Adsorption mechanism of phenolic compounds from aqueous solution on hypercrosslinked polymeric adsorbent.
The adsorption of two phenols, namely, phenol and salicylic acid(SA) onto a water-compatible hypercrosslinked polymeric resin (NJ-8) were studied in terms of pseudo-second-order and first order mechanisms for chemical sorption as well as an intraparticle diffusion mechanism process. Kinetic analysis showed that the intraparticle diffusion process was the essential rate-controlling step. The activation energies of sorption have also been evaluated with the pseudo-second-order and intraparticle diffusion constants, respectively. Adsorption equilibrium data were well fitted by the Langmuir, Freundlich and Redlich-Peterson isotherms. Adsorption was exothermic and basically of a type of transition between physical and chemical character. The sorption capacity was higher for SA due to its more hydrophobic. Phenol has a higher adsorption enthalpy since it could form stronger hydrogen bonding on NJ-8.
Wang
Xue-Jiang
XJ
State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China. xjwang3@163.com
Zhao
Jian-Fu
JF
Xia
Si-Qing
SQ
Li
Ai-Min
AM
Chen
Ling
L
D000327:Adsorption; D000890:Anti-Infective Agents / Q000737:chemistry*; D004202:Disinfectants / Q000737:chemistry*; D006860:Hydrogen Bonding; D007700:Kinetics; D008962:Models, Theoretical; D019800:Phenol / Q000737:chemistry*; D011108:Polymers; D020156:Salicylic Acid / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000890:Anti-Infective Agents; D004202:Disinfectants; D011108:Polymers; D014874:Water Pollutants, Chemical; D019800:Phenol; D020156:Salicylic Acid