The La^(3+)-loaded adsorbent was prepared by the reaction between La^(3+) and ethanolamine-modifying vegetable tannic extract, to treat F^--containing wastewater. The problems of heavy color caused by vegetable tannic...The La^(3+)-loaded adsorbent was prepared by the reaction between La^(3+) and ethanolamine-modifying vegetable tannic extract, to treat F^--containing wastewater. The problems of heavy color caused by vegetable tannic extract and of turbidity caused by reaction between La^(3+) and F^- were solved. When other conditions were not changed, and pH, temperature, stirring time, and dose were changed respectively and the adsorbance was tested respectively. The results show that this adsorbent possesses high saturated adsorptive capacity (18.86 mg·g^(-1)) when pH is 5～6, T≤80 ℃, 0.2 g dosage, and 180 min agitating time, and the adsorbance reaches the highest (98.5%). The adsorbent can be easily regenerated with 0.5 mol·L^(-1) NaOH at pH 12.展开更多
文摘The La^(3+)-loaded adsorbent was prepared by the reaction between La^(3+) and ethanolamine-modifying vegetable tannic extract, to treat F^--containing wastewater. The problems of heavy color caused by vegetable tannic extract and of turbidity caused by reaction between La^(3+) and F^- were solved. When other conditions were not changed, and pH, temperature, stirring time, and dose were changed respectively and the adsorbance was tested respectively. The results show that this adsorbent possesses high saturated adsorptive capacity (18.86 mg·g^(-1)) when pH is 5～6, T≤80 ℃, 0.2 g dosage, and 180 min agitating time, and the adsorbance reaches the highest (98.5%). The adsorbent can be easily regenerated with 0.5 mol·L^(-1) NaOH at pH 12.
