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| Preparation of Lignin Based Heavy Metal Adsorbent by Lignin Aminating Modification |
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| Key Words:lignin acylation aminating modification Pb2+ adsorption |
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| Abstract:In this experiment, Lignin based heavy mental adsorbent used for obsorbing Pb2+ solution was prepared by aminating modification using lignin as raw material. The purified lignin was modified by amber anhydride firstly, then reacted with triethylene tetramine using paratoluensulfonyl chloride as catalyst the aminatd lignin was prepared. The product was characterized by carboxyl group determination, Fourier Transform Infrared spectrum (FT-IR) and adsorption performance analysis.The results showed that when the molar ratio of amber anhydride and lignin was 1.5∶1, the reaction time was 1 h, the temperature was 28℃, pH value was 8.5～9.0, the carboxyl group content of the modified lignin was 1.98 mmol/g. FT-IR spectrum analysis showed that lignin modification was successful.The adsorption of Pb2+ was in accordance with the pseudo two order kinetic model and Freundlich model. The adsorption capacity of the product improved with the increase of pH, and the adsorption capacity decreased when pH value>5. When pH value was 5, the adsorption capacity reached 152.95 mg/g. |
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