Advanced Materials Research Vols. 864-867

Abstract: Life cycle analysis combined with technical economic evaluation method in the paper to control the cost of denitration. A simple model for denitration cost is developed. The influence of different flue gas concentration of NOx to the cost of unit denitration is analysed by life cycle analysis, includes construction, operation and decommissioning, which based on 600 MW coal-fired units. Preliminary calculations reveal that comparing with directly using the denitration technology of selective catalytic reduction (SCR), after using Air staged Low NOx Combustion Technology reduced NOx below 400mg/m³, using SCR denitration further decreased the concentration of NOx in flue gas to 100mg/m3 can save more than 44% of the general denitration cost. This can improve effectively the environmental protection and economy of the coal-fired unit.

Abstract: A facile and reproducible method for the synthesis of Ag3PO4/AlPO4-5 photocatalyst has been developed to improve the photocatalytic activity of Ag3PO4. The innovation of this method is to in situ deposit Ag3PO4 nanoparticles onto the AlPO4-5 surface forming a composite photocatalyst. The improved activity of the Ag3PO4/AlPO4-5 composite photocatalyst for the degradation of rhodamine B (RhB) under visible light irradiation is attributed to the increased surface area and the enhanced absorption of RhB.

Abstract: MCM-41 supported nickel phosphide (Ni₂P/MCM-41) was prepared by temperature-programmed reduction of the corresponding phosphate. The catalyst activity for hydrodeoxygenation (HDO), hydrodearomatization (HDA), hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) was investigated in a fixed bed reactor. O-cresol HDO, 1-methylnaphthalene HDA, quinoline HDN, dibenzothiophene HDS and simultaneous HDO, HDA, HDN, HDS were respectively tested at different temperatures with constant pressure (6.0 MPa), liquid hourly space velocity (3.0 h^-1), hydrogen-to-oil volume ratio (600:1). The results indicate that Ni₂P /MCM-41 catalyst has great performance on HDO, HDA, HDN, HDS in single model compound reactions. O-cresol and DBT are almost completely transformed at 375°C, while 1-methylnaphthalene and quinoline reach the highest conversion at 300°C. In the simultaneous reactions, quinoline shows higher conversion by competitive adsorption on the catalyst hydrogenation sites, leading to conversion decrease of o-cresol, 1-methylnaphthalene and DBT.

Abstract: In this work, organic contaminants rhodamine B dyes in aqueous solution were decomposed by Ag₃PO₄ even without the lamp irradiation. This new photocatalytic system was established , in which Ag₃PO₄ could harvest persistent phosphorescence from SrAl₂O₄:(Eu,Dy). Such a self-luminescence-assisted process could enhance the performance of photocatalysts for environmental cleanup.

Abstract: A strain of Fe(II)-dependent autotrophic denitrification bacteria, named W1, was isolated from the sediment of the East Lake in Wuhan and was identified as Pseudomonas sp.. The denitrification performance of W1 under different conditions was investigated in this study. The results indicated that the optimal condition for W1 to remove nitrate was: NO3--N 50 mg·L-1, Fe2+ 500 mg·L-1, and pH 6.8-7.0. After one week’s cultivation under optimal condition, denitrification efficiency of W1 could reach 87.54%. During the process of cultivation, the nitrite concentration was always no more than 0.33 mg·L-1 and there was no ammonia production. It seems that the nitrate was almost converted into N2.

Abstract: Fe³⁺ doped Bi₂MoO₆ photocatalyst was successfully synthesized via a hydrothermal process using Bi (NO₃)₃ and (NH₄)₆ Mo₇O₂₄4H₂O as starting materials. XRD, SEM and UV-Vis absorption spectrum techniques were employed to characterize the phase composition and spectrum properties of the as-synthesized samples. Salicylic acid was selected as a model pollutant to investigate the effect Fe³⁺ doping on the photocatalytic activity of as-synthesized Bi₂MoO₆. The experimental results indicated that Fe³⁺ element doping can enhance the photocatalytic activity of Bi₂MoO₆ photocatalyst. When the amount of Fe³⁺ doped in Bi₂MoO₆ is 0.5%, the photocatalyst exhibits the best photocatalytica activity. The doped Fe³⁺ doped into the crystal lattice of Bi₂MoO₆ photocatalyst act as the electron traps and facilitates the separation of the separation of photogenerated electron-hole pairs due to its electron deficient. Thus, Fe³⁺ doping improve the photocatalytic with great efficiency.

Abstract: Performance evaluation of three scale and corrosion inhibitors in simulated cooling water according to generating set in a power plant was presented in this paper. The scale and corrosion inhibition performance of the inhibitors were conducted by the methods of the static scale inhibition and rotary coupon tests respectively. The results indicated that 316L stainless steel has low uniform corrosion rate ranging from 0.0042 to 0.0048 mm/a in the simulated cooling water both with and without inhibitors. The drops of hardness in water with No.1 and No.3 inhibitors were slight, and these two inhibitors were of good scale inhibition while No.2 was poor. Keywords: simulated cooling water; scale inhibition; corrosion inhibition; performance evaluation; 316L stainless steel.

Abstract: To determine the the fiber fineness in different parts of the old and young leaves. the pineapple leaf fiber of smooth cayenne was used as raw material, The results showed that, the length of fiber extracted from the old leaves of smooth cayenne pineapple ranged from 80 cm to 100 cm, and the average fiber fineness of the the tip and root were 14.40 dtex and 18.53 dtex, respectively. While the length of fiber extracted from the young leaves of smooth cayenne pineapple ranged from 50 cm to 70 cm, and the average fiber fineness of the the tip and root were 13.27 dtex and 14.77 dtex, respectively. Variance analysis reveals that the fiber fineness of root and tip in the old pineapple leaf showed significant difference (P<0.05) in smooth cayenne pineapple.

Abstract: Nanofiltration membranes act an important role in the advanced water treatment as well as waste water reclamation and other industrial separations. Therefore, an understanding of the factors affecting NF separation and membrane fouling in high-pressure membrane systems is needed. Recent studies have shown that membrane surface morphology and structure as well as surface chemical characteristics influence permeability, rejection, and fouling behavior of nanofiltration (NF) membranes. A comprehensive literature review is reported, targeting the physical-chemical characteristics of NF membrane affecting separation and fouling, including pore size, porosity, surface morphology (measured as roughness), surface charge, and hydrophobicity/ hydrophilicity.

Abstract: The absorbing kinetic process of methyl on Si (111) surface was comprehensively studied using the method of quantum mechanics. We optimized the model structures of radical CH₃⁺, Si (111), and CH₃⁺ on Si (111) to obtain a rational convergence for the present calculations. The electron density difference and density of states of each model were calculated by CASTEP. The electron density difference of CH₃⁺ on Si (111) reveals that the charge transfer factor is difference for different absorption positions, which indicates that the bond strength difference. The density of state of model exhibits that the electronic peaks move to the low energy direction. However, the absorption on B (-8.57, -2.19, 0.91) position shows a higher electron shift which evidences that it is the appreciating absorption position.