Adsorption of naphthalene onto the carbon adsorbent from waste ion exchange resin: equilibrium and kinetic characteristics.
Polycyclic aromatic hydrocarbons (PAHs) are widespread environmental pollutants that can result in serious health problems and genetic defects in humans. In this research, a spherical microporous carbon adsorbent (CR-1) had been obtained by carbonization and activation of the waste polysulfonated cation exchange resin. Naphthalene was adopted as a model compound to examine the adsorption effectiveness for removing PAHs from the aqueous solution by CR-1. Nonlinear isotherms models, i.e., Freundlich, Langmuir, Brunauer-Emmett-Teller and Polanyi-Dubinin-Manes models were tested to fit experimental data. The adsorption equilibrium data of naphthalene on CR-1 was fitted well by the Polanyi-Dubinin-Manes model. Through both isotherm modeling and constructing "characteristic curve", Polanyi theory was useful to describe the adsorption process of naphthalene by CR-1, providing evidence that a micropore filling phenomenon is involved. In addition, among the tested kinetic models in this study (e.g., pseudo-first-order and pseudo-second-order equations), the pseudo-first-order equation successfully predicted the kinetic adsorption process.
Long
Chao
C
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, PR China. clong@nju.edu.cn
Lu
Jundong
J
Li
Aimin
A
Hu
Dabo
D
Liu
Fuqiang
F
Zhang
Quanxing
Q
D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D002411:Cation Exchange Resins / Q000737:chemistry*; D007700:Kinetics; D009281:Naphthalenes / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D014753:Vinyl Compounds / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D002411:Cation Exchange Resins; D009281:Naphthalenes; D011137:Polystyrenes; D014753:Vinyl Compounds; D014874:Water Pollutants, Chemical; C031721:naphthalene; D002244:Carbon; C004985:divinyl benzene