Capturing Cu and recycling spent Cu-adsorbents as catalyst for eliminating Rhodamine B: reactivity and mechanism.

The thorny problem of adsorption is the disposing of spent adsorbent. In this manuscript, the exhaust adsorbent of efficient capture Cu(II) over ZSM-5 that supported zero-valent iron (nZVI) was reused as a catalyst for eliminating Rhodamine B (RhB). Batch experiments were used to evaluate the removal performance of Cu and RhB.

Enhanced Free-Radical Generation on MoS /Pt by Light and Water Vapor Co-Activation for Selective CO Detection with High Sensitivity.

Semiconductor-based gas sensors hold great promise for effective carbon monoxide (CO) detection. However, boosting sensor response and selectivity remains a key priority in moist conditions. In this study, a composite material, Pt quantum dots decorated MoS nanosheets (MoS /Pt), is developed as a highly sensitive material for CO detection when facilitated with visible light.

Extraction of alumina from high-alumina fly ash by ammonium sulfate: roasting kinetics and mechanism.

The recycling of aluminum is commonly an important step to achieve the high value-added utilization of fly ash, which is a kind of solid waste generated from coal-fired power plants. In this study, high-alumina fly ash was efficiently activated by ammonium sulfate method and the alumina was efficiently extracted. The effects of roasting temperature, roasting time, and ammonium sulfate/high-alumina fly ash mass ratio on the leaching rate of alumina were fully analyzed, and the roasting kinetics and reaction mechanism in the roasting process were discussed.

The nature of K-induced 2H and 1T'-MoS species and their phase transition behavior for the synthesis of methanethiol (CHSH).

The one-step reaction approach from syngas with hydrogen sulfide (CO/H/HS) over potassium (K) promoted Molybdenum disulfide (MoS) materials can provide alternatives for the synthesis of methanethiol (CHSH). However, the direct confirmation and determination of the real active nature of K-induced 2H and 1T'-MoS for this reaction and the corresponding phase transformation behavior and origin of K-induced 2H-MoS from/to 1T'-MoS remains unclear. Herein, we proved at the atomic level the precise position of K over 1T'-MoS and 2H-MoS species using the technique of HAADF-STEM.

Degradation of phenol by photocatalysis using TiO/montmorillonite composites under UV light.

Composites of titanium (IV) oxide combined with montmorillonite (MMT) with various TiO/MMT were prepared for photocatalysis application. The prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), diffuse reflectance UV-visible spectroscopy, and X-ray photoelectron spectroscopy (XPS). The main influential factors such as the TiO/MMT dose, calcined temperature, and pH value of the solution were studied.

Nanoarchitectonics of Ni/CeO Catalysts: The Effect of Pretreatment on the Low-Temperature Steam Reforming of Glycerol.

CeO nanosphere-supported nickel catalysts were prepared by the wetness impregnation method and employed for hydrogen production from glycerol steam reforming. The dried catalyst precursors were either reduced by H after thermal calcination or reduced by H directly without calcination. The catalysts that were reduced by H without calcination achieved a 95% glycerol conversion at a reaction temperature of only 475 °C, and the catalytic stability was up to 35 h.

Study of the Metal-Support Interaction and Electronic Effect Induced by Calcination Temperature Regulation and Their Effect on the Catalytic Performance of Glycerol Steam Reforming for Hydrogen Production.

Steam reforming of glycerol to produce hydrogen is considered to be the very promising strategy to generate clean and renewable energy. The incipient-wetness impregnation method was used to load Ni on the reducible carrier TiO (P25). In the process of catalyst preparation, the interaction and electronic effect between metal Ni and support TiO were adjusted by changing the calcination temperature, and then the activity and hydrogen production of glycerol steam reforming reaction (GSR) was explored.

MXene/WS hybrids for visible-light-activated NO sensing at room temperature.

Optoelectronic gas sensors based on two-dimensional (2D) materials are touted as potential candidates for NO sensing at room temperature. However, most of the developed optoelectronic sensors to date are confined to the ultraviolet region with unsatisfactory performance. Herein, a room-temperature visible-light-activated optoelectronic NO sensor based on 2D/2D TCT/WS nanocomposites is presented.

Flowing-Air-Induced Transformation to Promote the Dispersion of the CrO Catalyst for Propane Dehydrogenation.

