[Adsorption performance of haloacetic acids onto 5 GACs from water].
Adsorption performance of 5 GACs were compared on two abundant haloacetic acids (HAAs) as disinfection by-products (dichloroacetic acid and trichloroacetic acid). The adsorption behaviours of the two HAAs were well correlated with Langmuir equation. When the two HAAs co-existed, trichloroacetic acid tended to be adsorbed more easily. The adsorption capacity of a foreign GAC-A for dichloroacetic acid was 4.4-5.7 times that of domestic GACs, and 3.8 times that of another foreign GAC-B, while the adsorption capacity of a foreign GAC-A for trichloroacetic acid was 4.0-5.4 times that of domestic GACs, and 2.6 times that of another foreign GAC-B. The equilibrium study of competitive adsorption between dichloroacetic acid and trichloroacetic acid on GAC-A demonstrates that the relative adsorption capacity of HAAs has a linear increase with their relative equilibrium concentration. The adsorption capacity for trichloroacetic acid is sensitive to changes at its equilibrium concentration greater than that for dichloroacetic acid.
Wang
Kun-ping
KP
Key Lab. of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Qi
Rong
R
Zhang
Yu
Y
Yang
Ming
M
Deng
Rong-sen
RS
D000327:Adsorption; D002606:Charcoal / Q000737:chemistry; D003999:Dichloroacetic Acid / Q000032:analysis*; D004202:Disinfectants / Q000009:adverse effects*; D013696:Temperature; D014238:Trichloroacetic Acid / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis
D004202:Disinfectants; D014874:Water Pollutants, Chemical; D002606:Charcoal; D014238:Trichloroacetic Acid; D003999:Dichloroacetic Acid