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Removal of Thiophene and 4,6-Dimethyldibenzothiophene by Adsorption on Different Kinds of Starches
Water, Air, & Soil Pollution ( IF 2.9 ) Pub Date : 2021-09-20 , DOI: 10.1007/s11270-021-05353-3
Patricio Baeza 1 , Bárbara Pasten 1 , Jacqueline Concha 2 , Juan Ojeda 2
Affiliation  

The desulfurization by adsorption of thiophene and 4,6-dimethyldibenzothiophene on unripe banana starch, dessert banana starch, corn starch, and porous corn starch was studied. The adsorbents were characterized by scanning electron microscopy, surface acidity measurement, and infrared spectroscopy with attenuated total reflection. The results showed low values of adsorption of both sulfur molecules on both banana starches, which is due to the absence of cavities or pores in their structure. In the case of corn starch, the presence of cavities or pores allows a greater adsorption capacity for thiophene and 4,6-dimethyldibenzothiophene. The mechanism of interaction between sulfured molecules and the starches can occur through free electron pair of sulfur or the π electron cloud of the aromatic ring with the Brönsted acid site of starches. The enzymatic modification applied to corn starch allowed obtaining a material with a greater number of cavities or pores, but that maintains their structure and physicochemical properties. The presence of pores of a larger size allows adsorbing a greater amount of sulfured molecules in comparison to the native starch.



中文翻译:

不同淀粉吸附去除噻吩和4,6-二甲基二苯并噻吩

研究了噻吩和4,6-二甲基二苯并噻吩在未成熟香蕉淀粉、甜点香蕉淀粉、玉米淀粉和多孔玉米淀粉上的吸附脱硫。通过扫描电子显微镜、表面酸度测量和具有衰减全反射的红外光谱对吸附剂进行表征。结果表明两种硫分子在两种香蕉淀粉上的吸附值都很低,这是由于它们的结构中没有空腔或孔。在玉米淀粉的情况下,空穴或孔的存在允许对噻吩和 4,6-二甲基二苯并噻吩有更大的吸附能力。硫化分子与淀粉之间的相互作用机制可以通过硫的自由电子对或芳环的 π 电子云与淀粉的布朗斯台德酸位点发生。应用于玉米淀粉的酶促改性允许获得具有更多空腔或孔的材料,但保持它们的结构和物理化学特性。与天然淀粉相比,较大尺寸的孔的存在允许吸附更大量的硫化分子。

更新日期:2021-09-20
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