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首页> 外文期刊>RSC Advances >Preparation of amidoxime surface-functionalized polyindole (ASFPI) nanofibers for Pb(II) and Cd(II) adsorption from aqueous solutions
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Preparation of amidoxime surface-functionalized polyindole (ASFPI) nanofibers for Pb(II) and Cd(II) adsorption from aqueous solutions

机译：水溶液中吸附Pb（II）和Cd（II）的of胺肟表面功能化聚吲哚（ASFPI）纳米纤维的制备

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摘要

Amidoxime surface-functionalized polyindole (ASFPI) nanofibers were prepared by electrospinning of chemically synthesized poly(5-cyanoindole) followed by surface modification. The as-prepared ASFPI nanofibers were characterized with FTIR, SEM, BET surface areas and water contact angle measurement. Meanwhile, the adsorption properties and mechanism of ASFPI nanofibers towards Pb(II) and Cd(II) in aqueous solution were mainly investigated by a batch method. It was found that ASFPI nanofibers showed a high affinity towards Pb(II) and Cd(II). The maximum adsorption capacities were found to be 307.44 and 108.49 mg g(-1) for Pb(II) and Cd(II), which are markedly high values compared to other fiber adsorbents reported. The adsorption isotherms were better fitted with the Langmuir model rather than Freundlich and Temkin models. The kinetics data analysis showed that the adsorption process could be described by a pseudo-second order kinetic model, suggesting a chemisorption process as the rate limiting step. Thermodynamic parameters revealed the spontaneity of the adsorption process and higher temperature favored adsorption. Regeneration tests showed that ASFPI nanofibers could be reused repetitively for 10 times with 80% of the initial adsorption capacity.
机译：通过电纺化学合成的聚（5-氰基吲哚），然后进行表面改性，制备了ox肟表面功能化的聚吲哚（ASFPI）纳米纤维。通过FTIR，SEM，BET表面积和水接触角测量对所制备的ASFPI纳米纤维进行了表征。同时，主要通过间歇法研究了ASFPI纳米纤维对水溶液中Pb（II）和Cd（II）的吸附特性和机理。发现ASFPI纳米纤维对Pb（II）和Cd（II）具有高亲和力。对Pb（II）和Cd（II）的最大吸附容量为307.44和108.49 mg g（-1），与报道的其他纤维吸附剂相比，其吸附值明显较高。吸附等温线更适合Langmuir模型，而不是Freundlich和Temkin模型。动力学数据分析表明，吸附过程可以用拟二级动力学模型描述，表明化学吸附过程是限速步骤。热力学参数显示了吸附过程的自发性，较高的温度有利于吸附。再生测试表明，ASFPI纳米纤维可以重复使用10次，初始吸附容量为80％。

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