title: Adsorption performance of salicylic acid on a novel resin with distinctive double pore structure.
abstract: Two approaches were used to synthesize two resins with different pore structures. In one way, the CH2Cl groups in macroporous chloromethylated polystyrene resin were transformed to methylene bridges, and achieved a hypercrosslinked resin with plentiful micropores (denoted GQ-06). In the other way, 50% of the CH2Cl groups in chloromethylated polystyrene resin was used to produce micropores, while the residual 50% of the CH2Cl groups was reacted with 2-aminopyridine, and prepared another resin with double pore structure of hypercrosslinked resin and macroporous resin (denoted GQ-11). The adsorption of salicylic acid (SA) on GQ-11 was investigated using GQ-06 as the reference adsorbent. The effect of pH on the adsorption of SA on GQ-06 was consistent with the dissociation curve of SA. The maximum adsorption capacity of SA on GQ-11 was observed at the solution pH of 2.64. The greater adsorption rate of SA on GQ-11 than that of GQ-06 was attributed to its double pore structure. The multifunctional adsorption mechanism of anion exchange and hydrophobic interaction resulted in the larger equilibrium capacity of SA on GQ-11 than that of GQ-06. GQ-06 and GQ-11 could be regenerated by absolute alcohol and 80% of alcohol -0.5mol/L of sodium hydroxide aqueous solution, respectively.
authors.affiliation: College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China. Electronic address: xiaoguqing2005@163.com.
authors.forename: Guqing
authors.initials: G
authors.lastname: Xiao
authors.affiliation: College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China.
authors.forename: Ruiming
authors.initials: R
authors.lastname: Wen
authors.affiliation: College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China.
authors.forename: Aijiao
authors.initials: A
authors.lastname: Liu
authors.affiliation: College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China.
authors.forename: Guowen
authors.initials: G
authors.lastname: He
authors.affiliation: College of Chemistry and Environmental Engineering, Hunan City University, Yiyang 413000, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D011137:Polystyrenes / Q000737:chemistry*; D012117:Resins, Synthetic / Q000138:chemical synthesis*; D020156:Salicylic Acid / Q000302:isolation & purification*; D013816:Thermodynamics
chemical_list: D011137:Polystyrenes; D012117:Resins, Synthetic; D020156:Salicylic Acid
keywords: Adsorption; Double pore structure; Multifunctional adsorption mechanism; Salicylic acid