Influence of organic alkali on the preparation of lignin-based anionic adsorbents and their performance in the removal of nitrate

摘要

Lignin-based anionic exchange resin was synthesized by modified alkali lignin after reaction with epichlorohydrin and triethylamine in the weak alkaline medium provided by pyridine in the organic medium of N,N-dimethylformamide(DMF). The influence of pyridine on synthesis process and yield of products were discussed. The product was characterized by FTIR spectroscopy analysis and the adsorbent capabilities for N from aqueous solution were also exploited. The factors that might influent the adsorption performance were investigated. An adsorbent dosage of 0.2g, adsorption time of l00min, pH of 4 and the initial concentration of nitrate concentration was 10mg/l were selected as optimum conditions.