摘要：
Effect and benefits of a product or service could be analyzed and evaluated by life cycle assessment during the whole life cycle. Urban sewage treatment plants could improve and control urban water pollution escalating, but it also had certain harm to environment. Effect and benefits of urban wastewater treatment plant A and B were analyzed and evaluated, 13 factors were selected, and comprehensive benefits were researched quantificationally using the method of analytic hierarchy process. It found that urban wastewater treatment plant A who applied A/O process had better benefits than urban wastewater treatment plant B who applied BIOLAK process.
摘要：
A chicken eggshell membrane (ESM) was used as a solid-phase extraction adsorbent for the separation and preconcentration in combination with inductively coupled plasma-mass spectrometry (ICP-MS) for the determination of trace gold in geological samples. Gold (Au) was quantitatively separated and preconcentratcd in 1.2 mol L~(-1) HC1 at a sample flow rate of 2.0 mL min.~1 using the ESM microcolumn system. The gold adsorbed on the microcolumn was effectively eluted with a mixture of 1% thiourea and 0.12 mol L1 HCL The effects of acid concentration, sample flow rate and volume, eluent conditions and interfering ions were carefully investigated. The transition- and heavy-metal ions did not interfere with either the separation/preconcentration or the determination. The limit of detection of the method for Au was 0.92 ng L~(-1). The method was validated using certified reference materials and applied to the determination of trace Au in geological samples with satisfactory results.
摘要：
To improve the photocatalysis and absorbability of nanometer TiO2 particles, TiO2/MnO2 and TiO2/Mn3O4 composite particles in micrometer were prepared by template method. The morphologies and structure of the composite particles were characterized by SEM and XRD. The photocatalytic abilities and absorbability of alizarin red and methyl orange solution have been tested. The results show that the composite particles have excellent photocatalytic abilities and absorbability.
摘要：
The air–steam catalytic gasification of rice husk for hydrogen-rich gas production was experimentally investigated in a combined fixed bed reactor with the newly developed nano-NiO/γ-Al2O3 catalyst. A series of experiments have been performed to explore the effects of catalyst presence, catalytic reactor temperature, the equivalence ratio (ER), and steam to biomass ratio (S/B) on the composition and yield of gasification gases. The experiments demonstrated that the developed nano-NiO/γ-Al2O3 catalyst had a high activity of cracking tar and hydrocarbons, upgrading the gas quality, as well as yielding a high hydrogen production. Catalytic temperature was crucial for the overall gasification process, a higher temperature contributed to more hydrogen production and gas yield. Varying ER demonstrated complex effects on rice husk gasification and an optimal value of 0.22 was found in the present study. Compared with biomass catalytic gasification under air only, the introduction of steam improved the gas quality and yield. The steam/biomass ratio of 1.33 was found as the optimum operating condition in the air–steam catalytic gasification.
摘要：
The determination of chlorpyrifos at low ngL-1 levels in wastewater requires highly selective and sensitive analytical procedures. The removal of matrix components during sample preparation results in significant benefits towards reducing the matrix effects during GC analysis. Therefore this work describes a simple method to enrich and clean up chlorpyrifos from sewage water using molecularly imprinted solid phase extraction (MISPE). Final analysis was performed by gas chromatography. The performance of this method has been evaluated in water samples in terms of recovery, precision, and method quantification limit. Recovery for chlorpyrifos ranged between 99 and 105% with RSD values below 7.9%. The performance of the method was further emphasized by the study of different water samples. In these samples, chlorpyrifos were detected in concentration above method quantification limits ranging from 50 to 3000 ngL-1.
摘要：
A new method of removing chlorpyrifos from contaminated water using molecularly imprinted polymeric microspheres for chlorpyrifos is described. Molecularly imprinted polymeric microspheres were prepared by the emulsifier-free polymerization method. The removal efficiency and selective recognition ability of the molecularly imprinted polymeric microspheres were studied. The highest removal efficiency was observed at pH=7. Moreover, molecularly imprinted polymeric microspheres can be re-used for at least 10 times without losing any removal efficiency. Molecularly imprinted polymeric microspheres provided a selective, simple, reliable and practicable solution to remove chlorpyrifos from contaminated water.
