利用茭白叶制备的吸附材料除磷性能研究

Removal of phosphate solution using bio-sorbent prepared by agricultural byproduct

以农业废弃物茭白叶为原料,采用氯化亚铁盐溶液浸渍制备改性茭白叶生物吸附剂,并用扫描电镜研究了茭白叶改性前后的表面形貌变化,重点研究了被吸附溶液pH值、浸渍改性液的浓度、生物吸附剂粒度、吸附时间等因素对磷吸附能力的影响。研究结果表明,经12%FeCl2溶液浸渍制得的片状生物吸附剂在pH值5.5的NaH2PO4溶液中经30h吸附后,茭白叶纤维素的羟基与铁离子反应,使得改性后茭白叶生物吸附剂具有较强的吸附能力,其去磷能力最高可达5.02mg/g,吸附符合伪一级动力学模型。

In this paper,the bio-sorbent-the cellulosic material water bamboo leaves（WBL） treated with FeCl2 solution is taken for research about its phosphorus removal capability. Through the SEM, we found the surface morphology changes a little between WBL and the bio-sorbent. By studying the effects of the different experimental parameters,the best phosphorus removal capacity could achieve 5.02mg/g at the condition of the WBL sheet modified with 12 %FeCl2 ,at pHS. 5,and the adsorption time of 30h. The high phosphorus removal capacity mechanism could be due to the formation of compounds on the bio-sorbent. The compounds formed through the ferric ions reacting with hydroxyl on the WBL cellulose. Kinetics studies revealed that the adsorption process follows a pseudo-first order kinetic mode.