Mechanistic Insight for the Sorption of Cd(II) and Cu(II) from Aqueous Solution on Magnetic Mn-Doped Fe(III) Oxide Nanoparticle Implanted Graphene

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• 作者：Debabrata Nandi ; Tina Basu ; Sushanta Debnath ; Arup K. Ghosh ; Amitabha De ; Uday Chand Ghosh
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：October 10, 2013
• 年：2013
• 卷：58
• 期：10
• 页码：2809-2818
• 全文大小：506K
• 年卷期：v.58,no.10(October 10, 2013)
• ISSN：1520-5134

文摘

The sorption behaviors of M(II) (M = Cu, Cd) were investigated from their aqueous solution by magnetic Mn-doped Fe(III) oxide nanoparticle implanted graphene (GMIO) at varying pH, contact times, and concentrations. Kinetically, the pseudo-second-order equation governed the overall sorption process at optimized pH (5.1 卤 0.1). Redlich鈥揚eterson (R鈥揚) (0.97 < R² < 1.00, 0.84 < g < 1.00) and Langmuir (0.96 < R² < 1.00) isotherms described sorption equilibriums better than Freundlich (0.86 < R² < 0.96). Monolayer sorption capacity values of GMIO for M(II) increased (88 mg路g^鈥? to 127 mg路g^鈥? for Cd; 130 mg路g^鈥? to 144 mg路g^鈥? for Cu) with increasing temperature from 288 K to 333 K. Negative 螖G⁰ values indicated spontaneous sorption nature despite positive 螖H⁰ values owing to an entropy increase (positive 螖S⁰) at the solid鈥搇iquid interface. Relatively less regeneration (70%) of M^II鈥揋MIO by 0.1 M HCl possibly stemmed the chemisorption of metal ions, and this is well-corroborated by the nature of Stern鈥揤olmer plot of fluorescence quenching data with reaction time.