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首页> 外文期刊>Adsorption Science & Technology >Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
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Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration

机译：用含氧官能团的制备活性炭对水溶液吸附刚果红染料及其再生

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摘要

This study investigates the potential use of activated carbon prepared from coffee waste (CW) as an adsorbent for the removal of congo red dye from aqueous solution. The oxygen-containing groups of activated carbon prepared from CW play an important role in dyes ions adsorption onto activated carbon prepared from CW. The activated carbon is characterized by scanning electron microscopy and Fourier transform infrared (FTIR) spectroscopy. Adsorption experiments were carried out as batch studies at different contact time, pH, and initial dye concentration. The dye adsorption equilibrium was attained after 120 min of contact time. Removal of dye in acidic solutions was better than in basic solutions. The adsorption of dye increased with increasing initial dye concentration. The equilibrium data were revealed that Langmuir model was more suitable to describe the congo red adsorption and demonstrated excellent reusability potential with desorption greater than 90% throughout six consecutive adsorption-desorption cycles. Experimental data founded that kinetics followed a pseudo-second-order equation. Thermodynamic study showed that the adsorption was a spontaneous and exothermic process. According to the FTIR analyses, hydrogen bonding and electrostatic interactions between dyes and oxygen-containing functional groups on activated carbon prepared from CW are dominant mechanisms for dye adsorption.
机译：本研究调查了从咖啡废物（CW）中制备的活性炭作为吸附剂，用于从水溶液中除去刚果红染料的吸附剂。由CW制备的含氧的活性炭基团在染料离子吸附到由CW制备的活性炭中发挥着重要作用。活性炭的特征在于扫描电子显微镜和傅里叶变换红外（FTIR）光谱。在不同接触时间，pH和初始染料浓度下进行吸附实验。在120分钟的接触时间后达到染料吸附平衡。在酸性溶液中去除染料优于碱性溶液。随着初始染料浓度的增加，染料的吸附增加。均衡数据显示，朗美模型更适合于描述刚果红色吸附，并在整个六个连续的吸附 - 解吸循环中展示了解吸的优异可重用能力潜力大于90％。实验数据创立了动力学遵循伪二阶方程。热力学研究表明，吸附是自发性和放热过程。根据FTIR分析，由CW制备的活性炭对染料和含氧的官能团之间的氢键和静电相互作用是染料吸附的主要机理。

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