Recovering bromide ions from wastewater can not only alleviate the shortage of bromine resources but also solve the problem of bromine pollution. However, there is no efficient method for selective extraction of bromide ions from bromine-containing wastewater up to now. In this paper, chitosan was acidified into a gel to extend its molecular chain, modified by quaternary ammonium salt functional groups, and then crosslinked to obtain a new adsorption material. The prepared adsorbents were characterized by FT-IR, SEM, XPS and TGA. The effects of adsorption time, pH value, adsorbent dosage, coexisting anions, reusability on the adsorption behavior of bromide ions were studied. Under the optimum adsorption conditions, the saturated adsorption capacity of the adsorbent was 38.21 mg·g at the temperature of 298 K and pH of 7. In addition, batch adsorption experiments showed that the adsorption of bromide ions was better consistent with pseudo-second-order kinetic model and Langmuir model, which could also further clarify the adsorption process mechanism. The mechanism of adsorption behavior of bromide ions on quaternary ammonium-modified chitosan was based on ion exchange. This work provides a new possibility for the recovery of bromide ions from wastewater.
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