Advanced Materials Research Vols. 864-867

Abstract: Photocatalytic technology as a means of degradation of pollutants had been widespread concerned. In the past three decades, titanium dioxide (TiO₂) has become one of the most extensively studied metal oxides because of its excellent photocatalytic activity and photoinduced hydrophilicity ^[1, . But TiO₂ only absorbs wavelengths in the near-UV region (λ<400nm), which is about 3% of the solar spectrum and 53% visible light was can not efficiently utilized for the degradation of organic pollutants. Therefore, it is crucial to explore visible-light-induced photocatalysts. In recent years, in addition to traditional oxides, some complex oxides have been found under visible light driven have a good photocatalytic activity, Such as, N-doped TiO₂ ^[, BiOX (X=Cl, Br, I) ^[, Bi₂MoO₆ ^[ and so on. Nevertheless, such efforts have not achieved satisfactory results aspects of making full use of the visible-light. Therefore, it is still a great challenge to design efficient visible-light driven photocatalysts.

Abstract: Walnut shell was used as adsorbent to remove Cu2+ metal ions from the simulated aqueous solution. The influence of factors, namely: particle size, initial pH, oscillation intensity, adsorbent dosage and adsorption time were investigated through single factor experiments.The results show that, the adsorption capacity reached the peak for Cu2+ in 25°C when the initial pH was 5, particle size was 1.25~1.6mm, adsorbent dosage was2.5g, oscillation speed reached 200r/min, and the adsorption time was 360min, all above leads the removal rate of Cu2+reached 75.7%, and the adsorption capacity of Cu2+ 0.702 mg/g. The pseudo-second-order model was fitted to describe the adsorption of Cu2+ , it was shown that adsorption rate for the metal ions in proportion to the square of the concentration.The equilibrium concentration of adsorption fitted well with Langmuir isotherm equation, the process of adsorption was single molecular layer adsorption.

Abstract: This article focuses on the effects of pretreatment on sewage sludge with sodium hypochlorite addition. The solubilization of organic matters of sludge was investigated. It was found that the pypocholoride treatment provided a efficient process to release organics from sludge flocs. When the ClO^- dose was about 21mg /g SS with a reaction time of 3 hours, the supernatant soluble chemical oxygen demand (SCOD), total nitrogen (TN), total phosphorus (TP), protein and polysaccharide increased by 400%, 67%, 1791%, 635%, 214%, and 556%, respectively. After hypochlorite pretreatment, the sludge extracelluar polymers (EPS) were disintegrated and the cell walls were broken. Then the intracellular organic matters were released into the supernatant, leading to the increase of organic matters in the supernatant.

Abstract: The spilled oil alarming and tracking buoy system includes monitoring software and hardware, oil spillage sensor, and spilled oil alarming and tracking buoys. To buoy terminal directly after water, GPS positioning signal, and micro will be parsed real-time location information (position, speed, time, etc.) through wireless communication system (satellite networks or GSM network) to monitor the platform. Monitoring software can in electronic chart intuitive to display buoy, send the real-time controlled buoy updating, and change the transmission time interval.

Abstract: Cyclohexylamine, morphine, ethanolamine, propiolic alcohol, seventeen alkenyl amide ethyl imidazoline, water depolymerization malaya acid anhydride, etc were chosen as the raw material of corrosion scale inhibitor in view of corrosion scaling reason and characteristic of blast furnace top gas pressure recovery turbine unit. The optimized formula of corrosion inhibitor have been obtained through orthogonal experiment. Corrosion and scale inhibitor performance were evaluated respectively by static weight-loss method, dynamic weight-loss method and calcium carbonate deposition. The results show that when these components are reasonable distributed, the corrosion effect is satisfied. When water depolymerization malaya acid anhydride is combined with the corrosion inhibitor, the corrosion and scale inhibition efficiency of composite inhibitor are more than 90%. Simulation blast furnace gas is adopted in dynamic simulation experiment, the corrosion inhibition efficiency is over 92%.

Abstract: A major source of PM_2.5 is the combustion of coal-fired power plant, so its very necessary to monitor and control the emission of PM_2.5 form power plant. This paper summarizes the main emission control technologies of PM_2.5 for coal-fired plant. As the traditional electrostatic precipitators has low removal efficiency of submicron particles, so we improved the supply conditions of the precipitator, and pre-charged to improve the particle properties. Through this article, we know that using electric coagulation technology to control the particles form plant is practicable, and it has a good prospect for development.

Abstract: The significance of desulphurization and denitrification is more obvious in removal SO₂ and NO_x from flue gas emission during coal combustion. This paper summarized the latest progress of desulphurization and denitrification on wet, semi-dry, dry and microbiological purification, simultaneously. It is pointed out that the development and application prospects of simultaneous desulphurization and denitrification treatment have favorable.

Abstract: In this study PM2.5 and other five air pollutants (i.e. SO₂, NO₂, PM10, CO, and O₃) have been analyzed by using statistical methods. Two different regression models were established quantitatively in this paper to find out the factors and causes of PM2.5 and were compared by using the partial data from January 1 to August 26, 2013, which is obtained from Wuhan Environmental Protection Bureau. The results indicate that the correlation coefficients of PM2.5 and other four air pollutants CO, SO₂, NO₂, and PM10 are all over 0.7, which shows significant linear correlations, and regression models were proved illustrious and accurate by testing and contrast.

Abstract: In terms of energy and environmental purification, application of photocatalytic purification in energy and environment is getting increasingly widespread. In the present paper, it focused on the applications of photocatalytic technology in indoor air purification. Photocatalyst and photocatalytic reaction devices are the two issues in photocatalytic air purification. Fe-La co-doped TiO2 was prepared, and integration of photovoltaic-thermal circular photocatalytic air purification reactor was designed, which showed high air purification efficiency. The experimental data and theoretical analysis gave the support to exploit new indoor air purification technologies. Further, technical and economic analysis on photocatalysis technology with photovoltaic-thermal integration applying in indoor air purification was studied and helpful results were attained.

Abstract: Based on the principle of solid phase extraction and the purification method using Florida silica, sixteen various kinds of polycyclic aromatic hydrocarbons such as naphthalene, acenaphthene and fluorene were measured in Urumqi snow by means of HPLC. The results showed that the concentration of PAHs was different in different sampling sites in Urumqi. The total concentration of PAHs was in the range of 0.2883 ~ 8.814 µg/mL and the content of PAHs snow was higher than that in water, which indicated that the snow was polluted by organic matters to a certain degree and the pollution was not so serious compared with the groundwater. So the snow has a certain application value for life.