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| Characterization of Lysine Modified Nanocellulose and Its Adsorption Behavior for Methylene Blue |
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| DOI：10.11980/j.issn.0254-508X.2017.05.002 |
| Key Words:lysine modified nanocellulose Schiff base reaction characterization methylene blue adsorption behavior |
| Fund Project:本课题得到国家自然科学基金(No.21476091)和广东省应用技术研究与发展专项基金(No.2015B020235013)的支持。 |
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| Abstract:In order to obtain efficient biodegradable adsorbent, lysine modified nanocellulose was prepared by periodate oxidation and Schiff base reaction using bamboo cellulose as raw material. It was confirmed that the successful introduction of lysine onto the surface of nanocellulose by means of FT-IR, TEM, TG methods. The adsorption property of lysine modified nanocellulose was evaluated using methylene blue (MB) as a model compound. The effects of pH and adsorbent dosage and initial dye concentration on equilibrium adsorption capacity of MB were studied. The results showed that the equilibrium adsorption capacity of lysine modified nanocellulose was significantly increased compared with those of unmodified nanocellulose and aldehyde-based nanocellulose intermediates. The equilibrium adsorption capacity reached 178 mg/g, which was 61% higher than that of the unmodified nanocellulose (110 mg/g,) at the adsorbent dosage 0.08 wt%, pH value 9 and MB concentration of 200 mg/L. The isothermal adsorption process was in accordance with the Freundlich model. The kinetic data showed that the adsorption of MB onto the nanocellulose derivative could be expressed as the second-order kinetics equation． |
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