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| The Study of Absorption of Ponceau 4R by Amorphous Calcium Phosphate Modified Zero Valent Iron |
| LIU Fang-tong, WANG Ying, ZHANG Ke-shi, JIN Li
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Abstract Amorphous calcium phosphate modified zero-valent iron was successfully synthesized by co-precipitation method under nitrogen protection, and the adsorption of ponceau 4 R by amorphous calcium phosphate modified zero valent iron was explored. The effects of reaction time, reaction temperature, ponceau 4R concentration and the quantity of amorphous calcium phosphate modified zero-valent iron added on the adsorption capacity were studied to optimize experimental conditions. When 30 ml of 1 g/L ponceau 4 R solutions was added at room temperature, the best adsorption effect can be obtained when the adsorption time was 8 minutes. And the removal rate increases with the increasing of amorphous calcium phosphate modified zero-valent iron, and the maximum adsorption capacity is 133.3 mg/g. Pseudo-first-order, pseudo-second-order rate equation, intraparticle diffusion model, and Langmuir adsorption isotherm were used to analyze the adsorption process. The adsorption process conformed to pseudo-second-order kinetic equation. This study laid the experimental foundation for the treatment of printing and dyeing waste water.
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Published: 25 May 2018
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