Advanced Materials Research Vol. 830

Abstract: p-Carboxyarsenazo (CASA) color reagent was synthesized by simple diazotization reaction, and the chromomeric reaction between CASA with Cu(Ⅱ) has been studied by spectrophotometry. In pH=4.6 NaAc-HAc buffer solution, Cu(Ⅱ) reacted with CASA to form a red complex and exhibits an absorption maximum at 614 nm, Beer’s law is obeyed for 0-160 μg/L of copper in solution, the apparent molar absorptivity obtained is 1.57×104 L/(mol.cm), and the relative standard deviation (R.S.D.) is 1.6%. The proposed method exhibited high sensitivity and selectivity for Cu(Ⅱ). The results obtained by this method in the determination of environment water samples were accurate, sensitive and repeatable

Abstract: Carboxyl-modified graphene materials in both oxide and reduced state were explored in parallel for the preparation of field-effect transistors (FET). They were solution gated by phosphate buffer solution (PBS) (pH 7.2). Their conductance were examined and compared with unmodified graphene transistors, firstly. Then, after single strand DNA molecules were immobilized on reduced and oxide graphene transistors, their conductance and compared. Here ssDNA molecules were amino-tagged at the terminal five. It was found that ambipolar characteristic was exhibited by reduced graphene transistors, even they were undergone carboxyl modification. And it was also discovered that there were opposite conductance variation with the increasing of ssDNA concentrations and bigger changes were obtained by reduced carboxyl-modified graphene transistors.

Abstract: MTO is the core technology of the coal-to-olefins process. Vinyl methyl ether was added to the reaction feed to investigate the infulence of methoxy group concentration in MTO reaction. Several series of metal-modified ZSM-5 were synthesized to investigate the effect of metal element in the progress methoxy group involved. The reaction results indicated that both the addition of vinyl methyl ether and the metal modification on catalyst led to an increase in C2~C3 olefins yield. The highest C2~C3 olefins yield was obtained using methanol with 5wt% vinyl methyl ether as feed and ZSM-5 with 3wt% Ba modified as catalyst.

Abstract: A chemiluminescence enzyme-linked immunosorbent assay (CL-ELISA) was developed for the detection of Sudan I in food products. The CL-ELISA conditions, such as the concentration of antigen, antibody and goat anti-mouse IgG-HRP, were optimized. The optimized CL-ELISA allowed the Sudan I detection in a linear range of 0.625-10 ng mL^-1, the IC₅₀ was 3.3ng mL^-1 and the limit of detection (LOD) was 0.31 ng mL^-1. The method showed good recoveries with spiked chilli powder. The recovery rate in a batch range from 73-109.6%, and the recovery rate between the batch range from 78-109.24%. The proposed method proved to be efficient for the detection of Sudan I in food samples.

Abstract: The artificial antigen ciprofloxacin-bovine serum albumin (CPFX-BSA) and ciprofloxacin-ovalbumin (CPFX-OVA) were synthesized by carbodiimide (EDC) method and sodium periodate oxidation method, respectively. These two kinds of antigens were identified by the UV absorption method and the animal immunization test, which showed that they were synthesized successfully. The successful synthesis of ciprofloxacin artificial antigen is important to establish immunoassay of ciprofloxacin.

Abstract: A simple, environmentally friendly and fast method for the enrichment of parathion in water sample based on enhancement effect of room temperature ionic liquid (1-butyl-3-methyl imidazolium hexafluorophosphate, BmimPF₆) for hollow fiber membrane liquid phase microextraction followed with high performance liquid chromatography (HPLC) has been developed. The effects of the analytical conditions such as the extraction time, extraction temperature, the pH of the sample solution, etc., were studied. Under optimized conditions, the value of the extraction efficiency can reach 195 for parathion.

Abstract: Using composite zeolite filter material independent preparation in the laboratory as an aeration biological filter material,and compared with ceramsite.The ammonia-nitrogen adsorption capacity of the above two filters were evaluated through the pilot test. The start-up of pilot scale CBAF (BAF filled with compound filter material) showed that the average NH4+-N removal rate of the first 5 days was 52.36% when the average influent NH4+-N concentration was 37mg/L. In steady operation condition, the average NH4+-N removal rate reached 83.51% and the average effluent NH4+-N concentration was 5.81mg/L, which could meet the first degree of national wastewater discharge standard (GB 8978-1996).

Abstract: In order to improve the present situation of rural water source which need artificial control of the spot, decentralized management, design the project of the remote monitoring system based on LabVIEW. Realize device communication of the site through the RS485 bus, and then through a serial port server realize communication of Field devices and upper PC t through wireless LAN. Using NI Modbus user database programming of LabVIEW, implement the remote monitoring and controlling .System prove to be simple, reliable communication by way of practice, can basicly meet the requirements of remote monitoring water source. Keywords: remote monitoring ;LabVIEW;RS485

Abstract: In air flotation process, different gas produce different gas content of gas-soluble water. According to the difference of solubility of nitrogen and oxygen in water, the affect of the difference of molecule structures between nitrogen and oxygen on their solubility in water was discussed in the paper. Then, Two types of gas dissolution in water was introduced in the paper---gap filling and hydration. The concept of effective gap degree was proposed. And According to the effective gap degrees and hydration coefficient of nitrogen and oxygen, the change rules of the dissolved amount of oxygen and nitrogen by each type of dissolution at different temperature were obtained through a series of data fitting calculation by using Matlab. Finally, the reason for the change of the amount of gap filling and hydration in gas-soluble water caused by temperature change was also analyzed in the paper.

Abstract: This paper has introduced the principle and advantages of a new Permeability Plugging Apparatus(PPA) for drilling fluid working under high temperature and high pressure(HTHP). The domestic status and solution of PPA is also been analysed on properties of materials.