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Adsorption of phenolic compound by aged-refuse
1The State Key Laboratory of Pollution Control and Resource Reuse, School of Enviromental Science and Engineering, Tongji University, Siping Road 1239, Shanghai 200092, China. xlchai@mail.tongji.edu.cn
Journal of Hazardous Materials
|April 1, 2006
Summary
Aged refuse effectively adsorbs phenol and chlorinated phenols, with adsorption capacity increasing with more chlorine substituents. Chemical reactions control the adsorption rate, making the process spontaneous and endothermic.
Area of Science:
- Environmental Chemistry
- Adsorption Science
- Waste Management
Background:
- Phenolic compounds, including phenol and its chlorinated derivatives, are common environmental pollutants.
- Aged refuse, a complex waste material, has potential as an adsorbent for removing these pollutants.
Purpose of the Study:
- To investigate the adsorption of phenol, 2-chlorophenol, 4-chlorophenol, and 2,4-dichlorophenol by aged refuse.
- To determine the adsorption isotherms, kinetics, and thermodynamic parameters for these phenolic compounds.
Main Methods:
- Adsorption isotherm studies using Freundlich equation.
- Kinetic analysis employing pseudo-first-order and pseudo-second-order models.
- Thermodynamic analysis to evaluate spontaneity and enthalpy changes.
Main Results:
- Adsorption data for all studied phenols fit the Freundlich equation.
- Chlorinated phenols exhibited stronger adsorption than phenol, with capacity influenced by chlorine substitution.
- Adsorption kinetics followed a pseudo-second-order model, indicating chemical reaction control.
- The adsorption process was found to be spontaneous and endothermic.
Conclusions:
- Aged refuse is a viable adsorbent for phenol and chlorinated phenols.
- The adsorption mechanism involves both partition and chemical adsorption, with chemical reaction being rate-limiting.
- The process is thermodynamically favorable and requires energy input.