Qing Shan Pan

Determination of Parathion in Water Sample Using Ionic Liquid Head Space Microextraction Followed by HPLC

In this study, a simple and effective method for the determination of organic phosphorus in environmental water samples using ionic liquid (1-butyl-3-methyl-imidazolium hexafluorophosphate, BmimPF6) head space fiber liquid-phase microextraction combined with high-performance liquid chromatography (HPLC) has been developed. The effects on the extracting efficiency such as the pH of the sample solution, the concentration of NaCl, etc., were investigated. Under optimized conditions, the value of the extracting efficiency can reach 289 for parathion.

Study on the Adsorption Effect of ZnCl2-Modified Pomelo Peel Powder on Wastewater Containing Pb (II)

The modified pomelo peel powder was prepared by using chemical modification methods of ZnCl2 soaking and heating.The removal rate of Pb (II) ion in simulation of wastewater by the modified pomelo peel powder was tested. The effects of pH of wastewater, initial concentrations of Pb (II) ion, adsorbent dosage,temperature and time on adsorption of Pb (II) ion was studied. Results show that when Pb (II) ion initial concentration at 100 mgL-1, pH of wastewater at 3.5-5.5, adsorption time at 100min, adsorbent dosage at 15gL-1, temperature at 35°C, the removal rate of Pb (II) ion in simulation of wastewater by the modified pomelo peel powder was more than 95%.

Hydrothermal-Based Synthesis of CdS/ZnO Quantum Dots

In this article, the CdS and CdS/ZnO quantum dots (QDs) were prepared by hydrothermal synthesis method. The optimal reaction conditions of CdS/ZnO QDs were obtained through experiment as follows: the pH value of solution is 10.0, the reaction temperature is 140 °C and reaction time is 24 h. While the pH value is up to10.0, Zinc ion exist in solution with Zn (OH)2 and Zn (OH)42-, which is apt to adsorb on the surface of CdS, and form to ZnO shell under the hydrothermal condition, so CdS/ZnO QDs are synthesized successfully. The photographic images and fluorescence emission spectra results showed that the colour and the peak position of fluorescence spectra of CdS/ZnO QDs is consistent with literatures, which confirming the feasibility of this method.

Degradation of Phenol by Fe3+ Doped Nano-TiO2 Photocatalyst

Degradation properties of phenol using nano-TiO2 as photocatalyst in aqueous solution were investigated. The effect of annealing temperature and ionic modification on the degradation was studied. The results showed that, 500 °C annealed TiO2 was better than 700 °C annealed. Photocatalyst nano-TiO2 material doped with Fe3+ was prepared quickly by sol-gel process and was used as photocatalyst to degrade phenol solution of 100mg/L under UV irradiation for 3 hours. UV spectrophotometer testing was made and found that two peaks at 210 nm and 270 nm were significantly become low, indicating that the phenol has been degraded. The phenol degradation rate was 94.18%.

Preconcentration of Arsenic in Radix aucklandiae by Sulfhydryl Cotton and Determination by Atomic Fluorescence Spectrometry

Using sulfhydryl cotton for preconcentration of arsenic in Radix aucklandiae and determination of the arsenic by hydride generation-atomic fluorescence spectrometry. The samples were pretreated by high pressure digest. The experimental conditions such as negative high-voltage of instrument, preconcentration conditions and separation conditions of arsenic were studied and optimized. There was a good linear relationship between the fluorescence intensity and arsenic concentration in the range of 0-10μg/L with a correlation coefficient of 0.9997, while the detection limits was 0.06μg/L, and the relative standard deviation was 1.7% .The content of arsenic in the samples was 68.9-252.3µg/kg and the recovery was 90.0-95.0%.

Preparation of Modified Corncobs by Citric Acid and Study on the Adsorption of Cr (VI)

The modified corncobs was prepared by using citric acid. Conditions of preparation, the effects of pH, initial concentrations of Cr (VI) and adsorption time to adsorption of Cr (VI) was studied. Results show that when citric acid concentration at 3molL-1, heating treatment temperature at 160°C, the treatment time at 2h, the modified corncobs had a high adsorption of Cr (VI). At room temperature, Cr (VI) initial concentration at 10 mgL-1, medium aqueous solution pH at 2.5, adsorption time at 150min, the absorption rate of modified corncobs for Cr (VI) was 96.13%, higher than absorption rate of ordinary corncobs for 22.83%.

Effects of Cobalt Chloride on Determination of Cadmium in Radix aucklandiae by Hydride Generation-Atomic Fluorescence Spectrometry

The cadmium in the Radix aucklandiae was determined by hydride generation-atomic fluorescence spectrometry after the Radix aucklandiae was treated by high pressure digestion. The effect of cobalt chloride to determination of cadmium by atomic fluorescence spectrometry was studied in this paper. The linear relationship was best when the concentration of cadmium standard solution at 0-10ug/L. The linear equation of standard curve was If=290.50×C+19.06. R= 0.9996,while the detection limits was 0.49ng/L,with a relative standard deviation of 0.37% .The cadmium content in the Radix aucklandiae was 56.8-72.3µg/kg with a recovery range of 81.6%-87.2%.

Adsorption of Cadmium (II) from Aqueous Solutions by Peanut Shell Cellulose Modified with Carbon Disulphide

Peanut shell Cellulose Xanthate (PCX) was prepared by reacting with carbon disulphide after mercerized by sodium hydroxide solution. The preparing conditions (hydroxide solution concentration, carbon disulphide dosage, temperature) were optimized in this study. And the effects of PCX amount and contact time on the removal of Cd (II) ion from aqueous solution was studied,the results indicated that when the initial Cd (II) ion concentration was 10mg/L, the adsorption capacity of PXC was high effective with the PCX amount was 1g/L and the contact time was 1.5h,the equilibrium adsorption capacity of PCX was 9.87 mg/g and the removal rate of Cd (II) ion was 98.72%.Then the regeneration capacities of PCX adsorbent was investigated, the results indicated that the removal rate of Cd (II) ion was more than 75% after regeneration. All the results indicated that the PCX can be used as a low cost but effective biosorbent for heavy metals remediation.

Study on the Properties of Carboxyl Functionalized Kapok Fiber on Adsorption of Mercury (II)

Modified kapok fiber (MKF) was prepared by reacting with succinic anhydride after microwave pretreatment. The preparing conditions (microwave power and pretreatment time) were optimized in this study. And the effects of MKF dosage, PH and contact time on the removal of Hg (II) ion from aqueous solution was studied, the results indicated that when the initial Hg (II) ion concentration was 100mg/L, the adsorption capacity of MKF was high effective with the MKF dose was 5g/L , PH was 4.0 and the contact time was 2h,the equilibrium adsorption capacity of MKF was 19.21 mg/g and the removal rate of Hg (II) ion was 97.13%. All the results indicated that the MKF was a effective adsorbent for removal of Hg (II) ion.

Docking Studies on a Series of Novel Potent BRAF Inhibitors

BRAF, a serine/threonine specific protein kinase that is part of the MAPK pathway and acts as a downstream effector of RAS, is a potential therapeutic target in melanoma. We have studied a series of small-molecule BRAF inhibitors based on a 1H-imidazo[4,5-b]pyridine-2(3H)-one scaffold (ring A) as the hinge binding moiety and a number of substituted phenyl rings C that interact with the allosteric binding site. Based on molecular docking obtained by using GOLD, the interaction models on the receptor site of BRAF are guiding the design of potential inhibitory structures directed against BRAF activity.