Removal of chlorophenols from groundwater by chitosan sorption

• Published in: Water research (Oxford) Vol. 38; no. 9; pp. 2315 - 2322
• Main Authors: Zheng, Shaokui, Yang, Zhifeng, Jo, Do Hyun, Park, Yun Hee
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2004; Elsevier Science
• Subjects: Adsorption; Air. Soil. Water. Waste. Feeding; Animal, plant and microbial ecology; Applied ecology; Applied sciences; Benzene - chemistry; Biological and medical sciences; Chitin - analogs & derivatives; Chitin - chemistry; Chitosan; Chlorophenol; Chlorophenols - chemistry; Ecotoxicology, biological effects of pollution; Environment. Living conditions; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Glucosamine - chemistry; Groundwater; Hydrogen-Ion Concentration; Kinetics; Low–temperature; Medical sciences; Models, Biological; Pollution; Public health. Hygiene; Public health. Hygiene-occupational medicine; Salinity; Sodium Chloride - chemistry; Sorption; Thermodynamics; Water Pollutants, Chemical - isolation & purification; Water treatment and pollution; Sorption; Low–temperature; Chlorophenol; Chitosan; Groundwater; Salinity; Elementary analysis; Modeling; Adsorption; Pentachlorophenol; Kinetics; Surface area; Low temperature; Ground water
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2004.02.010

The equilibrium and kinetics of chlorophenol (CP) sorption by chitosan, poly D-glucosamine, were studied under simulated groundwater conditions. Lower temperature, from 25°C to 15°C and then 5°C, markedly decreased the adsorption rates by a factor of 30–53% and 7–22%. Comparison between two types of chitosan, flakes and highly swollen beads, demonstrated that the maximum pentachlorophenol (PCP) uptake capacities in Langmuir and Freundlich models depend on the specific surface area of the particle. Low temperature (5°C) significantly increased the PCP uptake capacity in comparison to higher temperatures (15°C and 25°C). PCP uptake capacity was halved at pH levels higher than 6.5, and NaCl concentrations greater than 1% blocked PCP sorption almost completely. Of five kinds of chlorophenols, i.e. 2,4,6-trichlorophenol (2,4,6-TCP), 3,4-dichlorophenol (3,4-DCP), 2,3-dichlorophenol (2,3-DCP), 2,6-dichlorophenol (2,6-DCP), 3-monochlorophenol (3-MCP), TCP had the maximum sorption efficiency on flake-type chitosan, followed by DCPs, and finally MCP (the three kinds of DCP, with the same elemental compositions, achieved similar sorption performances).