Evaluation of Ordered Mesoporous Carbon as a Robust and Efficient Adsorbent for the Removal of Metanil Yellow from Aqueous Solutions
Year: 2026
Type: article
Abstract: Metanil Yellow (MY), a highly toxic azo dye used in food products, was removed from aqueous solution using a metal- and halide-free ordered mesoporous carbon (OMC) adsorbent. MY exhibited a strong affinity towards OMC in batch as well as column operations, and OMC performed much better than previously reported adsorbents. The pH, dye concentration, adsorbent dosage, and contact time were optimised, and detailed adsorption experiments were performed under these conditions. Several isotherm models were fitted to the adsorption data, showing that the Langmuir and the Freundlich adsorption models were followed. Adsorption was spontaneous and endothermic at all measurement temperatures. On the basis of pH studies, enthalpy data, and adsorption isotherm analysis, adsorption was determined to be by physisorption. In kinetics studies, the adsorption process was found to be pseudo-second order with interparticle diffusion as the rate-limiting step. Column experiments using a fixed bed of OMC resulted in almost 100% column efficiency and a fractional column capacity of 0.999. During adsorption/desorption cycles of the exhausted column, 99.71% of the dye was recovered after the first cycle and 97.66% after the eleventh. These findings indicate that OMC is a promising and efficient material for the adsorptive removal of toxic MY dye.
Source: C – Journal of Carbon Research
DOI: 10.3390/c12020036
Authors: Bharti Gaur, Jyoti Mittal, Hadi Hassan, Alok Mittal, Richard Thornton Baker
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,930
Funders: Maulana Azad National Institute of Technology, University of St Andrews, Ministry of Education, India, Higher Education Commission, Pakistan, Scheme for Promotion of Academic and Research Collaboration, Engineering and Physical Sciences Research Council, Division of Human Resource Development
Awards: G1352154937, G2225887160, G3619197477, The University of St Andrews - Equipment Account, G5877670090, G6788687432, G6996773814, Electron Microscopy for the Characterisation and Manipulation of Advanced Functional Materials and their Interfaces at the Nanoscale, Light Element Analysis Facility - LEAF
OpenAlex ID: W7155566408