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Abstract：
Converting Sargassum horneri (SH)-a harmful marine stranding that can cause golden tide-to highly porous bio-adsorbent material (via one-step catalytic oxidative pyrolysis with K2FeO4) can be a strategically useful method for obtaining low-cost materials suitable for CO2 capture. In this manuscript, the behavior of different mass ratios of K2FeO4/SH precursor acting on the surface physicochemical properties of carbon materials are reported. The results suggest that specific surface area and total pore volume first increased to the mass ratio of K2FeO4/carbon precursor, then decreased. Among the samples prepared, the highest specific surface area was obtained with a K2FeO4/SH precursor ratio of 1:4 (25%-ASHC), and the CO2 adsorption performance was significantly increased and faster compared with the original biochar. The fitted values of the three kinetic models showed that the double exponential model provided the best description of carbon adsorption, indicating both physical and chemical adsorption; 25%-ASHC also exhibited excellent cyclic stability. The improved CO2 adsorption performance observed after K2FeO4 activation is mainly due to the increase in material porosity, specific surface area, and the enrichment of nitrogen and oxygen functional groups.
摘要：
将Sargassumhorneri（SH）-一种有害的海洋搁浅物转化为高度多孔的生物吸附剂材料（通过使用K2FeO4的一步催化氧化热解）可以是一种战略上有用的方法，用于获得适用于CO2捕获的低成本材料。在这份手稿中,报道了不同质量比的K2FeO4/SH前驱体对碳材料表面理化性质的影响。结果表明，比表面积和总孔体积首先增加到K2FeO4/碳前驱体的质量比，然后减少。在准备的样品中，最高的比表面积是在K2FeO4/SH前体比例为1:4(25%-ASHC)时获得的，与原生物炭相比,CO2吸附性能显著提高且更快。三个动力学模型的拟合值表明，双指数模型提供了最好的碳吸附描述，表明物理和化学吸附;25％-ASHC也表现出优异的循环稳定性。K2FeO4活化后观察到的CO2吸附性能的改善主要是由于材料孔隙率的增加，比表面积,以及氮和氧官能团的富集。
