Minisy Islam M, Taboubi Oumayma, Hromádková Jiřina, Bober Patrycja
Institute of Macromolecular Chemistry, Czech Academy of Sciences, 162 00 Prague, Czech Republic.
Gels. 2024 Jun 22;10(7):415. doi: 10.3390/gels10070415.
The preparation of conducting polymer aerogels is an effective strategy to produce innovative materials with enhanced physicochemical properties. Herein, polypyrrole (PPy) aerogels were oxidatively prepared in the presence of tannic acid (TA) with different concentrations (2.5, 5, and 10% mole ratio to pyrrole monomer) under freezing conditions. Nanofibrillated cellulose (NFC) was added during the PPy/TA synthesis to enhance mechanical stability. The effect of TA concentration on the aerogels' morphology, conductivity, thermal stability, and adsorption capacity was investigated. The conductivity of 9.6 ± 1.7 S cm was achieved for PPy/TA prepared with 2.5% TA, which decreased to 0.07 ± 0.01 S cm when 10% TA was used. PPy/TA aerogels have shown high efficacy in removing Cr(VI) ions from aqueous solutions. Adsorption experiments revealed that all the aerogels follow pseudo-second-order kinetics. PPy/TA prepared with NFC has a maximum adsorption capacity of 549.5 mg g.
制备导电聚合物气凝胶是生产具有增强物理化学性质的创新材料的有效策略。在此，在冷冻条件下，于不同浓度（相对于吡咯单体的摩尔比为2.5%、5%和10%）的单宁酸（TA）存在下氧化制备聚吡咯（PPy）气凝胶。在PPy/TA合成过程中添加了纳米纤化纤维素（NFC）以增强机械稳定性。研究了TA浓度对气凝胶形态、导电性、热稳定性和吸附容量的影响。用2.5%TA制备的PPy/TA的电导率达到9.6±1.7 S/cm，而使用10%TA时电导率降至0.07±0.01 S/cm。PPy/TA气凝胶在从水溶液中去除Cr(VI)离子方面显示出高效性。吸附实验表明，所有气凝胶均遵循准二级动力学。用NFC制备的PPy/TA的最大吸附容量为549.5 mg/g。
