環境分析化学ジャーナル

A series of catalysts based on Fe/TiO2 were synthesized by template, impregnation, and co-precipitation methods for mid-temperature selective catalytic reduction of NO with NH3. The samples were characterized by Brunauer-Emmett- Teller (BET), X-ray diffraction (XRD), temperature programmed desorption (TPD) and Diffuse reflectance infrared Fourier transform spectra (DRIFTS). Among these catalysts, the sample prepared by template method exhibited the best catalytic performance. Analyses indicated that large specific surface area, good dispersion of active phase, and stronger NH4+ adsorption on Brønsted acid sites might be the main reasons for the high catalytic performance of Fe/TiO2 prepared by template method.

Population growth and increasing request of the consumer goods in urban centers represent certainly one of the causes at the base of the increase in the amount of waste. This is even more noticeable in Kinshasa, with its densely populated conurbations. This study aims to enhance the link (associations) between household excreta management mode and soil and children forme 2 to 10 years infestation. An analytical cross-sectional survey of 360 households was conducted in Kinshasa in order to determine helminth infections prevalence among targeted children and land plots. Willis flotation method and Ritchie enrichment were respectively used for soil and stool analysis. Chi-square test was used to detect a relationship or association with 0.05 significance level. Among surveyed households, 55.8% use latrines with effluents, including 34.5% evacuate their effluents either by cesspools or by using one or more hole (s) open (s) in plot and 29.9% by ditches. In addition, parasitic infestation prevalence of children from 2 to 10 years and land plots of Ngiri-Ngiri health zone is 61.2% and 44.8%, respectively. This land use is associated with poor management of household excreta, and is an important risk factor for infestation.