title: Hydrous iron oxide modified diatomite as an active filtration medium for phosphate capture.
abstract: A simple method to functionalize diatomite with hydrous iron oxide was attempted and its performance as a new active filtration material to remove and recover phosphate from water was investigated under varying solution conditions. The Langmuir phosphate adsorption capacity increased from 0.6 mgP/g for raw diatomite to 4.89, 14.71, 25.02 mgP/g for hydrous iron oxide modified diatomite (HIOMD), depending on the amount of iron loaded. Loading of hydrous iron oxide caused the increase in true and bulk density and a decline in filtration rate, but to a lesser extent. It was shown that the HIOMD product with suitable iron content could retain a good filtration performance with a greatly increased adsorption capacity for phosphate. The phosphate adsorption increased by decreasing pH and by increasing ionic strength at high pH levels. The adsorption process was interpreted by ligand exchange. Coexisting oxyanions of sulfate, nitrate, citrate, carbonate, silicate and humic acid showed different effects on phosphate fixation but it was presumed that their influence at their concentrations and pH levels commonly encountered in effluent or natural waters was limited, i.e., HIOMD had a reasonably good selectivity. Results in repeated adsorption, desorption and regeneration experiment showed that the adsorbed phosphate could be recovered and the material could be reused after regeneration. The column test showed that HIOMD could be potentially utilized as an adsorption filtration medium for phosphate removal and recovery from water.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Shanghai 200240, China. Electronic address: wangzhegeipaishui@163.com.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Shanghai 200240, China. Electronic address: linyansjtu@126.com.
authors.forename: Yan
authors.initials: Y
authors.lastname: Lin
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Shanghai 200240, China. Electronic address: dywu@sjtu.edu.cn.
authors.forename: Deyi
authors.initials: D
authors.lastname: Wu
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Shanghai 200240, China. Electronic address: hnkong@sjtu.edu.cn.
authors.forename: Hainan
authors.initials: H
authors.lastname: Kong
mesh_terms: D000327:Adsorption; D007692:Diatomaceous Earth / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D005374:Filtration; D006812:Humic Substances / Q000032:analysis; D009566:Nitrates / Q000737:chemistry*; D010710:Phosphates / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D006812:Humic Substances; D009566:Nitrates; D010710:Phosphates; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D007692:Diatomaceous Earth; C033787:diatomite; C025302:ferric nitrate
keywords: Diatomite; Filtration; Hydrous iron oxide; Phosphate; Removal