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首页> 外文期刊>RSC Advances >Hydrothermal synthesis and microwave-assisted activation of starch-derived carbons as an effective adsorbent for naphthalene removal
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Hydrothermal synthesis and microwave-assisted activation of starch-derived carbons as an effective adsorbent for naphthalene removal

机译：水热合成和微波辅助活化淀粉衍生碳作为脱萘的有效吸附剂

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In this work, starch-derived spherical carbon (HC) was prepared by hydrothermal carbonization and further activated with microwave assistance to obtain the target activated carbon (HMAC). The samples were characterized by methods of N _(2) adsorption–desorption, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, elemental analysis and scanning electron microscopy. Moreover, HMAC has a high BET surface area of 616.8 m ~(2) g ~(?1) . The effects of initial naphthalene concentration, contact time, temperature, and pH of the naphthalene adsorbed on HC and HMAC were investigated systematically. The HMAC exhibits higher capability for naphthalene removal than HC, and the equilibrium adsorption quantity of HMAC was 223.03 mg g ~(?1) at 303 K. The kinetic data revealed that the equilibrium time for naphthalene adsorption on samples was achieved at 40 min. The adsorption process of HC and HMAC for naphthalene both followed the pseudo-second-order kinetic and Freundlich isotherm models. Additionally, H-bond and π–π interactions were proposed to be involved in the adsorption process. An increasing adsorption amount of naphthalene onto HC and HMAC was observed when the pH value varied from 2 to 10. The HMAC can be successfully regenerated and maintained sorption performance after three cycles. This study revealed that HMAC obtained by hydrothermal synthesis combined with microwave-assisted activation has a promising application in the field of naphthalene removal.
机译：在这项工作中，通过水热碳化制备了淀粉衍生的球形碳（HC），并在微波辅助下进一步活化以获得目标活性炭（HMAC）。通过N _（2）吸附-解吸，Brunauer-Emmett-Teller分析，傅立叶变换红外光谱，X射线光电子能谱，元素分析和扫描电子显微镜等方法对样品进行了表征。此外，HMAC具有616.8m 2（2 g）（-1）的高BET表面积。系统研究了初始萘浓度，接触时间，温度和pH值对萘吸附在HC和HMAC上的影响。 HMAC具有比HC高的萘去除能力，在303 K下HMAC的平衡吸附量为223.03 mg g〜（？1）。动力学数据表明，萘在样品上的吸附平衡时间达到40 min。 HC和HMAC对萘的吸附过程均遵循拟二级动力学和Freundlich等温模型。此外，提出了H键和π-π相互作用参与吸附过程。当pH值从2变为10时，观察到萘在HC和HMAC上的吸附量增加。在三个循环后，HMAC可以成功再生并保持吸附性能。这项研究表明，通过水热合成与微波辅助活化相结合获得的HMAC在萘去除领域具有广阔的应用前景。

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