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Physicochemical characteristics of poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) electrospun nanofibres for the adsorption of phenol
Journal of Experimental Nanoscience ( IF 2.8 ) Pub Date : 2020-02-05 , DOI: 10.1080/17458080.2020.1714599
Ainil Hawa 1 , Kumar Sudesh 2 , Suresh Sagadevan 3 , Abdul Mukheem 1 , Nanthini Sridewi 1
Affiliation  

Abstract

In this study, adsorption treatment of phenol pollutant using electrospun poly(3-hydroxybutyrate) [P(3HB)] and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HHx)] is highlighted for the first time. Both P(3HB) and P(3HB-co-3HHx) were extracted from bacterial cells and nanofibres were fabricated through electrospinning technique for the adsorption of phenol. The electrospun nanofibres were optimised after preliminary study of the electrospinning parameters (i.e. applying different voltages, polymer concentrations and mixed solvent ratios). The effects of adsorption under different variables such as contact of time, pH, initial concentration and temperature were studied. The raw polymers were characterised with gas chromatography (GC), gas permeation chromatography (GPC) while the electrospun fibres were investigated using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and viewed under field emission scanning electron microscope (FESEM). P(3HB) had higher molecular weight as well as higher crystallinity and thermal stability than P(3HB-co-3HHx). The maximum phenol adsorption capacity of optimised nanofibre with weight of 0.14 g was 35.7 mg/g. The adsorption trend of the isotherm followed the Freundlich (R2 = 0.99) and adsorption kinetics of pseudo-second-order. The equilibrium contact time was 10 min with 99.8% of the phenol removed and attained 99.9% removal after optimal contact time of 270 min for all samples. This innocuous product has strong affinity towards organic pollutants and zero by-products were produced after the adsorption.



中文翻译:

聚(3-羟基丁酸酯)和聚(3-羟基丁酸酯-co-3-羟基己酸酯)电纺纳米纤维对苯酚的吸附的理化特性

摘要

在这项研究中,使用电纺丝的聚(3-羟基丁酸酯)[P(3HB)]和聚(3-羟基丁酸酯苯酚污染物的吸附处理-3-羟基己酸酯)[P(3HB--3HHx)]被高亮显示为第一次。P(3HB)和P(3HB- co从细菌细胞中提取-3HHx),并通过静电纺丝技术制备纳米纤维以吸附苯酚。在对静电纺丝参数进行初步研究(即施加不同的电压,聚合物浓度和混合溶剂比例)后,对静电纺丝纳米纤维进行了优化。研究了不同时间,pH,初始浓度和温度等接触变量对吸附的影响。通过气相色谱法(GC),气相渗透色谱法(GPC)对原料聚合物进行表征,同时使用热重分析(TGA),差示扫描量热法(DSC)研究电纺纤维并在场发射扫描电子显微镜(FESEM)下观察。P(3HB)比P(3HB-)具有更高的分子量,更高的结晶度和热稳定性co -3HHx)。重量为0.14 g的优化纳米纤维的最大苯酚吸附容量为35.7 mg / g。等温线的吸附趋势遵循Freundlich(R 2 = 0.99)和准二级吸附动力学。平衡接触时间为10分钟,除去了99.8%的苯酚,并且在所有样品的最佳接触时间为270分钟后达到了99.9%的除去率。该无害产品对有机污染物具有很强的亲和力,吸附后产生的副产品为零。

更新日期:2020-04-20
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