以过硫酸铵为氧化剂，采用化学氧化法制备了聚苯胺（PANI）。考察了苯胺物质的量、盐酸浓度、苯胺与过硫酸铵摩尔比以及溶液pH对聚苯胺去除碘单质效果的影响。在500 mg/L碘单质溶液中，当聚苯胺投加量为0.3 g/L时，对碘单质的最大去除量为1 421 mg/g。动力学研究表明，聚苯胺对碘单质的吸附符合伪二级动力学模型。通过对反应后的聚苯胺进行表征以及机理实验表明，固定在聚苯胺上的碘单质发生了3种反应过程：一部分碘单质以微弱的作用力吸附在聚苯胺上；另一部分碘单质以掺杂形式固定在聚苯胺上；还有部分碘单质可能进入到聚苯胺的苯环上。研究结果表明，聚苯胺对碘单质不但去除效率高，而且固定效果较好，且固定的碘单质不易脱离。

Polyaniline is prepared via chemical oxidation method with ammonium persulfate as oxidant.The effects of the amount of aniline, the concentration of hydrochloric acid, the molar ratio of aniline to ammonium persulfate and pH value on the removal of iodine are investigated systematically.The maximum removal capacity of polyaniline to iodine is 1, 421 mg·g^-1 if the dosage of polyaniline is 0.3 g·L^-1 in 500 mg·L^-1 iodine solution.Kinetics study shows that the adsorption behavior of polyaniline to iodine conforms to the pseudo-second-order kinetic model.It is verified through characterization on polyaniline after reaction and mechanism experiment that iodine fixed on polyaniline involves in three kinds of reaction process:a part of iodine is adsorbed onto polyaniline by means of a weak action force, a part of iodine is fixed in a doping form onto polyaniline, some iodine may enter the benzene ring of polyaniline.Study results show that polyaniline exhibits a high efficiency in removing iodine and presents a good fixing effect on iodine.The fixed iodine is not easy to escape.

任超(1995-),男,硕士生,研究方向为水处理与能源资源化