School of Chemical and Metallurgical Engineering, The University of the Witwatersrand, 1 Jan Smuts Avenue & Jorrissen Street, Johannesburg, 2050, South Africa.
Manchester Metropolitan University, Manchester, UK.
Environ Geochem Health. 2021 Jul;43(7):2539-2550. doi: 10.1007/s10653-020-00567-6. Epub 2020 May 11.
The removal of methyl orange using coal fly ash, which is a widely available low-cost adsorbent, has been investigated. Adsorption studies for dye removal were conducted using various configurations such as batch, column and heap adsorption at various temperatures and adsorbent dosages at neutral pH. The Langmuir, Freundlich and Tempkin isotherm models were used to describe the process. The Freundlich model best represented the adsorption. Kinetic studies show the adsorption followed pseudo-second-order kinetics. Thermodynamic studies show that the process is spontaneous, endothermic and random. Column configuration was found to be the most efficient with a dye removal percentage of 99.95%, followed by heap adsorption at 99.25% removal and lastly batch configuration with 96.68% removal. Economic analysis shows that column operation would be the most effective for practical implementation.
使用广泛可用的低成本吸附剂粉煤灰去除甲基橙已被研究。在中性 pH 值下，使用各种配置（如分批、柱和堆吸附）和不同温度及吸附剂剂量进行了染料去除吸附研究。使用 Langmuir、Freundlich 和 Tempkin 等温模型来描述该过程。Freundlich 模型最能代表吸附。动力学研究表明吸附遵循准二级动力学。热力学研究表明该过程是自发的、吸热的和随机的。发现柱配置的效率最高，染料去除率为 99.95%，其次是堆吸附，去除率为 99.25%，最后是分批配置，去除率为 96.68%。经济分析表明，对于实际应用，柱操作将是最有效的。
