Research on the removal of inorganic anions in wastewater using nano-carboxylated chitosan
The aim of this study is to synthesize nano-modified carboxylated chitosan adsorbents and apply them to remove inorganic anions from wastewater.Iron nanoparticles were grafted onto carboxylated chitosan in a two-step process to obtain nano-carboxylated chitosan adsorbents,which were characterized using Fourier transform infrared spectroscopy(FTIR)and dynamic light scattering(DLS).The effects of pH value,adsorbent concentration,anion concentration,and contact time on the adsorption of anions by the adsorbent were evaluated.The results showed that the concentration of adsorbed anions was higher at acidic pH.The higher the adsorbent concentration,the higher the adsorption rate.The amount of adsorbed anions increased with increasing contact time from 10～60 minutes,but remained relatively constant after 60 minutes.The study results indicate that chitosan-modified adsorbents can effectively remove nitrate,fluoride,and phosphate anions from aqueous solutions.
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