Abstract
A novel chitosan/attapulgite (CTS/APT) composite adsorbent was prepared. Adsorption experiments were carried out as a function of types of adsorbent, ratio, contact time, pH, temperature. It was found that the adsorption capacity of Ni <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> on composite adsorbent was the highest. The composite adsorbent had the highest adsorption efficiency when the ratio was 30 wt%. The adsorption of Ni <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> reached equilibrium within 60 min. The composite adsorbent was particularly effective for the Ni <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> removal at pH 5.0. Evaluation of adsorption process from 288 K to 318 K identified its endothermic nature. Equilibrium data of Ni <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> onto this composite adsorbent was well described by Langmuir isotherm model which indicated a physical adsorption process.
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