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Synthesis of activated carbon/polyaniline nanocomposites for enhanced CO2 adsorption

机译：增强CO2吸附活性炭/聚苯胺纳米复合材料的合成

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Nanostructured polyaniline and its composites with pine cone-based activated carbon were synthesized by the oxidative polymerization of aniline in an aqueous solution of sulfuric acid and in the presence and absence of appropriate surfactant. The prepared activated carbon (AC), AC/polyaniline nanofiber composite (AC–PANI-F) and AC/polyaniline nanosphere composites (AC–PANI-S) were characterized by an N _(2) adsorption isotherm at 77 K, elemental analysis, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and acid–base Boehm titration. The equilibrium adsorption of CO _(2) on AC and nanocomposites were experimentally investigated via a volumetric technique at a temperature range of 298–318 K and pressures up to 16 bar. The CO _(2) adsorption capacity was remarkably increased from 1.91 mmol g ~(?1) for AC to 2.69 mmol g ~(?1) for AC–PANI-F and 3.16 mmol g ~(?1) for AC–PANI-S at 25 °C and 1 bar. The Sips isotherm presented a perfect fit to the CO _(2) adsorption data on adsorbents. The relatively fast kinetic adsorption of CO _(2) on the nanocomposites reflected the presence of more easily accessible adsorption sites toward CO _(2) for nanocomposites than AC. The isosteric heat of adsorption at relatively low adsorbate coverage was 55 kJ mol ~(?1) for AC–PANI-F and 52 kJ mol ~(?1) for AC–PANI-S, indicating the physico-chemical characteristics and heterogeneity of the adsorbents surface. The selectivity of CO _(2) over N _(2) by AC, AC–PANI-F and AC–PANI-S (CO _(2) ?:?N _(2) = 15?:?85, 298 K, 1 bar), predicted by the ideal adsorbed solution theory (IAST) model, achieved 1.53, 18.97 and 6.1, respectively. The results indicate that activated carbon/PANI nanocomposites can be used as an effective adsorbent for capture of CO _(2) from flue gas.
机译：通过硫酸水溶液中的苯胺和存在和不存在适当的表面活性剂，通过苯胺的氧化聚合合成纳米结构聚苯胺及其基于杉木的活性炭的复合材料。制备的活性炭（AC），AC /聚苯胺纳米纤维复合物（AC-PANI-F）和AC /聚苯胺纳米纳米复合材料（AC-PANI-S）的特征在于77K，元素分析，N _（2）吸附等温线，热重试验分析（TGA），傅里叶变换红外光谱（FT-IR），X射线衍射（XRD），扫描电子显微镜（SEM）和酸基梁滴定。通过体积的技术在298-318k的温度范围内通过体积化技术进行实验研究CO _（2）对AC和纳米复合材料的平衡吸附，并压低至多16巴。对于AC-PANI-F和3.16mmol G〜（α1），CO _（2）吸附容量显着增加到AC至2.69mmol G〜（α1）。 - 在25°C和1巴。啜饮等温线呈现在吸附剂上的CO _（2）吸附数据上完美拟合。纳米复合材料上的CO _（2）的相对快速的动力学吸附反映了纳米复合材料的纳米复合材料的更容易可获得的吸附位点，而不是AC。对于AC-PANI-F和52kJ摩尔〜（α1），对AC-PANI-S的ac-PANI-S，吸附以55kJ摩尔〜（α1）的吸附是55kJ摩尔〜（α1），表明物理化学特性和异质性吸附剂表面。通过AC，AC-PANI-F和AC-PANI-S（CO _（2）（CO _（2）？：？n _（2）= 15？：？85,298，选择性CO _（2） K，1 BAR），由理想的吸附解决方案理论（IAST）模型预测，分别实现1.53,18.97和6.1。结果表明，活性炭/胰纳米复合材料可用作来自烟道气捕获Co _（2）的有效吸附剂。

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