Highly dispersed chromium (Cr)-based catalysts are promising candidates for the catalytic dehydrogenation of propane (DHP). However, the easier aggregation of Cr species into crystalline CrO at the high-temperature calcination and reaction process is a big challenge, which severely restricts the improvement of activity and stability of the DHP reaction. Herein, a flowing-air-induced transformation method was first proposed, and the catalytic performance of the prepared Cr/MCM-41 catalysts was found to be significantly improved compared to that of the Cr-based catalyst prepared by the traditional calcination method, even better than that of most of the reported Cr-based catalysts and some noble metal-based catalysts.

The identification of active chromium species to enhance catalytic behaviors of alumina-based catalysts for sulfur-containing VOC abatement.

As to the treatment of sulfur containing VOCs (examples are compounds of CHSH and CHSH), finding a catalyst with high performance is necessary. In this work, Cr-AlO (x = 1.0, 2.

Facile synthesis of amino-functional large-size mesoporous silica sphere and its application for Pb removal.

Amino-functional large-size mesoporous silica spheres (LMS-AP) were successfully synthesized through a one-step method with (3-aminopropyl) triethoxysilane (APTES) addition during the pseudomorphic transformation process. LMS-AP were characterized using thermogravimetry-differential thermal analysis, Nitrogen adsorption-desorption measurement, infrared spectroscopy, and X-ray photoelectron spectroscopy. The study found that -NH was grafted into LMS, and the LMS-AP had a better thermal stability than other samples.

Investigation of the reaction pathway for synthesizing methyl mercaptan (CHSH) from HS-containing syngas over K-Mo-type materials.

The reaction pathway for synthesizing methyl mercaptan (CHSH) using HS-containing syngas (CO/HS/H) as the reactant gas over SBA-15 supported K-Mo-based catalysts prepared by different impregnation sequences was investigated. The issue of the route to produce CHSH from CO/HS/H has been debated for a long time. In light of designed kinetic experiments together with thermodynamics analyses, the corresponding reaction pathways in synthesizing CHSH over K-Mo/SBA-15 were proposed.

Recycling Spent Cr Adsorbents as Catalyst for Eliminating Methylmercaptan.

Waste adsorbents generated from treating Cr(VI)-containing wastewater are hazardous materials and generally landfilled or treated by acid or base desorption, with concomitant high cost and toxic effects. The present work shows that these Cr adsorbents can be reused as highly efficient catalysts for treating sulfur-containing VOCs (CHSH), not only avoiding the economic and environmental impact from the conventional approaches, but also achieving the efficient treatment of sulfur-containing waste gas. Importantly, these reused Cr adsorbents exhibit enhanced activity and stability compared with the catalysts reported elsewhere, indicating a new avenue of green chemistry.

Investigating the Heavy Metal Adsorption of Mesoporous Silica Materials Prepared by Microwave Synthesis.

Mesoporous silica materials (MSMs) of the MCM-41 type were rapidly synthesized by microwave heating using silica fume as silica source and evaluated as adsorbents for the removal of Cu, Pb, and Cd from aqueous solutions. The effects of microwave heating times on the pore structure of the resulting MSMs were investigated as well as the effects of different acids which were employed to adjust the solution pH during the synthesis. The obtained MCM-41 samples were characterized by nitrogen adsorption-desorption analyses, X-ray powder diffraction, and transmission electron microscopy.

A novel and facile method to rapidly synthesize Ce0.8Zr0.2O2 nanoparticles for CO preferential oxidation in H2-rich stream.

A novel urea grind combustion (UGC) route was reported in this paper to rapidly prepare the ceria-zirconia nanoparticles (Ce0.8Zr0.2O2).

The optimization of As(V) removal over mesoporous alumina by using response surface methodology and adsorption mechanism.

The Box-Behnken Design of the response surface methodology was employed to optimize four most important adsorption parameters (initial arsenic concentration, pH, adsorption temperature and time) and to investigate the interactive effects of these variables on arsenic(V) adsorption capacity of mesoporous alumina (MA). According to analysis of variance (ANOVA) and response surface analyses, the experiment data were excellent fitted to the quadratic model, and the interactive influence of initial concentration and pH on As(V) adsorption capacity was highly significant. The predicted maximum adsorption capacity was about 39.

[AHP application to study of weighted coefficient on multicriteria optimization of extraction technology about Chinese traditional compound drugs].

Objective: Establishing a subjective and objective method to conform the weighted coefficient in multicriteria optimization of the extraction technology about Chinese traditional compound drugs.

Method: This article used analytic hierarchy process (AHP) to conform the weighted coefficient.

Result: Consistency checking result (CR < 0.