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Novel nanostructured carbons derived from epoxy resin and their adsorption characteristics for CO2 capture

机译：来自环氧树脂的新型纳米结构碳及其CO2捕获的吸附特性

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In this work, a nanocasting technique has been used to synthesize oxygen enriched carbon adsorbents with epoxy resin as the precursor and mesoporous zeolite as a template. Carbonization and physical activation with CO _(2) was carried out to prepare different carbon adsorbents. Characterization of the synthesized adsorbents was done using N _(2) sorption, XRD, SEM, TEM, TGA, FTIR spectroscopy, CHN analysis, and XPS. The surface area and pore volume of the synthesized adsorbent prepared at 600 °C were found to be a maximum of 686.37 m ~(2) g ~(?1) and 0.60 cm ~(3) g ~(?1) , respectively, but showed a lower adsorption capacity due to lesser oxygen content as compared to the sample prepared at 700 °C. The sample prepared at 700 °C exhibited the highest CO _(2) uptake, approximately 0.65 mmol g ~(?1) , at 30 °C due to the high oxygen content, which was estimated to be about 53.98% determined using CHN analysis and also due to high surface basicity confirmed by XPS. The sample prepared by direct carbonization of the polymeric precursor shows a completely non-porous and highly acidic material having the least adsorption capacity. It was found that an increase in concentration of CO _(2) increases adsorption capacity and an increase in adsorption temperature decreases adsorption capacity. CO _(2) adsorption kinetics were performed by using three kinetic models and from the correlation coefficient, adsorption kinetics were found to obey fractional order with error% within the range of 4.24%. For checking the regenerability, four adsorption–desorption cycles were examined. It was found that the adsorbents exhibit easy regenerability, stable adsorption capacity and good selectivity for CO _(2) –N _(2) separation. The experimental data are well fitted with the Freundlich isotherm, showing a heterogeneous adsorbent surface. The isosteric heat Q _(st) of CO _(2) is 9.09 kJ mol ~(?1) , which indicates the presence of the physisorption process. The negative value of Gibbs free energy suggests the spontaneous nature of the process. The values of Δ H ° and Δ S ° were found to be ?2.562 kJ mol ~(?1) and 0.033 kJ mol ~(?1) K ~(?1) , respectively. The negative value of Δ H ° suggests the exothermic nature of the adsorption process.
机译：在这项工作中，已用于将富含氧碳吸附剂与环氧树脂合成作为前体和中孔沸石作为模板的氧化碳吸附剂。进行碳化和用CO _（2）的物理活化以制备不同的碳吸附剂。合成吸附剂的表征使用N _（2）吸附，XRD，SEM，TEM，TGA，FTIR光谱，CHN分析和XPS进行。在600℃下制备的合成吸附剂的表面积和孔体积分别为600℃的最大值，分别为686.37m〜（2）g〜（α1）和0.60cm〜（3）g〜（？1）但与在700℃下制备的样品相比，由于氧含量较小，因此显示出较低的吸附容量。在700℃下制备的样品表现出最高的Co _（2）摄取，由于高氧含量，在30℃下，约0.65mmol G〜（α1），估计使用CHN分析测定约53.98％还有由于XPS证实的高表面碱度。通过聚合物前体的直接碳化制备的样品显示出具有最小吸附能力的完全无孔和高度酸性的材料。结果发现，CO _（2）的浓度增加会增加吸附能力，吸附温度的增加降低了吸附能力。 CO _（2）通过使用三种动力学模型和相关系数进行吸附动力学，发现吸附动力学在4.24％范围内误差偏移。为了检查再生性，检查了四个吸附解吸循环。发现吸附剂表现出易再生性，稳定的吸附能力和CO _（2）-N _（2）分离的良好选择性。实验数据配有Freundlich等温线，显示出异构吸附表面。 CO _（2）的基位热Q _（ST）为9.09 kJ mol〜（α1），表明存在物理学过程。 Gibbs自由能量的负值表明该过程的自发性。发现δH°和δS°的值是α2.562kjmol〜（α1）和0.033kj mol〜（α1）k〜（α1）。 δH°的负值表明吸附过程的放热性质。

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