Biosorption of cadmium by biomass of brown marine macroalgae

被引：169

作者：

Lodeiro, P ^{[1
]}

Cordero, B ^{[1
]}

Barriada, JL ^{[1
]}

Herrero, R ^{[1
]}

de Vicente, MES ^{[1
]}

机构：

[1] Univ A Coruna, Dept Quim Fis & Ingn Quim 1, La Coruna 15008, Spain

来源：

BIORESOURCE TECHNOLOGY | 2005年 / 96卷 / 16期

关键词：

biosorption; cadmium; marine macroalgae; kinetics; equilibrium; acid-base properties;

D O I：

10.1016/j.biortech.2005.01.002

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Five different brown seaweeds, Bifurcaria bifurcata, Saccorhiza polyschides, Ascophyllum nodosum, Laminaria ochroleuca and Pelvetia caniculata were studied for their ability to remove cadmium from aqueous solution. Kinetics of cadmium adsorption by all the algae were relatively fast, with 90% of total adsorption occurring in less than I h. These experiments could be accurately described by a pseudo-second-order rate equation, obtaining values between 1.66 x 10(-3) and 9.92 x 10(-3) g/Mg min for the sorption rate constant k. Several equilibrium adsorption isotherms were obtained for the quantitative description of cadmium uptake. The use of the Langmuir isotherm led to values between 64 and 95 mg/g for q(max) and between 0.036 and 0.094 L/mg for b. The effect of pH on biosorption was also studied. Acid-base properties of algae were studied by potentiometry to determine pK values (from 3.54 to 3.98) and the total number of acid groups. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1796 / 1803

页数：8

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