transfer oxidation.

Selective catalytic oxidation of DMF over Cu-Ce/H-MOR by modulating the surface active sites.

Selective catalytic oxidation of the hazardous DMF exhaust gas presents a significant challenge in balancing oxidation activity and products selectivity (CO, NO, N, etc.). It is found that Cu/H-MOR demonstrates superior performance for DMF oxidation compared to CuO on other supports (γ-AlO, HY, ZSM-5) in terms of product selectivity and stability.

Type 2 diabetes mellitus increases postoperative recurrence risk in Chinese patients with chronic rhinosinusitis.

Background: The effect of type 2 diabetes mellitus (T2DM) on postoperative recurrence of chronic sinusitis (CRS) is unclear.

Objective: To investigate the association between T2DM and postoperative recurrence in CRS patients.

Methods: CRS patients who underwent surgery in our hospital from January 2018 to April 2020 were included and followed up for three years.

Effects of Different Factors on the Performance of Recycled Aggregate Permeable Pavement Concrete.

Urban construction has produced a large amount of construction waste which has caused huge environmental problems. The sponge city is the development direction of urban construction, and permeable pavement concrete is an important material for sponge city construction. To see the law influencing different factors on the performance of recycled aggregate permeable pavement concrete, different water binder ratios, recycled aggregate particle gradations, ordinary aggregate substitution rates, and fly ash and admixture contents are designed to prepare permeable concrete.

The promotion effect of π-π interactions in Pd NPs catalysed selective hydrogenation.

The utilization of weak interactions to improve the catalytic performance of supported metal catalysts is an important strategy for catalysts design, but still remains a big challenge. In this work, the weak interactions nearby the Pd nanoparticles (NPs) are finely tuned by using a series of imine-linked covalent organic frameworks (COFs) with different conjugation skeletons. The Pd NPs embedded in pyrene-COF are ca.

A fluorometric and colorimetric dual-signal nanoplatform for ultrasensitive visual monitoring of the activity of alkaline phosphatase.

Considering the limited sensitivity and accuracy of single-signal assay strategies, the multi-signal assay strategy has sparked significant excitement in recent years. In this study, for the first time, we reported a one-pot method in situ synthesis of carbon-containing nanoparticles (CNPs) via p-aminophenol (AP) and diethylenetriamine (DETA). The CNP solution exhibits yellow and light blue fluorescence under UV-light.

Preparation and characterization of Ag-loaded SmVO4 for photocatalysis application.

Ag/SmVO4 composite photocatalysts were synthesized and characterized by BET, XRD, Raman, SEM, TEM, XPS and DRS techniques. Their photocatalytic activities were determined by oxidative decomposition of RhB in aqueous solution under visible light irradiation. The charge separation efficiency was evaluated by the photocurrent-time and ֹOH-trapping experiments.

In situ real-time diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) study of hydrogen adsorption and desorption on Ir/SiO2 catalyst.

The adsorption and desorption of hydrogen on Ir/SiO(2) catalyst were studied by using in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) combined with curve-fitting analysis. The results indicate that there are three different surface species formed on the catalyst that correspond to the peaks at 1950, 2010, and 2035 cm(-1), respectively, when exposed in H(2) flow at 130 °C. These surface species display different adsorption and desorption trends.

Hydrogen fluoride adsorption and reaction on the α-Al2O3(0001) surface: a density functional theory study.

The adsorption and reaction behaviors of HF on the α-Al(2)O(3)(0001) surface are systematically investigated using density functional theory method. By increasing the number of HF molecules in a p(2 × 1) α-Al(2)O(3)(0001) slab, we find that HF is chemically dissociated at low coverage; while both physical and dissociative adsorption occurs at a 3/2 monolayer (ML) coverage. At the same coverage (1.

A DFT study of the structures of Au(x) clusters on a CeO2(111) surface.

Studying the structures of metal clusters on oxide supports is challenging due to their various structural possibilities. In the present work, a simple rule in which the number of Au atoms in different layers of Au(x) clusters is changed successively is used to systematically investigate the structures of Au(x) (x=1-10) clusters on stoichiometric and partially reduced CeO(2)(111) surface by DFT calculations. The calculations indicate that the adsorption energy of a single Au atom on the surface, the surface structure, as well as the Au-Au bond strength and arrangement play the key roles in determining Au(x) structures on CeO(2)(111).

Study of defect sites in Ce1-xMxO2-δ (x = 0.2) solid solutions using Raman spectroscopy.

A series of Ce(1-x)M(x)O(2-δ) (M = Gd, Zr, La, Sm, Y, Lu, and Pr) samples were characterized by Raman spectroscopy to investigate the evolution of defect sites (oxygen vacancies and MO(8)-type complex) and their distributions in the samples. It was found that the evolution of oxygen vacancies was due to the different ionic valence state of dopant from that of Ce(4+), while the evolution of the MO(8)-type complex was due to the different ionic radius of dopant from that of Ce(4+). The distributions of defect sites were investigated using 325 and 514 nm excitation laser lines, indicating that the defect sites were surface enriched.

UV and visible Raman studies of oxygen vacancies in rare-earth-doped ceria.

Surface properties of rare-earth (RE) doped ceria (RE = Sm, Gd, Pr, and Tb) were investigated by UV (325 nm) and visible (514, 633, and 785 nm) Raman spectroscopy, combined with UV-vis diffuse reflectance spectroscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectra techniques. It was found that the optical absorption property of samples, the wavelength of detecting laser line, and the inhomogeneous distribution of the dopants significantly affected the obtained surface information, namely, the peak intensity and shape at ca. 460 and 570 cm(-1), as well as the observed oxygen vacancy concentration (A(570)/A(460)).

Effect of optical absorbance on the Raman spectra of Ce(0.9)Tb(0.1)O(2-delta) solid solution.

Concentration of oxygen vacancies, optical absorption and microstructure of Ce(0.9)Tb(0.1)O(2-) (delta) material under different atmospheres (O(2), He and H(2)) and temperatures are characterized by in situ X-ray diffraction, in situ Raman spectroscopy and confocal microscopy.

[XRD and Raman spectroscopic comparative study on phase transformation of gamma-Al2O3 at high temperature].

The phase transformation of gamma-Al2O3 at high temperature was characterized by XRD and Raman techniques. Raman results show that under the excitation at 632.8 nm, the Raman shift bands at 1175 and 1241 cm(-1) and the other two bands at 1370 and 1 400 cm(-1) are attributed to the Cr3+ and (or) Fe3+ fluorescence bands in theta-Al2 03 and alpha-Al2O3 environments respectively.

Fabrication of zeolite-4A membranes on a catalyst particle level.

Zeolite-4A membranes are coated onto spherical Pt/gamma-Al2O3 particles with an average diameter of 1.5 mm, and a model oxidation reaction of a mixture of CO and n-butane (50 : 50) is used to demonstrate the concept of reactant selectivity via the coated defect-free membranes.

Raman spectroscopic study on the structure in the surface and the bulk shell of Ce(x)Pr(1-x)O(2-delta) mixed oxides.

The difference between the surface and the bulk shell of Ce(x)Pr(1-x)O(2-delta) mixed oxides was studied by Raman spectroscopy with four different excitation lasers. Two Raman peaks appear at 465 and 570 cm(-1) under all of the four lasers. The former is attributed to the Raman active F(2g) mode of CeO2, while the latter is attributed to oxygen vacancy.