title: Preparation of ferric-activated sludge-based adsorbent from biological sludge for tetracycline removal.
abstract: Ferric activation was novelly used to produce sludge-based adsorbent (SBA) from biological sludge through pyrolysis, and the adsorbents were applied to remove tetracycline from aqueous solution. The pyrolysis temperature and mass ratio (activator/dried sludge) greatly influenced the surface area and pore characteristics of SBA. Ferric activation could promote the porous structure development of adsorbents, and the optimum preparation conditions were pyrolysis temperature 750°C and mass ratio (activator/dried sludge) 0.5. In batch experiments, ferric-activated SBA showed a higher adsorption capacity for tetracycline than non-activated SBA, because the enhanced mesoporous structure favored the diffusion of tetracycline into the pores, the iron oxides and oxygen-containing functional groups in the adsorbents captured tetracycline by surface complexation. The results indicate that ferric activation is an effective approach for preparing adsorbents from biological sludge to remove tetracycline, providing a potential option for waste resource recovery.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: xgr@hit.edu.cn.
authors.forename: Guoren
authors.initials: G
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Huarong
authors.initials: H
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D016062:Porosity; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D013752:Tetracycline / Q000737:chemistry / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D005290:Ferric Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D013752:Tetracycline
keywords: Adsorption; Biological sludge; Ferric activation; Sludge-based adsorbent; Tetracycline