naa a22 4500 510750206 CHVBK 20180411083101.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11270-013-1719-6 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1719-6 Chromium Removal from Modjo Tannery Wastewater Using Moringa stenopetala Seed Powder as an Adsorbent [Elektronische Daten] [Dagmawi Degefu, Mekibib Dawit] Finding an environmentally safe and cost-effective method which is efficient enough to meet the regulatory standards of potable and industrial wastewater presents unique challenges. In this work, Moringa stenopetala seed powder which had particle size of 300μm was characterized; ash content 4.7%, bulk density 0.531/cm3, particle density 0.88g/cm3, color yellowish, and pH4.5. Fourier transform infrared spectroscopy analysis showed the multifunctionality of the M. stenopetala seed powder. M. stenopetala seed powder was assessed for percentage chromium removal and milligrams per gram chromium uptake as a function of contact time, pH, and dose of the adsorbent and initial concentration. The maximum percent removal was 99.74%. Sorption kinetics of chromium adsorption by M. stenopetala seed powder was predicted reliably using a pseudo-second order model. An intra-particle diffusion model revealed that the biosorption of metals proceeds through various processes. Equilibrium uptakes were evaluated using Langmuir, Freundlich, Temkin, and the Dubinin-Radushkevich adsorption isotherm models. Even though the correlation coefficient was not as high as the Langmuir and Freundlich models for Temkin adsorption isotherm model, the metal uptake which was predicted by the model is comparable with the experimental value. Generally, the seed powder of M. stenopetala was found to be effective in the removal of chromium from tannery wastewater. Springer Science+Business Media Dordrecht, 2013 Chromium nationallicence Moringa stenopetala nationallicence Wastewater nationallicence Adsorption isotherm nationallicence Adsorption kinetics nationallicence Degefu Dagmawi Center for Environmental Sciences, Addis Ababa University, Addis Ababa, Ethiopia aut Dawit Mekibib Center for Environmental Sciences, Addis Ababa University, Addis Ababa, Ethiopia aut Water, Air, & Soil Pollution Springer Netherlands 224/12(2013-12-01), 1-10 0049-6979 224:12<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1719-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1719-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Degefu Dagmawi Center for Environmental Sciences, Addis Ababa University, Addis Ababa, Ethiopia aut NATIONALLICENCE 700 1- Dawit Mekibib Center for Environmental Sciences, Addis Ababa University, Addis Ababa, Ethiopia aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/12(2013-12-01), 1-10 0049-6979 224:12<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer