title: Bisphenol-A modified hyper-cross-linked polystyrene resin for salicylic acid removal from aqueous solution: adsorption equilibrium, kinetics and breakthrough studies.
abstract: In this study, a series of bisphenol-A modified hyper-cross-linked polystyrene resins labeled as HJ-L00, HJ-L02, HJ-L04, HJ-L06 and HJ-L08 were synthesized, characterized and evaluated for adsorptive removal of salicylic acid from aqueous solutions. The structural characterization results indicated that the resins possessed predominant micropores/mesopores, moderate specific surface area and a few bisphenol-A groups on the surface. All the bisphenol-A modified hyper-cross-linked resins were effective for removing salicylic acid from aqueous solutions, and sample HJ-L02 had the largest adsorption capacity. The adsorption equilibrium data were correlated by the Freundlich isotherm model, and a positive adsorption enthalpy was obtained. The kinetic data were analyzed with two diffusion models and indicated that the intra-particle diffusion was the sole rate-controlling step in the first stage. The dynamic experimental results showed that the breakthrough point of the HJ-L02 adsorbent was at 90.2 BV (bed volume, 1 BV=10 mL) for a feed concentration of 500.0mg/L of salicylic acid, and 14.0 BV of 1% of sodium hydroxide could completely regenerate the HJ-L02 adsorbent column.
authors.affiliation: School of Geosciences and Info-Physics, Central South University, Changsha 410083, China.
authors.forename: Huanxiao
authors.initials: H
authors.lastname: Hu
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Wang
authors.forename: Shengyong
authors.initials: S
authors.lastname: Li
authors.forename: Jianhan
authors.initials: J
authors.lastname: Huang
authors.forename: Shuguang
authors.initials: S
authors.lastname: Deng
mesh_terms: D000327:Adsorption; D000890:Anti-Infective Agents / Q000302:isolation & purification; D001559:Benzhydryl Compounds; D003432:Cross-Linking Reagents; D004058:Diffusion; D007700:Kinetics; D010636:Phenols / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry*; D020156:Salicylic Acid / Q000302:isolation & purification*; D012996:Solutions; D013816:Thermodynamics; D014867:Water / Q000737:chemistry; D000098826:Bisphenol A Compounds
chemical_list: D000890:Anti-Infective Agents; D001559:Benzhydryl Compounds; D003432:Cross-Linking Reagents; D010636:Phenols; D011137:Polystyrenes; D020156:Salicylic Acid; D012996:Solutions; D014867:Water; C006780:bisphenol A; D000098826:Bisphenol A Compounds