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Biosorption of toxic heavy metals Pb(II), Zn(II), Cd (II), Cu(II), Ni(II), Co(II), Hg(II), and Cr(VI) ions from aqueous solutions by loquat bark and leaves was investigated. The effects of pH, contact time, metal ncentration, biosorbent dosage, and temperature on the biosorption process were monitored . The experimental equilibrium biosorption data were analyzed by Langmuir and Freundlich adsorption isotherms. Fourier transform infrared spectrometer (FTIR) analysis confirms that - OH, - NH2, -C-O and -COO groups on loquat bark and leaves are one of the main active groups in metal biosorption process. The kinetic studies indicated that the biosorption of the metal ions followed well pseudo-second order model. The thermodynamic parameters Gibbs free energy ( Go), enthalpy ( Ho), and entropy ( So) changes were also calculated and their values indicated that the biosorption of metal ions on loquat bark and leaves was exothermic and spontaneous. It was concluded that loquat bark and leaves are an effective, low-cost, and environmentally friendly biosorbents for the removal of toxic heavy metal ions from aqueous

"[A] mysterious survival saga that passionate fans describe as a fusion of Lord of the Flies, The Hunger Games, and Lost."—EW.com For the second time in his short life, fourteen-year-old Teddy Biosorption of Heavy Metal Ions from Aqueous Solutions by Agrowastes download ebook Clock has survived a massacre. Orphaned once more when his foster family is murdered, the traumatized teenager has nowhere to turn—until the Boston PD puts Detective Jane Rizzoli on the case. Jane spirits Teddy to the exclusive Evensong boarding school, a sanctuary where young victims of violent crime learn vital skills of survival. But even behind locked gates, Jane fears that Evensong’s benefactors aren’t the only ones watching. And when she learns of two other students whose pasts bear a shocking resemblance to Teddy’s, it becomes chillingly clear that a circling predator has more than one victim in mind. Joining forces with medical examiner Maura Isles, Jane races to stop an obsessed killer’s twisted quest—before an unspeakable secret dooms the children’s fate.

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Author: Akl Awwad,Nidá Salem
Number of Pages: 96 pages
Published Date: 04 May 2011
Publisher: VDM Verlag
Publication Country: Germany
Language: English
ISBN: 9783639354119
Download Link: Click Here
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