Pillared graphene oxide composite as an adsorbent of soluble hydrocarbons in water: pH and organic matter effects.,Journal of Environmental Management

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Pillared graphene oxide composite as an adsorbent of soluble hydrocarbons in water: pH and organic matter effects.
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.jenvman.2019.110044
C E Flores-Chaparro ₁ , C J Castilho ₂ , I Külaots ₂ , Robert H Hurt ₂ , J R Rangel-Mendez ₁

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Graphene oxide (GO) is a single-atom-thick sheet of carbon with oxygen-containing functional groups decorating its basal plane and edge sites. Most of its high surface area can be lost due to restacking of individual layers during the synthesis and drying of GO-based bulk sorbents. There is great interest to increase the specific surface area of graphene-based sorbents by introducing organic molecules as "pillaring agents" between GO sheets to hinder the stacking process and create sorbents with elevated surface area. This work synthesizes pillared GO by introducing chitosan (CS), a linear polysaccharide with various molecular weights. A composite of low molecular weight CS at a CS/GO ratio of 0.1 is shown to have the highest specific surface area (up to 70.5 m2/g) in comparison to the medium and high CS molecular weight, pristine GO, and the CS/GO composite materials. The affinity of the optimized GO/CS composites towards benzene, toluene, and naphthalene was evaluated at 19.3 mg/L of organic matter content while altering pH. Sips and Langmuir adsorption isotherm models well described the adsorption behavior, and benzene adsorption performance was reduced at low pH. Related to the presence of dissolved organic matter (DOM) in solution, lower diffusivity constants (k1) in hydrocarbon systems were recorded. Our results demonstrate the feasibility of CS as a potential pillaring agent in CS/GO composites to increase specific surface area and enhance the capture of soluble hydrocarbons from aqueous solutions.

中文翻译：

柱状氧化石墨烯复合物作为水中可溶性碳氢化合物的吸附剂：pH和有机物的影响。

氧化石墨烯（GO）是单原子厚的碳片，带有含氧的官能团修饰其基面和边缘部位。由于在GO型本体吸附剂的合成和干燥过程中各个层的重新堆积，其大部分高表面积可能会丢失。通过在GO片之间引入有机分子作为“起毛剂”以阻碍堆积过程并产生表面积增加的吸附剂，从而增加基于石墨烯的吸附剂的比表面积引起了极大的兴趣。这项工作通过引入壳聚糖（CS）（一种具有各种分子量的线性多糖）来合成柱状GO。与中高CS分子量的原始GO相比，CS / GO比为0.1的低分子量CS的复合材料具有最高的比表面积（最高70.5 m2 / g）。以及CS / GO复合材料。在改变pH值的同时，以19.3 mg / L的有机物含量评估了优化的GO / CS复合材料对苯，甲苯和萘的亲和力。Sips和Langmuir吸附等温线模型很好地描述了吸附行为，并且在低pH下苯吸附性能降低。与溶液中溶解有机物（DOM）的存在有关，记录了碳氢化合物系统中较低的扩散常数（k1）。我们的结果证明了CS作为CS / GO复合材料中潜在的支柱剂以增加比表面积并增强从水溶液中捕获可溶性烃的可行性。改变pH值时，有机物含量为3 mg / L。Sips和Langmuir吸附等温线模型很好地描述了吸附行为，并且在低pH下苯吸附性能降低。与溶液中溶解有机物（DOM）的存在有关，记录了碳氢化合物系统中较低的扩散常数（k1）。我们的结果证明了CS作为CS / GO复合材料中潜在的支柱剂以增加比表面积并增强从水溶液中捕获可溶性烃的可行性。改变pH值时，有机物含量为3 mg / L。Sips和Langmuir吸附等温线模型很好地描述了吸附行为，并且在低pH下苯吸附性能降低。与溶液中溶解有机物（DOM）的存在有关，记录了碳氢化合物系统中较低的扩散常数（k1）。我们的结果证明了CS作为CS / GO复合材料中潜在的支柱剂以增加比表面积并增强从水溶液中捕获可溶性烃的可行性。

更新日期：2020-01-09

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