Search Results

You are looking at 1 - 3 of 3 items for

  • Author or Editor: Xian Hu x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

The photocatalytic properties of MoS2 samples including nano-ball, nano-slice and bulk 2H-MoS2 were evaluated and compared with that of the anatase TiO2 using the degradation reaction of methyl orange under visible light. The catalytic behaviors of the samples were also characterized using transmission electron microscopy, Brunauer-Emmett-Teller (BET) surface area, ultraviolet-visible spectroscopy, and FTIR spectroscopy. The results show that the bulk MoS2 and the anatase TiO2 were almost inactive under visible light. The nano-slice presented the most positive catalytic effect because it has a wide absorption at 400–700 nm and a high BET surface area. Though the BET surface area of the nano-ball was lower than that of the nano-slice, it has an active curved basal surface and presented a catalytic activity close to that of the nano-slice. Moreover, the MoS2 nano-slice catalyst could be conveniently regenerated after filtration and drying.

Restricted access

Abstract

A MoS2/AlOOH composite was synthesized by calcining the reaction product of Na2MoO4, Na2S, HCl and basic Al2O3. The obtained composite was characterized using thermal analysis, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, high-resolution transmission electron microscopy, ultraviolet–visible spectroscopy and infrared spectroscopy. The degradation reaction of methyl orange was used to evaluate the photocatalytic properties of the composite. The results showed that alumina existed in the form of AlOOH with the deposited nano-MoS2 on the surface. The composite contained an intensive absorption between 380 and 450 nm and presented excellent photocatalytic properties. In addition, the composite still retained a high catalytic activity after repeatedly used for three times. The catalytic activity of the composite was influenced by the initial concentration of methyl orange, the amount of the catalyst, the pH value, and the temperature. The composite was a promising photocatalyst for the removal of organic chemicals from wastewater.

Restricted access

Abstract

This study focused on developing an effective and environmentally friendly method to measure ligustrazine in rat serum by using polymer monolith micro-extraction (PMME) technique. A poly (methacrylic acid-ethylene glycol dimethacrylate) material was used to extract ligustrazine through hydrophobic and ion-exchange interaction. Qualitative and quantitative analysis was performed by a liquid chromatography and tandem mass spectrometry. After optimization of several PMME conditions, the developed method exhibited excellent extraction performance to the ligustrazine. Good linearity was acquired ranging from 10 to 2,000 ng mL−1, and the limit of detection of the proposed method was 0.14 ng mL−1. The recoveries measured by spiking three different concentrations in rat serum ranged from 82.6 to 95.3%, and excellent precision was found with relative standard deviations (RSDs) less than 8.3% for intra-day and 9.7% for inter-day, respectively. At last, the applicability of the method was further confirmed through continuous monitoring of ligustrazine in rat serum after dosing of ligustrazine tablets to rats.

Open access