Removal of endocrine disrupting chemicals from aqueous phase using spherical microporous carbon prepared from waste polymeric exchanger.
A spherical microporous carbon adsorbent (CR-1), which was developed by carbonization and activation of the waste polysulfonated cation-exchanger, was used to remove Dimethyl phthalate (DMP) and 2, 4-dichlorophenol (2, 4-DCP) as the model compounds of EDCs from the aqueous solution. Four adsorption isotherm models, Langmuir, Freundlich, Toth and Polanyi-Dubinin-Manes equations were tested to correlate the experimental data, Toth and Polanyi-Dubinin-Manes isotherms models provided the best correlation. The Henry's law constants calculated from Toth equation were found to be 705.957 and 6,724.713 L g(-1) for 2, 4-DCP and DMP at 298 K, respectively, and the larger exponents n of the Freundlich model were 9.011 and 9.93 for 2, 4-DCP and DMP at 298 K, respectively. The values of Henry's law constants and exponent n of the Freundlich suggested that CR-1 was an effective adsorbent for removal of low concentrations of DMP and 2, 4-DCP from aqueous solution. Moreover, the adsorption kinetics results showed that adsorption of 2, 4-DCP and DMP on CR-1 was a pseudo-second-order process controlled by intra-particle diffusion and that adsorption uptake reached quickly half of equilibrium capacities within 20 min.
Long
Chao
C
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China. clong@nju.edu.cn
Lu
Jundong
J
Li
Aimin
A
Zhang
Quanxing
Q
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry / Q000302:isolation & purification; D004058:Diffusion; D052244:Endocrine Disruptors / Q000737:chemistry* / Q000302:isolation & purification*; D007475:Ion Exchange Resins / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D010795:Phthalic Acids / Q000737:chemistry / Q000302:isolation & purification; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D014867:Water / Q000737:chemistry*
D002733:Chlorophenols; D052244:Endocrine Disruptors; D007475:Ion Exchange Resins; D010795:Phthalic Acids; D011108:Polymers; D014867:Water; C024629:dimethyl phthalate; D002244:Carbon; C004762:2,4-dichlorophenol