title: Novel KMnO4-modified iron oxide for effective arsenite removal.
abstract: This work demonstrates the synthesis of a novel KMnO(4)-modified form of iron oxide, MnBT-4, using a fluidized bed reactor (FBR) for the adsorptive removal of arsenic (III)/(V). Characterization by XRD, BET, and SEM indicated that the BT-4 support was poorly crystallized goethite (α-FeOOH) with a specific surface area of 229 m(2) g(-1). In FBR experiments of synthesizing MnBT-4, the Fe and Mn salts were found to have an optimal dosage ratio of less than 4, which maximized the KMnO(4) immobilization efficiency. The immobilized Mn compounds on MnBT-4 underwent an additional oxidation step of As (III), promoting arsenic adsorption. When applied MnBT-4 for As (III) removal from solution, the sorption isotherm was accurately fitted with Langmuir and Freundlich models, while the maximum adsorption capacity of 27.4 mg g(-1) exceeded those of other adsorbents in the literature. Batch experimental results revealed that both raw BT-4 and MnBT-4 could take up a large amount of As (V). However, the MnBT-4 provided a substantially higher As (III) removal efficiency than BT-4.
authors.affiliation: Department of Chemical Engineering, National Chen-Kung University, Tainan, Taiwan. yhhuang@mail.ncku.edu.tw
authors.forename: Yao-Hui
authors.initials: YH
authors.lastname: Huang
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Shih
authors.forename: Fu-Ji
authors.initials: FJ
authors.lastname: Cheng
mesh_terms: D000327:Adsorption; D018053:Arsenites / Q000302:isolation & purification*; D003460:Crystallization; D005290:Ferric Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D011196:Potassium Permanganate / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D018053:Arsenites; D005290:Ferric Compounds; D011196:Potassium Permanganate; C000499:ferric oxide; C015001:arsenite