Abstract: The modified adsorbent originated from salix psammophila activated carbon fibers were prepared by nitric acid oxidation treatment, and the difference in structure and performance were analyzed with the help of fourier infrared spectrum, scanning electron microscopy (SEM) and other methods between the modified and initial adsorbent. The influence of pH on adsorption effect, the difference of fitting results based on two adsorption isotherm models and two adsorption kinetic models and the adsorption properties of recycling was investigated, respectively, in the test of removing lead ion from sewage. The results showed that fibers whole morphology of modified adsorbent has not been changed, compared with initial adsorbent, oxygen-containing functional groups and micropores were increased on the surface. With the increase of pH values, the adsorption capacity and adsorption rate of lead ions of modified adsorbent were greater than the unmodified activated carbon, and the adsorption process were reasonably described by Langmuir isotherm model and pseudo second order kinetic. In addition, the modified activated carbon fibers has excellent cyclic perfor-mance.
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2018, Vol. 32 
