Abstract
A novel-modified magnetic chitosan adsorbent was used to remove selected pharmaceuticals, i.e., diclofenac (DCF) and clofibric acid (CA) and carbamazepine (CBZ), from aqueous solutions. The characterization of magnetic chitosan was achieved by scanning electron and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, vibrating sample magnetometer, and nitrogen sorption analysis. The magnetic chitosan had effective sorption affinity for DCF and CA but no sorption of CBZ was observed. The sorption capacities of CA and DCF in the individual solutions were 191.2 and 57.5 mg/g, respectively. While in mixed solution, DCF showed higher sorption affinity. Sorption kinetics indicated a quick equilibrium reached within 2 min. Lower solution pH values were found to be advantageous for the adsorption process. The sorption efficacy of CA declined significantly with increasing inorganic salt concentration. However, sorption performance of DCF was stable under different ionic strength conditions.
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This study is financed by Natural Science Foundation of China (21246001, 51138009, 41101480) and the National Key Technologies R&D Program of China (no. 2012BAJ25B02, 2012BAJ25B04).
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Zhang, Y., Shen, Z., Dai, C. et al. Removal of selected pharmaceuticals from aqueous solution using magnetic chitosan: sorption behavior and mechanism. Environ Sci Pollut Res 21, 12780–12789 (2014). https://doi.org/10.1007/s11356-014-3212-1
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DOI: https://doi.org/10.1007/s11356-014-3212-1