Adsorption Of 4-Nitrobenzonitrile And 4-Nitroanisole On NDA-150 Resin

4-Ntrobenzonitrile and 4-nitroanisole were two kinds of important pharmaceutical intermediates. Due to its poor biochemical purification ability, biotechnology was not effective on the treatment of 4-nitrobenzonitrile and 4-nitroanisole. Besides, there are limited published techniques for the treatment of 4-nitrobenzonitrile and 4-nitroanisole waste water. In the paper, the characters of sorption and desorption of 4-nitrobenzonitrile and 4-nitroanisole on NDA-150 resin were roundly studied by static and dynamic methods, respectively. A good adsorption behaviors of the macroporous resin to 4-Ntrobenzonitrile and 4-nitroanisole were observed with pH ranging from 1 to 7,the optimum pH of 4-Ntrobenzonitrile was 2.0,and the optimum pH of 4-Ntrobenzonitrile was 3.0. The results of static adsorption dynamics showed that the adsorption reached equilibrium in 24 hours, the adsorption capacity of NDA-150 resin towards 4-nitrobenzonitrile and 4-nitroanisole were 180.8 mg/g and 396.8 mg/g. The adsorption isotherms of 4-Ntrobenzonitrile and 4-nitroanisole on the macroporous resin fit well to Freundlich equation and the values of R² were greater than 98%. The adsorption occurred on the resin was spontaneous. The adsorption capacity decreased while the temperature increases, which declared that the adsorption was an exothermic process. The dynamic adsorption capacity were 439.4 mg/g and 729.6 mg/g. Lastly, the dynamically adsorbed and saturated resin was leached at a flow of 1 BV/h at temperature of 353K by 8% NaOH(2 BV), 4% NaOH(2 BV), and distilled water(3 BV)in turn, the desorption rate were 42.8%,58.4%. however the effect of elution was not very good use C₂H₅OH as desorption.The main reasons caused low desorption rate were the strong bonds formed between surface functional groups and adsorbates, and the locking function of resin microporous against adsorbates.