杨梅单宁为模板制备介孔Al2O3吸附材料及其对模拟含低质量浓度F-饮用水吸附性能研究

Synthesis of Mesoporous Aluminum Oxide Using Bayberry Tannin as Template and Investigation on Its Adsorption Performance Towards Fluoride Containing Drinking Water with a Low Concertration

采用天然高分子杨梅单宁(BT)为模板,Al(NO3)3·9H2O为无水铝源,水相体系中极方便地制备获得介孔氧化铝(Al2O3),可用于深度吸附水体中低质量浓度氟离子(F-).吸附效果最好的Al2O3 -600的制备条件为:Al3+与BT摩尔比为1∶1,pH值为4.5,焙烧温度为600 ℃.采用TGA、XRD、FT-IR、N2 吸附-脱附等手段对Al2O3-600结构进行表征.该材料用于吸附模拟含低质量浓度F -饮用水(10mg/L),最佳实验条件下对F -吸附较为彻底,吸附率为80.85%,同时该材料表现出稳定的重复使用性,重复使用5次后吸附性能仅降低27.4%.

Alumina oxide (Al 2 O 3 ) with mesoporous structure was synthesized in aqueous solution, where bayberry tannin acting as template and aluminum nitrate as aluminum precursor, respectively. The mesoporous Al 2 O 3 was utlized as adsorbant towards fluoride ion (F-) with a low concentration in simulated drinking water. The preparation condition for Al 2 O 3-600 that exhibits the optimal adsorption performance was determined as follows: the weight ratio of Al 3+/BT 1∶1, pH 4.5 and calcination temperature 600 ℃. Meanwhile, the Al 2 O 3-600 was systematically characterized by means of TGA, XRD, FT-IR and BET method. It was found that the Al 2 O 3-600 exhibited excellent adsorption performance while adsorbing F- with a low concerntration of 10 mg/L, i.e., adsorption degree reaching as high as 80.85%, noteworthily, only 27.4% loss of adsorption ability even continuously reused for 5 times.