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Synthesis, characterization and adsorption properties of sewage sludge derived biochar modified with eggshell

机译：蛋壳改性污泥衍生生物炭的合成，表征与吸附性能

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Sewage sludge-derived biochar (SDB) in recent times has increasingly been applied in the decontamination of effluents from households and industries due to its adsorptive properties. The SDB adsorbent is composed of a highly porous structure, and it contains multiple functional groups and exchangeable cations. However, it has been reported that the SDB texture could be improved to obtain large amounts of adsorption sites. In this work, the SDB material was treated using eggshell to obtain a novel adsorbent, namely eggshell-modified sludge-derived biochar (EMBC). The EMBC composite was characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and X-Ray diffraction (XRD) spectroscopy. It was demonstrated that the Brunauer-Emmett-Teller (BET) surface area and pore-distribution properties of EMBC were enhanced compared to the unmodified SDB. Moreover, the chemical composition of EMBC was strongly associated with the proliferation of carbonate minerals, amine, and oxygen-containing functional groups such as C-O, C=O, - OH, and -COOH. EMBC was highly porous, containing rough surface and significant amounts of vacant sites. The Barrett-Joyner-Halenda model revealed that the pore sizes of EMBC were well distributed. Based on the results mentioned above, EMBC could be employed as a promising, low-cost, and alternative adsorbent material for the elimination of various pollutants from aqueous solutions; and that will be the focus of our future works.
机译：近年来，源自污泥的生物炭（SDB）由于具有吸附特性，已越来越多地用于家庭和工业废水的净化。 SDB吸附剂由高度多孔的结构组成，并且包含多个官能团和可交换的阳离子。但是，据报道，可以改善SDB的质地以获得大量的吸附位点。在这项工作中，使用蛋壳处理SDB材料以获得一种新型吸附剂，即蛋壳改性的污泥衍生生物炭（EMBC）。 EMBC复合材料的特征在于扫描电子显微镜（SEM），傅立叶变换红外（FTIR）光谱和X射线衍射（XRD）光谱。结果表明，与未修饰的SDB相比，EMBC的Brunauer-Emmett-Teller（BET）表面积和孔分布特性得到了增强。此外，EMBC的化学成分与碳酸盐矿物，胺和含氧官能团（例如C-O，C = O，-OH和-COOH）的扩散密切相关。 EMBC是高度多孔的，包含粗糙的表面和大量的空位。 Barrett-Joyner-Halenda模型显示EMBC的孔径分布均匀。基于上述结果，EMBC可作为一种有前途的，低成本的替代吸附材料，用于消除水溶液中的各种污染物。这将是我们未来工作的重点。

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