4 research outputs found
Performance evaluation of Fe (III) adsorption onto brewers’ spent grain
This work investigated the performance of locally available brewer’s spent grain (BSG) as an adsorbent for the removal of Fe (III) from aqueous solution. The brewer’s spent grain (BSG) was collected, processed and characterized using scanning electron microscope (SEM) and X-ray fluorescence (XRF) to assess its potential for the removal of Fe (III). Thereafter, batch adsorption technique was employed to evaluate the effects of adsorption variables such as pH, initial metal ion concentration, adsorbent dosage and contact time on the sorption efficiency of BSG. The maximum adsorption time was fixed at 120minutes with a stirring speed of 100rpm. Experimental data obtained were then analyzed using selected isotherms and kinetic models such as Langmuir isotherm, Freundlich isotherm, Pseudo-First order and Pseudo-Second order kinetic models. SEM result revealed the presence of microporous structure within the surface of BSG thus making it a good candidate for metal ion removal. Based on the linear coefficient of determination (r2), it was observed that the experimental data fitted well with the Langmuir isotherm model (r2 = 0.9940 for raw BSG and 0.9946 for the treated BSG). In addition, the reaction mechanism that accompanies the adsorption of Fe (III) unto BSG was best described by the pseudo-second order kinetic model (r2 = 0.9823 for raw BSG and 0.981 for the treated BSG). Finally, maximum adsorption efficiencies of 66% and 77% were obtained for both the raw and treated BSG for optimum adsorption time of 120 minutes, pH 8.0 and adsorbent dose of 1.0g/50ml solution. http://dx.doi.org/10.4314/njt.v35i4.3
Geospatial Analysis of Vehicular Emissions in some Parts of Benin City, Nigeria
Decline in air quality over the years has been linked to the growing
rate of urbanization and the increase in the number of vehicles plying
the roads. The focus of this study is to monitor the incidence of
vehicular emissions in some parts of Benin City and employ
geostatistical techniques such as kriging interpolation to study the
spatial distribution of some selected pollutants around the study area.
Seven (7) georeferenced points, namely; University of Benin Main Gate,
Ekosodin junction, Agen Junction, Super D junction, Nitel junction,
Okhunmwun junction and Oluku Market junction were used for data
collection. Pollutant from vehicular emission, namely; dinitrogen oxide
(NO2), carbon monoxide (CO) including the total radiation were
monitored in the morning and evening for a period of 35 days (7th July
to 12th August 2020) with the aid of portable toxic gas monitors and
radiation alert meters. Other parameters of interest which were also
measured include; maximum temperature and wind speed using infra-red
thermometers and portable anemometer. To ascertain the quality of the
data, selected preliminary analysis, namely; test of normality, test of
homogeneity, outlier detection and reliability test were done. Results
of the study revealed a growing concentration of CO and NO2 around
Ugbowo maingate and Okhunmwun community especially during the peak
hours