title: Modification of cyanobacterial bloom-derived biomass using potassium permanganate enhanced the removal of microcystins and adsorption capacity toward cadmium (II).
abstract: Cyanobacterial biomass shows high adsorption capacity toward heavy metal ions. However, the cyanotoxins in the cyanobacterial biomass inhibit its application in heavy metals removal. In order to safely and effectively remove Cd(II) from water using cyanobacterial bloom-derived biomass (CBDB), KMnO4 was used to modify CBDB. The results indicated that the microcystins in the CBDB were successfully removed by KMnO4. Potassium permanganate oxidation caused the transformation of hydroxyl to carboxyl on the CBDB, and formed manganese dioxide on the surface of CBDB. The oxidized CBDB showed higher adsorption capacity toward Cd(II) than that of unoxidized treatment. The optimal KMnO4 concentration for increasing the adsorption capacity of CBDB toward Cd(II) was 0.2g/L. The adsorption isotherm of Cd(II) by oxidized- or unoxidized-CBDB was well fitted by Langmuir model, indicating that the adsorption of Cd(II) by CBDB was monolayer adsorption. The desorption ratio of Cd(II) from oxidized CBDB was higher than that from unoxidized CBDB in the desorption process using NH4NO3 and EDTA as desorbent. The results presented in this study suggest that KMnO4 modified CBDB may be used as a safe and high efficient adsorbent in Cd(II) removal from water.
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China; Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Jihai
authors.initials: J
authors.lastname: Shao
authors.affiliation: Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use, Hunan Agricultural University, Changsha 410128, PR China; Laboratory of Environmental Microbiology and Toxicology, School of Biological Sciences, The University of Hong Kong, Hong Kong Special Administrative Region.
authors.forename: Ji-Dong
authors.initials: JD
authors.lastname: Gu
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Liang
authors.initials: L
authors.lastname: Peng
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Si
authors.initials: S
authors.lastname: Luo
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China.
authors.forename: Huili
authors.initials: H
authors.lastname: Luo
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China. Electronic address: zhyyan111@163.com.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Yan
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China. Electronic address: wugenyi99@163.com.
authors.forename: Genyi
authors.initials: G
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D018533:Biomass; D002104:Cadmium / Q000737:chemistry*; D000458:Cyanobacteria / Q000187:drug effects*; D005068:Eutrophication; D007477:Ions; D017895:Manganese Compounds / Q000737:chemistry; D019216:Metals, Heavy; D052998:Microcystins / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D011196:Potassium Permanganate / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods
chemical_list: D007477:Ions; D017895:Manganese Compounds; D019216:Metals, Heavy; D052998:Microcystins; D010087:Oxides; D014874:Water Pollutants, Chemical; D002104:Cadmium; D011196:Potassium Permanganate; D014867:Water; D010100:Oxygen; C016552:manganese dioxide
keywords: Adsorption; Cadmium; Cyanobacterial biomass; Cyanobacterial bloom; Manganese dioxide; Microcystins