Removal of Arsenite in Water Using Biogenic Schwertmannite as Adsorbent
Synthesis of schwertmannite through oxidation of ferrous sulfate by Acidithiobacillus ferrooxidans cells and adsorption of arsenite As(Ⅲ) from water were investigated in the present study. Furthermore, the stability of As(Ⅲ)-sorbed biogenic schwertmannite was studied. Results showed that hedge-hog like schwertmannite formed after reaction for 72 h were spheroid particles with a diameter of approximately 2.5 μm and its chemical formula could be expressed as Fe8O8(OH)4.42(SO4)1.79. As(Ⅲ) in water could be effectively removed by biogenic schwertmannite with a maximum adsorption capacity of 113.9 mg As(Ⅲ) per g of adsorbent and the optimum pH for As(Ⅲ) adsorption was in the range of 7-10. The As(Ⅲ) removal was unaffected by the competing monovalent anions such as Cl- and NO3-, whereas PO43- and SO42- greatly decreased the As (Ⅲ) removal efficiency only when the molar ratio of P to As and S to As in solution reached 75:1 and 750:1, respectively. Furthermore, As(Ⅲ)-sorbed biogenic schwertmannite exhibited no mineralogy phase change after ageing at pH 6.0 and 8.5 for 90 d. And As(Ⅲ) could be effectively immobilized in biogenic schwertmannite, indicating that the transformation of metastable schwertmannite to goethite was significantly inhibited by sorption of As(Ⅲ). The study shows that synthetic biogenic schwertmannite can be a very efficient innovative adsorbent for removing As(Ⅲ) from water.
Arsenite (As) removal Biogenic schwertmannite Adsorption Adsorbent Water
Yuehua Liao Jianru Liang Lixiang Zhou
College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China
国际会议
杭州
英文
154-156
2009-10-10（万方平台首次上网日期，不代表论文的发表时间）