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Removal of methylene blue from aqueous solution by adsorption onto activated carbon prepared from animal bone and corncob - an agricultural waste

100%

Ezeugo J. N. O.

World News of Natural Sciences

2018

tom 19

Synthetic dyes are widely used in the rubber, textiles, plastics, paper and cosmetics industries to color their products. The effectiveness of adsorption for dye removal from wastewater has made it an ideal alternative to other expensive treatment methods. This study investigates the physicochemical properties of animal-bone- (AB) and corncob- (CC) derived activated carbon on the removal of methylene blue dye. The effects of condition variables such as initial dye concentration, adsorbent dose, pH and contact time were studied. The results show that animal-bone-derived activated carbon has better potential for dye removal than does the corn cob-derived equivalent. AB revealed a higher adsorption capacity of intensity (2.40) and is of higher surface area - 500 m2g –1, while CC has adsorptive capacity of 1.25, intensity of 2.80 and surface area of 420 m2/g–1. What is more, the removal efficiency increases as adsorbent dose increases. This makes it an interesting option for dye removal from aqueous solutions of dye.

Optimization of corrosion inhibition of Picralima nitida leaves extract as green corrosion inhibitor for zinc in 1.0 M HCl

51%

Ezeugo J. N. O., Onukwuli O. D., Omotioma M.

World News of Natural Sciences

2017

tom 15

Herein, the optimization of inhibitive action of the ethanol extract of oil from Picralima nitida leaves, towards acid corrosion of zinc, was tested using weight loss and thermometry methods. We found that the extract acts as a good corrosion inhibitor for zinc corrosion in 0.1 M HCl solutions. The inhibition action of the extract was discussed in view of Langmuir adsorption isotherm. This revealed that spontaneous processes govern the adsorption of the extract on zinc surface. Herein, the inhibition efficiency (IE) increases in line with corresponding increase in extract concentration. The temperature effect of the corrosion inhibition on the IE was also studied. This indicated that the presence of the extract increases the needed activation energy of the corrosion reaction. Furthermore, in our work, an optimal inhibition efficiency IE (%) of 86.78 was obtained at optimum inhibitor concentration of 1.2 gl-1, optimum temperature and time of 313 k and 8 hrs, respectively. From the calculated thermodynamic parameters, it can be said, then, that Picralima nitida extract provides good protection to zinc against pitting corrosion in chloride ion containing solutions.

Ograniczanie wyników

2 World News of Natural Sciences

2 Ezeugo J. N. O.

1 Omotioma M.

1 Onukwuli O. D.

1 2018

1 2017

Wyniki wyszukiwania

Removal of methylene blue from aqueous solution by adsorption onto activated carbon prepared from animal bone and corncob - an agricultural waste

Optimization of corrosion inhibition of Picralima nitida leaves extract as green corrosion inhibitor for zinc in 1.0 M HCl