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Advance modification of polyacrylonitrile nanofibers for enhanced removal of hexavalent chromium from water
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-01-26 , DOI: 10.1002/app.52169 Donya Sharafoddinzadeh 1 , Maryam Salehi 1 , Santa Jansone‐Popova 2 , Amali Herath 1 , Linkon Bhattacharjee 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-01-26 , DOI: 10.1002/app.52169 Donya Sharafoddinzadeh 1 , Maryam Salehi 1 , Santa Jansone‐Popova 2 , Amali Herath 1 , Linkon Bhattacharjee 1
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Hexavalent chromium [Cr(VI)] is a known carcinogenic and mutagenic heavy metal. Its level in drinking water is regulated worldwide to protect public health. This study presents a novel chemical method to modify the polyacrylonitrile (PAN) nanofibers for efficient Cr(VI) removal from water. The PAN nanofibers with an average diameter of 165 nm are produced using the electrospinning technique. Through a 2-step chemical modification process, the amidine polyacrylonitrile (APAN) nanofibers are synthesized by the conversion of nitrile groups [CN] in PAN nanofibers into amidines [C(N═NH)(NH2)]. The attenuated total reflectance Fourier transform (ATR-FTIR) spectroscopy revealed the successful conversion of nitrile groups into amidoximes, resulting in amidoximated polyacrylonitrile nanofibers, and subsequent conversion into amidine functional groups, forming the APAN nanofibers. Greater concentration of hydroxylamine hydrochloride, increased reaction time and temperature yielded higher conversion of nitrile groups into amidoximes to a maximum of 37%. The Cr(VI) uptake by APAN nanofibers was found as a multilayer adsorption process modeled by Freundlich isotherm. The maximum Langmuir Cr(VI) adsorption capacity for APAN nanofibers was found as 225 mg g−1 at pH = 3.0 after 4.0 h exposure duration. The regeneration study revealed the excellent reusability of APAN nanofibers after five adsorption/desorption cycles.
中文翻译：
聚丙烯腈纳米纤维的高级改性以增强从水中去除六价铬
六价铬 [Cr(VI)] 是一种已知的致癌和致突变重金属。其在饮用水中的含量在全球范围内受到监管，以保护公众健康。本研究提出了一种新的化学方法来修饰聚丙烯腈 (PAN) 纳米纤维，以有效去除水中的 Cr(VI)。使用静电纺丝技术生产平均直径为 165 nm 的 PAN 纳米纤维。通过 2 步化学改性工艺，将 PAN 纳米纤维中的腈基团 [ CN] 转化为脒 [ C(N=NH)(NH 2)]。衰减全反射傅里叶变换 (ATR-FTIR) 光谱显示腈基成功地转化为偕胺肟，产生偕胺肟化的聚丙烯腈纳米纤维，随后转化为脒官能团，形成 APAN 纳米纤维。更大浓度的盐酸羟胺、增加的反应时间和温度使腈基团转化为偕胺肟的转化率更高，最高可达 37%。发现 APAN 纳米纤维对 Cr(VI) 的吸收是由 Freundlich 等温线模拟的多层吸附过程。发现 APAN 纳米纤维的最大 Langmuir Cr(VI) 吸附容量为 225 mg g -1在 4.0 小时暴露时间后 pH = 3.0。再生研究表明 APAN 纳米纤维在五次吸附/解吸循环后具有出色的可重复使用性。
更新日期：2022-01-26
中文翻译：
聚丙烯腈纳米纤维的高级改性以增强从水中去除六价铬
六价铬 [Cr(VI)] 是一种已知的致癌和致突变重金属。其在饮用水中的含量在全球范围内受到监管，以保护公众健康。本研究提出了一种新的化学方法来修饰聚丙烯腈 (PAN) 纳米纤维，以有效去除水中的 Cr(VI)。使用静电纺丝技术生产平均直径为 165 nm 的 PAN 纳米纤维。通过 2 步化学改性工艺，将 PAN 纳米纤维中的腈基团 [ CN] 转化为脒 [ C(N=NH)(NH 2)]。衰减全反射傅里叶变换 (ATR-FTIR) 光谱显示腈基成功地转化为偕胺肟，产生偕胺肟化的聚丙烯腈纳米纤维，随后转化为脒官能团，形成 APAN 纳米纤维。更大浓度的盐酸羟胺、增加的反应时间和温度使腈基团转化为偕胺肟的转化率更高，最高可达 37%。发现 APAN 纳米纤维对 Cr(VI) 的吸收是由 Freundlich 等温线模拟的多层吸附过程。发现 APAN 纳米纤维的最大 Langmuir Cr(VI) 吸附容量为 225 mg g -1在 4.0 小时暴露时间后 pH = 3.0。再生研究表明 APAN 纳米纤维在五次吸附/解吸循环后具有出色的可重复使用性。
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