Adsorptive Properties of Fish Scales of Oreochromis Niloticus (Mojarra Tilapia) for Metallic Ion Removal from Waste Water
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- 作者：J. F. Villanueva-Espinosa ; M. Herná ; ndez-Esparza ; and F. A. Ruiz-Treviñ ; o
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2001
- 出版时间：August 8, 2001
- 年：2001
- 卷：40
- 期：16
- 页码：3563 - 3569
- 全文大小：167K
- 年卷期：v.40,no.16(August 8, 2001)
- ISSN：1520-5045
文摘
The present work presents the experimental study of the adsorptive properties for the removalof Cu2+, Pb2+, Co2+, and Ni2+ metallic ions from water of thermally pretreated fish scales froma very common and abundant source in Mexico, the Oreachromis Niloticus fish, known as"Mojarra Tilapia". To determine the influence and importance that the two main fractions (theorganic or protein fraction and the inorganic fraction mainly composed of hydroxyapatite) ofthis material play in this adsorptive capacity, the original pretreated fish scales are subjectedto an acid demineralization and a basic deproteinization treatment to modify the organic/inorganic matter ratios present, and their materials are characterized in terms of their adsorptionability, especially in the removal of the Cu2+ ion. The adsorption isotherms for the thermallypretreated fish scales show that they have a maximum Cu2+ adsorption capacity of 58 mg ofCu2+ /g of adsorbent with an ion selectivity removal in the order Cu2+ > Pb2+ > Co2+ > Ni2+.When the pure organic and inorganic parts of the fish scales are used in the adsorptionexperiments, the inorganic part has a 75% higher removal capacity than the organic fraction.The adsorption experiments using fish scales with different organic or inorganic fractions showa nonadditive, synergistic effect on the equilibrium amount of metallic ion adsorbed, which isindependent of the inorganic content between 30 and 90 wt % of this inorganic fraction. Low-vacuum scanning electron microscopy and elemental analysis reveal that the ion-exchangereaction is the main mechanism for the metallic ion adsorption by fish scales.