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In this paper, the degradation of 2,4,6-trichlorophenol (TCP) by hydrogen peroxide catalyzed by nano-iron was studied. Nano-iron was obtained through chemical reduction of FeSO4·7H2O and KBH4. The influences of pH, the concentration of H2O2, temperature, ionic strength and the amount of nano-iron on the degradation of TCP were investigated. The result showed that under the optimized condition, more...
Molecular imprinting, a templated polymerization technique, is a promising method to prepare a functional polymeric network for targeted binding of molecules in a selective recognition process. In this work, a silica-based (polysiloxane) polymer was utilized in a sol-gel process to fabricate a molecularly imprinted polymer (MIP). The manufactured MIP was imprinted with a template molecule, lysozyme...
A calculation method combining a simple energy balance model and CFD simulation is proposed in this paper to study the thermal effects on pollutant dispersion in real street canyons. The surface temperature calculated by the independent energy balance model can be used as thermal boundary by CFD simulation. Using the combination calculation method, the wind flow and pollutant transport inside an idealized...
A number of activated carbons had been produced from waste tires by pyrolysis and water activation methods, and they had been modified by sulfur steam at high temperature. Produced sulfur-impregnated activated carbons were examined for their mercuric chloride adsorptive ability by thermal gravimetric analysis. The experiment data show that sulfur should be evenly distributed in the activated carbon...
In this paper, a novel large size (50x50 mm2) anodic porous alumina membrane specially used in hemodialysis process is developed. By using a two-step anodization fabrication method, a semi-permeable membrane with nano-sized pores is produced. Comparing with spongy style pores located on polymer membranes, this membrane has straight channel pores. And these pores are uniform in size. Experimental results...
In order to study the distribution and the origin of Cr and Ni in the shallow groundwater in Yongqiao area along Kuihe River, we sampled the shallow groundwater from the both sides of the Kuihe Rive in Yongqiao area of Suzhou Anhui province, China. The results showed that a large area of the shallow groundwater was polluted by heavy metals in this region. Along the river direction, Cr concentrations...
Response surface method (RSM) is a set of mathematical and statistical methods for experimental design and evaluating the effects of variables and searching optimum conditions of variables to predict targeted responses. Oestrone (E1) is one of the most important steroid estrogens in sewage and waterbody. An internal standard method of HPLC-MS-MS for E1 is established with its operational parameters...
In this study, the kinetic mecha-nisms for the hydration process of calcium phosphate cement (CPC) containing chitosan in its liquid phase were investigated by X-ray diffraction quantitative analysis. The powder component consisted of an equimolar mixture of tetracalcium phosphate and dicalcium phosphate anhydrous. The liquid component consisted of chitosan (3 wt%), citric acid (5 wt%) and glucose...
Cytokinesis B serves as a backup mechanism in some mammalian cells after cytokinesis A failure. However, its mechanism remained poorly understood. Here, we applied cytochalasin D, an known actin inhibitor, globally during cytokinesis of NRK cells or cells dividing using cytokinesis B. Different from large fan-shaped lamellipodia at the leading edge during cytokinesis B, the progression of cytokinesis...
Constructed wetlands (CWs) have proven to be a promising treatment alternative for developing countries. Recently attention has been focused on the ability of CWs to reduce human pathogens in wastewater. In this study, indicator microorganisms (Escherichia coli) and pathogens (Salmonellae) were analyzed from a full-scale surface flow constructed wetland situated in China. The results showed that for...
Abstract-the article intends to introduce the authors' experimental study on adsorption behaviour of chitosan solution on silica by reflectometry. Effect of pH on adsorption of Chitosan and interaction with non-ionic surfactant on silica has been studied. The adsorbed amount Γ was 0.80, 0.35 mg·m-2 at pH6.8 and 6.0, respectively. Zeta potential measurements have been measured in the experiment. Exchanges...
The sludge carbon made from sewage sludge with ZnCl2 are used for gatifloxacin adsorption. Characterizing sludge carbon and researching mechanism of gatifloxacin adsorption on different adsorbents. The results showed: sludge carbon have large surface area and mid-hole structure. The adsorption keep to second kinetics model, that means chemical adsorption is the main progress. The research proves sludge...
The surface structure of mature egg and change of fertilization envelope in embryonic development had studied in the Sheatfish (Silurus soldatovi). The surface of the mature egg envelope was very thin and adhesive when came into contact with water. The observation in SEM showed that the surface of the mature egg was covered by a membrane which was composed by thickness materials with even electron...
Batch experiments were conducted to investigate the kinetics of uranyl removal by zerovalent iron (ZVI) as well as the impact of environmental factors on this process. The result suggests that the aqueous uranyl cations can be reductively removed by ZVI. The uranyl immobilization was little affected by reaction temperature, indicating that this process was a chemical-controlled reaction mediated by...
The research objectives of the study are to manufacture nano-TiO2 with doping Fe3+, Ce3+ and La3+ adopting impregnation method, examine the effects of the preparing condition on catalyst performance, and explore the influence of the adding account of metal ions and different ion-combinations on the photocatalytic activity of modified nano-TiO2. The experiment results support the following three conclusions...
The influence of rhamnolipid on the emulsification and the biodegradation of diesel oil contaminated wastewater were investigated in this paper. It was found that the addition of rhamnolipid influenced positively the emulsification and the biodegradation efficiency of diesel oil contaminated wastewater. And the effect of rhamnolipid on parameters of lipopolysachharide (LPS) release, cell surface hydrophobicity...
In addition to the less active metallic nickel, a new strategy was employed to enhance the activity of nano-Fe0 for the nitrate reduction. A novel carbon material called expanded graphite was employed to act as the support of bimetallic Ni/Fe. Through a synthesis procedure that includes consecutive steps of an incipient wetness impregnation method, heat treatment, borohydride reduction, a series of...
Wetland is an important regulator of water quality, which has great potential for purifying water pollutants. This paper proposes two methods to estimate water quality purification capacity: the single-factor water quality purification rate and the comprehensive water quality purification rate. It takes the area, from Long'an Bridge to Zhaosanliangzi which lies at the end of Zhongyin main channel...
The effect of powdered activated carbon (PAC) on the hybrid PAC/UF (PAC applied in combination with the ultrafiltration membrane) system was investigated in this paper. Compared to UF system, in which no PAC was added, the membrane flux was improved from 58.58% to 69.59% in terms of J/J0 value for 200 minutes' filtration. In PAC/UF process, it is the fraction which cannot be adsorbed by PAC takes...
Iron coated zeolite is made and its adsorption characteristics are compared with activated alumina and zero-valent iron to get further understand of the new adsorbent. The results show that iron coated zeolite removes As(V) in the similar with that by activated alumina with removal rate of 50% in first 5min's adsorption but slower after 60 mins' adsorption and faster than that by zero-valent iron...
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